CN106990065B - Non-spectroscopic infrared gas sensor for multi-region and multi-gas measurement - Google Patents
Non-spectroscopic infrared gas sensor for multi-region and multi-gas measurement Download PDFInfo
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- CN106990065B CN106990065B CN201710366601.8A CN201710366601A CN106990065B CN 106990065 B CN106990065 B CN 106990065B CN 201710366601 A CN201710366601 A CN 201710366601A CN 106990065 B CN106990065 B CN 106990065B
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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
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G05B19/0423—Input/output
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- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
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- 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
- G01N2021/3129—Determining multicomponents by multiwavelength light
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a non-spectroscopic infrared gas sensor for multi-region and multi-gas measurement, which comprises a sensitive probe, a signal conditioning circuit and a control circuit; the sensitive probe comprises a detection air chamber, an infrared light source, a light collecting piece, M optical filter arrays, an infrared detector array and a rotating disk; the detection air chamber comprises a frame and a reflecting mirror arranged on the inner wall surface of the frame, a support is arranged in the center of the support, and the top end of the support is connected with the rotating disk; the signal conditioning circuit comprises a signal amplifier, a signal filter connected with the output end of the signal amplifier and a power amplifier connected with the output end of the signal filter, and the input end of the signal amplifier is connected with the output end of the infrared detector; the control circuit comprises an AD converter connected with the output end of the power amplifier, a signal isolator connected with the output end of the AD converter and a singlechip. The invention has small volume, low power consumption, good performance and high integration, and can be used for measuring various areas and various infrared gases.
Description
Technical Field
The invention relates to a non-spectroscopic infrared gas sensor for multi-region and multi-gas measurement, belonging to the technical field of gas sensors.
Background
The application range of the gas detection technology in life and production is wider and wider, and the gas detection technology is particularly concentrated on aspects of mine exploration, air pollution monitoring, chemical industry monitoring, wastewater treatment devices and the like. The mine exploration comprises the steps of exploration of petroleum and coal gas, transportation, storage and refining, and a large amount of inflammable and toxic gas can be generated, so that the gas detection is often applied to occasions such as exploration drilling, production platforms, coal gas end stations and the like; the existing air pollution is serious, and the air quality index of the human living environment can be timely and accurately monitored by the gas detection technology, and urban air pollution condition forecast is provided; chemical plants are one of the largest users of gas detection equipment, and various inflammable and toxic gases are generated in the production process, so gas detection technology is often applied to process areas, laboratories and the like; wastewater treatment devices are common in many cities and towns, sewage contains methane and hydrogen sulfide, and hydrogen sulfide gas can be controlled by a gas detection technology. Therefore, the development of gas sensors is increasingly emphasized.
Currently, gas sensors can be classified into semiconductor gas sensors, electrochemical gas sensors, solid electrolyte gas sensors, catalytic combustion gas sensors, optical gas sensors, and the like according to gas sensitive materials and effects thereof. The semiconductor gas sensor has the advantages of low cost, simple manufacture, high sensitivity, high response speed, long service life, low sensitivity to humidity, simple circuit and the like, but the semiconductor gas sensor must work at high temperature, and has poor stability and high power; electrochemical gas sensors are divided into a primary cell type requiring no power supply and a controllable potential electrolysis type requiring power supply, and can detect a plurality of toxic gases and oxygen, and have the main advantages of high sensitivity and good selectivity of the gases, and short service life (generally two years). A solid electrolyte gas sensor is a gas sensor interposed between a semiconductor and an electrochemical, which has selectivity and sensitivity higher than those of the semiconductor, and has a long life, and thus can be applied to various aspects, which has a disadvantage of excessively long response time. The catalytic combustion type sensor belongs to a high-temperature gas sensor, and has the advantages of simple structure, low production and manufacturing cost, no influence of water vapor on the output of the sensor, insensitivity to the influence of temperature and humidity of the environment, lower service life, higher working temperature (the internal temperature can reach 700-800 ℃), and larger error of detecting an indication value in an anoxic environment. The optical gas sensor mainly takes the infrared absorption type, and the infrared absorption wavelength is usually measured to detect the gas due to different absorption degrees of different gases on infrared waves, so that the cost is quite high at present due to the structural relation.
However, in the gas detection process, the conventional infrared absorption gas sensor can only detect a single gas concentration, and for measuring multiple gases, the detection system is complex in structure and large in volume, and can be completed only by utilizing a fourier analyzer and multiple semiconductor lasers with different wavelengths or switching multiple filters. In addition, the existing infrared absorption type gas sensor cannot measure different places, and in addition, the sensors are difficult to integrate and have high cost, so that the sensors cannot be fully marketed. There is a greater need in the market for a more sophisticated, low cost, and more practical gas sensor, and in view of this, there is a need for an improvement over existing infrared gas sensors to address the above-mentioned problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a non-spectroscopic infrared gas sensor which has small volume, low power consumption, good performance and high integration and is used for measuring multiple areas and multiple gases.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the invention relates to a non-spectroscopic infrared gas sensor for multi-region and multi-gas measurement, which comprises a sensitive probe, a signal conditioning circuit and a control circuit; the sensitive probe comprises a detection air chamber, an infrared light source arranged at one end of the detection air chamber, a light collecting sheet arranged at the emitting end of the infrared light source, M optical filter arrays, an infrared detector array and a rotary disk, wherein an air inlet and an air outlet are arranged on the detection air chamber, a plurality of identifiers are arranged on the rotary disk, resistors with different resistance values are arranged in each identifier, and when the rotary disk rotates to the set identifier, a rotary disk lead wire on the rotary disk is connected into the singlechip; the detection air chamber comprises a frame and a reflecting mirror arranged on the inner wall surface of the frame, and the optical filter array, the infrared detector array and the rotating disk are sequentially arranged on the frame at the emitting end of the infrared light source; the optical filter array comprises N optical filters and a bracket used for connecting the optical filters, and the infrared detector array comprises N infrared detectors; a support column is arranged in the center of the support, and the top end of the support column is connected with the rotating disc; the signal conditioning circuit comprises a signal amplifier, a signal filter connected with the output end of the signal amplifier and a power amplifier connected with the output end of the signal filter, and the input end of the signal amplifier is connected with the output end of the infrared detector; the control circuit comprises an AD converter connected with the output end of the power amplifier, a signal isolator connected with the output end of the AD converter and a singlechip; the output end of the rotating disk and the output end of the signal isolator are connected with the input end of the singlechip, wherein M, N is a positive integer.
The optical filter arrays are specifically provided with three optical filters, and each optical filter array is specifically provided with four optical filters; and each filter array takes a central point as an intersection point, and the included angle between two adjacent filter arrays is 60 degrees.
The length of each optical filter is equal to the length of the interval between two adjacent optical filters.
Three filters in each filter array are detection filters, and the other filter is a contrast filter.
The M optical filter arrays are arranged on a disc, and one surface of the disc, which faces the detection air chamber, is a reflecting surface.
And rotating the rotating disc, wherein each infrared detector is opposite to one optical filter when the arrow direction on the identifier is aligned with the alignment identifier on the frame.
The infrared light source is an LED infrared light source with the wavelength range of 1-20 mu m.
The condensing sheet is an optical glass LED condensing lens which is used for converging infrared light emitted by an infrared light source into a beam of parallel light.
The optical filter is a bandpass optical filter; the infrared detector is a pyroelectric infrared sensor.
The AD converter adopts AD7195; the signal isolator is an ADuM5401 digital isolator; the singlechip adopts STM32F407.
(1) The infrared gas sensor for measuring the multiple areas adopts an array mode, compares and analyzes the intensity differences of infrared light with multiple characteristic wavelengths to calculate the concentration of multiple gases, and has high integration degree.
(2) The infrared gas sensor for measuring in multiple areas adopts a reflection mode, and increases the optical path, so that the change of the light intensity of infrared light in a specific wave band is more obvious.
(3) The multi-region measuring infrared gas sensor adopts a rotary disk mode, and can measure multi-gas concentration in different regions by only controlling the rotary disk to replace the optical filter array.
(4) The infrared gas sensor for measuring the multiple areas adopts a comparison mode, and the infrared absorption peak light intensity of the detected gas and the infrared light intensity corresponding to the comparison filter are subjected to comparison analysis, so that the detection result is more accurate.
(5) The multi-region measurement infrared gas sensor has the advantages of simple process, low cost, compatibility with CMOS process, integration of signal detection, conditioning and processing circuits, and accordance with the development trend of sensor miniaturization, array and intellectualization.
Drawings
FIG. 1 is a cross-sectional view of a sensor of the present invention;
FIG. 2 is a diagram of a filter array of the present invention;
FIG. 3 is a diagram of a rotating disk of the present invention;
FIG. 4 is a diagram of an infrared detector array of the present invention;
FIG. 5 is a block diagram of a circuit testing system of the present invention;
the reference numerals in the drawings: 1. an infrared light source, a light collecting sheet, an air inlet, a frame, a detection air chamber, an infrared detector lead, a rotary disk and a rotary disk, 9, reflector 10, filter 11, support 12, gas outlet 13, rotary disk lead, 14, identifier, 15, alignment identifier.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Referring to fig. 1 to 5, in the present embodiment, the infrared gas sensor includes an ac power supply, a sensing probe, a signal conditioning circuit, and a control circuit, which are sequentially connected.
The sensitive probe comprises an infrared light source 1, a light condensing sheet 2, an air inlet 3, a frame 4, a detection air chamber 5, an infrared detector 6, an infrared detector lead 7, a rotary disk 8, a reflecting mirror 9, an optical filter 10, a bracket 11, an air outlet 12, a rotary disk lead 13, an identifier 14 and an alignment identifier 15.
The groove end of the detection air chamber 5 and the infrared light source 1 is provided with an air inlet 3, and the right end of the detection air chamber 5 is provided with an air outlet 12. The infrared light source 1 is arranged at the left end of the detection air chamber 5, and the frame 4 at the emergent end of the infrared light source 1 is of a cylindrical structure, so that emergent light is parallel light as much as possible.
The infrared light source 1 is electrified to radiate infrared light with the wavelength range of 1-20 mu m outwards, the infrared light is converged into a beam of parallel light after passing through the light-converging sheet 2, and the parallel light is reflected in the detection air chamber 5 for multiple times to reach the filter array.
Wherein, the infrared light source 1 is an LED infrared light source, and the light source is electrified. The wide-spectrum infrared light is radiated outwards, the wavelength range is 1-20 mu m, and the requirement of the instrument on the infrared light wavelength range is met.
The condensing sheet 2 is an optical glass LED condensing lens, and the lens condenses divergent infrared light emitted by the LED infrared light source into a beam of parallel light.
The detection air chamber 5 is in a cuboid structure, the inner wall surfaces of the air chamber are provided with reflecting mirrors 9, and parallel light emitted by the infrared light source 1 and converged by the light condensing sheet 2 is reflected back and forth in the detection air chamber 5 for multiple times and then reaches the optical filter 10.
The optical filters 10 are arranged on a disc in an array mode, the optical filters 10 are divided into three optical filter arrays, each array is provided with four optical filters 10, the length of each optical filter 10 is equal to the length of the interval between the optical filters 10, so that the optical filters 10 just reach the next optical filter 10 after being reflected on the optical filters 10, each interval section is connected by a bracket 11, the center point of each array is used as an intersection point, and the included angle of each array is 60 degrees.
The three filters 10 in each filter array are detection filters, and the other is a contrast filter, that is, the detection filter can pass through an infrared absorption peak of the corresponding three gases, and the contrast filter can pass through infrared light of a wave band, and the infrared light is not absorbed by the gases.
The other parts of the disc where the three optical filter arrays are positioned are made of metal materials, and one surface of the material, which faces the air chamber, is a reflecting surface.
The filter 10 is a bandpass filter, and the filter 10 transmits infrared light of a desired detection wavelength and reflects infrared light of other wavelength bands.
The center of the disc arranged in the optical filter array is connected with a support column, and the upper end of the support column is connected with a rotary disc 8 for rotationally controlling the optical filter array.
The infrared detectors 6 are in an array form, and four detectors are fixed on the upper frame 4 of the air chamber, and each detector faces one optical filter 10.
Wherein the infrared detector 6 is pyroelectric.
The infrared light emitted by the infrared light source 1 passes through the detection air chamber 5, is emitted to the infrared detector 6 after passing through the optical filter 10, forms transmission spectrums with different characteristics according to the components and the concentration of the gas in the passing air chamber, reflects the concentration of the gas when the absorption peak intensity on the transmission spectrums changes, converts a current signal into a digital signal by using the AD converter, and calculates the concentration of the gas according to the change of the signal.
Wherein, AD7195 is adopted to AD converter.
Wherein, the signal isolator adopts an ADuM5401 digital isolator.
Wherein, the singlechip adopts STM32F407.
The signal conditioning circuit includes a signal amplifier, a signal filter, and a power amplifier.
The control circuit comprises an AD converter, a signal isolator, a singlechip, an LDO linear power supply and a USB interface.
The infrared detector lead wire is connected with the signal amplifier, the output end of the signal isolator is connected with the input end of the singlechip, and the rotating disk lead wire 13 is connected with the singlechip.
The specific working procedure of this embodiment is as follows:
turning on the power to rotate the rotary disk 8 of the device to the area of the chemical factory name to align the chemical factory name identifier 14 with the alignment identifier 15, the corresponding filter arrays are SO sequentially from left to right 2 Is a narrow band pass filter of CO, a narrow band pass filter of NO, a contrast filter, SO 2 An absorption peak of 8.7 μm is selected in the infrared band, an absorption peak of 4.65 μm is selected in the infrared band for CO, an absorption peak of 5.3 μm is selected in the infrared band for NO, and infrared light with a wavelength of 18 μm is selected in the infrared band for the contrast filter. Placing the device at SO with known concentration 2 In CO and NO gases, after the gas to be detected is filled in the detection gas chamber 5 through the gas inlet and outlet 12, infrared light emitted by the infrared light source 1 is absorbed by the gas in the detection gas chamber 5 in the process of being reflected by the detection gas chamber 5, so that the light intensity is changed, the light intensity change of the absorption peak wave band of the gas is particularly obvious, after the infrared light passes through the optical filter 10, infrared light with specific wavelength reaches the infrared detector 6, infrared radiation detected and received by the detector element is converted into weak current signals, the weak current signals are amplified by the field effect tube arranged in the probe and then are output outwards, the current signals are converted into digital signals through the AD converter, the corresponding digital signals are recorded through the conditioning circuit, in addition, the infrared light intensity of 18 mu m passing through the contrast optical filter reaches the infrared detector 6, the infrared radiation detected and received by the detector element is converted into weak current signals, the weak current signals are amplified by the field effect tube arranged in the probe and then are output outwards, the signal conditioning circuit is used for carrying out signal conditioning, the current signals are converted into digital signals through the AD converter, and the corresponding digital signals are recorded. Is bigger thanMeasurement of the amount of SO at different concentrations is known 2 The CO and NO gases are compared with the digital signals obtained by the comparison filter to obtain the change of the digital signals, and the SO is obtained according to the change of the digital signals 2 Fitting curve relation between CO and NO gas concentration and digital signal change. Similarly, the rotary disk 8 is rotated to the area of the names "waste water works" and "mines", and is calibrated.
When the unknown gas concentration detection of a certain chemical plant is carried out, the power supply is turned on to rotate the rotary disk 8 of the device to the area of the name of the chemical plant, so that the identifier 14 of the name of the chemical plant is aligned with the alignment identifier 15, and the lead on the rotary disk 8 is connected with the singlechip, so that the singlechip is adjusted to the detection mode of the chemical plant. Through the air inlet 3 and the air outlet 12, the detection air chamber 5 is filled with the air to be detected, the infrared light source 1 is connected, the infrared light emitted by the infrared light source 1 is converged by the condensing sheet 2, and is emitted to the infrared detector array through the optical filter array after being continuously emitted by the air chamber, the infrared light detected by the infrared detector 6 is converted into weak current signals after being detected by the optical filter 10, the weak current signals are amplified by the field effect tube in the probe and are output outwards, the signals are conditioned by the conditioning circuit, the current signals are converted into digital signals through the AD converter, and then SO in the detection air chamber 5 is calculated according to the change of the digital signals 2 Concentration of CO, NO gas.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The non-spectroscopic infrared gas sensor for multi-region and multi-gas measurement is characterized by comprising a sensitive probe, a signal conditioning circuit and a control circuit;
the sensitive probe comprises a detection air chamber (5), an infrared light source (1) arranged at one end of the detection air chamber (5), a light condensing sheet (2) arranged at the emitting end of the infrared light source (1), M optical filter arrays, an infrared detector array and a rotary disk (8), wherein an air inlet (3) and an air outlet (12) are arranged on the detection air chamber (5), a plurality of identifiers (14) are arranged on the rotary disk (8), resistors with different resistance values are arranged in each identifier (14), and when the rotary disk (8) rotates to the set identifiers (14), a rotary disk lead (13) on the rotary disk (8) is connected into the singlechip;
the detection air chamber (5) comprises a frame (4) and a reflecting mirror (9) arranged on the inner wall surface of the frame (4), and the optical filter array, the infrared detector array and the rotating disk (8) are sequentially arranged on the frame (4) at the emergent end of the infrared light source (1); the optical filter array comprises three optical filter arrays, each array is provided with four optical filters, the length of each optical filter is equal to the length of the interval between the optical filters, so that the optical filters just reach the next optical filter after being reflected on the optical filters, each interval section is connected by a bracket, each array takes the center point of the array as an intersection point, and the included angle of each array is 60 degrees;
the three filters in each filter array are detection filters, and the other filter is a contrast filter, namely the detection filter passes through one infrared absorption peak of the corresponding three gases, the contrast filter passes through infrared light of a wave band, and the infrared light is not absorbed by the gases;
the infrared detector array comprises four infrared detectors (6), the four infrared detectors are fixed on an upper frame (4) of the air chamber, and each infrared detector faces to an optical filter (10); a support column is arranged in the center of the support (11), and the top end of the support column is connected with the rotating disc (8);
the signal conditioning circuit comprises a signal amplifier, a signal filter connected with the output end of the signal amplifier and a power amplifier connected with the output end of the signal filter, and the input end of the signal amplifier is connected with the output end of the infrared detector (6);
the control circuit comprises an AD converter connected with the output end of the power amplifier, a signal isolator connected with the output end of the AD converter and a singlechip;
the output end of the rotary disk (8) and the output end of the signal isolator are connected with the input end of the singlechip;
the three filter arrays are arranged on a disc, and one surface of the disc, which is opposite to the detection air chamber (5), is a reflecting surface.
2. A non-spectroscopic infrared gas sensor for multi-area and multi-gas measurement according to claim 1, characterized in that the rotating disc (8) is rotated, each of the infrared detectors (6) facing one of the filters (10) when the arrow direction on the identifier (14) is aligned with the alignment identifier (15) on the frame (4).
3. The non-spectroscopic infrared gas sensor for multi-area and multi-gas measurement according to claim 1, wherein the infrared light source (1) is specifically an LED infrared light source, and the wavelength range thereof is 1-20 μm.
4. The non-spectroscopic infrared gas sensor for multi-area and multi-gas measurement according to claim 1, wherein the condensing sheet (2) is specifically an optical glass LED condensing lens, and is configured to condense infrared light emitted by the infrared light source (1) into a beam of parallel light.
5. Non-spectroscopic infrared gas sensor for multi-region and multi-gas measurement according to claim 1, characterized in that the filter (10) is in particular a bandpass filter; the infrared detector (6) is a pyroelectric infrared sensor.
6. The non-spectroscopic infrared gas sensor for multi-regional and multi-gas measurement of claim 1, wherein the AD converter employs AD7195; the signal isolator is an ADuM5401 digital isolator; the singlechip adopts STM32F407.
Priority Applications (1)
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| CN108195788B (en) * | 2018-03-13 | 2023-12-08 | 南京信息工程大学 | Sulfur dioxide gas sensor and temperature and humidity correction method thereof |
| CN108489924A (en) * | 2018-03-13 | 2018-09-04 | 南京信息工程大学 | A kind of sensing probe and non-dispersive infrared gas sensor detecting system |
| CN108709868A (en) * | 2018-08-17 | 2018-10-26 | 青岛海纳光电环保有限公司 | A kind of infrared gas sensor and infrared gas detection device |
| CN109085303A (en) * | 2018-08-29 | 2018-12-25 | 安徽星源环境科技有限公司 | A kind of stand alone type imflammable gas detection device |
| CN109191759A (en) * | 2018-11-09 | 2019-01-11 | 江苏弘冉智能科技有限公司 | A kind of intelligence beam type gas characteristic spectrum fire detector |
| CN109682772B (en) * | 2019-02-27 | 2020-11-10 | 中国科学院半导体研究所 | Non-spectroscopic infrared gas sensor |
| CN113588586A (en) * | 2021-08-10 | 2021-11-02 | 南京信息工程大学 | STM 32-based multi-component gas concentration detection system and method |
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