CN102721662A - Mining infrared gas sensor with high efficiency of light sources - Google Patents
Mining infrared gas sensor with high efficiency of light sources Download PDFInfo
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- CN102721662A CN102721662A CN2011102022571A CN201110202257A CN102721662A CN 102721662 A CN102721662 A CN 102721662A CN 2011102022571 A CN2011102022571 A CN 2011102022571A CN 201110202257 A CN201110202257 A CN 201110202257A CN 102721662 A CN102721662 A CN 102721662A
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Abstract
The invention relates to an infrared gas sensor, particularly a mining infrared gas sensor with high efficiency of light sources. The sensor comprises a signal processing circuit and an optical air chamber, wherein the optical air chamber comprises inner tubes and outer tubes which are telescoped and have air vents uniformly distributed on the circumferential surface, a circular bore between the inner tube and the outer tube is provided with a hydrophobic folded filter core, the end surface of one end of the optical air chamber is connected with the cavity of an enclosed parallel spectrum light emitting unit, the end surface of the other end is connected with the cavity of an enclosed light convergence detector unit, and the photosensitive element of the detector unit converts optical intensity signals into electric signals and amplifies, and then is connected with the signal processing circuit through a data line. According to the invention, the optical path is prolonged without depending on reflection, and the fault that the sensor losses efficiency quickly after the reflecting surface is polluted is eliminated. The manufacturing process of the lens used in the invention with convergence effect is mature, the manufacturing cost can be greatly reduced after batch production, thus high absorbing capacity of infrared lights in small space can be achieved with low cost.
Description
Technical field
The present invention relates to infrared gas detector, be specifically related to a kind of infrared gas sensor of mining high light source utilization ratio.
Background technology
The every field that is widely used in gas analysis based on the infrared gas sensor of NDIR (NDIR) know-why; For a change the coal mine downhole safety monitoring system is used the present situation of the catalysis firedamp sensor that needs frequent check and correction always; Increasing research institution develops the infrared gas sensor based on the NDIR principle that is used under the coal mine in succession, shows that substituting the catalysis firedamp sensor that always uses in the colliery for a long time with more advanced infrared gas sensor has become development trend.
Although it is on probation just to introduce China's coal-mine based on the infrared gas sensor of NDIR technology at the beginning of the nineties in last century; But passed through more than 20 year; Infrared gas sensor still fails extensively to promote the popularization use in the colliery; One of the main reasons is never both to be adapted to rugged surroundings under the coal mine in the industry, has than high performance-price ratio again simultaneously, and can demonstrate fully the product of infrared sensor superiority.
Be widely used in breadboard infrared gas sensor and be applied under the coal mine existing, the major issue that needs to solve is that sensor must adapt to the abominable working environment under the coal mine.If this problem can not finely be resolved, the advantage that infrared gas sensor has in laboratory environment will be replaced by the inferior position that rugged surroundings caused under the coal mine.
Infrared gas sensor belongs to optical sensor, and is similar with the visible light optical system, and dust is the maximum jinx of optical system.Under the coal mine particularly the working environment of coal-face essential variation has taken place for the clean environment in laboratory.Under coal mine; If infrared gas sensor does not solve contradiction that reduced size space and higher infrared Absorption amount require, the contradiction of the contradiction that requires of response and high-quality dustproof contradiction, moisture vapor influence and low-power consumption, high-performance and contradiction, variation of ambient temperature and the sensor stability requirement of low price requirement fast, infrared gas sensor uses under coal mine just to be had no advantage and can say.
To above problem, many research institutions have all proposed reply way separately.
Influence problem for solving moisture vapor, Chinese patent CN101825566A increases in small sensor and heats and thermostat, and detector is worked under higher, the metastable condition of temperature, makes steam be unlikely to condense.Chinese patent 200720307032.1 makes the temperature in the cavity higher about 3 ℃ than external environment through heat preserving and insulating material is set in optical cavity, lets steam in cavity, not condense.Chinese patent 200710062967.2 hinders steam at 0.2 to 3 micron hydrophobic micropore filtering membrane and gets into the optics air chamber through micro-pore diameter is set.
For overcoming the influence of pollution caused by coal dust, Chinese patent 200710063467.0,200710062967.2,200710062968.7,200720103593.X all through the porous nano filtering membrane is set, hinders dust and pass through when letting gas pass through.
Change in order to overcome the infrared light supply light intensity that temperature variation causes and the output of infrared eye, Chinese patent 200620098454.8 respectively in infrared emission assembly and infrared receiving unit the arrangement microheater make transmitting illuminant and infrared probe be in temperature constant state.Chinese patent 200720307032.1,200710063467.0,200720188521.X, 200620111569.6 all come calibrating sensors concentration through setting up temperature sensor.
For solving the contradiction that requires with little space and bigger infrared absorbing amount; European patent EP 1509759B, Chinese patent 200710063467.0,200710062967.2 have all adopted the ellipsoid mode, and the characteristic of utilizing the light that is sent by focus of hollow ellipsoid after the reflection of ellipsoid inside surface, can converge at another focus prolongs light path; Chinese patent 200810113176.2,200810113178.1 all adopts two gold-plated spherical mirrors to make light source just arrive receiver through repeatedly reflecting; When having prolonged light path, also have and make the light that arrives receiver satisfy aplanatic characteristic basically; Light on the receiver is evenly distributed, has improved the signal to noise ratio (S/N ratio) of light signal; Chinese patent CN101825566A prolongs light path with gold-plated archimedean spiral groove light path; Chinese patent 200720307032.1 prolongs light path through the e type structure of an open-ended; Chinese patent 200910105832.9 prolongs light path through the inclined-plane grooved reflecting surface that surface gold-plating is set in air chamber.
Above patented technology has solved the problem that infrared gas sensor is applied under the coal mine to be faced to a certain extent.Regrettably, often when having solved a problem, caused the generation of new problem again.In order to solve the contradiction of little space and bigger infrared absorbing amount, the infrared gas sensor that all exploitations are used for the colliery has all adopted the air chamber inwall to adopt the also gold-plated way as reflecting surface of high machining precision and smooth finish to prolong light path.The result who does has like this caused three problems to need to solve again.The existing probe that is designed for the infrared gas sensor in colliery of the first all adopts diameter less than 30 millimeters, and higher primary school is in 40 millimeters cylindrical structure.Mostly the inlet channel of probe is the air inlet window of right cylinder top (end) portion, and the diameter of air inlet window is less than 30 millimeters, and the moistureproof dustproof main hole that relies on is realized at the microporous hydrophobic filtering membrane of 200-3000 nanometer.The filtering membrane area is usually less than 800mm
2, under coal mine, particularly at getting working face, the concentration of moist coal dust is very high, and the filtering membrane that area is very little is easy to piled up shutoff by the coal dust of humidity, causes the sensor's response time to prolong significantly; Secondly; Owing to utilize the curved surface in the micro air chamber to come repeatedly reflects infrared light as catoptron; To reach the purpose that prolongs light path; Grinding, polishing processing and the plating that need carry out high precision, best bright finish to curved surface complex-shaped in the air chamber are there to be the noble metal of high reflectance to infrared light---and gold forms reflecting surface, and this has just caused the air chamber cost to rise significantly, has further strengthened low price and high performance contradiction; The 3rd, although the hole of filtering membrane is very little in theory, dust can't get into; But in the actual use; Particle scale is lower than micron-sized coal dust dust and still can enters into air chamber and attached on the inner reflective wall, cause the reflectivity of infrared light to descend significantly, after the reflectivity of air chamber inwall drops to a certain degree; Sensor just can't work on, and causes the real work life-span to be far smaller than predetermined age.
For ultimate principle of the present invention is described, is necessary the hypothesis precondition of applied Lan Bo-Beer law in the prior art done and briefly introduces.
The basic functional principle of NDIR infrared gas sensor is Lan Bo-Beer law.This law is expressed as: when a branch of collimated monochromatic ligth during through uniform non-scattering sample, sample is directly proportional with the concentration and the thickness of sample to the absorbance of light.Mathematic(al) representation is: I/I0=exp
-ECL
In the formula:
I0: incident intensity (collimated monochromatic ligth).
I: transmitted light intensity (by the light intensity after the extinction material absorption).
E: absorptivity (percentage absorptivity commonly used during gas analysis.Finger is when certain wavelength, and concentration is 1% (W/V), the absorbance when thickness is 1cm).
L: extinction material thickness (light path).
C: extinction material concentration.
The prerequisite that above mathematic(al) representation is derived is that the unit cross-sectional area of extinction material is a constant constant in light path; That is to say; The sectional area of incident intensity position equates with the sectional area of transmitted light intensity position; In the case, the unit cross-sectional area dS of extinction material, light path L and volume V have following relation:
dS=V/L,
According to the definition of extinction material concentration, the physical significance of extinction material concentration (C) is extinction particle (atom, the lewis' acid) number (n) in the unit volume (V),
That is: C=n/V.
By with co-relation, obtain light when spatial transmission, extinction particle (atom, the lewis' acid) number on a certain popin face unit cross section depends on the concentration and the thickness (also claiming light path) of extinction material:
n/dS?=?VC/(V/L)?=?LC。
At its mathematic(al) representation: I/I0=exp
-ECLExplicit in; Parameters such as light path L, incident intensity I0, transmitted light intensity I, concentration C and absorptivity E have only been comprised; Do not comprise area S parameter, that gives the people feels to be exactly that concentration is only relevant with the absorptivity and the light path of intensity variations, extinction material, and irrelevant with area.Prior art that Here it is prolongs light path to improve the main theory foundation that absorbs light particle number through repeatedly reflecting in short space.
The drawback that the way that adopts the mode that prolongs light path to improve absorption light particle number is brought is come the processing optical passage except needs high machining high-precision and smooth finish; Simultaneously; Also need the coating Precious Metals-Gold to form the higher optical reflection face of reflectivity, like this, will cause the with high costs of air chamber; In addition, also because when emissive power one timing, the growth of light path will cause the order of magnitude decay of light intensity signal with geometric series, repeatedly after the reflection, will cause that the detector signal to noise ratio (S/N ratio) descends rapidly; The more important thing is because the size of the photosensitive unit of detector is all very little usually, generally be about 1 * 2mm
2, meaning only has 2mm
2The particle that sectional area multiply by in the such volumes of light path can contribute to the absorption of light, and the absorption that particle produced in other volume beyond the responsive elemental area is owing to received by detector, and has been wasted.The air chamber space is big more, and invalid absorption particle is many more, and efficient is low more.Increasing light path is appreciated that to the series system that multiply by the such volumes unit of light path with photosensitive elemental area and increases light-absorbing available gas particle number.
If adopt sectional area design inequality; Let with the mode that is similar to parallel connection all light-absorbing gas particles all produce contribution to the output of detector in the air chamber space, whether can be issued to the purpose that increases light-absorbing available gas particle number in the situation that does not increase light path equally.
According to geometrical optics light intensity law:
I
1dS
1=I
2dS
2。
In the formula, I
1For light at the cross section dS of unit
1The light intensity at place, I
2For light at the cross section dS of unit
2The light intensity at place.
Geometrical optics light intensity law shows that IdS remains unchanged along a light pipe.The dS bin reduces, and the I light intensity must increase.When the dS bin was identical, light intensity was constant.This shows, when the light intensity of light source specifically is discussed, is closely-related with light area on a certain popin face in the spatial transmission process.When derivation Lan Bo-Beer law, assumed condition is: light is that the area of horizontal infection and incident intensity position equates with the area of transmitted light intensity position, thus draw concentration only with thickness, the relevant conclusion of intensity variations.When light is not directional light, under the unequal situation of area of the area of incident light strength and transmitted light strength, concentration is not only relevant with thickness, and is simultaneously also relevant with area.Adopt cross section design inequality, can reach the purpose that is issued to the light-absorbing available gas particle number of increase in the situation that does not increase light path.
Can prove this point through a simple experiment, with plane mirror sunlight reflected to photodetector, the light signal strength of detector output is close basically with the intensity of sunlight direct projection detector; Its degree of closeness depends on the reflectivity of catoptron, in the case, no matter how strong sunlight is; Detector can not burnt; Its reason is that the photosensitive elemental area of detector is very little, and acting to photosensitive unit only is light in the responsive elemental area scope, the light beyond the responsive elemental area; Detector is not produced contribution, this is similar to adopt and reflects the prolongation light path; And when with a large diameter condenser lens sunlight being converged at detector, detector can be burnt because of light intensity is too strong.Obviously, this is because the result that the light acting in conjunction in the lens area scope is caused in the photosensitive unit of detector.
Summary of the invention
Problem to above prior art existence; The infrared gas sensor that the purpose of this invention is to provide a kind of mining high light source utilization ratio can be realized not reaching and prolonging the target that light path method institute will reach through prolonging light path, and available implemented with low cost is in the higher infrared Absorption amount of less space acquisition; Prolong the life-span of sensor; Can effectively hinder dust and moisture vapor, the sensor's response time is shortened significantly, further ensure the safety of Coal Production.
The technical scheme that the present invention adopted is: the optics air chamber is evenly the distribute interior pipe and the outer tube together that be nested in of air hole of circumferential surface; Be provided with hydrophobic type at the circular bore of interior pipe and outer tube and folded filter core; The end face of one end of optics air chamber connects the cavity of the parallel broad-spectrum light transmitter unit of sealing; The end face of the other end connects the cavity that the light that seals converges detector cells; The photosensitive unit of detector cells changes light intensity signal electric signal into and after amplifying, is connected to signal processing circuit through data line.
The structure of broad-spectrum light transmitter unit is the reflection shield of packing in the transmitter unit cavity that at one end seals; The focal point settings wide spectrum light source of reflection shield; Reflection shield front port sealing collimation lens; The wide spectrum light source is positioned on the focus of collimation lens simultaneously, and the front end of transmitter unit cavity has the screw thread that is connected with the optics air chamber; The structure of detector cells is pack into successively in the detector cells cavity that at one end seals infrared detector photosensitive elements and plus lens, and photosensitive unit is positioned on the focus of plus lens and by plus lens and is sealed in the detector cells cavity.
In the broad-spectrum light transmitter unit; Wide spectrum light emitted drive circuit board and transmitting illuminant circuit board locating piece tight bond; And the wide spectrum light source is welded on the wide spectrum light emitted drive circuit board, transmitting illuminant circuit board locating piece is threaded or bonds with reflection shield, and reflection shield is stuck on the step bayonet socket in the transmitter unit cavity; Fixed by rubber washer and reflection shield hold-down ring, collimation lens is fixed in the transmitter unit cavity by rubber washer and lens hold-down ring; In detector cells; Photosensitive unit is welded on the amplifier circuit board of its front end; Amplifier circuit board is fixed on the detector cells cavity inner wall by the circuit board hold-down ring again, and plus lens is fixed in the detector cells cavity inner wall through the rubber washer and the plus lens hold-down ring of both sides.
Signal processing circuit of the present invention has comprised known power circuit, signal control processor, oscillatory circuit, LED demonstration and driving circuit, LCD demonstration and driving circuit, sound and light alarm output circuit, temperature observation circuit, nonvolatile storage circuit, signal output apparatus.
The lens that adopt in described broad-spectrum light transmitter unit and the detector cells are processed by the material that can see through 3 ~ 5 micron wave length infrared lights, for example: zinc selenide, calcium fluoride, tygon.
Said lens are spherical lens or non-spherical lens or Fresnel Lenses.
The substantive features of content of the present invention are exactly to let extinction particle as much as possible all acts in the responsive unit of detector in the optics air chamber, can in less space, not increase effective extinction particle number through increasing light path like this.
Therefore the present invention can not produce dependence fully and reflect the fault that the contaminated back of the reflecting surface that sensor ran into that prolongs light path structure sensor lost efficacy very soon owing to do not rely on reflection fully; Need the expensive optical cavity manufacturing process of the expensive golden reflecting film structure of best bright finish, high precision and coating to compare with traditional based on repeatedly reflecting the way that increases light path; The eyeglass manufacturing process that works the effect of converging in the present invention is ripe; Can reduce manufacturing cost significantly after the production in enormous quantities; Continuous progress along with material, design and process technology; The lens of new material and aspheric surface or Fresnel structure can realize that major diameter and large tracts of land converge cheaply, thereby can further improve light intensity and the power consumption that reduces transmitting illuminant, with implemented with low cost in the higher infrared Absorption amount of less space acquisition; Because detector and light source are enclosed construction, though eyeglass contaminated after, also can recover its function very soon through putting on the skin to wipe away and clean, prolong the life-span of sensor greatly; Because transmitting and receiving the unit is enclosed construction, moisture vapor can't enter in transmitting illuminant unit and the infrared eye unit, can the output signal of detector not exerted an influence; Because the filter core that folded between the air chamber inner and outer pipes has the specific surface area than big 1 one magnitude of filtering membrane of existing structure; When effectively hindering dust and moisture vapor; The sensor's response time is shortened significantly, further ensured the safety of Coal Production.
Description of drawings
Fig. 1 is the structural representation of the infrared gas sensor of high light source utilization ratio;
Fig. 2 is a broad-spectrum light transmitter unit structural drawing;
Fig. 3 is the detector cells structural drawing;
Fig. 4 is the signal processing circuit block diagram.
Among the figure: detector cells 1; Broad-spectrum light transmitter unit 2; Interior pipe 3; Cross filter core 4; Outer tube 5; Air hole 6; Transmitter unit cavity 201; Reflection shield 202; Transmitting illuminant circuit board locating piece 203; Wide spectrum light emitted drive circuit board 204; Wide spectrum light source 205; Rubber washer 206; Reflection shield hold-down ring 207; Collimation lens 208; Lens hold-down ring 209; Detector cells cavity 101; Amplifier circuit board 102; Photosensitive unit 103; Circuit board hold-down ring 104; Plus lens 105; Rubber washer 106; Plus lens hold-down ring 107.
Embodiment
To combine accompanying drawing and embodiment that the present invention is done further explanation below.
Shown in Fig. 1; Sensor of the present invention comprises detector cells 1, broad-spectrum light transmitter unit 2, interior pipe 3, crosses filter core 4 and outer tube 5; The spectral light of sending by broad-spectrum light transmitter unit 1 through by interior pipe 3, cross the optics air chamber that filter core 4 and outer tube 5 form and arrive detector cells 1, at the circumferential surface of interior pipe 3 and outer tube 5 air hole 6 that evenly distributes.
Referring to Fig. 2, broad-spectrum light transmitter unit 2 comprises transmitter unit cavity 201, reflection shield 202, transmitting illuminant circuit board locating piece 203, wide spectrum light emitted drive circuit board 204, wide spectrum light source 205, rubber washer 206, reflection shield hold-down ring 207, collimation lens 208, lens hold-down ring 209.Wide spectrum light source 205 is launched the light that the required light intensity of infrared thermal release electric is modulated under the driving of wide spectrum light emitted drive circuit board 204.Wide spectrum light source 205 is positioned at the focus of reflection shield 202; Make the light that sends after the reflection of reflection shield 202, become directional light, wide spectrum light source 205 is positioned on the focus of collimation lens 208, so simultaneously; The light that is sent by wide spectrum light source 205 forms parallel rays and penetrates behind collimation lens 208 collimation.Wide spectrum light source 205 is welded on the wide spectrum light emitted drive circuit board 204; Wide spectrum light emitted drive circuit board 204 is threaded or bonds with transmitting illuminant circuit board locating piece 203 usefulness; Transmitting illuminant circuit board locating piece 203 is threaded or bonds with reflection shield 202; Reflection shield 202 is threaded with transmitter unit cavity 201, radially accurately locatees to realize wide spectrum light source 205 and reflection shield 202, guarantees that wide spectrum light source 205 is positioned on the central axis of light ray propagation; Reflection shield hold-down ring 207 is used for reflection shield 202, transmitting illuminant circuit board locating piece 203, wide spectrum light emitted drive circuit board 204 and wide spectrum light source 205 are carried out axial location; Lens hold-down ring 209 is used for lens are carried out axial location, and rubber washer 206 is used to finely tune the axial distance of collimation lens 208 and wide spectrum light source 205, is positioned on the focus of collimation lens 208 to guarantee wide spectrum light source 205; Lens hold-down ring 209, rubber washer 206, collimation lens 208, the transmitter unit cavity 201 common wide spectrum light source transmitter units that constitute a sealing; Can guarantee that not only light source and gas are isolated fully in the explosion gas environment; Be convenient to after contaminated clean and put on the skin and wipe away but also can work as minute surface; Can also further converge simultaneously the luminous energy of wide spectrum light source, improve light efficiency.
Shown in Fig. 3, detector cells comprises detector cells cavity 101, amplifier circuit board 102, photosensitive unit 103, circuit board hold-down ring 104, plus lens 105, rubber washer 106, plus lens hold-down ring 107.Light by the transmitter unit emission converges in the photosensitive unit 103 through plus lens 105; According to how much light intensity laws, in the light ray propagation process, IdS is always a constant; When light propagates into photosensitive unit 103 from the position of plus lens 105, because the area of plus lens is much larger than the area of photosensitive unit, therefore; The light intensity at photosensitive unit place is much larger than the light intensity at plus lens place; All participate in light-absorbing gas particle all to the input generation effect of photosensitive unit in the optics air chamber space, have increased effective particle number of gas absorption light, have improved the signal to noise ratio (S/N ratio) of detector.Photosensitive unit 103 is welded on the amplifier circuit board 102; Amplifier circuit board 102 closely is crimped on the detector cells cavity 101 by circuit board hold-down ring 104; The cylindrical of amplifier circuit board 102 and detector cells cavity 101 are closely connected; Guaranteed the radial location of the photosensitive unit 103 of infrared eye, circuit board hold-down ring 104 is threaded with detector cells cavity 101, has guaranteed the axial location of amplifier circuit board 102 and photosensitive unit 103.Plus lens hold-down ring 107 is threaded with detector cells cavity 101; Plus lens 105 is being pressed under the effect of plus lens hold-down ring 107 on the rubber washer 106; Realization is to the axial location of plus lens 105; Rubber washer 106 is used to finely tune the distance of convergent lens 105 and photosensitive unit 103, covers photosensitive unit 103 fully to guarantee the hot spot that plus lens 105 compiles.Plus lens hold-down ring 107, plus lens 105, rubber washer 106, the detector cells cavity 101 common detector cells that constitute sealing; Not only can be not through increasing the target that light path reaches increases effective extinction particle number in less space; But also can under the contaminated situation of lens, be convenient to clean and put on the skin and wipe away minute surface, improve serviceable life.
Shown in Fig. 4, signal processing circuit is connected with broad-spectrum light transmitter unit circuit, and signal processing circuit outputs a control signal to the broad-spectrum light transmitter unit according to frequency, the voltage and current parameter of program setting, the light emission of control broad-spectrum light transmitter unit; Treatment circuit also is connected with the detector cells circuit; Signal processing circuit is handled the light intensity signal of the signal of detector cells output, obtains the concentration signal of gas to be measured, compares with the concentration value and the predefined alarming value that calculate; Produce corresponding sound and light alarm signal; Simultaneously, the concentration value that calculates supplies substation to carry out further analyzing and processing through the coal mine underground monitoring substation of signal output apparatus transmission.Signal processing circuit also comprises known power circuit, signal control processor, oscillatory circuit, LED demonstration and driving circuit, LCD demonstration and driving circuit, sound and light alarm output circuit, temperature observation circuit, nonvolatile storage circuit, signal output apparatus, repeats no more.
Claims (5)
1. the infrared gas sensor of a mining high light source utilization ratio; Comprise signal processing circuit, an optics air chamber; It is characterized in that: the optics air chamber is evenly the distribute interior pipe and the outer tube together that be nested in of air hole of circumferential surface; Be provided with hydrophobic type at the circular bore of interior pipe and outer tube and folded filter core, the end face of an end of optics air chamber connects the cavity of the parallel broad-spectrum light transmitter unit of sealing, and the light that the end face of the other end connects sealing converges the cavity of detector cells; The photosensitive unit of detector cells changes light intensity signal electric signal into and after amplifying, is connected to signal processing circuit through data line.
2. press the infrared gas sensor of the described mining high light source utilization ratio of claim 1; It is characterized in that: the structure of broad-spectrum light transmitter unit is the reflection shield of packing in the transmitter unit cavity that at one end seals; The focal point settings wide spectrum light source of reflection shield; Reflection shield front port sealing collimation lens, the wide spectrum light source is positioned on the focus of collimation lens simultaneously, and the front end of transmitter unit cavity has the screw thread that is connected with the optics air chamber; The structure of detector cells is pack into successively in the detector cells cavity that at one end seals infrared detector photosensitive elements and plus lens, and photosensitive unit is positioned on the focus of plus lens and by plus lens and is sealed in the detector cells cavity.
3. press the infrared gas sensor of the described mining high light source utilization ratio of claim 2; It is characterized in that: in the broad-spectrum light transmitter unit; Wide spectrum light emitted drive circuit board and transmitting illuminant circuit board locating piece tight bond; And the wide spectrum light source is welded on the wide spectrum light emitted drive circuit board, transmitting illuminant circuit board locating piece is threaded or bonds with reflection shield, and reflection shield is stuck on the step bayonet socket in the transmitter unit cavity; Fixed by rubber washer and reflection shield hold-down ring, collimation lens is fixed in the transmitter unit cavity by rubber washer and lens hold-down ring; In detector cells; Photosensitive unit is welded on the amplifier circuit board of its front end; Amplifier circuit board is fixed on the detector cells cavity inner wall by the circuit board hold-down ring again, and plus lens is fixed in the detector cells cavity inner wall through the rubber washer and the plus lens hold-down ring of both sides.
4. by the infrared gas sensor of the described mining high light source utilization ratio of claim 3, it is characterized in that: the lens that adopt in broad-spectrum light transmitter unit and the detector cells are processed by the material that can see through 3～5 micron wave length infrared lights.
5. by the infrared gas sensor of the described mining high light source utilization ratio of claim 3, it is characterized in that: the lens that adopt in broad-spectrum light transmitter unit and the detector cells are selected spherical lens, non-spherical lens or Fresnel Lenses for use.
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| CN103033487A (en) * | 2012-12-27 | 2013-04-10 | 济南兰光机电技术有限公司 | Device for detecting gas humidity with infrared light |
| CN104089884A (en) * | 2013-12-18 | 2014-10-08 | 力合科技（湖南）股份有限公司 | Optical front-end structure of gas analyzer |
| WO2018083941A1 (en) * | 2016-11-02 | 2018-05-11 | 日本電気硝子株式会社 | Optical cap component |
| JP2018077205A (en) * | 2016-11-02 | 2018-05-17 | 日本電気硝子株式会社 | Optical cap component |
| CN109100320A (en) * | 2018-07-12 | 2018-12-28 | 镇江市爱威尔电子有限公司 | A kind of Miniature intelligent infrared gas sensor |
| CN110132427A (en) * | 2018-12-11 | 2019-08-16 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of infrared acquisition amplifier applied to Multi spectral thermometry instrument |
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