CN106990065A - A kind of non-spectral formula infrared gas sensor for how regional and many gasmetries - Google Patents
A kind of non-spectral formula infrared gas sensor for how regional and many gasmetries Download PDFInfo
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- CN106990065A CN106990065A CN201710366601.8A CN201710366601A CN106990065A CN 106990065 A CN106990065 A CN 106990065A CN 201710366601 A CN201710366601 A CN 201710366601A CN 106990065 A CN106990065 A CN 106990065A
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- G—PHYSICS
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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
- G01N21/17—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
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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
- 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
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- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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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
- G01N21/17—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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Abstract
The invention discloses a kind of non-spectral formula infrared gas sensor for how regional and many gasmetries, including sensing probe, signal conditioning circuit and control circuit；Sensing probe includes detection air chamber, infrared light supply, concentration piece, M filter arrays, infrared detector array and rotating disk；Detect that air chamber includes framework and the speculum installed in frame inner wall face, the center of support is provided with pillar, and the top of pillar is connected with rotating disk；The power amplifier that signal conditioning circuit includes signal amplifier, the traffic filter being connected with signal amplifier output end and traffic filter output end are connected, the input of signal amplifier is connected with the output end of infrared detector；Control circuit includes the AD converter being connected with power amplifier output, the signal isolator and single-chip microcomputer that are connected with AD converter output end.Small volume of the present invention, low in energy consumption, performance are good, integrated height, can be used for measuring multiple regional and a variety of infrared-gas.
Description
Technical field
The present invention relates to a kind of non-spectral formula infrared gas sensor for how regional and many gasmetries, belong to gas
Sensor technical field.
Background technology
Gas detection technology is more and more extensive in the application lived and produced, and is specifically focused on mine exploration, air
In terms of pollution monitoring, chemical industry monitoring, wastewater treatment equipment.Mine exploration includes exploration to stone oil and gas, transport, storage
Deposit and refine, can all produce a large amount of inflammable and toxic gases, so gas detection is often applied in exploration drilling, production platform, coal
The occasions such as gas terminal；Nowadays air pollution is serious, and gas detection technology can timely and accurately monitor the sky of environment for human survival
Makings volume index, and the forecast of urban air pollution situation is provided；Chemical plant is one of maximum user of gas detection devices, at it
In production process, miscellaneous inflammability and poisonous gas can be produced, thus gas detection technology be often used in process island,
Laboratory etc.；Wastewater treatment equipment is typical in many cities and small towns, and methane and hydrogen sulfide, stink damp are contained in sewage
Body can be controlled by gas detection technology.Therefore, development of the people to gas sensor is increasingly paid attention to.
At present, gas sensor can be divided into semiconductor gas sensor, electrochemistry gas according to gas sensitive and action effect
Body sensor, solid-state electrolyte gas sensor, catalytic combustion method gas sensor, optical gas sensor etc..Semiconductor gas
Body sensor have it is with low cost, be simple to manufacture, sensitivity height, fast response time, long lifespan, and circuit low to humidity sensitive it is simple
Single the advantages of, but it must work at high temperature, stability is poor, power is high；Electrochemical gas sensor, which is divided into, is not required to power supply
Primary cell type and need power controlled potential electrolysis formula, many toxic gases and oxygen can be detected, major advantage is gas
The high sensitivity of body and good selectivity, weak point are that have short life (generally 2 years).Solid electrolyte gas is passed
Sensor is a kind of gas sensor between semiconductor and electrochemistry, and its selectivity and sensitivity are all higher than semiconductor, and
And last a long time, therefore, it is possible to be applied to many aspects, its shortcoming is that the response time is long.Catalytic combustion type sensor belongs to
High-temperature gas sensors, advantage is that simple in construction, manufacturing cost is low, and sensor output is not influenceed by vapor, to ring
The humiture influence in border is insensitive, and it has the disadvantage the life-span than relatively low, and operating temperature is higher (internal up to 700 DEG C~800 DEG C),
Detect that indicated value error is larger under anaerobic environment.Optical type gas sensor is main based on infrared absorption type, due to different gas
Body is different to infrared waves degree of absorption, is generally all to detect gas by measuring infrared absorption wavelength, at present because its knot
The general cost of structure relation is quite high.
However, conventional infrared absorption type gas sensor is during detection of gas, often can only be dense to pure gas
Degree is detected, and the measurement for multiple gases using the semiconductor of Fourier analyzer and multiple different wave lengths, it is necessary to be swashed
Light device, or switch multiple wave filters, it can complete, its detection system is not only complicated, and bulky.In addition,
Existing infrared absorption type gas sensor can not be accomplished to measure different places, and these sensors are difficult to integrated in addition
Change, cost are very high, lead to not perfect market.So market more needs technology maturation, and it is with low cost, it is more practical
Gas sensor, in view of this, it is necessary to existing infrared gas sensor is improved to solve the above problems.
The content of the invention
In view of the deficienciess of the prior art, it is an object of the present invention to provide a kind of small volume is low in energy consumption, performance is good, integrated
High is used for the non-spectral formula infrared gas sensor of how regional and many gasmetries, and the sensor uses the form of rotating disk,
Control rotating disk detects many gas concentrations of different regions to reach switching filter arrays, red under specific wavelength by analyzing
The change of outer luminous intensity determines the concentration of gas with various, and precision is high, temperature drift is small.
To achieve these goals, the present invention is to realize by the following technical solutions：
A kind of non-spectral formula infrared gas sensor for how regional and many gasmetries of the present invention, including sensitive spy
Head, signal conditioning circuit and control circuit；The sensing probe includes detection air chamber, the infrared light installed in detection air chamber one end
Source, the concentration piece for being arranged on infrared light supply transmitting terminal, M filter arrays, infrared detector array and rotating disk, the detection
Air chamber is provided with air inlet and gas outlet, and the rotating disk is provided with multiple identifiers, different resistances built in each identifier
The resistance of value, when the rotating disk turns to the identifier of setting, the rotating disk lead in the rotating disk is linked into monolithic
In machine；Detect that air chamber includes framework and the speculum installed in frame inner wall face, the filter arrays, infrared detector array
On the framework that infrared light supply exit end is successively set on rotating disk；The filter arrays include N number of optical filter and for even
The support of optical filter is connect, the infrared detector array includes N number of infrared detector；The center of the support is provided with pillar, institute
The top for stating pillar is connected with rotating disk；Signal conditioning circuit includes signal amplifier, is connected with signal amplifier output end
The power amplifier that the traffic filter connect is connected with traffic filter output end, the input of the signal amplifier with it is red
The output end of external detector is connected；Control circuit includes the AD converter being connected with power amplifier output and AD turns
Signal isolator and single-chip microcomputer that parallel operation output end is connected；The output end of rotating disk and the output end of signal isolator with list
The input of piece machine is connected, wherein, M, N are positive integer.
Above-mentioned filter arrays are specifically provided with three, and every filter arrays are specifically provided with four optical filters；And every institute
Filter arrays are stated using central point as crosspoint, the angle between adjacent two filter arrays is 60 °.
The equal length being spaced between the length and two neighboring optical filter of each optical filter.
Three optical filters in every filter arrays are detection optical filter, and another optical filter filters for contrast
Piece.
The M filter arrays are arranged on disk, and the disk is just to detecting that the one side of air chamber is reflecting surface.
Rotate the rotating disk, when the identifier upward arrow direction with framework registration mark symbol align when, Mei Gesuo
Infrared detector is stated just to an optical filter.
Above-mentioned infrared light supply specifically uses LED infrared light supplies, and its wave-length coverage is 1~20 μm.
Above-mentioned concentration piece specifically uses optical glass LED collector lenses, for the infrared light for sending infrared light supply
Pool a branch of directional light.
Above-mentioned optical filter specifically uses bandpass filter；The infrared acquisition implement body uses rpyroelectric infrared
Sensor.
Above-mentioned AD converter uses AD7195；The signal isolator uses ADuM5401 digital isolators；
The single-chip microcomputer uses STM32F407.
(1) many ground region measurement infrared gas sensor of the present invention, takes the form of array, the multiple spies of comparative analysis
Levy the intensity difference of IR wavelengths to calculate the concentration of multiple gases, integration degree is high.
(2) many ground region measurement infrared gas sensor of the present invention, takes the form of reflection, increases light path so that
The infrared light light intensity change of specific band becomes apparent.
(3) many ground region measurement infrared gas sensor of the present invention, takes the form of rotating disk, it is only necessary to pass through control
Rotating disk, to change filter arrays, so that it may measure many gas concentrations of different regions.
(4) many ground region measurement infrared gas sensor of the present invention, using the form of contrast, is examined by comparative analysis
The infrared absorption peak light intensity and the infrared luminous intensity corresponding to contrast optical filter of gas are surveyed, makes testing result more accurate.
(5) many ground region measurement infrared gas sensor of the present invention, technique is simple, cost is low, simultaneous in CMOS technology
Hold, the detection, conditioning and process circuit of signal can be integrated, coincidence senser miniaturization, array, intelligentized hair
Exhibition trend.
Brief description of the drawings
Fig. 1 is sensor of the invention profile；
Fig. 2 is the filter arrays figure of the present invention；
Fig. 3 is the rotating disk figure of the present invention；
Fig. 4 is the infrared detector array figure of the present invention；
Fig. 5 is the circuit test system structure chart of the present invention；
Each label in figure：1. infrared light supply, 2. concentration pieces, 3. air inlets, 4. frameworks, 5. detection air chambers, 6. infrared acquisitions
Device, 7. infrared detector leads, 8. rotating disks, 9. speculums, 10. optical filters, 11. supports, 12 gas outlets, 13. rotating disks are drawn
Line, 14. identifiers, 15. registration marks symbol.
Embodiment
To be easy to understand the technical means, the inventive features, the objects and the advantages of the present invention, with reference to
Embodiment, is expanded on further the present invention.
Referring to Fig. 1 to Fig. 5, in the present embodiment, AC power that infrared gas sensor includes being sequentially connected, sensitive visit
Head, signal conditioning circuit and control circuit.
Sensing probe includes infrared light supply 1, concentration piece 2, air inlet 3, framework 4, detection air chamber 5, infrared detector 6, red
External detector lead 7, rotating disk 8, speculum 9, optical filter 10, support 11, gas outlet 12, rotating disk lead 13, identifier 14,
To standard identifier 15.
Detect that the groove ends of air chamber 5 and infrared light supply 1 are provided with air inlet 3, the right-hand member of detection air chamber 5 is provided with gas outlet 12.
Infrared light supply 1 is arranged on the left end of detection air chamber 5, and the framework 4 of the exit end of infrared light supply 1 is cylindrical structure so that outgoing
Light is directional light as far as possible.
Infrared light supply 1 is passed to infrared light of the external radiation wave-length coverage at 1~20 μm after electric current, is converged after concentration piece 2
A branch of directional light is polymerized to, then multiple reflections reach filter arrays in detection air chamber 5.
Wherein, infrared light supply 1 is LED infrared light supplies, and the light source is passed to after electric current.To external radiation wide range infrared light, its ripple
Long scope is at 1~20 μm, the need for meeting instrument to infrared light wave-length coverage.
Wherein, concentration piece 2 be optical glass LED collector lenses, the divergence expression that the lens send LED infrared light supplies it is red
Outer light pools a branch of directional light.
Wherein, detection air chamber 5 is rectangular parallelepiped structure, and air chamber internal face is all provided with speculum 9, by infrared light supply 1 send through
The directional light that concentration piece 2 is converged reaches optical filter 10 after multiple reflections back and forth in detection air chamber 5.
Wherein, optical filter 10 is arranged on a disk using the form of array, is divided into three optical filters by optical filter 10
Array, per strip array provided with four optical filters 10, and the equal length being spaced between the length and optical filter 10 of each optical filter 10,
So that reaching exactly to next optical filter 10 after reflexing to reflecting again on optical filter 10, each spacer support 11 is connected
, per strip array using its central point as crosspoint, the angle per strip array is 60 °.
Wherein, three optical filters 10 are detection optical filter in every filter arrays, and another is contrast optical filter, that is, is visited
Surveying optical filter can be by an infrared absorption peak of corresponding three kinds of gas, and contrast optical filter can pass through the red of wave band
Outer light, this infrared light is not absorbed by gas.
Wherein, other positions of disk where three filter arrays are metal material, one side of this material just to air chamber
For reflecting surface.
Wherein, optical filter 10 is bandpass filter, and the optical filter 10 is through a kind of infrared light of required Detection wavelength, reflection
The infrared light of its all band.
Wherein, the disc centre of filter arrays arrangement is connected to a pillar, and pillar upper end is connected to rotating disk 8, uses
To rotate control filter arrays.
Wherein, four detectors are fixed on air chamber upper frame 4, each by infrared detector 6 using the form of array
Detector is just to an optical filter 10.
Wherein, infrared detector 6 is pyroelectricity.
Wherein, the infrared light that infrared light supply 1 is sent shines infrared acquisition through detecting after air chamber 5 after filtered 10
In device 6, and composition according to the gas indoor gas passed through and the transmitted spectrum of concentration formation different characteristic, absorbed on transmitted spectrum
The change of peak intensity then embodies the concentration of gas, then current signal is converted into data signal, basis signal with AD converter
The size of change calculates the concentration of gas.
Wherein, AD converter uses AD7195.
Wherein, signal isolator uses ADuM5401 digital isolators.
Wherein, single-chip microcomputer uses STM32F407.
Signal conditioning circuit includes signal amplifier, traffic filter and power amplifier.
Circuit is controlled to include AD converter, signal isolator, single-chip microcomputer, LDO linear power supplies and USB interface.
Infrared detector lead connects signal amplifier, and the output end of signal isolator connects the input of single-chip microcomputer, rotation
Rotating disk lead 13 connects single-chip microcomputer.
The specific course of work of the present embodiment is as follows：
Switch on power and rotate the rotating disk 8 of device to the region of " chemical plant " title, make " chemical plant " name identifiers
14 align with to standard identifier 15, then corresponding filter arrays are from left to right followed successively by SO2Narrow-band pass filter, CO it is narrow
Bandpass filter, NO narrow-band pass filter, contrast optical filter, SO28.7 μm of an absorption is have chosen in infrared band
Peak, CO have chosen 4.65 μm of an absworption peak in infrared band, and NO have chosen 5.3 μm of an absorption in infrared band
Peak, contrast optical filter have chosen the infrared light that wavelength is 18 μm in infrared band.Device is positioned over concentration known again
SO2, in CO, NO gas, pass through air inlet/outlet 12 so that be full of in detection air chamber 5 after under test gas, what infrared light supply 1 was sent
Infrared light absorbs by the gas being detected in the detection reflection process of air chamber 5 in air chamber 5 so that light intensity changes, and in gas
The absworption peak wave band light intensity change of body is particularly evident, after optical filter 10, and the infrared light of specific wavelength reaches infrared detector 6
On, the infra-red radiation for detecting and receiving is transformed into faint current signal by detector element, through the field in probe
Outwards exported after the amplification of effect pipe, signal condition is carried out by modulate circuit, and current signal is converted to by AD converter
Data signal, records corresponding data signal, reaches infrared spy by contrasting 18 μm of infrared luminous intensity of optical filter in addition
Survey on device 6, the infra-red radiation for detecting and receiving is transformed into faint current signal by detector element, through in probe
FET amplification after outwards export, by modulate circuit carry out signal condition, and by current signal pass through AD converter turn
Data signal is changed to, corresponding data signal is recorded.SO under various concentrations known to big measurement again2, CO, NO gas, will
The data signal that the data signal that detection optical filter is obtained is obtained with contrast optical filter is contrasted, so as to obtain digital signal change
Size, the size according to digital signal change is obtained on SO2, intend between CO, NO gas concentration and digital signal change size
Close curved line relation.Similarly, rotating disk 8 is rotated to the region of " waste plant " and " mine " title, it is demarcated.
When carrying out a certain chemical plant unknown gas concentration detection, switch on power and rotate the rotating disk 8 of device to " chemical industry
The region of factory " title, makes " chemical plant " name identifiers 14 be alignd with to standard identifier 15, then the lead in rotating disk 8 is connected
Single-chip microcomputer, single-chip microcomputer is adjusted to " chemical plant " detection mode.Pass through air inlet 3 and gas outlet 12 so that be full of in detection air chamber 5
Under test gas, then infrared light supply 1 is connected, the infrared light that infrared light supply 1 is sent converges the continuous transmitting by air chamber through concentration piece 2
After the absorption of gas, infrared detector array is shone by filter arrays, is received by infrared detector 6 from optical filter 10
It is changed into faint current signal after the infrared light detecting come in, to outer output after the FET amplification in probe,
Signal condition is carried out by modulate circuit, and current signal is converted into data signal by AD converter, then according to numeral
The size of signal intensity detects SO in air chamber 5 to calculate2, CO, NO gas concentration.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. a kind of non-spectral formula infrared gas sensor for how regional and many gasmetries, it is characterised in that including sensitivity
Probe, signal conditioning circuit and control circuit；
The sensing probe include detection air chamber (5), installed in detection air chamber (5) one end infrared light supply (1), be arranged on it is infrared
The concentration piece (2) of light source (1) transmitting terminal, M filter arrays, infrared detector array and rotating disk (8), the detection air chamber
(5) air inlet (3) and gas outlet (12) are provided with, the rotating disk (8) is provided with multiple identifiers (14), each mark
Accord with the resistance of different resistances built in (14), when the rotating disk (8) turns to identifier (14) of setting, the rotating disk
(8) the rotating disk lead (13) on is linked into single-chip microcomputer；
The detection air chamber (5) includes framework (4) and the speculum (9) installed in framework (4) internal face, the optical filter battle array
Row, infrared detector array and rotating disk (8) are successively set on the framework (4) of infrared light supply (1) exit end；The optical filter
Array includes N number of optical filter (10) and the support (11) for connecting optical filter (10), and the infrared detector array includes N number of
Infrared detector (6)；The center of the support (11) is provided with pillar, and the top of the pillar is connected with rotating disk (8)；
Traffic filter and signal that the signal conditioning circuit includes signal amplifier, is connected with signal amplifier output end
The power amplifier that filter output is connected, the input of the signal amplifier and the output end of infrared detector (6)
It is connected；
AD converter that the control circuit includes being connected with power amplifier output, it is connected with AD converter output end
Signal isolator and single-chip microcomputer；
The output end of the rotating disk (8) and the output end of signal isolator are connected with the input of single-chip microcomputer, wherein, M,
N is positive integer.
2. the non-spectral formula infrared gas sensor according to claim 1 for how regional and many gasmetries, it is special
Levy and be, the filter arrays are specifically provided with three, and every filter arrays are specifically provided with four optical filters (10)；And every
The filter arrays are using central point as crosspoint, and the angle between adjacent two filter arrays is 60 °.
3. the non-spectral formula infrared gas sensor according to claim 2 for how regional and many gasmetries, it is special
Levy and be, the equal length being spaced between the length and two neighboring optical filter (10) of each optical filter (10).
4. the non-spectral formula infrared gas sensor according to claim 2 for how regional and many gasmetries, it is special
Levy and be, three optical filters (10) in every filter arrays for detection optical filter, another optical filter (10) for pair
Compare optical filter.
5. the non-spectral formula infrared gas sensor according to claim 1 for how regional and many gasmetries, it is special
Levy and be, the M filter arrays are arranged on disk, the disk is reflecting surface just to the one side of detection air chamber (5).
6. the non-spectral formula infrared gas sensor according to claim 1 for how regional and many gasmetries, it is special
Levy and be, rotate the rotating disk (8), when registration mark symbol (15) on the identifier (14) upward arrow direction and framework (4)
During alignment, each infrared detector (6) is just to an optical filter (10).
7. the non-spectral formula infrared gas sensor according to claim 1 for how regional and many gasmetries, it is special
Levy and be, the infrared light supply (1) specifically uses LED infrared light supplies, its wave-length coverage is 1~20 μm.
8. the non-spectral formula infrared gas sensor according to claim 1 for how regional and many gasmetries, it is special
Levy and be, the concentration piece (2) specifically uses optical glass LED collector lenses, for by infrared light supply (1) send it is red
Outer light pools a branch of directional light.
9. the non-spectral formula infrared gas sensor according to claim 1 for how regional and many gasmetries, it is special
Levy and be, the optical filter (10) specifically uses bandpass filter；The infrared detector (6) specifically uses heat and released
Electric infrared sensor.
10. the non-spectral formula infrared gas sensor according to claim 1 for how regional and many gasmetries, it is special
Levy and be, the AD converter uses AD7195；The signal isolator uses ADuM5401 digital isolators；Institute
State single-chip microcomputer and use STM32F407.
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