CN102954947A - Dual light source four detector infrared gas sensor - Google Patents
Dual light source four detector infrared gas sensor Download PDFInfo
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- CN102954947A CN102954947A CN201210436654XA CN201210436654A CN102954947A CN 102954947 A CN102954947 A CN 102954947A CN 201210436654X A CN201210436654X A CN 201210436654XA CN 201210436654 A CN201210436654 A CN 201210436654A CN 102954947 A CN102954947 A CN 102954947A
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Abstract
The present invention provides a double light source four detector infrared gas sensor. According to an optical path of model the sensor, a detector providing a reference effect is concurrently added on a position of a working detector, wherein the two reference detectors are added, a reference light filter is arranged in front of the reference detector, after gas requiring detection is treated by the model, only transmittance of the gas requiring detection is obtained, and the remaining factors can be eliminated. According to the present invention, influence due to gas chamber optical components, dust and other factors can be eliminated, and only one signal proportional to a square of the transmittance of the gas requiring detection is produced, such that anti-interference ability and measurement accuracy are improved with the design.
Description
Technical field
The present invention relates to field of analytic instrument, be specifically related to a kind of pair of light source four detector infrared gas sensors.
Background technology
For the consideration of the safety of protection personnel and property, need to carry out monitoring analysis to the gas in the coal mine (particularly carbon monoxide).Because its circumstance complication of down-hole, there are inflammable, explosive, corrosive gas, temperature is high, high humidity, dust is many, electromagnetic interference (EMI) is strong, and the in addition sensitivity of the stability of light source, explorer response, interference gas, sensor optics element itself all can be measured carbon monoxide gas concentration infrared scattering of light and produce considerable influence.
The infrared absorption type gas detecting theory is based on the Lambert-Beer law, gas with various has different absorption spectrums to infrared light, the characteristic spectrum absorption intensity of certain gas is relevant with the concentration of this gas, how much just can be determined its composition and concentration by gas absorption frequency and energy by analyzing infrared light.And in the infrared spectrum absorption process, light channel structure is the important component part that infrared-gas absorbs, directly have influence on infrared gas sensor accuracy of detection and detection sensitivity, light channel structure commonly used has the two air chamber light channel structures of two light sources, single light source list air chamber light channel structure, the two air chamber light channel structures of single light source etc. at present, for every kind of light path its advantages and disadvantages is arranged, the two air chamber light paths of two light sources have been avoided temperature, pressure, other gases and the impact of flashing determining cause element, do not mate the impact that brings but can't solve air chamber, and two air chamber also more complicated structurally; Though single light source list air chamber light channel structure is simple in structure, extendability is better, but the qualitative impact of flashing, reliability, anti-interference, selectivity aspect Shortcomings, the two air chamber light channel structures of single light source combine front two kinds of relative merits, but the asymmetric error that still causes of the splitting ratio of path-splitting device, above-mentioned light channel structure reckons without all that the optical element such as air chamber absorbs infrared light and the energy loss that causes in addition, absorb the infrared light impact for eliminating the optical elements such as air chamber, the present invention proposes a kind of pair of light source four detector infrared gas sensors.
Summary of the invention
The present invention one of is intended to solve the problems of the technologies described above at least to a certain extent or provides at least a kind of useful commerce to select.For this reason, one object of the present invention is to propose two light sources four detector infrared gas sensors that a kind of antijamming capability is strong, measuring accuracy is high.
A kind of pair of light source four detector infrared gas sensors according to the embodiment of the invention comprise: air chamber (0), and described air chamber is full of gas to be measured in (0); The first light source (1) and secondary light source (2), wherein said the first light source (1) is positioned at top, described air chamber (0) left side, described secondary light source (2) is positioned at below, described air chamber (0) right side, and described the first light source (1) alternately sends the first pulse light and the second pulse light with secondary light source (2); The first detector (3) and the second detector (4), wherein said the first detector (3) is positioned at below, described air chamber (0) left side with the second detector (4), front the first optical filter (7) of measuring wavelength, front the second optical filter (8) that is equipped with reference wavelength of described the second detector (4) of being equipped with of described the first detector (3); The 3rd detector (5) and the 4th detector (6), wherein said the 3rd detector (5) is positioned at top, described air chamber (0) right side with the 4th detector (6), preposition the 3rd optical filter (9) that described measurement wavelength is arranged of described the 3rd detector (5), preposition the 4th optical filter (10) that described reference wavelength is arranged of described the 4th detector (6); And first spectroscope (11), the second spectroscope (12), the first reflective mirror (13) and the second reflective mirror (14), wherein, described the first pulse light is divided into two bundles through described the first spectroscope (11), wherein Ray Of Light passes described air chamber (0) and sends to the 3rd detector (5) and the 4th detector (6), another bundle light sends to the first detector (3) and the second detector (4) through the first reflective mirror (13), wherein, described the second pulse light is divided into two bundles through described the second spectroscope (12), wherein Ray Of Light passes described air chamber (0) and sends to the first detector (3) and the second detector (4), and another bundle light sends to the 3rd detector (5) and the 4th detector (6) through the second reflective mirror (14).
In a preferred embodiment of the invention, described the first light source (1) is light emitting diode with secondary light source (2).
In a preferred embodiment of the invention, detector and corresponding optical filter integrate.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the structural representation of a kind of pair of light source four detector infrared gas sensors of the embodiment of the invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center "; " vertically "; " laterally "; " length "; " width "; " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of indications such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only be for convenience of description the present invention and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the invention, the implication of " a plurality of " is two or more, unless clear and definite concrete restriction is arranged in addition.
In the present invention, unless clear and definite regulation and restriction are arranged in addition, broad understanding should be done in the terms such as term " installation ", " linking to each other ", " connection ", " fixing ", for example, can be to be fixedly connected with, and also can be to removably connect, or connect integratedly; Can be mechanical connection, also can be to be electrically connected; Can be directly to link to each other, also can indirectly link to each other by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand as the case may be above-mentioned term concrete meaning in the present invention.
In the present invention, unless clear and definite regulation and restriction are arranged in addition, First Characteristic Second Characteristic it " on " or D score can comprise that the first and second features directly contact, can comprise that also the first and second features are not directly contacts but by the other feature contact between them.And, First Characteristic Second Characteristic " on ", " top " and " above " comprise First Characteristic directly over Second Characteristic and oblique upper, or only represent that the First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " comprise First Characteristic under the Second Characteristic and tiltedly, or only represent that the First Characteristic level height is less than Second Characteristic.
As shown in Figure 1, a kind of pair of light source four detector infrared gas sensors according to the embodiment of the invention comprise: air chamber 0 is full of gas to be measured in the air chamber 0; The first light source 1 and secondary light source 2, wherein the first light source 1 is positioned at top, air chamber 0 left side, and secondary light source 2 is positioned at below, air chamber 0 right side, and the first light source 1 alternately sends the first pulse light and the second pulse light with secondary light source 2; The first detector 3 and the second detector 4, wherein the first detector 3 and the second detector 4 are positioned at air chamber 0 left side below, are equipped with the second optical filter 8 that is equipped with reference wavelength before the first optical filter 7, the second detectors 4 of measuring wavelength before the first detector 3; The 3rd detector 5 and the 4th detector 6, wherein the 3rd detector 5 and the 4th detector 6 are positioned at air chamber 0 right side top, are equipped with the 4th optical filter 10 that is equipped with reference wavelength before the 3rd optical filter 9, the four detectors 6 of measuring wavelength before the 3rd detector 5; And first spectroscope 11, the second spectroscope 12, the first reflective mirror 13 and the second reflective mirror 14, wherein, the first pulse light is divided into two bundles through the first spectroscope 11, wherein Ray Of Light passes air chamber 0 and sends to the 3rd detector 5 and the 4th detector 6, another bundle light sends to the first detector 3 and the second detector 4 through the first reflective mirror 13, wherein, the second pulse light is divided into two bundles through the second spectroscope 12, wherein Ray Of Light passes air chamber 0 and sends to the first detector 3 and the second detector 4, and another bundle light sends to the 3rd detector 5 and the 4th detector 6 through the second reflective mirror 14.
In a preferred embodiment of the invention, the first light source (1) is light emitting diode with secondary light source (2).Light emitting diode has advantages of that thermal power is little, the advantage that the unit area luminous intensity is high.
In a preferred embodiment of the invention, detector and corresponding optical filter integrate.Integrated component is conducive to miniaturization and the stability of sensor.
The light path model of of the present invention pair of light source four detector infrared gas sensors is to have added simultaneously a detector that plays the reference effect in the position of Industrial detection device, namely increases by two reference detectors, and the reference optical filter is placed in the front.After this model processing, only have the transmittance of gas to be measured, all the other factors all can be eliminated.This structure has been eliminated the impact of the factors such as air chamber optical component, dust, and produce one only with square signal that is directly proportional of gas transmittance to be measured, improved antijamming capability and measuring accuracy.
Suppose certain infrared gas sensor for detection of CO gas, and according to the infrared absorption spectrum feature of carbon monoxide, its infrared radiation to 3.93 μ m does not absorb, the infrared radiation of 4.65 μ m is had stronger absorption.Therefore the optical filter that the reference optical filter is 3.93 μ m can be set, measuring optical filter is the optical filter of 4.65 μ m.Particularly: the first detector 3 and the 3rd detector 5 is front all places the measurement optical filter that wavelength is 4.65 μ m, so that the infrared radiation that shines on these two detectors only is the radiation of 4.65 μ m; The second detector 4 and the 4th detector 6 is front all places the reference optical filter that wavelength is 3.93 μ m is so that the infrared radiation that shines on these two detectors only is the radiation of 3.93 μ m.Two light emitting diodes of the first light source 1 and secondary light source 2 are alternately launched with pulse mode, when the first light source 1 sends pulsed light, the first detector 3, what the second detector 4 received is the radiation that directly comes from the first light source 1, the 3rd detector 5, the 4th detector 6 passes the infrared radiation of air chamber 0 when receiving, because carbon monoxide does not absorb the infrared radiation of 3.93 μ m, so the output of the 4th detector 6 is only relevant with the transmittance of air chamber 0, carbon monoxide has stronger absorption to the infrared radiation of 4.65 μ m, so the output of the 3rd detector 5 is not only relevant with the transmittance of air chamber 0, also relevant with the transmittance that absorbs gas.If the radiation intensity of the first light source 1 and secondary light source 2 is respectively I1 and I2, the responsiveness of the first detector 3, the second detector 4, the 3rd detector 5, the 4th detector 6 is respectively R1, R2, R3, R4, and the transmittance of tested gas is τ
a, the transmittance of air chamber 0 is τ
0Then when the first light source 1 sent pulsed light, the Voltage-output signal that the first detector 3, the second detector 4, the 3rd detector 5, the 4th detector 6 produce was respectively:
v
1=I
1* R
1(measuring optical filter wavelength 4.65 μ m) (1)
v
2=I
1* R
2(reference optical filter wavelength 3.93 μ m) (2)
v
3=I
1* R
3* τ
a* τ
0(measuring optical filter wavelength 4.65 μ m) (3)
v
4=I
1* R
4* τ
0(reference optical filter wavelength 3.93 μ m) (4)
When secondary light source 2 sent pulsed light, what the 3rd detector 5, the 4th detector 6 received was the radiation that directly comes from secondary light source 2, and what the first detector 3, the second detector 4 received is the infrared radiation that passes air chamber 0.Identical with above-mentioned principle, the Voltage-output signal that the first detector 3, the second detector 4, the 3rd detector 5, the 4th detector 6 produce is respectively:
v
5=I
2* R
1* τ
a* τ
0(measuring optical filter wavelength 4.65 μ m) (5)
v
6=I
2* R
2* τ
0(reference optical filter wavelength 3.93 μ m) (6)
v
7=I
2* R
3(measuring optical filter wavelength 4.65 μ m) (7)
v
8=I
2* R
4(reference optical filter wavelength 3.93 μ m) (8)
Marriage relation formula (1), (2), (3), (4), (5), (6), (7), (8) have
The transmissivity (s) that this shows light path system of the present invention has nothing to do and τ with detector responsivity (R) and led radiation intensity (I)
0(optical element itself, dust, interference gas) is irrelevant, and only and τ
a 2Be directly proportional.
Technical scheme of the present invention has not only compensated because the impact that temperature variation is brought, and the impact that brings of the variation of the mismatch of the signal fluctuation that produces of the variation that has compensated variation owing to light-emitting diode output power, detector responsivity, detector, the air chamber transmittance that caused by the wearing and tearing of dust or optical element, realized the coupling of light source and detector spectrum characteristic and tested gas characteristic absorption band.Simultaneously, under the prerequisite that guarantees sensitivity, actual air chamber length can be half of other scheme.The present invention can preferably to outside interference compensation, have very strong practicality.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or the example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although the above has illustrated and has described embodiments of the invention, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art is not in the situation that break away from principle of the present invention and aim can change above-described embodiment within the scope of the invention, modification, replacement and modification.
Claims (3)
1. two light source four detector infrared gas sensors comprise:
Air chamber (0), described air chamber is full of gas to be measured in (0);
The first light source (1) and secondary light source (2), wherein said the first light source (1) is positioned at top, described air chamber (0) left side, described secondary light source (2) is positioned at below, described air chamber (0) right side, and described the first light source (1) alternately sends the first pulse light and the second pulse light with secondary light source (2);
The first detector (3) and the second detector (4), wherein said the first detector (3) is positioned at below, described air chamber (0) left side with the second detector (4), front the first optical filter (7) of measuring wavelength, front the second optical filter (8) that is equipped with reference wavelength of described the second detector (4) of being equipped with of described the first detector (3);
The 3rd detector (5) and the 4th detector (6), wherein said the 3rd detector (5) is positioned at top, described air chamber (0) right side with the 4th detector (6), preposition the 3rd optical filter (9) that described measurement wavelength is arranged of described the 3rd detector (5), preposition the 4th optical filter (10) that described reference wavelength is arranged of described the 4th detector (6); And
The first spectroscope (11), the second spectroscope (12), the first reflective mirror (13) and the second reflective mirror (14),
Wherein, described the first pulse light is divided into two bundles through described the first spectroscope (11), wherein Ray Of Light passes described air chamber (0) and sends to the 3rd detector (5) and the 4th detector (6), another bundle light sends to the first detector (3) and the second detector (4) through the first reflective mirror (13)
Wherein, described the second pulse light is divided into two bundles through described the second spectroscope (12), wherein Ray Of Light passes described air chamber (0) and sends to the first detector (3) and the second detector (4), and another bundle light sends to the 3rd detector (5) and the 4th detector (6) through the second reflective mirror (14).
2. as claimed in claim 1 pair of light source four detector infrared gas sensors is characterized in that, described the first light source 1 is light emitting diode with secondary light source 2.
3. such as claim 1 and 2 described pairs of light source four detector infrared gas sensors, it is characterized in that, detector and corresponding optical filter integrate.
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| CN105675529A (en) * | 2016-01-21 | 2016-06-15 | 电子科技大学 | Microminiature mid-infrared optical waveguide gas sensor |
| CN105810372A (en) * | 2016-04-29 | 2016-07-27 | 句容华源电器设备有限公司 | Insulating plug capable of measuring humidity |
| CN106680235A (en) * | 2017-02-15 | 2017-05-17 | 西安硅光电子科技有限公司 | Active circulating gas suction type infrared multi-light path gas concentration measurement device |
| CN106781205A (en) * | 2017-02-15 | 2017-05-31 | 西安硅光电子科技有限公司 | A kind of pole early stage air suction type gas fire detector and detection method |
| CN107187513A (en) * | 2017-05-23 | 2017-09-22 | 深圳市招科智控科技有限公司 | Harbour container unmanned vehicle collision avoidance system and control method |
| CN108051404A (en) * | 2017-12-27 | 2018-05-18 | 山东微感光电子有限公司 | A kind of sensor probe and gas-detecting device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105593666A (en) * | 2013-09-27 | 2016-05-18 | 旭化成微电子株式会社 | Gas sensor |
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| CN105810372A (en) * | 2016-04-29 | 2016-07-27 | 句容华源电器设备有限公司 | Insulating plug capable of measuring humidity |
| CN106680235A (en) * | 2017-02-15 | 2017-05-17 | 西安硅光电子科技有限公司 | Active circulating gas suction type infrared multi-light path gas concentration measurement device |
| CN106781205A (en) * | 2017-02-15 | 2017-05-31 | 西安硅光电子科技有限公司 | A kind of pole early stage air suction type gas fire detector and detection method |
| CN107187513A (en) * | 2017-05-23 | 2017-09-22 | 深圳市招科智控科技有限公司 | Harbour container unmanned vehicle collision avoidance system and control method |
| CN108051404A (en) * | 2017-12-27 | 2018-05-18 | 山东微感光电子有限公司 | A kind of sensor probe and gas-detecting device |
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