Background
The normal intracranial pressure of a human body is 0.9-2.0 kPa, and various nervous system diseases can cause the increase of the intracranial pressure, so that the monitoring of the intracranial pressure has great significance in the clinical treatment of various nervous system diseases such as intracranial injury, cerebrovascular diseases, meningitis and the like. Intracranial pressure is detected by an intraventricular catheter and a dural bolt method in clinic, but the methods have the defects of difficult puncture, only reflection of local pressure, easy infection and the like. In recent years, minimally invasive treatment using a sensor system has become another important method of monitoring intracranial pressure. Compared with an electrical sensor, the optical fiber sensor has the characteristics of electromagnetic compatibility, small volume, high sensitivity, high resolution and the like and is paid attention to. Compared with an electrical sensor, the optical fiber sensor has the characteristics of electromagnetic compatibility, small volume, high sensitivity, high resolution and the like and is paid attention to. The optical fiber Fabry-Perot sensor is the optical fiber sensor which has the longest history, the most mature technology and the most common application. When coherent light beam is incident into the microcavity along the optical fiber, the two high reflecting layers reflect part of light back along the original path and meet to produce interference, the interference signal is related to the length of the microcavity, and the pressure is applied to the microcavity to change the cavity length and the interference output signal, so that the interference output signal is demodulated to realize sensing of various external parameters.
In recent years, various optical fiber fabry-perot sensors satisfying high sensitivity and resolution of intracranial pressure measurement have been proposed, which have the characteristics of (1) biocompatibility, (2) small size, (3) sufficiently high sensitivity, resolution and dynamic range, and (4) a demodulation system capable of monitoring minute pressure changes. The optical fiber Fabry-Perot sensor has the advantages that under the action of intracranial pressure, the change range of the micro-cavity length in the sensor corresponds to the change of intracranial pressure, the micro-cavity length of the optical fiber Fabry-Perot sensor needs to be controlled to be in the order of tens of micrometers to realize the linear sensing of intracranial pressure, the manufacturing process difficulty and the cost of precisely controlling the cavity length are conceivable, and therefore, a cavity length demodulation mode with low requirement on the accuracy of the initial cavity length is an effective way for reducing the processing difficulty and the cost, and the optical fiber F-P sensor has important significance in the field of intracranial pressure measurement.
The signal demodulation of the optical fiber F-P sensor mainly comprises two types of intensity demodulation and phase demodulation, the intensity demodulation method is simple, the result error is larger, the phase demodulation method is accurate, and the method becomes a current common method. Common phase demodulation methods include fringe counting, fourier transform, and correlation. The fringe counting method and the Fourier transform method depend on demodulation hardware, such as a high-precision spectrometer or a scanning light source, but the spectrometer has huge volume, high price and low acquisition speed, and a matched demodulation algorithm is quite complex and time-consuming, so that the method is not suitable for practical engineering and is not suitable for intracranial pressure detection with high requirements on real-time detection. In contrast, the correlation method is more suitable for practical engineering application based on the correlation operation realized by the optical element.
For example, the Fizeau interferometer demodulation method in the correlation method has good long-term reliability, the hardware is relatively simple, the demodulation algorithm is relatively visual, and the demodulation method is very suitable for demodulating the optical fiber F-P sensor with the initial cavity length which cannot be accurately controlled. However, the demodulation mode needs to use a high-precision optical wedge with a very small inclination angle to construct an interference signal matched with the cavity length of a micro-cavity in the optical fiber sensor to realize correlation operation, and according to the index of the traditional photoelectric detector linear array, the wedge angle of the demodulation mode needs to be about 0.1 degree order of magnitude and reach the processing precision of second degree, and the assembly precision of optical elements such as a collimating lens, a cylindrical mirror and the like and the photoelectric detector array of the demodulation mode also has extremely high requirements. Therefore, the whole price of the demodulator of this type is still high and cannot be widely used by the medical industry.
The optical wedge processing technique is generally to grind the optical wedge by using the technique methods such as a parallel light rubber mat method, a high-precision wedge glass clamp replication method, a wedge metal clamp method, a single block wedge angle changing pasting method and the like. In the method, only the high-precision wedge glass clamp method can manufacture small-size small-angle second-level precision wedge angle optical wedge parts in batches, and the processing principle of the technology is that after the parts are combined with the high-precision wedge glass clamp, the finished wedge angle of the parts and the wedge angle of the wedge glass clamp are processed by utilizing the relation that the wedge angles are mutually staggered angles, and after the parts and the wedge glass clamp are polished, redundant parts are ground, so that the parts reach the required wedge angle. The technological method is implemented on the premise that the wedge-shaped glass clamp with higher wedge angle precision is required, but the wedge-shaped glass clamp with higher precision has the medical fields of higher requirements on processing technical indexes, higher processing difficulty, longer manufacturing period, lower processing efficiency and yield, high manufacturing cost and small single part requirement.
Therefore, when the optical fiber F-P sensor with the initial cavity length which cannot be accurately controlled is demodulated based on a Fizeau interferometer, a glass optical wedge manufacturing tool and a manufacturing method which can more economically meet the requirement of engineering mass production are urgently needed.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides the following technical scheme:
A tooling for the manufacture of an optical wedge, the optical wedge being a transparent optical element having a wedge-shaped interface, the optical wedge comprising two sheets of glass, the two sheets of glass having an included angle of less than 1/10 radian, along the direction of the intersection end of the two sides of the included angle toward the open end, the distance between the wedge-shaped interfaces varying gradually and continuously and the refractive index of the glass remaining unchanged, the tooling comprising:
The positioning groove and the two pieces of flat glass are matched so that the two pieces of flat glass can be positioned and installed in the positioning groove; the positioning groove comprises a bottom and a side wall, and a gap which is not more than a preset distance exists between the side wall and the plate glass after the two plate glasses are installed in the positioning groove, so that the plate glass can be placed in the positioning groove and cannot shake along the bottom of the positioning groove by more than the preset distance; an open space is reserved at the top opposite to the bottom, so that the plate glass far away from the bottom is suitable for moving a certain angle and displacement relative to the plate glass adjacent to the bottom, and the included angle and the relative position between the two plate glasses are suitable for adjusting; the spacer bayonet is arranged on the side wall and used for positioning a standard spacer, after the flat glass adjacent to the bottom is arranged in the positioning groove, the standard spacer can be clung to the upper surface of the flat glass adjacent to the bottom through the spacer bayonet, so that the gap between the two flat glasses is accurately adjusted, and the upper surface is a surface facing the gap between the two flat glasses;
and a plurality of dispensing grooves provided at the side wall such that a gap between the two plate glasses loaded into the positioning groove and spaced apart by the standard spacer is exposed in the dispensing grooves.
Preferably, the side walls comprise a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are oppositely arranged in the width direction of the positioning groove, the third side wall and the fourth side wall are oppositely arranged in the length direction of the positioning groove, the third side wall is far away from the third side wall along the length direction, and the gap between the two pieces of flat glass which are installed in the positioning groove and are separated by the standard spacer is gradually increased.
Preferably, the relief groove extends along a length direction of the positioning groove and penetrates through the fourth side wall, and the notch on the fourth side wall extends upwards away from the bottom along the fourth side wall until penetrating through a top end of the fourth side wall. The positioning groove has the beneficial effects that the positioning groove is easy to process.
Preferably, a first section is arranged on one side of the first side wall and one side of the second side wall, which are close to the fourth side wall, and the first sections are parallel to the fourth side wall and staggered by the same preset distance in the length direction;
After the plate glass adjacent to the bottom is arranged in the positioning groove, the end face of the fourth side wall, which is far away from the bottom, is not higher than the upper surface of the plate glass adjacent to the bottom, and the connecting end between the first section and the fourth side wall is not higher than the upper surface of the plate glass adjacent to the bottom;
The first section and the end face, far away from the bottom, of the fourth side wall form a spacer bayonet, the standard spacer is a spacer with at least one flat end face, and the standard spacer can enable the flat end face to be clung to the first section through the spacer bayonet. The device has the beneficial effects that the accurate adjustment of the gap between two pieces of flat glass is realized by using the thickness of the spacer and the staggered preset distance.
Preferably, the first side wall and the second side wall are symmetrically provided with optical fiber clamping grooves, the optical fiber clamping grooves are staggered with the third side wall by the same preset distance in the length direction, and the standard spacer is an optical fiber with a standard core diameter. The optical fiber structure has the beneficial effects that the accurate adjustment of the gap between two pieces of flat glass is realized by utilizing the size of the optical fiber core diameter and the staggered preset distance.
Preferably, a second section is arranged on one side of the first side wall and one side of the second side wall, which are close to the third side wall, the second section and the third side wall are staggered by a preset distance in the length direction, and the dispensing slot is arranged between the second section and the third side wall. The novel arc-shaped section forming device has the beneficial effects that the second section and the third side wall are staggered by a preset distance in the length direction, so that a space is reserved for processing the arc-shaped section of the third side wall, and the novel arc-shaped section forming device is convenient to process.
Preferably, the third side wall is provided with one dispensing slot, and the first side wall and the second side wall are symmetrically provided with a plurality of dispensing slots at intervals.
Preferably, the fixture further comprises a pressing block, the pressing block is connected with the side wall through a rotating shaft, and the pressing block is used for pressing the combination of the two piece of flat glass and the standard spacer, which are arranged in the positioning groove, when dispensing.
The manufacturing method of the optical wedge, which uses the tooling of the technical proposal, comprises the following steps:
S1, preparing two pieces of flat glass with the same material, wherein the flat glass is made of an optical glass transparent material, one surface of the flat glass is plated with an antireflection film, and the other surface of the flat glass is plated with a semi-transparent and semi-reflective film with a certain transmittance and reflectance;
S2, loading the plate glass adjacent to the bottom into a positioning groove along the side wall, so that one surface of the plate glass plated with the antireflection film is clung to the bottom, and the surface plated with the semi-transparent and semi-reflective film is upward;
s3, placing a standard spacer to the spacer bayonet so that the standard spacer clings to the upper surface of the plate glass adjacent to the bottom, wherein the upper surface is a surface plated with a semi-transparent semi-reflective film;
S4, loading the plate glass far away from the bottom into a positioning groove along the side wall to be tightly attached to the standard spacer, so that the two surfaces plated with the semi-transparent and semi-reflective film are opposite, and abutting against one end of the plate glass loaded in the step S1 to form an included angle;
s5, compacting the combined body formed in the steps, and dispensing and curing along the dispensing grooves;
S6, cleaning the glue overflowing the end face, and removing the part of the standard spacer, which exceeds the end face;
The order of steps S3, S4 may be interchanged.
Preferably, the standard spacer is a standard thin film made of an organic material or an optical fiber having a standard core diameter.
Compared with the prior art, the optical wedge manufacturing method has the advantages that the optical wedge is manufactured by a method different from the prior art, after two pieces of flat glass are positioned by a tool, the gap between the two pieces of flat glass is adjusted by the standard spacer, the precision of the manufactured optical wedge is adjusted and controlled by the precision of the standard spacer, the cost is low, the mass manufacturing is easy, and the precision of the manufactured optical wedge by the tool and the method can meet the requirement of demodulating the optical fiber F-P sensor with the initial cavity length which cannot be accurately controlled based on the Fizeau interferometer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, an optical fiber F-P sensor, an optical fiber Fabry-Perot sensor, and a Fabry-Perot sensor are synonymous.
Referring to fig. 12, referring to fig. 1 and 2, an optical wedge is a transparent optical element having a wedge interface, the optical wedge includes two pieces of flat glass 6, one ends of the two pieces of flat glass 6 are abutted, and the other ends are clamped by a spacer 30, an included angle between the two pieces of flat glass is smaller than 1/10 radian, along a direction from an intersecting end of two sides of the included angle to the open end, a distance between the wedge interfaces is gradually and continuously changed, and a refractive index of the flat glass is kept unchanged, and the optical wedge comprises:
The positioning groove 10, the positioning groove 10 and the two pieces of flat glass 6 are adapted so that the two pieces of flat glass 6 can be positioned and fitted into the positioning groove 10, specifically, a section of the flat glass perpendicular to the thickness direction of the flat glass 6 and a section of the positioning groove perpendicular to the depth direction of the positioning groove 10 are adapted, and the two pieces of flat glass 6 form a side wall portion where the wedge angle end is lower in height than the abutting side wall portion. The positioning groove 10 comprises a bottom 40 and a side wall, wherein after two pieces of flat glass 6 are installed in the positioning groove 10, a gap which is not more than a preset distance exists between the side wall and the flat glass 6, so that the flat glass 6 can be placed in the positioning groove without shaking along the bottom of the positioning groove beyond the preset distance;
The spacer bayonet is arranged on the side wall and used for positioning the standard spacer, after the flat glass adjacent to the bottom 40 is arranged in the positioning groove 10, the standard spacer can be clung to the upper surface of the flat glass adjacent to the bottom 40 through the spacer bayonet, so that the gap between the two flat glasses 6 can be accurately adjusted, the upper surface is a surface facing the gap between the two flat glasses 6, and in actual use, the lower surface of the flat glass far from the bottom 40 is also pressed against the standard spacer, and the lower surface is a surface facing the gap between the two flat glasses 6. As shown in fig. 2, the bottom 40 is provided with a relief groove 404 for relieving the effective working surface of the sheet glass so that the sheet glass contacts the bottom 40 only at the periphery of the edge.
A plurality of dispensing grooves 50 are provided at the side walls such that a gap between two plate glasses 6 loaded into the positioning groove 10 and spaced apart by a standard spacer is exposed to the dispensing grooves 50.
In some embodiments, as shown in fig. 1 and2, the side walls include a first side wall 101, a second side wall 102, a third side wall 103 and a fourth side wall 104, the first side wall 101 and the second side wall 102 are disposed opposite to each other in the width direction of the positioning groove 10, the third side wall 103 and the fourth side wall 104 are disposed opposite to each other in the length direction of the positioning groove 10, and the gap between two flat glasses 6 fitted into the positioning groove 10 and spaced by a standard spacer gradually increases apart from the third side wall 103 in the length direction. In some embodiments, as shown in fig. 1 and2, two pieces of flat glass 6 are rectangular parallelepiped, one ends of the two rectangular parallelepipeds are in contact with the third side wall 103, and are far away from the third side wall 103 along the length direction, and the other ends are connected by a spacer; in other embodiments, the two sheets of glass 6 may be square, or have a cross-section in the shape of a partial arc or a partial ellipse, which is truncated in the transverse or longitudinal direction.
In some embodiments, as shown in fig. 2, the relief groove 404 extends along the length of the positioning groove 40, and the notch of the relief groove 404 on the fourth sidewall 104 extends along the fourth sidewall 104 up away from the bottom 40 until penetrating the top end of the fourth sidewall 104. .
In some embodiments, as shown in fig. 1 and 2, a first section 110 is disposed on one side of the first side wall 101 and the second side wall 102 near the fourth side wall 104, and the first section 110 is parallel to the fourth side wall 104 and staggered by the same preset distance in the length direction;
After the plate glass 6 adjacent to the bottom 40 is loaded into the positioning groove 10, the end surface of the fourth side wall 104 away from the bottom 40 is not higher than the upper surface of the plate glass 6 adjacent to the bottom 40, and the connecting end between the first section 110 and the fourth side wall 104 is not higher than the upper surface of the plate glass 6 adjacent to the bottom 40;
the end surfaces of the first section 110 and the fourth side wall 104 remote from the bottom 40 form a spacer bayonet, and the standard spacer is a spacer 30 having at least one flat end surface, and the standard spacer enables the flat end surface to be tightly attached to the first section 110 through the spacer bayonet. Accordingly, as shown in fig. 1, the first section 110 is offset from the third sidewall 103 by a distance L2, and the precise adjustment of the gap and wedge angle between the two sheets of glass sheets 6 is achieved by the thickness of the spacer 30 and the offset preset distance.
In some embodiments, as shown in fig. 1 and fig. 2, the first side wall 101 and the second side wall 102 are symmetrically provided with optical fiber 29 clamping grooves 60, the optical fiber 29 clamping grooves 60 are staggered by the same preset distance from the third side wall 103 in the length direction, and the standard spacer is an optical fiber 29 with a standard core diameter. The gap and wedge angle between two pieces of flat glass 6 can be accurately adjusted by using the size of the core diameter of the optical fiber 29 and the staggered preset distance L1.
In some embodiments, as shown in fig. 1-3, a second section 120 is disposed on one side of the first side wall 101 and the second side wall 102 near the third side wall 103, the second section 120 and the third side wall 103 are staggered by a preset distance in the length direction, and a dispensing slot 50 is disposed between the second section 120 and the third side wall 103, as shown in fig. 1 and 3, a fourth dispensing slot 504 and a sixth dispensing slot 506 are shown. The second section 120 and the third side wall 103 are staggered by a preset distance in the length direction, which is beneficial to leaving space for processing the arc-shaped section 90 of the third side wall 103 and is convenient to process.
In some embodiments, the third sidewall 103 is provided with one dispensing slot 50, and the first sidewall 101 and the second sidewall 102 are symmetrically provided with a plurality of dispensing slots 50 at intervals. As shown in fig. 1 to 3, in the present embodiment, the third side wall 103 is provided with one dispensing slot 50, that is, a fifth dispensing slot 505, and the first side wall 101 and the second side wall 102 are symmetrically provided with four dispensing slots 50 respectively, which are sequentially a first dispensing slot 501, a second dispensing slot 502, a third dispensing slot 503, a fourth dispensing slot 504, and a sixth dispensing slot 506, a seventh dispensing slot 507, an eighth dispensing slot 508, and a ninth dispensing slot 509, which are distributed on the second side wall 102. Wherein the fourth and sixth glue grooves 504, 506 are open.
In some embodiments, as shown in fig. 4 and 5, the fixture further comprises a pressing block, wherein the pressing block is connected with the side wall through a rotating shaft, and the pressing block is used for pressing the combination of the two flat glass 6 and the standard spacer, which are loaded into the positioning groove 10, during dispensing. Specifically, the rotating shaft 39 passes through the through holes of the tool 36 and the press block 37, and glue is dispensed from the holes on the press block 37 to fix the press block shaft 39 and the press block 37, so that the press block shaft 39 and the press block 37 can swing around the through holes of the tool 36 when the tool 36 is fixed. One end of the torsion spring 38 penetrates through the through hole of the rotating shaft 39, and the other end penetrates through the through hole of the tooling 36, and when the system is in the state shown in fig. 5, the pressing block 37 can press the flat glass 6 assembly.
In this embodiment, as shown in fig. 6 and 7, the optical plate glass 6 with a better surface shape and optical coating is selected, the plate glass 6 has a semi-transparent and semi-reflective film, the transmission and reflection ratio includes not only 50/50,60/40, 70/30, 80/20, but also a film made of an organic material (such as PDMS organic film, a polyimide film, etc.) or an optical fiber 29 with a standard core diameter, which can control the thickness of precision, the two plate glasses 6 are respectively a first optical plate glass 611 and a second optical plate glass 622, the first optical plate glass 611 is a plate glass 6 adjacent to the bottom 40, and the second optical plate glass 622 is a plate glass 6 far from the bottom 40.
The method comprises the following steps:
S1, preparing two pieces of flat glass with the same material, wherein the flat glass is made of an optical glass transparent material, one surface of the flat glass is plated with an antireflection film, and the other surface of the flat glass is plated with a semi-transparent and semi-reflective film with a certain transmittance and reflectance;
s2, loading the plate glass 6 adjacent to the bottom 40 into the positioning groove 10 along the side wall, so that the plate glass 6 is clung to the bottom 40, and the semi-transparent and semi-reflective film plated surface faces upwards;
specifically, the first optical sheet glass 611 is placed between the first surface 1001 and the second surface 1002 of the optical wedge fabricating tool and faces the fourth surface 1004 of the tool, the third surface 63 of the first optical sheet glass 611 is made to be in close contact with the third surface 1003 of the optical wedge fabricating tool, the second surface 62 of the first optical sheet glass 611 is made to be in close contact with the fourth surface 1004 of the optical wedge fabricating tool, and the fifth surface 65 of the first optical sheet glass 611 is made to be in close contact with the ninth surface 1009 of the optical wedge fabricating tool.
S3, placing the standard spacer to the spacer bayonet so that the standard spacer is clung to the upper surface of the plate glass 6 adjacent to the bottom 40, wherein the upper surface is a semi-transparent and semi-reflective film plated surface;
Specifically, the assembly spacer 30 is placed in parallel between the fourth surface 64 of the first optical flat glass 611 and the second surface 62 of the second optical flat glass 622 until the third surface 33 of the assembly spacer 30 is in close contact with the seventh surface 1007 and the eighth surface 1008 of the optical wedge manufacturing tool, or the assembly spacer optical fiber 29 is placed along the optical fiber 29 positioning groove 10 of the optical wedge manufacturing tool before the second optical flat glass 622 is placed;
S4, loading the plate glass 6 far away from the bottom 40 into the positioning groove 10 along the side wall to be tightly attached to the standard spacer, so that the two surfaces plated with the semi-transparent and semi-reflective film are opposite, and enabling the plate glass 6 loaded in the step S1 to be abutted against one end part to form an included angle;
Specifically, the third surface 63 of the second optical flat glass 622 is placed along the direction of 60 degrees with the fourth surface 64 of the first optical flat glass 611, so that the third surface 63 is closely attached to the third surface 1003 of the optical wedge manufacturing tool;
s5, compacting the combined body formed in the steps, and dispensing and curing along the dispensing grooves 50;
Specifically, the fourth surface 64 and the fifth surface 65 of the second optical sheet glass 622 are pressed, the second surface 62 of the second optical sheet glass 622 is abutted against the second surface 32 of the fitting spacer 30, the fourth surface 64 of the first optical sheet glass 611 is abutted against the first surface 301 of the fitting spacer 30, or the fitting spacer optical fiber 29 is abutted against the second surface 62 of the second optical sheet glass 622 and the fourth surface 64 of the first optical sheet glass 611, respectively, and the abutted positions of the first optical sheet glass 611 and the second optical sheet glass 622 are cured by dispensing at the positions of the first to ninth dispensing grooves 50 of the optical wedge manufacturing tool, respectively;
S6, cleaning the glue overflowing the end face, and removing the part of the standard spacer, which exceeds the end face;
Specifically, the cured optical wedge is taken out, the glue overflowed from the first surface 61, the third surface 63, the fifth surface 65 and the sixth surface 66 (namely, the first surface, the third surface, the fifth surface and the sixth surface of the optical wedge) of the plate glass 6, the parts of the assembly spacing optical fiber 29 and the assembly spacing gasket 30 which exceed the first surface 61, the third surface 63, the fifth surface 65 and the sixth surface 66 of the plate glass 6 are scraped off along the end face of the optical wedge by a small knife and cleaned, namely, the fourth surface 304, the fifth surface 305 and the sixth surface 306 of the assembly spacing gasket 30 are correspondingly trimmed.
The order of steps S3, S4 may be interchanged.
In some embodiments, the standard spacer is a standard thin film of organic material or an optical fiber having a standard core diameter.
As shown in fig. 8, 9 and 10, the optical wedge manufactured as described above is applied to an optical sensing device for measuring physical parameters, comprising:
a light source for generating an optical signal having a predetermined spectral characteristic, connected to the base 5 through a light source mounting block 14;
A fabry-perot sensor through which an optical signal passes, the fabry-perot sensor comprising two half mirrors substantially parallel to each other and spaced apart by a given distance so as to define a fabry-perot cavity having a transmittance or reflectance characteristic influenced by a physical parameter and causing a spectrum, the characteristic of the optical signal being varied in response to the physical parameter, the fabry-perot sensor being provided with at least one optical fiber for transmitting the optical signal into the fabry-perot cavity and for collecting at least a portion of the optical signal output from the fabry-perot cavity;
A fizeau interference module, comprising:
The base 5, a side wall of the base 5 is provided with a through hole;
The optical fiber interface assembly is arranged on the through hole;
The linear array CCD comprises a CCD sensor 3 and a CCD circuit board 4, wherein the CCD sensor 3 is in circuit connection with the CCD circuit board 4, and an optical path 9 is formed between the CCD sensor 3 and the optical fiber interface component;
The optical wedge assembly is arranged on an optical path, as shown in fig. 11, and comprises an optical wedge, an auxiliary spacing pad 302 and a positioning block 8, wherein the optical wedge comprises two pieces of flat glass 6 and a spacing pad 30, one ends of the two pieces of flat glass 6 are abutted, in the embodiment, the lower sides are abutted, the other ends (in the embodiment, the upper sides) are separated through the spacing pad 30, the inclined surface of the optical wedge is tightly attached to the auxiliary spacing pad 302 at one end without the spacing pad 30 to form the optical wedge assembly, the optical wedge assembly is arranged in the positioning block 8, the positioning block 8 is connected with the base 5, and in the embodiment, the spacing pad 30 and the auxiliary spacing pad 302 are the same and are symmetrically arranged relative to the optical axis of the optical wedge.
In this embodiment, the optical wedge is manufactured by the manufacturing method of the present invention;
As shown in fig. 10, the CCD sensor 3 is connected with the plane of the optical wedge in a bonding manner, and the CCD circuit board 4 is mounted on the other side wall of the base 5;
the Fizeau interference module further comprises a collimating lens and a shaping lens 2 which are arranged on the base, the light transmitted by the optical fiber interface component sequentially passes through the collimating lens, the shaping lens 2 and the optical wedge to reach the CCD sensor 3 by referring to a formed light path 9, and the shaping lens 2 is arranged on the base 5 through the lens mounting seat 1.
At least one part of the optical signal is accessed into the Fizeau interference module through the optical fiber interface assembly;
leaving from the optical wedge, by the optical wedge, a spatially extended optical signal representing the transmittance or reflectance characteristics of the fabry-perot sensor;
whereby the physical parameter can be determined by spatially expanding the optical signal.
Specifically, as shown in fig. 8, the base 5 is placed on any plane, the optical fiber interface assembly includes an optical fiber adapter 10, the optical fiber adapter 10 is screwed into a through hole on the side surface of the base 5 through its own external thread, and an optical fiber adapter 11 with a main optical fiber 12 welded at the tail is screwed into the external thread of the optical fiber adapter 10 to a limit position through its own internal thread. The light source mounting block 14 and the CCD circuit board 4 are respectively mounted on different sides of the base 5 through screws, and the cylindrical mirror mounting seat 1 and the positioning block 8 are respectively mounted at the bottom of the counter bore of the base 5 through screws.
As shown in fig. 8, the main optical fiber 12 is coupled to an auxiliary optical fiber 21 connected to a light source at an intersecting position, and the auxiliary optical fiber 21 is connected to the light source through a fiber ferrule 18.
The pressure sensing film 13 is attached to the end face of the main optical fiber 12 through glue, as shown in fig. 9, a counter bore is machined on the end face of the optical fiber, and a closed cavity is formed between the counter bore and the pressure sensing film 13, namely the fabry-perot sensor.
In the embodiment, the optical sensing device is matched integrally, so that the precision requirement on the initial cavity length of the F-P sensor is reduced, and meanwhile, the precision adjustment on the optical wedge is realized through the spacer, so that the engineering requirements of the medical industry can be economically and batched met.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited thereto, but may be modified or substituted for some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.