CN114323392B - Probe, probe assembly, measuring device and measuring method for detonation test - Google Patents

Abstract

The invention discloses a probe, a probe assembly, a measuring device and a measuring method for detonation testing, and belongs to the technical field of optical fiber sensing measurement. The probe comprises a probe body and a metal film arranged at one end of the probe body, wherein the metal film is a coated film and is an aluminum film. The probe assembly, the measuring device and the measuring method are all realized on the basis of a probe. By adopting the technical scheme provided by the scheme, the test precision can be effectively improved.

Description

Probe, probe assembly, measuring device and measuring method for detonation test

Technical Field

The invention relates to the technical field of optical fiber sensing measurement, in particular to a probe, a probe assembly, a measuring device and a measuring method for detonation testing.

Background

In the explosive shock test, in order to measure the detonation wave and the arrival time of the shock wave under extreme environment and special environmental conditions, a fiber probe is generally used for the test. The optical fiber probe works by means of laser, when the optical fiber probe receives detonation wave and shock wave signals, a step disturbing signal is transmitted from the testing end face of the optical fiber probe, the step disturbing signal is transmitted to testing instrument equipment through the optical fiber probe and tail fibers, the obtained signals are monitored by the instrument equipment and recorded in real time, and the detonation wave and shock wave signals can be recorded by the recording equipment. Due to the working particularity of the optical fiber probe, the optical fiber probe can be applied to signal measurement under the high-load condition in the fields of explosion and impact and has important practical value.

In the prior art, for example, in the technical scheme of the invention with application number CN201910897066.8 entitled as a multi-path time measuring device and method based on an optical fiber probe, a technical scheme is provided for achieving the purpose of testing by determining whether a metal film is damaged, and by determining whether a laser signal returns under the working condition of whether the metal film is damaged, and by recording time. In a specific technical scheme, the metal film is disclosed to be a plated film.

The structural design of the optical fiber probe is further optimized, and the measuring method using the optical fiber probe is further optimized, so that the related technology can have better reliability and testing precision in explosive detonation and shock wave propagation tests, and undoubtedly has positive significance on the development of the optical fiber sensing measuring technology.

Disclosure of Invention

Aiming at the technical problems that the structural design of the optical fiber probe is further optimized and the measurement method of the optical fiber probe is utilized, so that the related technology can have better reliability and test precision in explosive detonation and shock wave propagation tests, and has positive significance to the development of the optical fiber sensing measurement technology undoubtedly, the invention provides the probe, the probe component, the measurement device and the measurement method for the detonation test.

The purpose of the invention is mainly realized by the following technical scheme:

the probe for detonation test comprises a probe body and a metal film arranged at one end of the probe body, wherein the metal film is a coated film and is an aluminum film.

When the probe is used for detonation testing, the probe is an optical fiber probe, one end of the optical fiber probe, which is far away from the metal film, is connected with an optical fiber serving as a tail fiber, the other end of the tail fiber is connected with a laser light source and a laser light signal monitoring device, and the metal film is used for forming a resonant cavity, so that when the metal film is not damaged, the optical signal monitoring device can monitor an optical signal with stable signal amplitude under the input of the laser light source; when the metal film receives the high-intensity pressure of the detonation waves or the shock waves, the shock waves enter the probe, the metal film is damaged, and the resonant cavity is damaged, so that the metal film does not reflect light signals or generates step disturbance signals any more, at the moment, the optical signal monitoring device can obtain obvious step signals or pulse signals through conversion and recording of the signals, and the arrival moments of the detonation waves and the shock waves can be obtained through the step signals or the pulse signals.

The probe provided by the scheme can be used for obtaining the detonation wave and the shock wave arrival time, and when the probe is used specifically, one end provided with the metal film is used as a test end of the probe. In the specific structural design, the coating film is adopted as the metal film, the metal film which can completely seal the testing end can be reliably obtained by utilizing the existing coating process, so that after the metal film is damaged, the generated signal has the steep front characteristic, and meanwhile, the mirror reflection surface is obtained on the metal film, thereby finally being beneficial to the reliability and the testing precision of the test.

Furthermore, the plated film is set to be an aluminum film, and the forming temperature of the plated film of the aluminum film is relatively low, so that the influence of the process of forming the metal film on the probe body on the deformation of the probe body and the quality of the surface of the inner wall is reduced; secondly, the reflectivity of the aluminum film can reach 60% or above, the deformation influence of the formation of the aluminum film on the probe body and the reflectivity of the aluminum film can be achieved, so that the optical signal monitoring device can obtain clear observation signals, and finally the purpose of improving the testing precision is achieved.

Furthermore, because the metal film which is the aluminum film has better ductility, the material performance of the metal film is beneficial to keeping the integrity of the metal film in the process of applying positive pressure of the metal film on the surface of the measured object.

As a further technical scheme of the probe for the detonation test:

when the method is used specifically, the existing coating process is combined, the thickness of the coating can be measured by a micrometer, for example, the thickness is set to be 5-10 micrometers, for example, the metal film is attached to the surface of a measured object, when the test pressure threshold is about 0.4Mpa, the metal film can be damaged, in the conventional explosion, the pressure which can be monitored by adopting the method is usually in the GPa magnitude order, and therefore, in order to improve the test sensitivity, the scheme that the test end is contacted with the surface of the measured object is preferably adopted.

The existing coating process can well enable the metal film to completely block the testing end of the probe body, but when the testing end is used to be in contact with the surface of a tested object, the situation that the metal film is broken and a complete resonant cavity cannot be formed possibly occurs in the contact process of the metal film and the surface before the probe is not used due to the fact that the metal film is thin, and the situation is not easy to find or easily neglected after the situation occurs, so that the steep front edge characteristic of the signal provided above is influenced, and the testing precision is not favorably guaranteed. Aiming at the problems, the method comprises the following steps: the probe also comprises an end plug embedded in the pore of the probe body, the end plug is made of a light-transmitting material, and the metal film is formed on the end face of the probe body and the surface of the end plug. In the scheme, the end plug is used as a substrate for bearing the metal film on the probe, that is, the metal film can be formed on the probe through the end face of the probe body and the surface of the end plug, so that the possibility of cracking of the metal film can be effectively reduced by using the end plug as a back plate at the inner side of the metal film in the process of installing the probe, and the possibility of probe failure or performance reduction caused in the process of installing the probe is reduced. In specific implementation, the end plug can adopt quartz as an optical fiber material, the end plug is embedded in the end part of the probe body in an expansion joint mode, one end of the end plug, which is used for being attached to the metal film, is a mirror surface, and the whole end plug is positioned on the inner side of the probe body, so that the end plug can be fixed by utilizing the friction force between the end plug and the inner wall of the probe body, the metal film is prevented from being damaged due to the fact that the end plug moves relative to the probe body, meanwhile, a mirror surface reflection surface can be obtained on the aluminum film, the size of the testing end is reduced, and the integrity of the metal film is prevented from being influenced by external force as far as possible.

The scheme also discloses a probe assembly for detonation testing, which comprises a probe, wherein the probe is the probe. The probe assembly is a specific application of the probe.

As a further technical scheme of the probe assembly for detonation testing:

as described above, in order to reduce the energy requirement for the rupture of the metal film or improve the testing accuracy, it is preferable to adopt a mode that the metal film is in contact with the surface of the object to be tested, and in order to make the probe assembly have the function of being fixed, the probe assembly is configured as follows: the probe body is also provided with a connecting piece for realizing the fixed connection of the probe and the measured object;

the connecting piece satisfies: through the connecting piece, the probe can be connected to the measured object in a mode that the metal film is contacted with the surface of the measured object. As a person skilled in the art, the fixed connection can be realized by means of screw connection, welding, bonding, clamping, magnetic attraction, etc., and the connecting piece is a connecting piece which is matched with the probe assembly to complete the fixed connection.

Considering the use of probe subassembly under special environment, for avoiding accomplishing fixed connection back metallic membrane and measured object surface contact failure, for temperature and humidity change environment, vibrations/vibration environment, set up to: the connecting piece comprises an elastic piece and a pressing plate, one end of the elastic piece can act on the probe body, the pressing plate can act on the other end of the elastic piece, and the elastic piece can elastically deform in the length direction of the probe body;

in the length direction of the probe body, the elastic piece is positioned between the metal film and the pressing plate. In this scheme, in accomplishing the fixed connection in-process, through adopting the clamp plate is for the probe to accomplish fixed connection towards the motion of probe metallic membrane place end, can make the elastic component produce compression elastic deformation in the connection process, like this, when the clamp plate keeps away from for the measured object contact surface under various circumstances, through elastic component elastic recovery, can reach the condition of avoiding appearing the clearance between metallic membrane and the measured object surface. Meanwhile, when the pressing plate is fixed by adopting threaded connection, the elastic piece can be used as a connecting thread anti-loosening piece and a metal film stressed protecting piece, and the threaded connection failure and the steep stress increase of the metal film are avoided.

As a technical scheme capable of avoiding the local rupture of the edge of the metal film caused by the single-side compression of the metal film, the method is characterized in that: one end of the probe body, which is provided with the metal film, is a straight rod section;

the pressing plate is a connecting cap with external threads on the outer surface and a central hole on the inner side, the opening end of the connecting cap faces the metal film, and the connecting cap is sleeved on the straight rod section through a pore passage in the center of the end plate;

the elastic piece is a spiral spring sleeved on the straight rod section;

the probe also comprises a first baffle fixed on the straight rod section, and the spiral spring acts on the end surface of the first baffle through the end part and acts with the probe body;

one end, far away from the metal film, of the spiral spring is embedded into the central hole, and the outer diameter of the spiral spring and the aperture of the central hole meet the following requirements: the position of the helical spring relative to the axis of the straight rod section may be defined by the contact of the outer surface of the helical spring with the wall of the central bore. The technical scheme is that the pressing plate is in threaded connection with the object to be tested, when the probe is in specific use, the external thread and the straight rod section are preferably adopted to be coaxial, and the testing end is right opposite to the surface of the object to be tested (the straight tube section is arranged to be vertical to the surface of the object to be tested), so that when the connecting cap is rotated, the spiral spring can be compressed when the connecting cap moves towards the surface of the object to be tested along the axis of the straight tube section until the metal film is in contact with the surface and elastic energy is accumulated on the spiral spring, and the spiral spring is adopted to ensure that the resultant force of the spiral spring on the elasticity of the probe body is as far as possible along the axis of the straight rod section; the tunnel is provided in order to enable the connection cap to be positioned as centrally as possible with respect to the axis of the straight rod section, and the centered condition is defined by the interaction of the tunnel side walls with the outer wall of the straight rod section; the definition of the relationship between the outer diameter of the helical spring and the diameter of the central hole is intended to avoid the helical spring from sliding excessively with respect to the connecting cap in the radial direction of the connecting cap, if the outer diameter is set equal to the diameter, the above features are all used to realize: avoid the metal film unilateral atress too big. When concrete implementation, set up to first baffle for being fixed in on the probe body, the discoid structure at first baffle center is passed to the probe body to make along the circumferential direction of straight-bar section, coil spring all has the action point with first baffle. In order to reduce the influence of the coil spring on the weight of the probe assembly and ensure the reliability of the performance of the coil spring, 1Cr18Ni9Ti austenitic stainless steel material is adopted as the coil spring.

As the technicians in this field, if only considering that the probe can realize the surface contact of metal film and measured object under the effect of elasticity, only need set up first baffle, connect the cap can along the straight-bar section slides, set up the elastic component between first baffle and the connection cap can, for avoiding connecting the cap can along the connection cap that straight-bar section slides probably leads to is lost, makes the structural integrity that keeps that the probe subassembly can be fine sets up to: the probe also comprises a second baffle fixed on the probe body and used for limiting the position of a sliding stop point of the connecting cap on the straight rod section towards one side far away from the metal film. As a person skilled in the art, the coil spring and the connecting cap may be located between the first barrier and the second barrier, and the form of the second barrier may be configured to be identical to the form of the first barrier in the above-mentioned disc-shaped structure.

As described above, in the form of the coupling member using only the first shutter, the coil spring, and the coupling cap, when the coupling cap is rotated, a torque may be applied to the probe body by a frictional force, which may cause the metal film to be worn, which is detrimental to the integrity of the resonant cavity. To avoid this, the following settings are set: the probe structure further comprises a cross rod which is fixed on the side wall of the probe body and protrudes outwards relative to the side wall of the probe body, and the cross rod is located between the connecting piece and the metal film. This scheme is when specifically using, the horizontal pole can regard as operating personnel to the application of force part of probe body, if grip the horizontal pole, receives to cut through the horizontal pole and offset the torque avoids leading to the metallic film to rotate in step with the probe body under the effect of connecting the cap. Preferably, set up to the in-process of connecting cap compression coil spring in the rotation, through the horizontal pole, pass the probe body to one side that the cap place is connected to the side direction for the whole in-process metallic film that connects the cap in the rotation all should not the surface of testee contact, and the feed volume of connecting the cap satisfies: after the restraint on the crossbar is removed, the metal film can be brought into contact with the surface and the coil spring is in a compressed state. Like this, after the connection cap is rotatory to the position, under the external force that the user exerted on the probe body, can realize to the metallic film with the impact force on surface is controllable, like this, can effectively ensure the integrity of metallic film. When the optical fiber probe is implemented specifically, on the basis of a traditional optical fiber probe structure (polished rod), in order to avoid the influence on the shape of the probe caused by the installation of the cross rod and the quality of the inner wall of the probe caused by the introduction of welding heat, the optical fiber probe is set as a lantern ring which is also sleeved and fixed on the probe body, and the cross rod is fixed on the outer wall of the lantern ring. Like this, can accomplish the fixed of horizontal pole and lantern ring in the outside of probe body, then, through bonding, can accomplish being connected of horizontal pole and probe body. The concrete position of setting up of horizontal pole can be in probe body length direction's optional position, and the setting of injecing in this scheme is being located between connecting piece and the metallic film, aims at making the distance of horizontal pole and metallic film closer to realize: when the probe body is restrained by the cross rod, a relatively stable protection effect is obtained due to the fact that the force arm is short. When the probe body is arranged on the probe body and is arranged at the end, connected with the optical fiber, of the probe body, the probe body is exposed relative to the connecting piece, and therefore the probe has the best operation convenience.

The scheme also discloses a measuring device for detonation test, which comprises a probe, wherein the probe is the probe as described in any one of the above items;

one end of the probe body is provided with a metal film, and the other end of the probe body is connected with a light source and an optical signal monitoring device through optical fibers. The scheme is a measuring device comprising the probe. The light source is used for inputting the light source to the probe assembly, and the optical signal monitoring device is used for monitoring optical feedback monitoring. In specific implementation, in order to facilitate signal intensity, the optical fiber core of the optical fiber and the inner wall surface of the probe body are preferably in smooth transition.

The scheme also discloses a measuring method for detonation testing, which adopts the probe, and the metal film on the probe is contacted with the surface of the measured object. As mentioned above, the method is a measuring method which adopts the probe to realize detonation test, has high test sensitivity and low requirement on energy.

In conclusion, compared with the prior art, the invention has the following beneficial effects:

in the probe, the probe assembly, the measuring device and the measuring method provided by the scheme, the specific design of the probe is taken as a structural foundation.

In the specific structural design of the probe, the coating film is adopted as the metal film, the existing coating process can be utilized, the metal film which can completely block the testing end can be reliably obtained, the generated signal has the steep front characteristic after the metal film is damaged, and meanwhile, the mirror reflection surface is obtained on the metal film, so that the reliability and the testing precision of the test are finally facilitated.

Furthermore, the plated film is set to be an aluminum film, and the forming temperature of the plated film of the aluminum film is relatively low, so that the influence of the process of forming the metal film on the probe body on the deformation of the probe body and the quality of the surface of the inner wall is reduced; secondly, the reflectivity of the aluminum film can reach 60% or above, the deformation influence of the formation of the aluminum film on the probe body and the reflectivity of the aluminum film can be achieved, so that the optical signal monitoring device can obtain clear observation signals, and finally the purpose of improving the testing precision is achieved.

Furthermore, because the metal film which is the aluminum film has better ductility, the material performance of the metal film is beneficial to keeping the integrity of the metal film in the process of applying positive pressure of the metal film on the surface of the measured object.

By adopting the technical scheme provided by the scheme, the precision and the reliability of detonation testing can be effectively improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural diagram of one embodiment of a probe assembly for detonation testing according to the present invention, which is a schematic perspective structural diagram;

FIG. 2 is a schematic diagram of a structure of one embodiment of a probe assembly for detonation testing, according to the present invention, shown in cross-section;

FIG. 3 is a schematic structural view of an embodiment of a probe assembly for detonation testing according to the present invention, which is a schematic perspective view different from FIG. 1, the schematic structural view including a cross bar;

FIG. 4 is a cross-sectional view of a coupling cap in one embodiment of a probe assembly for detonation testing of the present invention.

The corresponding relation between the reference numerals and technical terms in the above schematic diagram is as follows: 1. the probe comprises a probe body, 2, a metal film, 3, a first baffle, 4, an elastic piece, 5, a connecting cap, 51, a central hole, 52, a pore passage, 6, an optical fiber, 7, an end plug, 8, a lantern ring, 9, a cross rod, 10 and a connecting piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1:

as shown in fig. 1 to 4, the probe for detonation testing includes a probe body 1 and ametal film 2 disposed at one end of the probe body 1, wherein themetal film 2 is a plated film and is an aluminum film.

When the probe is used for detonation testing, the probe is an optical fiber probe, one end of the optical fiber probe, which is far away from themetal film 2, is connected with anoptical fiber 6 serving as a tail fiber, the other end of the tail fiber is connected with a laser light source and a laser light signal monitoring device, and themetal film 2 is used for forming a resonant cavity, so that when themetal film 2 is not damaged, the light signal monitoring device can monitor a light signal with stable signal amplitude under the input of the laser light source; when themetal film 2 receives the high-intensity pressure of the detonation waves or the shock waves, the shock waves enter the probe, themetal film 2 is damaged, and the resonant cavity is damaged, so that themetal film 2 does not reflect light signals or generate step disturbance signals any more, at the moment, the optical signal monitoring device can obtain obvious step signals or pulse signals through conversion and recording of the signals, and the arrival time of the detonation waves and the shock waves can be obtained through the step signals or the pulse signals.

The probe that this scheme provided can be used for obtaining detonation wave and shock wave arrival moment, and during the concrete use, the test end of being provided with the one end ofmetallic film 2 as the probe. In the specific structural design, the coating film is adopted as themetal film 2, themetal film 2 which can completely block the test end can be reliably obtained by utilizing the existing coating process, so that after themetal film 2 is damaged, the generated signal has a steep front edge characteristic, and meanwhile, a specular reflection surface is obtained on themetal film 2, and finally, the reliability and the test precision of the test are facilitated.

Furthermore, the plated film is set to be an aluminum film, and firstly, the forming temperature of the plated film of the aluminum film is relatively low, so that the influence of the process of forming themetal film 2 on the probe body 1 on the deformation of the probe body 1 and the quality of the inner wall surface is reduced; secondly, the reflectivity of the aluminum film can reach 60% or above, the deformation influence of the formation of the aluminum film on the probe body 1 and the reflectivity of the aluminum film can be achieved, so that the optical signal monitoring device can obtain clear observation signals, and finally the purpose of improving the testing precision is achieved.

Further, since themetal film 2 is an aluminum film and has good ductility, the material properties of themetal film 2 are favorable for maintaining the integrity of themetal film 2 in the process of applying positive pressure of themetal film 2 on the surface of the object to be measured.

Example 2:

this example was further optimized and refined on the basis of example 1:

when the method is used specifically, the existing coating process is combined, the thickness of the coating can be measured by a micrometer, for example, the thickness is set to be 5-10 micrometers, for example, themetal film 2 is attached to the surface of a measured object, when the test pressure threshold is about 0.4Mpa, themetal film 2 can be damaged, in the conventional explosion, the pressure which can be monitored by the method is usually in the GPa magnitude, and therefore, in order to improve the test sensitivity, the scheme that the test end is in contact with the surface of the measured object is preferably adopted.

The existing coating process can well enable themetal film 2 to completely block the testing end of the probe body 1, but when the testing end is used to be in contact with the surface of a tested object, themetal film 2 is thin, the contact process of themetal film 2 and the surface can cause the situation that themetal film 2 is broken and a complete resonant cavity cannot be formed before the probe is not used, and the situation is not easy to find or neglect after the situation occurs, so that the steep front edge characteristic of the signal provided above can be influenced, and the testing precision is not favorably ensured. Aiming at the problems, the method comprises the following steps: the probe structure further comprises anend plug 7 embedded in thehole 52 of the probe body 1, wherein theend plug 7 is made of a light-transmitting material, and themetal film 2 is formed on the end face of the probe body 1 and the surface of theend plug 7. In the scheme, theend plug 7 is used as a substrate for bearing themetal film 2 on the probe, that is, themetal film 2 can be formed on the probe through the end face of the probe body 1 and the surface of theend plug 7, so that the possibility of cracking of themetal film 2 can be effectively reduced by using theend plug 7 as a back plate on the inner side of themetal film 2 in the process of installing the probe, and the possibility of probe failure or performance reduction caused in the process of installing the probe is reduced. In specific implementation, theend plug 7 may be made of quartz as a material of theoptical fiber 6, theend plug 7 is embedded in an end portion of the probe body 1 in an expansion manner, an end of theend plug 7, which is used for being attached to themetal film 2, is a mirror surface, and theend plug 7 is integrally located inside the probe body 1, so that theend plug 7 can be fixed by using a friction force between theend plug 7 and an inner wall of the probe body 1, thereby avoiding themetal film 2 from being damaged due to movement of theend plug 7 relative to the probe body 1, and meanwhile, a mirror reflection surface can be obtained on the aluminum film, the size of the testing end can be reduced, and the integrity of themetal film 2 is prevented from being influenced by an external force as much as possible.

Example 3:

this embodiment provides a probe assembly for detonation testing based on embodiment 1, which includes a probe, where the probe is the probe described in embodiment 1. The probe assembly is a specific application of the probe.

Example 4:

this example was further optimized and refined on the basis of example 3:

as described above, in order to reduce the energy requirement for the rupture of themetal film 2 or improve the testing accuracy, it is preferable to adopt a mode that themetal film 2 contacts with the surface of the object to be tested, and in order to make the probe assembly have the function of being fixed, the probe assembly is configured as follows: the probe body 1 is also provided with a connectingpiece 10 for realizing the fixed connection of the probe and a measured object;

the connectingpiece 10 satisfies: through theconnector 10, the probe can be connected to a measured object in a manner that themetal film 2 is in contact with the surface of the measured object. As a person skilled in the art, the fixed connection can be realized by means of screw connection, welding, bonding, clamping, magnetic attraction, etc., and the connectingelement 10 is the connectingelement 10 which is matched with the probe assembly to complete the fixed connection.

Example 5:

this example was further optimized and refined on the basis of example 4:

considering the use of the probe assembly in special environments, such as temperature and humidity change environment and vibration/vibration environment, in order to avoid the contact failure of themetal film 2 and the surface of the measured object after the fixed connection is completed, the probe assembly is set as follows: the connectingpiece 10 comprises an elastic piece 4 and a pressing plate, one end of the elastic piece 4 can act on the probe body 1, the pressing plate can act on the other end of the elastic piece 4, and the elastic piece 4 can elastically deform in the length direction of the probe body 1;

in the length direction of the probe body 1, the elastic member 4 is located between themetal film 2 and the pressing plate. In this scheme, in accomplishing the fixed connection in-process, through adopting the clamp plate is for the probe to accomplish fixed connection towards the end motion of probemetallic membrane 2 place, can be so that connecting process in elastic component 4 produces compression elastic deformation, like this, when the clamp plate keeps away from for the measured object contact surface under various circumstances, through the elastic component 4 elastic recovery, can reach the condition of avoiding appearing the clearance betweenmetallic membrane 2 and the measured object surface. Meanwhile, by adopting the scheme, if the pressing plate is fixed by adopting threaded connection, the elastic piece 4 can be used as a connecting thread anti-loosening piece and ametal film 2 stressed protecting piece, so that the failure of the threaded connection and the steep increase of the stress of themetal film 2 are avoided.

Example 6:

this example was further optimized and refined on the basis of example 5:

as a technical scheme capable of avoiding the local rupture of the edge of themetal film 2 caused by the single-side compression of themetal film 2, the method is provided with the following steps: one end of the probe body 1, which is provided with themetal film 2, is a straight rod section;

the pressing plate is a connectingcap 5, the outer surface of the pressing plate is provided with external threads, the inner side of the pressing plate is provided with acentral hole 51, the opening end of the connectingcap 5 faces themetal film 2, and the connectingcap 5 is sleeved on the straight rod section through apore passage 52 in the center of the end plate;

the elastic part 4 is a spiral spring sleeved on the straight rod section;

the probe also comprises afirst baffle 3 fixed on the straight rod section, and the spiral spring acts on the end surface of thefirst baffle 3 through the end part and acts with the probe body 1;

one end of the spiral spring, which is far away from themetal film 2, is embedded in thecentral hole 51, and the outer diameter of the spiral spring and the aperture of thecentral hole 51 meet the following requirements: the position of the coil spring relative to the axis of the straight rod section may be defined by the contact of the outer surface of the coil spring with the bore wall of thecentral bore 51. The scheme is a technical scheme of threaded connection of the pressing plate and the object to be tested, when the probe is specifically used, the external thread and the straight rod section are preferably adopted to be coaxial, and the testing end is right opposite to the surface of the object to be tested (the straight pipe section is arranged to be vertical to the surface of the object to be tested), so that when the connecting cap 5 is rotated, the spiral spring can be compressed in the process that the connecting cap 5 moves towards the surface of the object to be tested along the axis of the straight pipe section until the metal film 2 is in contact with the surface and elastic energy is accumulated on the spiral spring, and the spiral spring is adopted to ensure that the resultant force of the spiral spring on the elastic force of the probe body 1 is as far as possible along the axis of the straight rod section; the arrangement of said duct 52 is intended to enable the connection cap 5 to be positioned as centrally as possible with respect to the axis of the straight pole segment, and said centered condition is defined by the interaction of the side walls of the duct 52 with the outer walls of the straight pole segment; the definition of the relationship between the outer diameter of the helical spring and the diameter of the central hole 51 is intended to avoid excessive sliding of the helical spring relative to the connecting cap 5 in the radial direction of the connecting cap 5, if it is set so that said outer diameter is equal to said diameter, all of which are used to achieve: avoid the metal film 2 unilateral atress too big. When concrete implementation, set up tofirst baffle 3 for being fixed in probe body 1 on, probe body 1 passes the discoid structure atfirst baffle 3 center to make along the circumferential direction of straight pole section, coil spring all has the action point withfirst baffle 3. In order to reduce the influence of the coil spring on the weight of the probe assembly and ensure the reliability of the performance of the coil spring, 1Cr18Ni9Ti austenitic stainless steel material is adopted as the coil spring.

Example 7:

this example was further optimized and refined on the basis of example 6:

as a person skilled in the art, if only considering that the probe can realize the surface contact between themetal film 2 and the object to be tested under the action of the elastic force, only thefirst baffle 3 needs to be arranged, the connectingcap 5 can slide along the straight rod section, and the elastic member 4 is arranged between thefirst baffle 3 and the connectingcap 5, in order to avoid the loss of the connectingcap 5, which may be caused by the sliding of the connectingcap 5 along the straight rod section, so that the probe assembly can well maintain the structural integrity, the arrangement is as follows: the probe also comprises a second baffle fixed on the probe body 1 and used for limiting the position of a sliding stop point of the connectingcap 5 on the straight rod section towards the side far away from themetal film 2. As a person skilled in the art, it is sufficient that the coil spring, the connectingcap 5, is located between thefirst shutter 3 and the second shutter, which may be provided in a form consistent with the above-proposed form of thefirst shutter 3 in a disc-like structure.

Example 8:

this example was further optimized and refined on the basis of example 4:

as described above, in the form of thefirst shutter 3, the coil spring, and the connectingmember 10 of the connectingcap 5 only, when the connectingcap 5 is rotated, a torque may be applied to the probe body 1 by a frictional force, which may cause themetal film 2 to be worn, adversely affecting the integrity of the resonant cavity. To avoid this, the following settings are set: the probe structure further comprises a cross rod 9 fixed on the side wall of the probe body 1 and protruding outwards relative to the side wall of the probe body 1, and the cross rod 9 is located between the connectingpiece 10 and themetal film 2. When the novel probe is used specifically, the cross rod 9 can serve as a force application part of an operator for the probe body 1, if the cross rod 9 is held, the torque is cancelled by shearing the cross rod 9, and the phenomenon that themetal film 2 rotates synchronously with the probe body 1 under the action of the connectingcap 5 is avoided. Preferably, set up to be in the in-process of rotating connectingcap 5 compression coil spring, through horizontal pole 9, pass probe body 1 to one side at 5 places of lateral connection cap for the surface that all should not the measured object ofmetal film 2 contacts at the whole in-process of rotating connectingcap 5, and the feed volume of connectingcap 5 satisfies: after removing the constraint of the crossbar 9, themetal film 2 can be brought into contact with the surface and the helical spring is in compression. Like this, after connectingcap 5 and rotating to the position, under the external force that the user exerted on probe body 1, can realize tometal film 2 with the impact strength on surface is controllable, like this, can effectively ensuremetal film 2's integrity. When the implementation of the optical fiber probe is implemented, on the basis of a traditional optical fiber probe structure (polished rod), in order to avoid the influence of the installation of the cross rod 9 on the shape of the probe and the quality of the inner wall of the probe caused by the introduction of welding heat, the sleeve ring 8 is arranged to further comprise a sleeve and is fixed on the probe body 1, and the cross rod 9 is fixed on the outer wall of the sleeve ring 8. Thus, the fixing of the cross rod 9 and the lantern ring 8 can be completed outside the probe body 1, and then the connection of the cross rod 9 and the probe body 1 can be completed through bonding.

Example 9:

the embodiment provides a measuring device for detonation testing based on embodiment 1, including a probe, where the probe is the probe in embodiment 1;

one end of the probe body 1 is provided with ametal film 2, and the other end is connected with a light source and an optical signal monitoring device through anoptical fiber 6. The scheme is a measuring device comprising the probe. The light source is used for inputting the light source to the probe assembly, and the optical signal monitoring device is used for monitoring optical feedback monitoring. In specific implementation, in order to facilitate signal strength, it is preferable that theoptical fiber 6 and the inner wall surface of the probe body 1 are in smooth transition.

Example 10:

this embodiment provides a measuring method for detonation test based on embodiment 1, and the measuring method uses the probe described in embodiment 1, and themetal film 2 on the probe is in contact with the surface of the object to be measured. As mentioned above, the method is a measuring method which adopts the probe to realize detonation test, has high test sensitivity and low requirement on energy.

Example 11:

this example provides a more detailed use example based on example 7:

a probe assembly for detonation test, which is a probe assembly for testing end coating, includes an optical fiber probe having ametal film 2 which is a coating film and is an aluminum film, aconnection cap 5, a coil spring, and anoptical fiber 6 as a tail fiber. The end face of the optical fiber probe is a plane vertical to the axis, and the plane is plated with an aluminum film.

The aluminum film is a mirror-surface type reflecting film, and the thickness of the aluminum film is uniform and ranges from 5 micrometers to 10 micrometers. The head of the optical fiber probe is a metal cylindrical shell with the same outer diameter, and the outer diameter of the cylindrical shell is 1 mm. The other end of the end face of the optical fiber probe is provided with two round steps which are arranged at intervals and have a certain distance, the round steps are respectively used as afirst baffle 3 and a second baffle, the distance between the two round steps is 4mm, the distance between the round step which is close to the nearest aluminum film and the end face of the optical fiber probe is 10mm, the outer diameter of each round step is 2mm, the thickness of each round step is 1mm, and the outer diameter of the probe part between the two round steps is 1 mm. And a connectingcap 5 serving as a threaded sleeve is limited between the two circular steps of the optical fiber probe. The thread bush is a metal cylinder, the outer diameter is 3mm, an external thread (thread section) used for realizing the fixed connection of the probe assembly is arranged close to the end face (test end) of the optical fiber probe, and the thread is a fine thread with the diameter of 0.5 mm. The inner axis direction of the threaded sleeve is provided with a step hole (formed by thecentral hole 51 and the pore passage 52), the step height (the end plate thickness) is 1mm, the pore diameter (thepore passage 52 diameter) is 1.1mm, and the step hole and the pore passage are coaxial with each other. The rear end of the spring is positioned in the threaded sleeve and limited between the threaded sleeve and the step close to the end face of the optical fiber probe, the spring is made of 1Cr18Ni9Ti austenitic stainless steel materials, the total height of the spring is 3mm, and the pitch of the spring is 0.5 mm. The tail fiber is positioned at the tail part of the probe component, is coaxial with the tail end of the optical fiber probe, and has the same outer diameter basically, the tail fiber and the optical fiber probe are fixed by adopting a high-temperature-resistant polymer adhesive, and the tail part of the tail fiber is connected with other devices and keeps the light path normal.

Thefiber 6 core in the pigtail is confined in the fiber probe, and thefiber 6 core size used is 125 μm.

The concrete use is as follows: the probe assembly is fixed by the connectingcap 5 to themetal film 2 to contact with the surface of the object to be tested, and the helical spring generates compression deformation.

The tail fiber of the optical fiber probe is connected with a laser light source and monitoring instrument equipment serving as an optical signal monitoring device, and the adopted laser wavelength is 1550 nm. When the testing end face of the optical fiber probe is not subjected to pressure higher than the threshold value, a resonant cavity is formed in the optical fiber probe assembly, theoptical fiber 6 and the instrument equipment, and the signal amplitude in the monitoring instrument equipment is stable and straight. The fiber probe is in a state to be tested.

When the testing end face of the optical fiber probe assembly receives high-strength pressure of detonation waves or shock waves, the shock waves enter the optical fiber probe assembly, the aluminum coating on the testing end face of the optical fiber probe is damaged, the resonant cavity is damaged, and a step disturbing signal is emitted from the end face of the optical fiber probe assembly. And the monitoring instrument equipment converts and records the disturbance signal to obtain an obvious step pulse signal. The leading edge of the step pulse signal is less than 5ns and appears clearly in the observed signal range by subsequent data processing analysis.

The above process is repeated under the conditions of low air pressure, high temperature, vibration or shock, and humid environment, and the step pulse signal can be repeatedly obtained due to the existence of the elastic member 4. The technical scheme provided by the embodiment can be suitable for testing the detonation waves and the shock waves under the special environmental conditions, has better adaptability, and is favorable for testing reliability, stability and testing precision.

Referring to the drawings of the above embodiments, as shown in fig. 1, there is provided a technical solution in which ametal film 2 is disposed at an end of a probe body 1, afirst baffle 3 is fixed on a rod section of the probe body 1, an elastic member 4 capable of elastically deforming along a length direction of the probe body 1 acts on thefirst baffle 3, aconnection cap 5 is disposed at one end of the elastic member 4 far from thefirst baffle 3, and anoptical fiber 6 as a pigtail is connected to a tail of the probe body 1;

as shown in fig. 2, it provides a technical solution that the end of the probe body 1 is provided with ametal film 2, the rod section of the probe body 1 is provided with aconnector 10, and the tail of the probe body 1 is connected with anoptical fiber 6 as a pigtail;

as shown in fig. 3, in the specific implementation manner, on the basis of the structure shown in fig. 1, a cross bar 9 is arranged on a bar section between the front end of the probe body 1 and the connectingpiece 10, and the cross bar 9 is fixedly connected with the probe body 1 through a lantern ring 8;

as shown in fig. 4, there is provided a connectingcap 5, the end of the connectingcap 5 is provided with ahole 52 for the probe body 1 to pass through, acentral hole 51 for accommodating a part of the elastic member 4 and for the probe body 1 to pass through the connectingcap 5 is provided with an external thread on the side for fixing the connectingcap 5, and when in specific use, the elastic member 4 is provided with pressure by the inner side of the end and the elastic member 4.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (5)

1. A probe assembly for detonation testing, comprising a probe, wherein the probe is:

the probe comprises a probe body (1) and a metal film (2) arranged at one end of the probe body (1), wherein the metal film (2) is a plated film and is an aluminum film;

the probe structure also comprises an end plug (7) embedded in a pore channel of the probe body (1), wherein the end plug (7) is made of a light-transmitting material, and the metal film (2) is formed on the end face of the probe body (1) and the surface of the end plug (7);

the probe body (1) is also provided with a connecting piece (10) for realizing the fixed connection of the probe and a measured object;

the connecting piece (10) satisfies: the probe can be connected to the object to be measured in a manner that the metal film (2) is in contact with the surface of the object to be measured through the connecting piece (10);

the connecting piece (10) comprises an elastic piece (4) and a pressing plate, one end of the elastic piece (4) can act on the probe body (1), the pressing plate can act on the other end of the elastic piece (4), and the elastic piece (4) can elastically deform in the length direction of the probe body (1);

in the length direction of the probe body (1), the elastic piece (4) is positioned between the metal film (2) and the pressing plate;

one end of the probe body (1) provided with the metal film (2) is a straight rod section;

the pressing plate is a connecting cap (5) with an external thread on the outer surface and a central hole (51) on the inner side, the opening end of the connecting cap (5) faces the metal film (2), and the connecting cap is sleeved on the straight rod section through a pore passage (52) in the center of the end plate;

the elastic piece (4) is a spiral spring sleeved on the straight rod section;

the probe also comprises a first baffle (3) fixed on the straight rod section, and the spiral spring acts on the end surface of the first baffle (3) through the end part and acts with the probe body (1);

one end of the spiral spring, which is far away from the metal film (2), is embedded into the central hole (51), and the outer diameter of the spiral spring and the aperture of the central hole (51) meet the following requirements: the position of the coil spring relative to the axis of the straight rod segment may be defined by the contact of the outer surface of the coil spring with the wall of the central bore (51).

2. The probe assembly for detonation testing according to claim 1, characterised in that it further comprises a second stop fixed to the probe body (1) for defining a sliding dead point position of the connection cap (5) on the straight section of rod towards the side remote from the metallic membrane (2).

3. The probe assembly for detonation testing according to claim 1, characterised in that it further comprises a cross-bar (9) fixed to the lateral wall of the probe body (1) and projecting with respect to the lateral wall of the probe body (1), said cross-bar (9) being located between the connection element (10) and the metal membrane (2).

4. A measuring device for detonation testing, comprising a probe assembly, wherein the probe assembly is the probe assembly of claim 1;

one end of the probe body (1) is provided with a metal film (2), and the other end of the probe body is connected with a light source and an optical signal monitoring device through an optical fiber (6).

5. A measuring method for detonation test, characterized in that it uses a probe assembly according to claim 1, the metallic membrane (2) of which is in contact with the surface of the object to be measured.

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