The optical assay device of gas and methodTechnical field
The present invention relates to photoanalysis, particularly to new type light source and should the optical assay device of gas of light source, sideMethod.
Background technology
In gas sensor, the output of diode laser just high divergence, it is therefore desirable to use collimating opticsElement, such as collimating lens.And the introducing of collimating lens can make to produce between laser instrument and lens to interfere: laser instrument sendsThe laser impinging perpendicularly on lens rear surface has partially reflective time laser instrument, and the front window at laser instrument reflects, againImpinging perpendicularly on lens rear surface, front and back the emergent light of twice can form an interference.In the process measuring gas absorption signalIn, interfere the striped formed will greatly reduce gas detecting limit, it is therefore desirable to do one's utmost to avoid or eliminate.
Tradition eliminates the method for optical interference noise between collimating lens and laser instrument to be had:
1. lens plating anti-reflection film, plating anti-reflection film can only reduce interference strength to a certain extent, can not suppress light wellLearn noise, and the transmitance of bloomed lens can be polluted with daily wiping and minute surface and reduce；
2. lens and optical axis are angled.When the angle of lens axis and optical axis is less, pressing down of optical interference noiseAbility processed is poor；When lens and optical axis included angle are bigger, the most serious aberration, beam collimation weak effect will be there is.
Summary of the invention
For solving the deficiency in above-mentioned prior art, the invention provides that a kind of optical noise is low, low cost newType light source.
It is an object of the invention to be achieved through the following technical solutions:
A kind of new type light source, described new type light source includes:
Luminous body, described luminous body is fixed on support；
First support, described first support is used for carrying described luminous body；
Light collimation device, in the light path of the emergent light that described light collimation device is fixed on described luminous body, goes out described in collimationPenetrate light；The axis of described light collimation device is acute angle with the angle of the light between centers of described emergent light；
Tumbler, described light collimation device is fixed on described tumbler；
Second support, described tumbler is rotatably arranged on described second support；
Motor, described motor is used for driving described tumbler and light collimation device to rotate.
According to above-mentioned new type light source, it is preferable that described acute angle is less than 30 degree.
According to above-mentioned new type light source, it is preferable that described light collimation device is plate-convex lens, described emergent light is worn successivelyCross plane and the convex surface of described lens.
According to above-mentioned new type light source, it is preferable that described first support is the sleeve with radial component and axial component,Described luminous body is fixed on the center of described radial component.
According to above-mentioned new type light source, it is preferable that described tumbler is bearing, the portion of the axial component of described first supportBeing allocated as is the second support, and the outer ring of described bearing is fixed on described second support.
According to above-mentioned new type light source, alternatively, described new type light source farther includes:
Fixture, described light collimation device is arranged on described fixture, and described fixture is arranged on described tumbler；Described motor drives described fixture to rotate.
According to above-mentioned new type light source, it is preferable that described fixture is sleeve.
According to above-mentioned new type light source, it is preferable that described luminous body is laser instrument.
The present invention also aims to provide the gas applying above-mentioned new type light source of the high and low cost of a kind of accuracy of detectionOptical assay device, this goal of the invention is achieved by the following technical programs:
The optical assay device of gas, described optical assay device includes light source, detector and analytic unit；
Described light source uses above-mentioned new type light source；
Described analytic unit includes averager, computing module, and described averager comes for the transmission of average described detectorSpectroscopic data entrained by the signal of telecommunication, send described computing module afterwards；After described computing module utilizes spectral technique to process averagelyThe signal of telecommunication.
The present invention also aims to provide the high gas applying above-mentioned optical assay device of a kind of accuracy of detectionAnalysis method, this goal of the invention is achieved by the following technical programs:
The analysis method of the gas according to above-mentioned optical assay device, described analysis method comprises the following steps:
(A1) what luminous body sent measures the light collimation device collimation that light is rotated；
(A2) the measurement light after collimation is injected in region to be measured, interacts with gas to be measured；
(A3) the measurement light penetrating described region to be measured is converted to the signal of telecommunication, and send analysis module；
(A4) the average described signal of telecommunication of averager, computing module utilizes the signal of telecommunication after spectral technique process averagely, knowsThe parameter of gas to be measured.
Compared with prior art, the device have the advantages that into:
1. the axis of light collimation device is acute angle with the angle of the light between centers of luminous body emergent light, reduces to a certain extentOptical noise, but also reduce collimating effect；But, by rotating described light collimation device,
The condition producing optical interference when making every time to measure is different, complementary relevant between optical interference noise, by inciting somebody to actionThe spectroscopic data multiple averaging that the optical signal measured carries, both can suppress optical interference noise significantly, significantly reduce againThe adverse effect that the collimating effect difference band that the light collimation device being obliquely installed is brought comes；
Light collimation device plated surface anti-reflection film, reduce further optical noise；
The above-mentioned light source that optical noise is little is favorably improved the analysis precision of the laser gas analyzer applying this light source；
The most each device is cheap and easy to get so that whole light source low cost.
Accompanying drawing explanation
Referring to the drawings, the disclosure will be easier to understand.Skilled addressee readily understands that: thisA little accompanying drawings are used only for illustrating technical scheme, and are not intended to be construed as limiting protection scope of the present invention.In figure:
Fig. 1 is the structure diagram of the new type light source of according to embodiments of the present invention 1；
Fig. 2 is the structure diagram of the new type light source of according to embodiments of the present invention 2.
Detailed description of the invention
How Fig. 1-2 and the optional embodiment following description describing the present invention are implemented with teaching those skilled in the artWith the reproduction present invention.In order to instruct technical solution of the present invention, simplify or eliminated some conventional aspects.Those skilled in the artShould be appreciated that be derived from these embodiments modification or replace will within the scope of the invention.Those skilled in the art should understand thatFollowing characteristics can combine to be formed multiple modification of the present invention in every way.Thus, the invention is not limited in following canSelect embodiment, and only limited by claim and their equivalent.
Embodiment 1:
Fig. 1 schematically illustrates the structure diagram of the new type light source of the present embodiment, as it is shown in figure 1, described new type light sourceIncluding:
Luminous body 11, is used for launching monochromatic light；Described luminous body is fixed on the first support；
First support 21, such as circular sleeve, installing plate etc., described support is used for carrying described luminous body, and support is formedBe suitable to the optical channel that described luminous body emergent light passes through；
Light collimation device 81, such as plate-convex lens, described light collimation device is fixed on the light path of the emergent light of described luminous bodyOn, collimate described emergent light；The angle of the light between centers of the axis of described light collimation device and described emergent light is acute angle, as 2 degree,10 degree, 25 degree etc., but less than 30 degree；
Tumbler 31, described light collimation device is fixed on described tumbler；
Second support 61, described tumbler is rotatably arranged on described second support；
Motor 51, described motor is used for driving described tumbler and light collimation device to rotate.
Embodiment 2:
The laser gas analyzer of the embodiment of the present invention, described laser gas analyzer includes:
New type light source, as in figure 2 it is shown, described new type light source includes:
Luminous body 11 selects semiconductor laser with tunable；
First support 21 uses the circular sleeve with radial component, axial component, and described luminous body is fixed on described footpathCenter to part；The part 22 of axial component is as the second support；
Tumbler 31 uses bearing, bearing outer ring to be fixed on described second support, namely the inner side of described axial component；
Fixture 41, fixture uses sleeve, is fixed on tumbler, i.e. on the inner ring of bearing；
Light collimation device 81 uses plate-convex lens, lens to be fixed in described fixture, and the axis of lens is sent out with laser instrumentThe angle of optical axis measuring light gone out is acute angle, and such as 5 degree, lens plating has is easy to the anti-reflection film that described measurement light passes, convex surfaceBack to described laser instrument；
Motor 51, such as the motor driven by modes such as electricity, gas, magnetic, hydraulic pressure, is used for driving described fixture to rotate, makesObtain light collimation device to rotate, but do not occur along the displacement measured along light optical path direction；
Detector, described detector is for being converted to the measurement light with gas to be measured generation interaction through collimationThe signal of telecommunication, and send analytic unit；
Analytic unit, described analytic unit includes: averager, computing module, and described averager is used for average described telecommunicationsNumber spectroscopic data carried, computing module utilize spectral analysis technique process average after spectroscopic data, thus know gas to be measuredThe parameter of body, such as gas content, flow velocity etc..
The analysis method of the gas of the embodiment of the present invention, the work process of the most above-mentioned analyser, described analysis method includesFollowing steps:
(A1) what laser instrument sent measures the light collimation device collimation that light is rotated；
(A2) the measurement light after collimation is injected in region to be measured, interacts with gas to be measured；
(A3) the measurement light penetrating described region to be measured is converted to the signal of telecommunication, and send analysis module；
(A4) spectroscopic data that the average described signal of telecommunication of averager carries, computing module utilizes and pats at absorption spectroscopy techniquesSignal of telecommunication after all, knows the concentration of gas to be measured.
Embodiment 3:
The laser gas analyzer of the embodiment of the present invention, as it is shown in figure 1, as different from Example 2:
1. not in use by fixture, light collimation device is directly anchored on the inner ring of bearing, and motor directly drives inner ring to turnDynamic, rely on the drivewheel of motor to utilize frictional force drives inner ring；
2. the second support is separately provided, and the outer ring of described bearing is fixed on described second support；The survey that laser instrument sendsAmount light is acute angle through angle between light collimation device, and the axis of optical axis and light collimation device, as 10 degree, 15 degree, 20 degree, 30Degree etc..
Above-described embodiment is only that exemplarily to give luminous body be laser instrument, certainly can also is that other luminous bodys, asLED etc..