CN109946260A - Gas concentration detection apparatus and method - Google Patents
Gas concentration detection apparatus and method Download PDFInfo
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- CN109946260A CN109946260A CN201910238790.XA CN201910238790A CN109946260A CN 109946260 A CN109946260 A CN 109946260A CN 201910238790 A CN201910238790 A CN 201910238790A CN 109946260 A CN109946260 A CN 109946260A
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Abstract
The present invention relates to a kind of gas concentration detection apparatus and methods.The gas concentration detection apparatus includes pedestal and cover board: pedestal includes bottom plate and the baffle set on bottom plate surrounding, and baffle and bottom plate are formed together an accommodating cavity, and shape, the size of accommodating cavity are matched with the cover board, and accommodating cavity is for placing cover board；Infrared light supply is set on cover board, for radiating the infrared light of preset wavelength；Bottom plate offers gas circulation groove what is be in contact with cover board on one side, and the mirror surface that muti-piece is used to increase the infrared light light path is equipped in the gas circulation groove；The through-hole for circulating under test gas is offered on the side wall of the gas circulation groove, the side wall for opening up through-hole is parallel with the part light path of the infrared light；Infrared detector is set on cover board, obtains the concentration of under test gas to the uptake of infrared light under test gas in detection gas circulation groove.The application can reduce the volume of device while increasing light path, while device stability is also relatively higher.
Description
Technical field
The present invention relates to field of gas detection, more particularly to a kind of gas concentration detection apparatus and method.
Background technique
Infrared detector is mainly used for measuring the content of the specific gas in environment, has to residents ' health and industrial production
Greater significance.The method of detection gas has titration, solid electrolyte, capacitor, infrared absorption method.The infrared detector of commercialization
It is mainly based upon solid electrolyte and infrared absorption principle.The principle of solid electrolyte infrared detector is to pass through gas using gas
Ion is generated when quick material, forms electromotive force, gas concentration is characterized with this.Conductivity height, sensitivity and the choosing of this sensor
It is good to select characteristic, but range is shorter, and if for a long time be exposed under high concentration environment will cause it is irreversible damage so that
Measurement range is restricted.Principle of the infrared infrared detector based on non-dispersive infrared, by measurement under test gas to certain wave
The degree of infrared optical attenuation is grown to calculate the content of under test gas.This sensor measurement range is relatively wide, measurement process is to element
Lossless, service life is longer, non-maintaining, but stability and the opposite solid-state electrolyte sensor of repeatability are poor, data processing
Journey is complex.
Summary of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of gas concentration detection apparatus and method
A kind of gas concentration detection apparatus, the gas-detecting device includes pedestal and cover board:
The pedestal includes bottom plate and the baffle set on bottom plate surrounding, and the baffle and the bottom plate are formed together an accommodating
Chamber, shape, the size of the accommodating cavity are matched with the cover board, and the accommodating cavity is for placing the cover board；
Infrared light supply is set on the cover board, for radiating the infrared light of preset wavelength；
The bottom plate offers gas circulation groove what is be in contact with the cover board on one side, is equipped in the gas circulation groove
Muti-piece is used to increase the mirror surface of the infrared light light path；It is offered on the side wall of the gas circulation groove for for be measured
The through-hole of gas circulation, the side wall for opening up the through-hole are parallel with the part light path of the infrared light；
Infrared detector is set on the cover board, for detecting in the gas circulation groove through the under test gas part
The intensity of infrared light after absorption is to obtain the concentration of the under test gas.
Three pieces are equipped in the gas circulation groove in one of the embodiments, for increasing the infrared light light path
Mirror surface, three pieces of mirror surfaces are respectively defined as the first mirror surface, the second mirror surface and third mirror surface；Described
Two-mirror face and the third mirror surface are set to the same side of the gas circulation groove, first mirror surface be set to
The opposite side of second mirror surface, the light after first mirror surface reflection inject second reflecting mirror
Face, the light after second mirror surface reflection inject the third mirror surface.
The angle between the shorter edge and the bottom plate of first mirror surface is in 45 ° in one of the embodiments,；
Second mirror surface, third mirror surface are perpendicular to the bottom plate, second mirror surface and the third reflecting mirror
Angle between face is 90 °.
The gas circulation groove further includes a light receiver portion in one of the embodiments, with first reflecting mirror
Face is set to the same side, and the light receiver portion is for receiving and collecting the infrared light after the third reflective surface
Line.
The light receiver portion is the groove of isosceles-trapezium-shaped in one of the embodiments,.
First mirror surface, the second mirror surface, third mirror surface are high reflection in one of the embodiments,
Mirror surface.
The infrared detector is using the thermopile sensor for being internally integrated NTC in one of the embodiments,.
The thermopile sensor is dual-channel type sensor, the thermopile sensor in one of the embodiments,
Each channel be respectively provided with an optical filter.
A kind of gas concentration detection method is based on a kind of gas concentration detection apparatus, the gas concentration detection apparatus packet
Pedestal, cover board and infrared light supply and infrared detector on the cover board are included, after the pedestal is matched with the cover board
It is formed with the gas flowing lumen of an accommodating under test gas, the infrared light that the infrared light supply projects is in the gas flowing lumen
It is detected after multiple reflections by the infrared detector, the infrared detector is dual-channel type thermopile sensor；The side
Method includes:
It obtains in the gas flowing lumen that infrared detector acquires under infrared light supply closed state and opening state respectively
Measurement channel sampled data and reference channel sampled data；
The temperature gap between the sample temperature and preset temperature is obtained according to the sample temperature of the infrared detector；
According to the Measurement channel sampled data and the reference channel sampled data and the temperature under two states
Difference obtains under test gas to the relative absorbency of infrared light；
The concentration of the under test gas is obtained according to the relative absorbency.
The Measurement channel sampled data according under two states and the benchmark in one of the embodiments,
Channel sampled data and the temperature gap obtain the step of relative absorbency of the under test gas to infrared light, comprising:
Obtain the first difference and base between the sampled data that Measurement channel obtains under infrared light supply closing and opening state
The second difference between sampled data that quasi- channel obtains；
Obtain the ratio between first difference and second difference；
The ratio is compensated according to the temperature gap；
Compensated value is filtered；
The relative absorbency is obtained according to the value after filtering processing.
The calculation formula of the relative absorbency in one of the embodiments, are as follows:
FA=1-AR1/ZERO
Wherein, FA indicates relative absorbency；AR1 indicates compensated value；ZERO is calibration coefficient.
The calculation formula of the under test gas concentration in one of the embodiments, are as follows:
Wherein, x indicates under test gas concentration, and T indicates that sample temperature, Tcal indicate preset temperature, and SPAN is correction factor,
B, c is constant.
Above-mentioned gas concentration detection apparatus and method, by opening up gas circulation groove on the bottom plate of pedestal, in gas stream
The mirror surface that muti-piece is used to increase infrared light is set in through slot, the body of detection device can be reduced under the premise of increasing light path
Product；And the through-hole under test gas circulation is opened up on the side wall of gas circulation groove, opens up the side wall and infrared light of through-hole
Part light path it is parallel, that is to say, that on the direction of propagation perpendicular to light be equipped with gas communication through-holes, can reduce in this way
The leakage of infrared light enhances the intensity for receiving signal with this, reduces detection difficulty.It, should when pedestal and cover board match
Gas circulation groove has just become gas flowing lumen, is being connected under test gas by the infrared light control for projecting infrared light supply
In gas flowing lumen, and the absorbed amount of infrared light (under test gas partially absorbs the infrared light of radiation) is measured, thus
Realize the measurement of under test gas concentration.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the gas concentration detection apparatus in an embodiment；
Fig. 2 is the flow diagram of the gas concentration detection method in an embodiment；
Fig. 3 is the idiographic flow schematic diagram of step S30 in Fig. 2.
Specific embodiment
The application in order to facilitate understanding is described more fully the application below with reference to relevant drawings.In attached drawing
Give the better embodiment of the application.But the application can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more disclosure of this application
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.
Referring to Fig. 1, for the structural schematic diagram of the gas concentration detection apparatus in an embodiment.Gas concentration detection dress
Set may include pedestal (Fig. 1 is not indicated) and cover board 2.Wherein, pedestal includes bottom plate 10 and the baffle 20 set on bottom plate surrounding,
Only one of baffle is indicated in Fig. 1.It is trapped among the baffle 20 of bottom plate surrounding and bottom plate together forms an accommodating
Chamber (Fig. 1 is not indicated), shape, the size of the accommodating cavity are matched with cover board 2, and accommodating cavity is for placing cover board 2, in other words
It says, pedestal is combined by accommodating cavity with cover board 2.Infrared light supply 210 is arranged on cover board 2, wherein infrared light supply 210 is used for
Radiate the infrared light of preset wavelength.Further, 1 micron -5 microns of infrared light supply can be selected in infrared light supply 210.
Bottom plate 10 offers gas circulation groove (Fig. 1 is not indicated) what is be in contact with cover board 2 on one side, when bottom plate 10 and cover board
2 when combine, and gas circulation groove has reformed into a gas flowing lumen.It is red for increasing that muti-piece is equipped in gas circulation groove
The mirror surface of UV light light path, Fig. 1 illustrate only partial mirror surface；For ease of description, the application is with three pieces of reflecting mirrors
It is illustrated for face, three pieces of mirror surfaces are respectively defined as the first mirror surface 111, and the second mirror surface 112 and third are anti-
Penetrate mirror surface 113.Second mirror surface 112 is set to the same side of gas circulation groove, the first mirror surface with third mirror surface 113
111 are set to the side opposite with the second mirror surface 112, in other words, the first mirror surface 111 and the second mirror surface 112
It is oppositely arranged with third mirror surface 113.First mirror surface 111 is oppositely arranged with infrared light supply 210, in other words, infrared
The light that light source 210 projects is received by the first mirror surface 111.Light after the reflection of the first mirror surface 111 injects second
Mirror surface 112, the light after the reflection of the second mirror surface 112 inject third mirror surface 113.It will be set in gas circulation groove
The mirror surface that opposite is mutually reflected light is set, light path can be increased, so that the volume of detection device reduces.Further
Ground, the first mirror surface 111, the second mirror surface 112 and third mirror surface 113 can all be rectangle.First mirror surface
111 rectangle size can be adapted with the size of infrared light supply 210, in this way, the light that infrared light supply 210 projects could all
It is received by the first mirror surface 111.It is appreciated that the first mirror surface 111, the second mirror surface 112 and third mirror surface
113 shape can also be other shapes, not further limit herein.It further, is square in the first mirror surface 111
In the case where shape, the wide angle between bottom plate in shorter edge, that is, mathematical meaning is in 45 °, the second mirror surface
112, third mirror surface 113 is arranged perpendicular to bottom plate 10, and between the second mirror surface 112 and third mirror surface 113
Angle to be 90 ° of can protect the setting in this way of the first mirror surface 111, the second mirror surface 112 and third mirror surface 113
Card reflected light line can be received by each mirror surface, reduce the loss of light.In order to ensure more radiation as far as possible
Into infrared detection its without being absorbed by gas circulation groove, the application by the first mirror surface 111, the second mirror surface 112 and
Third mirror surface 113 is set as the mirror surface with high reflection characteristic, meanwhile, the surfaces externally and internally of gas flowing lumen is made at plating
Reason, makes it have high reflection characteristic.
Further, gas circulation groove is that the identical side of the first mirror surface 111 is additionally provided with a light receiver portion
120, which is used to receive and collect the infrared light after the reflection of third mirror surface 113.The light receiver
Portion 120 is the groove of isosceles-trapezium-shaped, can more will be anti-from third mirror surface 113 by being arranged to this shape
Light after penetrating collects.
The through-hole 130 for circulating under test gas is offered on the side wall of gas circulation groove, opens up the side wall of through-hole 130
It is parallel with the part light path of infrared light.Under test gas in the application selects carbon dioxide to implement below for ease of description
Also using carbon dioxide as under test gas in example.It can be seen from the figure that opening up the side wall of through-hole 130 and in the first mirror surface
111 and the second light path between mirror surface 112 it is parallel, the also light between third mirror surface 113 and light receiver portion 120
Cheng Pinghang.For the ease of gas circulation, the application is provided with through-hole 130, the company between through-hole 130 in opposite two side walls
Line can reduce the leakage of infrared light perpendicular on the direction of propagation of light in this way, enhance the intensity for receiving signal with this, reduce
Detection difficulty.Further, contain excessive water vapour from the gas that through-hole imports in order to prevent, the application is also offering
Waterproof and breathable diaphragm has been puted up in the place of through-hole, for reducing the import volume of water vapour, increases detection accuracy.
Infrared detector 220, be set to cover board 2 on, in detection gas circulation groove after under test gas partially absorbs
The intensity of infrared light is to obtain the concentration of under test gas.In one embodiment, infrared detector 220 and light receiver portion
120 are oppositely arranged.In other words, when cover board 2 to be placed in accommodating cavity, the position of infrared detector 220 is just connect with light
The position in receipts portion 120 is opposite.Further, which uses and has been internally integrated NTC (Negative
Temperature Coefficient, negative tempperature coefficient thermistor) thermopile sensor.NTC, which refers to, rises electricity with temperature
Resistance has exponent relation reduction, the thermistor phenomenon with negative temperature coefficient and material.Thermopile sensor is based primarily upon presumptuously
Infrared principles are dissipated, the principle of non-dispersion infrared (NDIR) is: when a branch of infrared light is across the gas stream for being stored under test gas
In through slot, the under test gas in slot can absorb the infrared ray of specific frequency.By measuring the infrared ray absorbing amount of corresponding frequencies, just
It can determine the concentration of the gas component.Why say that this technology is nondispersive, is because passing through the infrared of gas circulation groove
Light is without being pre-filtered.
Further, thermopile sensor selects dual-channel type sensor, survey of one of channel as carbon dioxide
Channel is measured, another channel is as reference channel.An optical filter is mounted on carbon dioxide Measurement channel, wherein cardiac wave
Length can be 4260 nanometers, and the central wavelength for the optical filter installed on reference channel is 3910 nanometers.Because central wavelength is
4260 nanometers of infrared light is Chong Die with the absorbing wavelength of carbon dioxide, and usually, central wavelength is in carbon dioxide absorption wave
Optical filter except length can be used as reference channel.After reference channel, dust or radiation intensity decaying can be eliminated
Caused measurement error.Since carbon dioxide and water vapour do not absorb 3910 nanometers of infrared light nearly all, so, this
Apply for that the optical filter that Selection Center wavelength is 3910 nanometers as reference channel, can reduce water vapour shadow caused by experiment
It rings.
Further, thermopile sensor can also be only with single pass thermopile sensor, due to using single-pass
Road can lack the compensation to infrared light supply fluctuation, so infrared light supply is driven using constant current.Dress also can be improved using constant current driving
The stability set.
When actual measurement, the relationship of the concentration of gas and uptake can be stored into infrared detector, or
It is by operator that the uptake measured is corresponding with the value in the concentration versus absorbance scale got before, thus get to
Survey the concentration in gas.
In one embodiment, the gas concentration detection apparatus can also include concentration calculation module (Fig. 1 is not indicated),
The concentration calculation module calculates gas to be measured for the intensity of the infrared light after partially absorbing according to the under test gas detected
The concentration of body.Specifically, which may include Measurement channel sampled data acquiring unit (Fig. 1 is not indicated), base
Quasi- channel sampled data acquiring unit (Fig. 1 is not indicated), temperature difference acquiring unit (Fig. 1 is not indicated), relative absorbency acquiring unit
(Fig. 1 is not indicated) and concentration acquiring unit (Fig. 1 is not indicated).Wherein, Measurement channel sampled data acquiring unit and reference channel
Sampled data acquiring unit is respectively used to obtain the gas that infrared detector acquires under infrared light supply closed state and opening state
Measurement channel sampled data and reference channel sampled data in flowing lumen；Temperature difference acquiring unit is used for according to infrared detector
Sample temperature obtains the temperature gap between sample temperature and preset temperature；Relative absorbency acquiring unit is used for according to two kinds of shapes
Measurement channel sampled data and reference channel sampled data and temperature gap under state obtain under test gas to the phase of infrared light
To absorptivity；Concentration acquiring unit is used to obtain the concentration of under test gas according to relative absorbency.Further, relative absorbency
Acquiring unit can also include that the first difference obtains subelement, the second difference obtains subelement, ratio obtains subelement, compensation
Unit, filtering subunit and relative absorbency obtain subelement.Wherein the first difference obtains subelement for obtaining infrared light supply
The first difference between sampled data that Measurement channel obtains under closing and opening state；Second difference obtains subelement for obtaining
Take the second difference between the sampled data that reference channel obtains under infrared light supply closing and opening state；Ratio obtains subelement
For obtaining the ratio between the first difference and the second difference；Compensation subelement according to temperature gap reduced value for being mended
It repays；Filtering subunit is for being filtered compensated value；Relative absorbency obtains subelement and is used at according to filtering
Value after reason obtains relative absorbency.
In one embodiment, it please continue to refer to Fig. 1, on the side wall for offering through-hole 130, is also provided with convenient for crawl
Handgrip (Fig. 1 is not indicated).
Referring to Fig. 2, the application also provides a kind of gas concentration detection method, this method is detected based on a kind of gas concentration
Device, the gas concentration detection apparatus can be the gas concentration detection apparatus in any of the above embodiment.In one embodiment
In, which includes pedestal, cover board and infrared light supply and infrared detector on cover board, pedestal and lid
Plate is formed with the gas flowing lumen of an accommodating under test gas after matching, the infrared light that infrared light supply projects is in gas flowing lumen
Middle to be detected after multiple reflections by the infrared detector, infrared detector is dual-channel type thermopile sensor；This method can
Comprising steps of S10-S40.
Step S10 obtains the gas that infrared detector acquires under infrared light supply closed state and opening state respectively
Measurement channel sampled data and reference channel sampled data in flowing lumen.
It is appreciated that gas circulation groove has reformed into a gas flowing lumen when bottom plate is combined with cover board.It is logical
It crosses thermopile sensor to sample the gas flowing lumen under light source closed state, obtains Measurement channel data under this state
Signal and reference channel data-signal, wherein by Measurement channel data-signal under this state, be denoted as ACT_low；By this state
Under reference channel data-signal be denoted as REF_low；Similarly, infrared light supply is opened, then by thermopile sensor at this time
Gas flowing lumen in sampled, Measurement channel data-signal and reference channel data-signal are obtained, by survey under this state
Amount channel data signal is denoted as ACT_high, and reference channel data-signal is denoted as REF_high.
Step S20 is obtained between the sample temperature and preset temperature according to the sample temperature of the infrared detector
Temperature gap.
Specifically, NTC can be first passed through to sample the environment temperature in gas flowing lumen, Kelvin is then calculated
Temperature T is obtaining the difference between kelvin degree T and then acquisition and preset calibration temperature Tcal.The tool of temperature Tcal
Body numerical value can be selected and be adjusted according to the actual situation, not further limited herein.
Step S30, according under two states the Measurement channel sampled data and the reference channel sampled data and
The temperature gap obtains under test gas to the relative absorbency of infrared light.
Specifically, referring to Fig. 3, being the sub-step flow diagram of step S30.The sub-step may include: step
S310-S340。
Step S310 obtains first between the sampled data that Measurement channel obtains under infrared light supply closing and opening state
The second difference between sampled data that difference and reference channel obtain.
Step S320 obtains the ratio between first difference and second difference.
Step S330 compensates the ratio according to the temperature gap.
Step S340 is filtered compensated value.
Step S350 obtains the relative absorbency according to the value after filtering processing.
Specifically, it after getting temperature gap, is obtained under infrared light supply opening and closing two states by obtaining
Measurement channel obtain sampled data between the first difference, be denoted as ACT, then obtain again infrared light supply open and close two
The second difference between sampled data that the reference channel obtained under kind state obtains, is denoted as REF, then obtains the first difference
Ratio between ACT and the second difference REF, is denoted as AR, AR=ACT/REF.Then it is mended according to temperature gap reduced value AR
It repays, obtains compensated value, be denoted as AR1, can be obtained by following formula:
AR1=AR-k* (T-Tcal)
Wherein, T is sample temperature, and Tcal is preset temperature, and k is coefficient.
Here, can also be by Kalman filter to concentration offsets value AR1 processing.Then, it is calculated by the following formula
Relative absorbency:
FA=1-AR1/ZERO
Wherein, FA indicates relative absorbency, and ZERO is calibration coefficient.
Step S40 obtains the concentration of the under test gas according to the relative absorbency.
Specifically, the concentration of under test gas can be obtained according to the following formula:
Wherein, x indicates under test gas concentration, and T indicates that sample temperature, Tcal indicate preset temperature, and SPAN is correction factor,
B, c is constant, and generally, the value of SPAN is less than 1.
In the case where the numerical value of constant b, c do not provide, can by taking ZERO=1, SPAN=1 at a temperature of Tcal,
It repeats above-mentioned detecting step S10-S30 to sample the carbon dioxide of at least five kinds of various concentrations, obtains AR1 about titanium dioxide
The curve of concentration of carbon x.Pass through functionMatched curve determines constant b and c.
In the system that constant b and c have given, ZERO and SPAN can be determined by two o'clock calibration method.Specifically,
S10-S30 is repeated the above steps at a temperature of Tcal respectively to xlow low concentration, xcal high concentration carbon dioxide sample (its
Middle xlow, xcal respectively indicate detection bound) obtain the temperature compensation coefficient ARlow and high gas concentration under low gas concentration
Under temperature compensation coefficient ARcal, ZERO and SPAN can be acquired by following formula:
Wherein,
In one embodiment, can by calibration coefficient ZERO, correction factor SPAN, constant b, c value according to gas to be measured
The height of bulk concentration carries out value respectively, in other words, (it corresponds to a concentration ranges), mark when gas concentration is low concentration
Determine coefficient ZERO, correction factor SPAN, constant b, c have a fixed numerical value；When gas concentration is high concentration, (it corresponds to one
A concentration ranges), calibration coefficient ZERO, correction factor SPAN, constant b, c are the numerical value that another is fixed again.In advance not
It, can be respectively with the calibration coefficient ZERO of two concentration ranges, correction factor SPAN, constant when knowing the concentration range of under test gas
B, c obtains relative absorbency, should theoretically be consistent according to two calculated relative absorbencies of concentration range, still
Certain deviation is had when practical calculating, the application is when final value, selection and theoretical relative absorbency deviation
It is lesser that as relative absorbency.Due to the rough amount for the under test gas being passed through in gas concentration detection apparatus in advance
It is (high concentration or the low concentration) that can be known, only its specific numerical value needs to be obtained by this method.So passing through
It is set as the value of calibration coefficient ZERO, correction factor SPAN, constant b, c to carry out value respectively according to the height of gas concentration,
Precision when measurement of concetration can be improved.
Above-mentioned gas concentration detection method by obtaining infrared acquisition under infrared light supply closed state and opening state respectively
The Measurement channel sampled data and reference channel sampled data of device acquisition；Then it obtains and is adopted described in the sample temperature of NTC and acquisition
Temperature gap between sample temperature and preset temperature；According under two states the Measurement channel sampled data and the benchmark
Channel sampled data and the temperature gap obtain under test gas to the relative absorbency of infrared light；Finally further according to opposite suction
The concentration of yield acquisition under test gas.Data processing can be reduced by obtaining concentration offsets value by using the mode for obtaining temperature gap
The complexity and repeatability of algorithm.By providing the determination method of constant b, c, so that the detection method of the application is more quasi-
Really, detection accuracy is higher.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (12)
1. a kind of gas concentration detection apparatus, which is characterized in that the gas-detecting device includes pedestal and cover board:
The pedestal includes bottom plate and the baffle set on bottom plate surrounding, and the baffle and the bottom plate are formed together an accommodating cavity,
Shape, the size of the accommodating cavity are matched with the cover board, and the accommodating cavity is for placing the cover board；
Infrared light supply is set on the cover board, for radiating the infrared light of preset wavelength；
The bottom plate offers gas circulation groove what is be in contact with the cover board on one side, is equipped with muti-piece in the gas circulation groove
For increasing the mirror surface of the infrared light light path；It offers on the side wall of the gas circulation groove for under test gas
The through-hole of circulation, the side wall for opening up the through-hole are parallel with the part light path of the infrared light；
Infrared detector is set on the cover board, partially absorbs for detecting in the gas circulation groove through the under test gas
The intensity of infrared light afterwards is to obtain the concentration of the under test gas.
2. gas concentration detection apparatus according to claim 1, which is characterized in that be equipped with three pieces in the gas circulation groove
For increasing the mirror surface of the infrared light light path, three pieces of mirror surfaces are respectively defined as the first mirror surface, second instead
Penetrate mirror surface and third mirror surface；Second mirror surface is set to the same of the gas circulation groove with the third mirror surface
Side, first mirror surface are set to the side opposite with second mirror surface, reflect through first mirror surface
Light afterwards injects second mirror surface, and the light after second mirror surface reflection injects the third reflecting mirror
Face.
3. gas concentration detection apparatus according to claim 2, which is characterized in that the shorter edge of first mirror surface
Angle between the bottom plate is in 45 °；Second mirror surface, third mirror surface are perpendicular to the bottom plate, and described
Angle between two-mirror face and the third mirror surface is 90 °.
4. gas concentration detection apparatus according to claim 2, which is characterized in that the gas circulation groove further includes a light
Line receiving unit is set to the same side with first mirror surface, and the light receiver portion is for receiving and collecting through the third
The infrared light after reflective surface.
5. gas concentration detection apparatus according to claim 4, which is characterized in that the light receiver portion is isosceles trapezoid
The groove of shape.
6. according to the described in any item gas concentration detection apparatus of claim 2-4, which is characterized in that first reflecting mirror
Face, the second mirror surface, third mirror surface are high reflecting mirror surface.
7. gas concentration detection apparatus according to claim 4, which is characterized in that the infrared detector is using internal collection
At the thermopile sensor for having NTC.
8. gas concentration detection apparatus according to claim 7, which is characterized in that the thermopile sensor is binary channels
Each channel of type sensor, the thermopile sensor is respectively provided with an optical filter.
9. a kind of gas concentration detection method, which is characterized in that be based on a kind of gas concentration detection apparatus, the gas concentration inspection
Surveying device includes pedestal, cover board and infrared light supply and infrared detector on the cover board, the pedestal and the cover board
The gas flowing lumen of an accommodating under test gas is formed with after matching, the infrared light that the infrared light supply projects is in the gas
It is detected after multiple reflections by the infrared detector in flowing lumen, the infrared detector is dual-channel type thermoelectric pile sensing
Device；The described method includes:
The survey in the gas flowing lumen that infrared detector acquires under infrared light supply closed state and opening state is obtained respectively
Measure channel sampled data and reference channel sampled data；
The temperature gap between the sample temperature and preset temperature is obtained according to the sample temperature of the infrared detector；
According under two states the Measurement channel sampled data and the reference channel sampled data and the temperature gap
Under test gas is obtained to the relative absorbency of infrared light；
The concentration of the under test gas is obtained according to the relative absorbency.
10. gas concentration detection method according to claim 9, which is characterized in that the institute according under two states
It states Measurement channel sampled data and the reference channel sampled data and the temperature gap obtains under test gas to infrared light
Relative absorbency the step of, comprising:
The first difference and benchmark obtained between the sampled data that Measurement channel obtains under infrared light supply closing and opening state is led to
The second difference between sampled data that road obtains；
Obtain the ratio between first difference and second difference；
The ratio is compensated according to the temperature gap；
Compensated value is filtered；
The relative absorbency is obtained according to the value after filtering processing.
11. gas concentration detection method according to claim 10, which is characterized in that the calculating of the relative absorbency is public
Formula are as follows:
FA=1-AR1/ZERO
Wherein, FA indicates relative absorbency；AR1 indicates compensated value；ZERO is calibration coefficient.
12. gas concentration detection method according to claim 11, which is characterized in that the calculating of the under test gas concentration
Formula are as follows:
Wherein, x indicates under test gas concentration, and T indicates that sample temperature, Tcal indicate preset temperature, and SPAN is correction factor, b, c
For constant.
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| CN201910238790.XA CN109946260A (en) | 2019-03-27 | 2019-03-27 | Gas concentration detection apparatus and method |
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