CN111929267A - Gas sensor with low power consumption - Google Patents
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- CN111929267A CN111929267A CN202010780621.1A CN202010780621A CN111929267A CN 111929267 A CN111929267 A CN 111929267A CN 202010780621 A CN202010780621 A CN 202010780621A CN 111929267 A CN111929267 A CN 111929267A
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- 238000001514 detection method Methods 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000032683 aging Effects 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 52
- 238000010521 absorption reaction Methods 0.000 description 11
- 238000007747 plating Methods 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 5
- 229910052737 gold Inorganic materials 0.000 description 5
- 239000010931 gold Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 235000013405 beer Nutrition 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0977—Reflective elements
- G02B27/0983—Reflective elements being curved
Abstract
The invention provides a low-power-consumption gas sensor, which relates to the technical field of infrared light testing and comprises a light source, a collimating lens, a first reflector, a second reflector, a third reflector, a wedge-shaped reflector, a first infrared detector, a second infrared detector and a signal processor, wherein the infrared light source emitted by the light source is collimated into parallel light beams by the collimating lens, the parallel light beams are reflected by the first reflector, the second reflector and the third reflector in sequence and then emitted from the edge direction of the wedge-shaped reflector, and the light beams are divided into detection light beams and reference light beams with opposite irradiation directions after passing through the wedge-shaped reflector; the first infrared detector and the second infrared detector are respectively provided with a detection optical filter and a reference optical filter in the light incidence direction, and the signal processor processes signals received by the infrared detectors. The sensor integrates a reflection light path, reduces the reflection times, increases the light path, and better eliminates the problems of zero drift, range change and misinformation caused by aging.
Description
Technical Field
The invention relates to the technical field of testing by utilizing infrared light, in particular to a low-power-consumption gas sensor.
Background
The non-dispersive infrared absorption (NDIR) principle means that when infrared light passes through a gas to be measured, the gas molecules absorb infrared light with a specific wavelength, the absorption relation of the gas molecules obeys Lambert-Beer (Lambert-Beer) absorption law, and the concentration of the gas is measured through the change of light intensity. Gas molecules have different, specific atomic absorption wavelengths in the infrared band due to vibration between molecules, and thus the gas concentration can be detected by measuring the absorption of optical energy at a specific wavelength. The NDIR gas sensor generally uses a broad-spectrum light source as the light source of the infrared sensor, the optical fiber passes through the gas to be measured in the light path, and then passes through the narrow-band filter to reach the infrared detector, the sensor mainly comprises the infrared light source, the light path, the infrared detector, a circuit and a software algorithm, and is mainly used for detecting hydrocarbons and the like.
Among them, patent document (CN204116223U) discloses an infrared sensor, in which, the sensor gas chamber structure is a circular channel, one side of the channel is a light source, the other side is an infrared detector, and the detector window is a filter, the light source used in the structure is a wide wavelength infrared light source, the divergence angle is generally above 100 degrees, the light emitted by the infrared light source is received by the infrared detector after multiple reflections (the reflection times are uncertain, and may be more than ten times or more than ten times) in the circular channel, but the light source utilization rate of the structure is low, the light received by the infrared detector and the reference detector respectively reach the detector after different reflection surfaces and different reflection times, the light path channel of the detector usually adopts gold plating or silver plating as the reflection surface, the reflectivity at the mid-infrared wavelength after gold plating or silver plating is generally around 90%, the light received by the light after multiple reflections is a very small portion of the light emitted by the light source for measurement, and the optical efficiency is very low.
In the prior art, a single-channel gas sensor and a double-channel gas sensor are also included.
The single-channel gas sensor integrates an infrared light source, an infrared detector and a narrow-band filter inside the sensor, the structure of a sensor air chamber is simple, the cost is low, but the long-term stability of the sensor is poor, the influence of external environments such as ambient temperature, dust and the like is large, and the single-channel gas sensor is commonly used for civil indoor air detection.
The double-channel of the double-channel gas sensor is characterized in that a reference channel is integrated on the basis of a single channel, the sensor comprises two groups of narrow-band filters and two infrared detectors, the sensor for detecting methane gas is taken as an example, a channel with the central wavelength of 3.3 mu m is sensitive to the methane gas, a channel with the central wavelength of 3.9 micrometers is additionally arranged, the channel staggers the absorption waveband of the methane, and a signal is stable and is taken as the reference channel. The dual-channel air chamber sensor has good long-term stability and small influence by the ambient temperature, the dual channels relatively eliminate the influence of the reflection light coefficient and the light source aging of the inner wall of the air chamber, and the dual-channel air chamber sensor can be used in relatively severe environment, but has the defects of complex structure and high cost, and can not fundamentally solve the problems of sensor drift, misinformation and the like caused by dust, reflection surface aging and the like.
Disclosure of Invention
In order to integrate a reflection light path, reduce reflection times, increase an optical path in a smaller space, eliminate zero drift caused by light source aging and avoid range change and false alarm caused by reflection surface aging, the invention provides a gas sensor with low power consumption, and the specific technical scheme is as follows.
A low-power-consumption gas sensor comprises a light source, a collimating lens, a first reflector, a second reflector, a third reflector, a wedge-shaped reflector, a first infrared detector, a second infrared detector and a signal processor, wherein infrared light emitted by the light source is rectified into parallel light beams by the collimating lens, the parallel light beams are reflected by the first reflector, the second reflector and the third reflector in sequence, reflected light of the third reflector enters the wedge-shaped reflector from edges, and the reflected light is divided into detection light beams and reference light beams with opposite irradiation directions after passing through the wedge-shaped reflector; the first infrared detector is provided with a detection optical filter in the incident direction, the second infrared detector is provided with a reference optical filter in the incident direction, and the signal processor processes signals received by the first infrared detector and the second infrared detector to obtain gas concentration information.
Preferably, the first reflector and the second reflector are plane mirrors, and the third reflector is a concave spherical reflector.
It is also preferable that the reflected light reflected by the third reflecting mirror is condensed into a spot beam.
Preferably, the first reflector, the second reflector and the third reflector are plane mirrors, and a condensing lens is further disposed on a light path between the third reflector and the wedge-shaped reflector.
It is also preferable that the reflected light is condensed into a spot beam after passing through a condenser lens.
Further preferably, the light source is an infrared LED light source, and the divergence angle of the light source is greater than 100 degrees; the light source is connected with the driving circuit, and the driving circuit controls the light source to emit pulsed light.
Further preferably, the collimating lens is a condensing lens, and an antireflection film for the detection wavelength and an antireflection film for the reference wavelength are plated on the surface of the condensing lens.
More preferably, the gas sensor is a methane sensor, the detection filter is a filter that transmits light with a wavelength of 3.33 μm, and the reference filter is a filter that transmits light with a wavelength of 3.9 μm.
It is further preferred that the first mirror, the second mirror, and the third mirror are disposed in opposition, and that the first mirror, the second mirror, and the third mirror are disposed in a staggered configuration within the gas chamber of the sensor.
It is further preferable that the first infrared detector and the second infrared detector convert the received optical signal into an electrical signal, and the electrical signal is transmitted to the signal processor through the processing circuit.
The gas sensor with low power consumption provided by the invention has the beneficial effects that:
(1) the low-power-consumption gas sensor light source emits infrared pulse light beams, the light source emits light in a pulse mode, the duty ratio is about 0.005, and stable measurement of the sensor can be achieved; the divergence angle of the light beam is converted into parallel light from more than 100 degrees, the parallel light is finally converged into a point light beam after passing through the concave spherical reflector or the condenser lens, the optical efficiency is high, and a low-power infrared light source can be used, so that low power consumption can be realized.
(2) The sensor integrated reflection light path adopts a plane mirror or a combination mode of the plane mirror and a spherical mirror, wherein the number of the plane mirrors is larger than that of the concave mirrors. The multiple reflection structure adopts small-angle dislocation assembly, so that a small space and a long optical path can be realized; the number of reflections is reduced to reduce the optical energy loss caused by the reflecting surface.
(3) The detection light path and the reference light path of the sensor are the same light path before passing through the wedge-shaped mirror, and the same light path can perfectly eliminate the zero drift phenomenon caused by the aging of a light source and can also eliminate the problems of range change and false alarm caused by the aging of a gold-plated or silver-plated reflecting surface.
Drawings
FIG. 1 is a schematic view of a gas sensor with low power consumption in example 1;
FIG. 2 is a schematic view of a gas sensor with low power consumption in embodiment 2;
FIG. 3 is a schematic cross-sectional view of a gas sensor with low power consumption;
in the figure: the device comprises a light source 1, a collimating lens 2, a first reflector 3, a second reflector 4, a third reflector 5, a wedge reflector 6, a first infrared detector 7, a second infrared detector 8, a signal processor 9, a detection filter 10, a reference filter 11, a driving circuit 12 and a condensing lens 13.
Detailed Description
A gas sensor with low power consumption according to an embodiment of the present invention will be described with reference to fig. 1 to 3.
Example 1
The gas sensor with low power consumption eliminates measurement errors by arranging a fixed light path, improves the optical efficiency and realizes low-power consumption detection. The device comprises a light source 1, a collimating lens 2, a first reflector 3, a second reflector 4, a third reflector 5, a wedge-shaped reflector 6, a first infrared detector 7, a second infrared detector 8 and a signal processor 9. The infrared light emitted by the light source 1 is rectified into parallel light beams by the collimating lens, the parallel light beams are reflected by the first reflector 3, the second reflector 4 and the third reflector 5 in sequence, finally the reflected light of the third reflector is incident into the wedge-shaped reflector from the edge, and the optical energy loss caused by the reflecting surface can be reduced by adopting less reflection times (less than or equal to 3 times). The reflected light is equally divided into a detection light beam and a reference light beam with opposite irradiation directions after passing through the wedge-shaped reflector 6, and because the detection light path and the reference light path are the same light path before passing through the wedge-shaped reflector, the same light path can eliminate the zero drift phenomenon caused by the aging of a light source and can also eliminate the problems of range change and misinformation caused by the aging of a reflecting surface. The first reflector 3 and the second reflector 4 are plane mirrors, the third reflector 5 is a concave spherical reflector, and the concave spherical reflector can be a reflecting surface formed by gold plating or silver plating after a concave spherical surface is processed on the basis of metal, so that reflected light reflected by the third reflector is converged into a point beam, and the optical efficiency is improved.
The first infrared detector 7 and the second infrared detector 8 convert the received optical signals into electrical signals, and the electrical signals are transmitted to the signal processor 9 through the processing circuit, wherein the first infrared detector and the second infrared detector may be photodiodes with corresponding wavelengths. The first infrared detector 7 is provided with a detection filter 10 in the incident direction to allow the light with the detection wavelength to penetrate, the second infrared detector 8 is provided with a reference filter 11 in the incident direction to allow the light with the reference wavelength to penetrate, and the signal processor 9 processes the signals received by the first infrared detector and the second infrared detector to obtain gas concentration information; and the positions of the first infrared detector and the second infrared detector can be interchanged. The light source 1 may be an infrared LED light source with a divergence angle greater than 100 degrees. The light source 1 is connected with the driving circuit 12, the driving circuit 12 controls the light source to emit pulsed light, and the duty ratio of the pulsed light is about 0.005, so that stable measurement of the sensor can be realized. The light source 1 may also emit infrared light at a wavelength near the absorption peak of the gas to be detected and at a reference wavelength.
The collimating lens 2 is a condensing lens, an antireflection film for detecting wavelength and an antireflection film for reference wave wavelength are plated on the surface of the condensing lens, and the utilization rate of the light source is improved by collimating the integrated light path; the collimating lens 2 can be made of glass which can transmit infrared light, including but not limited to silicon, zinc selenide, calcium fluoride and the like, and is coated with an antireflection film on the surface. The first reflector 3 and the second reflector 4 are oppositely arranged, and the second reflector 4 and the third reflector 5 are oppositely arranged, so that the optical path reflected by the optical path is ensured. The first reflector 3, the second reflector 4 and the third reflector 5 are arranged in the air chamber of the sensor in a staggered mode, and can be staggered up and down or staggered left and right. The reflector may be metal or glass based and gold or silver plated as the reflective surface.
Example 2
As shown in fig. 2, another gas sensor with low power consumption is provided, which includes a light source 1, a collimating lens 2, a first reflector 3, a second reflector 4, a third reflector 5, a wedge-shaped reflector 6, a first infrared detector 7, a second infrared detector 8 and a signal processor 9, wherein infrared light emitted from the light source is collimated into parallel light beams by the collimating lens, the parallel light beams are reflected by the first reflector 3, the second reflector 4 and the third reflector 5 in sequence, and reflected light of the third reflector 5 is incident into the wedge-shaped reflector from an edge. The first reflector 3, the second reflector 4 and the third reflector 5 are plane mirrors, a condensing lens 13 is further arranged on a light path between the third reflector 5 and the wedge-shaped reflector 6, and reflected light is converged into a point light beam after passing through the condensing lens. The reflected light is equally divided into the detection light beam and the reference light beam with opposite irradiation directions after passing through the wedge-shaped reflector 6, and the detection light path and the reference light path are the same light path before passing through the wedge-shaped reflector, so that the detection of the detection light path can be corrected through the parameters of the reference light path even if the light source emits aging or the reflector is aged, and the sensor can realize low-power consumption, high-efficiency and high-precision detection.
The first infrared detector 7 and the second infrared detector 8 convert the received optical signals into electrical signals, and the electrical signals are transmitted to the signal processor through the processing circuit. The first infrared detector 7 is provided with a detection optical filter in the incident direction to allow light with detection wavelength to penetrate, the second infrared detector 8 is provided with a reference optical filter in the incident direction to operate light with reference wavelength to penetrate, and the signal processor processes signals received by the first infrared detector 7 and the second infrared detector 8 to obtain gas concentration information; and the signal processor also corrects the detection result of the gas sensor based on the detection of the second infrared detector 8.
In addition, the light source 1 is an infrared LED light source, and the divergence angle of the light source is larger than 100 degrees. The light source is connected with the driving circuit, and the driving circuit controls the light source to emit pulsed light. The first infrared detector 7 and the second infrared detector 8 convert the received optical signals into electrical signals, and the electrical signals are transmitted to the signal processor 9 through the processing circuit. The collimating lens 2 is a condensing lens, the surface of the condensing lens is plated with an antireflection film with a detection wavelength and an antireflection film with a reference wavelength, wherein the light source can be arranged near the focus position of the collimating lens. The first reflector 3 and the second reflector 4 are oppositely arranged, and the second reflector 4 and the third reflector 5 are oppositely arranged, so that the optical path reflected by the optical path is ensured. The first reflector 3, the second reflector 4 and the third reflector 5 are arranged in the air chamber of the sensor in a staggered mode, and can be staggered up and down or staggered left and right. The reflector may be metal or glass based and gold or silver plated as the reflective surface.
Example 3
In addition to embodiment 1 or embodiment 2, there is provided a methane gas sensor with low power consumption, wherein the gas sensor is a methane sensor, a detection filter is a filter for transmitting a 3.33 μm wavelength, and a reference filter is a filter for transmitting a 3.9 μm wavelength. The gas sensor utilizes the absorption of gas molecules to infrared light with specific wavelength, the absorption relation of the gas sensor obeys the principle of Lambert beer absorption law, and the concentration of different gases is measured through the change of light intensity. The gas sensor was an isobutane sensor, and a detection filter was a 3.375 μm wavelength transmission filter, and a reference filter was a 3.9 μm wavelength transmission filter.
A specific structure of the gas sensor with low power consumption may be as shown in fig. 3. The multiple reflection structure adopts a small-angle dislocation assembly mode, so that a long optical path can be ensured in a small space of the air chamber; the reflection light path adopts a mode of plane mirrors or combination of plane mirrors and spherical mirrors, and the number of the plane mirrors is larger than that of the concave mirrors. The low-power-consumption gas sensor reduces the loss of light in the inner cavity of the sensor through optical design, finally solves the zero drift problem of the traditional sensor caused by device aging and external environment influence by adopting a pulse light-emitting method with very low duty ratio, improves the overall optical utilization rate of the sensor, and can stably finish gas detection for a long time without the device aging and external environment influence.
The principle of gas concentration detection is specifically as follows: the light source emits pulsed light under the control of the driving circuit, the light is condensed by the collimating lens and then converted into approximately parallel light beams, and the light source is generally positioned near the focus of the collimating lens. After the parallel light beams are reflected by the plane reflector, a light beam path which is long enough is formed, so that the detection range is enough, when the measurement gas passes through the light beam path, the light rays can be absorbed by the gas, and the absorption rule accords with the Lambert beer law; the reflected light can be converged into light spots through condensation, the diameter of each light spot is generally smaller than 3mm, the light after condensation vertically irradiates on the wedge-shaped reflector, and the light is divided into two parts through the wedge-shaped reflector. One of the light beams is divided into the infrared detector for detecting gas through the detection filter, the other light beam is divided into the infrared detector for detecting reference wavelength through the reference filter, and the positions of the infrared detector for detecting gas and the infrared detector for detecting reference wavelength can be interchanged. The optical signals received by the infrared detector for detecting the gas and the infrared detector with the reference wavelength are converted into electric signals, and the detected gas concentration information is obtained after the electric signals pass through the signal processing circuit.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A low-power-consumption gas sensor is characterized by comprising a light source, a collimating lens, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a wedge-shaped reflecting mirror, a first infrared detector, a second infrared detector and a signal processor, wherein infrared light emitted by the light source is rectified into parallel light beams through the collimating lens, the parallel light beams are reflected by the first reflecting mirror, the second reflecting mirror and the third reflecting mirror in sequence, reflected light of the third reflecting mirror enters the wedge-shaped reflecting mirror from edges, and the reflected light is divided into detection light beams and reference light beams in opposite irradiation directions after passing through the wedge-shaped reflecting mirror; the first infrared detector is provided with a detection optical filter in the incident direction, the second infrared detector is provided with a reference optical filter in the incident direction, and the signal processor processes signals received by the first infrared detector and the second infrared detector to obtain gas concentration information.
2. The gas sensor of claim 1, wherein the first and second reflectors are flat mirrors and the third reflector is a concave spherical reflector.
3. A low power consumption gas sensor as claimed in claim 2, wherein the reflected light from the third mirror is collected as a spot beam.
4. The gas sensor of claim 1, wherein the first reflector, the second reflector and the third reflector are flat mirrors, and a condensing lens is disposed on an optical path between the third reflector and the wedge reflector.
5. The gas sensor with low power consumption as claimed in claim 4, wherein the reflected light is converged into a point beam after passing through the condensing lens.
6. A low power consumption gas sensor as claimed in claim 3 or 5, wherein the light source is an infrared LED light source, the divergence angle of the light source being greater than 100 degrees; the light source is connected with the driving circuit, and the driving circuit controls the light source to emit pulsed light.
7. The gas sensor of claim 3 or 5, wherein the collimating lens is a condensing lens, and the surface of the condensing lens is coated with an anti-reflection film for detecting wavelength and an anti-reflection film for reference wavelength.
8. A low power consumption gas sensor as claimed in claim 3 or 5, wherein the gas sensor is a methane sensor, the detection filter is a 3.33 μm wavelength transmission filter and the reference filter is a 3.9 μm wavelength transmission filter.
9. A low power consumption gas sensor according to claim 3 or 5, wherein the first, second and third mirrors are oppositely disposed, and the first, second and third mirrors are arranged alternately in the gas chamber of the sensor.
10. A low power consumption gas sensor as claimed in claim 3 or 5, wherein the first and second infrared detectors convert received optical signals into electrical signals, which are transmitted to the signal processor via the processing circuitry.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986190A (en) * | 2021-02-24 | 2021-06-18 | 中国科学院长春光学精密机械与物理研究所 | Reflectivity measuring device |
| CN113155769A (en) * | 2021-03-18 | 2021-07-23 | 重庆科技学院 | Tunable spectrum-based variable optical path gas chamber component detection system and method |
| CN113514408A (en) * | 2021-06-28 | 2021-10-19 | 杭州谱育科技发展有限公司 | Ozone detection device with correction function and method |
| CN114002310A (en) * | 2021-11-03 | 2022-02-01 | 江苏舒茨测控设备股份有限公司 | Paramagnetic oxygen sensor with shock resistance |
| CN115096840A (en) * | 2022-07-01 | 2022-09-23 | 深圳市诺安智能股份有限公司 | Automatic zero calibration multi-gas sensor and automatic zero calibration method |
| WO2023272892A1 (en) * | 2021-06-30 | 2023-01-05 | 广东感芯激光科技有限公司 | Photoelectric gas sensor probe and photoelectric gas detection device |
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