CN107036994A - A kind of non-dispersion infrared gas analyzer of dynamic reference and the method for detecting gas concentration - Google Patents
A kind of non-dispersion infrared gas analyzer of dynamic reference and the method for detecting gas concentration Download PDFInfo
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- CN107036994A CN107036994A CN201710379523.5A CN201710379523A CN107036994A CN 107036994 A CN107036994 A CN 107036994A CN 201710379523 A CN201710379523 A CN 201710379523A CN 107036994 A CN107036994 A CN 107036994A
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- 239000006185 dispersion Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 9
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000010521 absorption reaction Methods 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 7
- 235000013405 beer Nutrition 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 115
- 238000007791 dehumidification Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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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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Abstract
A kind of non-dispersion infrared gas analyzer of dynamic reference, including infrared light supply unit, infrared sensor unit, switch unit.Wherein described infrared light supply unit, for infrared light to be sent into the infrared sensor unit.The infrared sensor unit, for measuring electric signal that unabsorbed infrared light produces, being absorbed after the electric signal that produces of infrared light.The switch unit, including the first switching valve and the second switching valve, first switching valve and the second switching valve respectively include control circuit and magnetic valve；First switching valve is used to sample gas being input in infrared sensor unit, and second switching valve is used to reference gas being input in infrared sensor unit, and the sample gas and the reference gas are alternately input to the infrared sensor unit.The present invention is inputted by the real-time switching of reference gas and sample gas, and the zero point to infrared sensing sensor is quickly compensated, so as to accurately measure the concentration of under test gas in sample gas.
Description
Technical field
The present invention relates to a kind of non-dispersion infrared gas analyzer and the method for detecting gas concentration, more particularly to one kind are dynamic
The non-dispersion infrared gas analyzer of state reference and the method for detecting gas concentration.
Background technology
1. the principles of science
The principle applied using non-dispersion infrared gas analyzer measurement gas concentration is Beer law, and its formula is such as
Under.
I=I0e-KCL
Wherein, each alphabetical implication is as follows：
I-- is by the infrared luminous intensity after under test gas absorption in sample gas
I0-- not by the infrared luminous intensity of reference aspiration
Absorption coefficient of the under test gas to infrared light in K-- sample gas
Under test gas concentration in C-- sample gas
L-- measuring chamber length
For a non-dispersion infrared gas analyzer, its under test gas measured in sample gas is fixed, i.e. under test gas pair
The infrared Absorption coefficient k of radiation wave band is certain, and air chamber length L is certain.From Beer law it can be seen that：Do not treated by measurement
Survey the intensity I for the infrared light that gas absorbs0, absorbed after infrared light intensity I, so that it may it is determined that treating the concentration C of gas.
2. prior art
In order to measure the radiation intensity I after being actually taken up by gas, existing non-dispersion infrared gas analyzer is infrared by two beams
Light beam is each passed through not light absorbing reference air chamber and light absorbing sample air chamber, and the light beam for thus reaching reference air chamber terminal is strong
Spend I0More than the infrared beam intensity I of sample air chamber terminal.Utilize detectors measure I0With I proportionate relationship, according to Beer law,
Obtain the concentration C of under test gas in sample gas.
3. the technical problem existed
When measuring gas concentration, because measuring environment temperature change is big, the zero point of sensor in detector is easily caused
Drift so that sensor measurement absorbed after infrared light produced by electric signal it is inaccurate, treated so as to can not accurately measure
Survey the concentration of gas.
In addition, during using prior art measurement gas concentration, vapor H20, which is easily mingled in this, does not absorb light
Reference gas in, absorb part luminous energy, make sensor measure not by the electric signal produced by the infrared light of reference aspiration not
Accurately, so that the concentration of under test gas can not be measured accurately.
The content of the invention
1st, the technical problem solved：
The invention reside in a kind of non-dispersion infrared gas analyzer of dynamic reference is provided, pass through reference gas and the reality of sample gas
When switch, realize automatic quick compensation to sensor zero point.
In addition, being dehumidified by permeable dehumidification device to reference gas, so as to accurately measure not by the red of reference aspiration
Electric signal produced by outer light, and then the accurate concentration for drawing under test gas in sample gas.
2nd, the technical scheme taken：
The present invention is intended to provide a kind of non-dispersion infrared gas analyzer of dynamic reference, including it is infrared light supply unit, red
Outer sensor unit, switch unit.Wherein, the infrared light supply unit, for infrared light supply to be sent into the infrared sensing
Device unit, the infrared sensor unit is used to measuring the electric signal that unabsorbed infrared light produces, absorbed after feux rouges
The electric signal of outer generation.The switch unit includes the first switching valve and the second switching valve, and first switching valve and second is cut
Changing valve respectively includes control circuit and magnetic valve；First switching valve is used to sample gas being input in infrared sensor unit, institute
Stating the second switching valve is used to reference gas being input in infrared sensor unit, and the sample gas and the reference gas are alternately input to
The infrared sensor unit.
The non-dispersion infrared gas analyzer of above-described dynamic reference, in addition to permeation dryer unit, it is described to ooze
Saturating dryer unit includes wet reference gas entrance, dries reference gas outlet, dries blowback air entrance, the outlet of wet blowback air.Wherein,
The dry blowback air entrance, which is located at, dries reference gas outlet side, and the wet blowback air outlet is located at wet sample gas inlet side.
The control circuit of the switching valve is defeated by voltage-stable transistor, general-purpose diode, light emitting diode, switch-over control signal
Access point, switch-over control signal output point, resistance are constituted.The colelctor electrode of the voltage-stable transistor connects the sun of the general-purpose diode
Pole, the base stage of the voltage-stable transistor connects the anode of the light emitting diode, and the switch-over control signal input point is located at institute
State between voltage-stable transistor and the light emitting diode, the switch-over control signal output point is located at the voltage-stable transistor and institute
State between general-purpose diode, resistance is in series between the voltage-stable transistor and light emitting diode.
The infrared light supply unit includes infrared light supply, light cutting device, motor.The infrared light supply is infrared for giving off
Line, the light cutting device is used to infrared ray switching to light-pulse generator, and the motor is fixed on light cutting device and drives light cutting device to turn
It is dynamic.
The infrared sensor unit includes measuring chamber, detector.The measuring chamber includes air inlet, exhaust outlet, described
Air inlet is located at the two ends of the measuring appliance with the exhaust outlet respectively.The detector, including preceding absorption chamber, rear absorption chamber,
Microflow sensor, the preceding absorption chamber is with rear absorption chamber by pore insertion, and the microflow sensor is positioned in institute
State in pore, described microflow sensor is hot temperature difference type microflow sensor.
The permeation dryer unit also includes pump, and the pump is used to wet reference gas being pumped into permeation dryer.
The non-dispersion infrared gas analyzer of described dynamic reference, in addition to single-chip microcomputer, the single-chip microcomputer are used to control
First magnetic valve and the second magnetic valve, and the electric signal that the processing infrared sensor unit is produced.
Above non-dispersion infrared gas analyzer, in addition to power supply, display unit.The power supply is used to be the single-chip microcomputer
Power supply, the display unit is used for the concentration for showing under test gas in the sample gas obtained after the single-chip microcomputer processing electric signal.
The present invention provides a kind of dense using the non-dispersion infrared gas analyzer measurement gas of above-described dynamic reference
The method of degree, it comprises the following steps：
A. light is taken：Infrared light is launched by infrared light supply；
B. light absorbs：Alternately through reference gas, sample gas, wherein sample aspiration infrared light, reference gas does not absorb red to infrared light
Outer light；
C. luminous energy is detected：Detection passes through the electric signal that the infrared light after reference gas is produced, and detects by red after sample gas
The electric signal that outer light is produced；According to the relation of described two electric signals, the concentration of under test gas in sample gas is drawn by Beer law.
It can also comprise the following steps,
D. reference gas dehumidifies：Reference gas is injected from wet reference gas entrance and discharged from reference gas outlet is dried；Simultaneously will
Gas is dried from drying the injection of blowback air entrance and exporting discharge from wet blowback air, the vapor in reference gas is removed with this, then
Reference gas is alternately input to the infrared sensor unit.
3rd, the technique effect obtained：
The present invention can be quickly compensated zero point by the real-time switching to sample gas and reference gas, realize accurate survey
Amount is accurately drawn in sample gas according to Beer law and treated by the produced electric signal of the infrared light after reference gas and sample gas
Survey the concentration of gas.
In addition, removing the water vapour in reference gas by permeable dehumidification device, after osmosis water removal, the content of steam is about
0.03% or so, it will not be interfered by the measurement result of the electric signal produced by the infrared light after reference gas.
Design, realized to accurately being measured dusty gas concentration in sample gas more than.
Brief description of the drawings
Fig. 1 is structure diagram of the invention.
Fig. 2 is sensor of the invention cellular construction sketch.
Fig. 3 is solenoid valve control circuit of the invention.
Fig. 4 is permeable dehumidification schematic diagram of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment in the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art can carry out various changes and displacement, and obtained
Every other embodiment belongs to the scope of protection of the invention.
The composition structure for the non-dispersion infrared gas analyzer seen in Fig. 1, the present embodiment includes infrared light supply unit, infrared
Sensor unit, switch unit, permeation dryer unit, single-chip microcomputer, display unit, the internal structure and operation principles of each several part
As described below.
A. infrared light supply unit
The infrared light supply unit is used to provide the infrared ray of certain frequency and is sent to infrared sensor unit, described red
Outer light source unit includes infrared light supply S, light cutting device Q, motor M.The infrared light supply S is used for infrared radiation, the light cutting device Q
Infrared sensor unit is then sent to as motor M is rotated and infrared light is switched into pulsed light, the motor M, which is fixed on, cuts light
On plate Q and drive light cutting device Q rotate.
B. infrared sensor unit
The infrared sensor unit, which is used to detect to correspond to, is not absorbed ultrared luminous energy I0, absorbed after luminous energy
I。
See Fig. 2, the infrared sensor unit, which includes measuring chamber C, the measuring chamber C, is used for alternately input sample gas or reference
Gas.The measuring chamber C includes air inlet 1, exhaust outlet 2, and the air inlet 1 is used as sample gas or the input port of reference gas, the row
Gas port 2 is as by the outlet of sample gas or reference gas.
The infrared sensor unit also includes detector J, the detector J include preceding absorption chamber J1, rear absorption chamber J2,
Microflow sensor R.The preceding absorption chamber J1 is used to absorb ultrared core, and the rear absorption chamber J2 is used to absorb red
The marginal portion of outside line.The preceding absorption chamber J1 and rear absorption chamber J2 is by pore insertion, and pore is used to keep forward and backward suction
Receive the dynamic equilibrium of indoor gas.The microflow sensor R is positioned in the pore, for measuring by after sample aspiration
Infrared light produce electric signal, not by reference aspiration infrared light produce electric signal.
C. switch unit
The switch unit includes the first switching valve SV1, the second switching valve SV2, and both of which includes control circuit and electromagnetism
Whether valve, control circuit is turned on and off the corresponding mouth of magnetic valve under single-chip microcomputer control, to by sample gas input measurement room
It is controlled, shown control circuit is shown in Fig. 3.
The control circuit is inputted by voltage-stable transistor L1, light emitting diode L2, general-purpose diode L3, switch-over control signal
Point I1, switch-over control signal output point I2 are constituted.The base stage of the voltage-stable transistor L1 connects the sun of the light emitting diode L2
Pole, the colelctor electrode of the voltage-stable transistor L1 connects the anode of the general-purpose diode L3, the switch-over control signal input point
I1 is located between the voltage-stable transistor L1 and the light emitting diode L2, and the switch-over control signal output point I2 is located at described
Between voltage-stable transistor L1 and the general-purpose diode L3, resistance is in series between the voltage-stable transistor and light emitting diode.
Single-chip microcomputer switches over control to two magnetic valves by the control circuit in switching valve SV1, SV2, is described in detail such as
Under.
As control signal input point I1 of the single-chip microcomputer by the first control valve SV1, send first to the first switching valve SV1 and believe
Number when, the first switching valve SV1 O1 mouths are opened, sample gas by O1 ends input measurement room C air inlet 1.
Meanwhile, single-chip microcomputer sends the by the second magnetic valve SV2 control signal input point I1 to the second switching valve SV2
Binary signal, the second switching valve SV2 O2 is opened, so that reference gas is discharged in air by the O2 ends of the second switching valve, it is thus real
Now sample gas is passed through in measuring chamber C by the first switching valve SV1, and reference gas is discharged into air by the second switching valve SV2.
Similarly, can also be by the first switching valve SV1 by sample gas is by the N1 ends of the first switching valve and then is drained into air
In, while during reference gas is passed through into measuring chamber C from the N2 ends of the second switching valve by the second switching valve SV2.
The interval for sending control signal is set by single-chip microcomputer, reference gas and sample autogenous cutting are changed once, after then switching
Obtained sample gas or reference gas is input in measuring chamber C.Because sample gas replaces input measurement room C with reference gas, from measuring chamber C
The infrared ray that the luminous energy given off alternately changes, can make microflow sensor R produce two electric signals of alternately change.In two electricity
After the corresponding data stabilization of signal, the corresponding data of two electric signals are recorded respectively, according to the relation between two data, are determined by Bill
Rule computing draws the concentration of under test gas in sample gas, so as to realize that zero point is quickly compensated, and overcomes temperature to the shadow of microfluidic sensor
Ring.
D. permeation dryer unit
This unit is used to dehumidify to reference gas, including pump B, and wet reference gas is pumped into permeation dryer G.Also include
Permeation dryer G, it includes wet reference gas entrance 3, and wet reference gas is thence into permeation dryer；Reference gas outlet 4 is dried, is done
Reference gas after dry excludes drier from this；Blowback air entrance 5 is dried, blowback air is dried thence into permeation dryer；It is wet anti-
Flushing air outlet 6, wet blowback air excludes permeation dryer from this.
Dehumidification process schematic diagram is shown in Fig. 4.Permeation dryer G uses the drying principles of osmos tube, and dehumidifying driving force is in pipe
Outer psychrometric difference.As long as the inside and outside psychrometric difference of pipe is present, the migration of vapor with regard to carrying out all the time, it is therefore desirable to dry, clean, continuous
Blowback air (air or nitrogen) in the opposite side blowback of osmos tube, reference gas is dried with this osmos tube.
E. single-chip microcomputer
Single-chip microcomputer is used to control the first switching valve SV1 and the second switching valve SV2, sample gas or reference gas is replaced input measurement
Room C.
Single-chip microcomputer is additionally operable to handle the electric signal that microfluidic sensor R is produced, and it includes pre-amplification circuit, and micrometeor is passed
The electric signal that sensor is produced is amplified；A/D converter, data signal is converted into by the signal after amplification；Data operator is right
Data signal carries out computing, draws the concentration of under test gas in sample gas.
F. display unit
The concentration value of under test gas in sample gas is shown in screen by the display unit.
Reference gas and sample autogenous cutting are changed, are alternately input to infrared sensing by the present invention by the first switching valve, the second switching valve
In device unit, realize that the zero point of sensor is quickly compensated with this, so as to accurately measure.
In addition, after being removed water by way of permeable dehumidification to reference gas, moisture content about 0.03% or so,
The measurement result of the electric signal produced by the infrared light after reference gas will not be interfered.
The foregoing is only the preferable possible embodiments of the present invention, not for limiting to protection scope of the present invention, it is all according to
The equivalent changes and modifications that the present invention is done, should all belong to protection scope of the present invention.
Claims (10)
1. a kind of non-dispersion infrared gas analyzer of dynamic reference, including infrared light supply unit, infrared sensor unit, switching
Unit, wherein
A. the infrared light supply unit, for infrared light to be sent into the infrared sensor unit；
B. the infrared sensor unit, for measuring electric signal that unabsorbed infrared light produces, being absorbed after feux rouges
The electric signal of outer generation；
C. the switch unit, including the first switching valve and the second switching valve, first switching valve and the second switching valve are respectively wrapped
Include control circuit and magnetic valve；
First switching valve is used to sample gas being input in infrared sensor unit, and second switching valve is used for reference gas
It is input in infrared sensor unit, the sample gas and the reference gas are alternately input to the infrared sensor unit.
2. a kind of non-dispersion infrared gas analyzer of dynamic reference as claimed in claim 1, it is characterised in that also including oozing
Saturating dryer unit, the permeation dryer unit enters including wet reference gas entrance, dry reference gas outlet, dry blowback air
Mouth, the outlet of wet blowback air；Wherein, the dry blowback air entrance, which is located at, dries reference gas outlet side, and the wet blowback air goes out
Mouth is located at wet sample gas inlet side.
3. a kind of non-dispersion infrared gas analyzer of dynamic reference as claimed in claim 1, it is characterised in that the switching
The control circuit of valve is believed by voltage-stable transistor, general-purpose diode, light emitting diode, switch-over control signal input point, switching control
Number output point, resistance are constituted；
The colelctor electrode of the voltage-stable transistor connects the anode of the general-purpose diode, the base stage connection institute of the voltage-stable transistor
State the anode of light emitting diode；
The switch-over control signal input point is located between the voltage-stable transistor and the light emitting diode；
The switch-over control signal output point is located between the voltage-stable transistor and the general-purpose diode；
Resistance is in series between the voltage-stable transistor and light emitting diode.
4. a kind of non-dispersion infrared gas analyzer of dynamic reference as claimed in claim 1, it is characterised in that described infrared
Light source cell includes infrared light supply, light cutting device, motor；
The infrared light supply is used to give off infrared light, and the light cutting device is used to infrared light switching to pulsed light, the motor
It is fixed on light cutting device and drives light cutting device to rotate.
5. a kind of non-dispersion infrared gas analyzer of dynamic reference as claimed in claim 1, it is characterised in that described infrared
Sensor unit includes measuring chamber, detector；
The measuring chamber includes air inlet, exhaust outlet, and the air inlet is located at the two of the measuring appliance respectively with the exhaust outlet
End；
The detector, including preceding absorption chamber, rear absorption chamber, microflow sensor, the preceding absorption chamber pass through with rear absorption chamber
Pore insertion, the microflow sensor is positioned in the pore, and described microflow sensor is hot temperature difference type
Microflow sensor.
6. a kind of non-dispersion infrared gas analyzer of dynamic reference as claimed in claim 2, it is characterised in that the infiltration
Dryer unit also includes pump, and the pump is used to wet reference gas being pumped into permeation dryer.
7. a kind of non-dispersion infrared gas analyzer of dynamic reference as claimed in claim 1, it is characterised in that also including list
Piece machine, the single-chip microcomputer is used to control first magnetic valve and the second magnetic valve, and handles the infrared sensor unit
The electric signal of generation.
8. the non-dispersion infrared gas analyzer of a kind of dynamic reference as described in claim 1 or 7, it is characterised in that also wrap
Include power supply, display unit；
The power supply is used to power for the single-chip microcomputer；
The display unit, the concentration for showing under test gas in the sample gas obtained after the single-chip microcomputer processing electric signal.
9. a kind of non-dispersion infrared gas analyzer measurement gas concentration using dynamic reference as claimed in claim 1 or 2
Method, it comprises the following steps：
A. light is taken：Infrared light is launched by infrared light supply；
B. light absorbs：Alternately through reference gas, sample gas, wherein sample aspiration infrared light, reference gas does not absorb infrared to infrared light
Light；
C. luminous energy is detected：Detection passes through the electric signal that the infrared light after reference gas is produced, and detects by the infrared light after sample gas
The electric signal of generation；According to the relation of described two electric signals, the concentration of under test gas in sample gas is drawn by Beer law.
10. a kind of method of measurement gas concentration as claimed in claim 9, its is further comprising the steps of,
D. reference gas dehumidifies：Reference gas is injected from wet reference gas entrance and discharged from reference gas outlet is dried；Simultaneously by drying
Gas is removed the vapor in reference gas with this, then replaced from drying the injection of blowback air entrance and exporting discharge from wet blowback air
It is input in the infrared sensor unit.
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| CN108692994A (en) * | 2018-04-24 | 2018-10-23 | 中国石油天然气股份有限公司 | Device and method for monitoring carbon dioxide flux of gas-filled zone soil in gas injection oil displacement well site |
| CN113854997A (en) * | 2021-09-24 | 2021-12-31 | 中国科学院合肥物质科学研究院 | A device and method for examining lung diffusion function based on one breath method |
| CN115046952A (en) * | 2022-05-23 | 2022-09-13 | 上海宝英光电科技有限公司 | Detection signal processing method of element analyzer and gas detection device thereof |
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Application publication date: 20170811 |