CN108287142A - Gas real-time detection apparatus and method based on infrared photoacoustic spectra technology - Google Patents
Gas real-time detection apparatus and method based on infrared photoacoustic spectra technology Download PDFInfo
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- CN108287142A CN108287142A CN201810075269.4A CN201810075269A CN108287142A CN 108287142 A CN108287142 A CN 108287142A CN 201810075269 A CN201810075269 A CN 201810075269A CN 108287142 A CN108287142 A CN 108287142A
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- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 238000001834 photoacoustic spectrum Methods 0.000 title claims abstract description 15
- 238000011897 real-time detection Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 10
- 239000000523 sample Substances 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 16
- 239000010453 quartz Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 9
- 230000000740 bleeding effect Effects 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 1
- 238000004867 photoacoustic spectroscopy Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 235000013399 edible fruits Nutrition 0.000 description 5
- 238000004847 absorption spectroscopy Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000009659 non-destructive testing 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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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
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Abstract
The invention discloses a kind of gas real-time detection apparatus and method based on infrared photoacoustic spectra technology, using infrared light supply as probe source, enter integrating sphere after optical fiber collimator collimates, the object gas in gas chamber/outfield air is pumped into integrating sphere by aspiration pump, infrared light interacts with object gas in integrating sphere, finally it is incident in photoacoustic sensors, according to wavelength modulation principle, to obtain the concentration of object gas in discharge chamber/outfield air, and by liquid crystal display/warning device real-time display concentration value and judge whether to send out alarm.Present invention incorporates integrating sphere and optoacoustic spectroscopy, increase absorption journey is long, effectively increases detectivity, and can achieve the purpose that detect in real time.
Description
Technical field
The present invention relates to gas detection technologies, and in particular to a kind of gas based on infrared photoacoustic spectra technology detects in real time
Device and method.
Background technology
Infrared spectrum technology has been widely used for the detection of gas concentration, in environmental monitoring, agricultural and industrial development
In suffer from important role.And these detection systems are also just towards highly sensitive, high integration and high-timeliness development.
Traditional absorption spectroscopy techniques, such as direct absorption spectroscopy techniques, difference absorption spectrum technology, high-fineness resonant cavity
Absorption spectroscopy techniques etc., it is long that these methods are mostly limited to short absorption journey, although high-fineness resonant cavity can greatly increase
It is long to absorb journey, but there are strict requirements for the adjusting for entering angular and chamber.And the apparatus structure having is complicated, miniaturization
It is difficult.
Integrating sphere is compact-sized, and space occupancy is small, cheap, can be effectively increased absorb journey it is long, be well suited for for opening
Highly sensitive, inexpensive, miniaturization the gas-detecting device of hair.The concentration of gas can be effectively monitored using optoacoustic spectroscopy
Value, can effectively remind in conjunction with warning device and and guide people's behavior.
Invention content
The present invention provides one to solve the problem that multi-component gas detects and existing detection device sensitivity is low
The device and method that kind gas detects in real time, by the way that sample gas is pumped into integrating sphere, to reduce light institute in transmission process
The scattering of generation, reflection loss improve detection sensitivity, achieve the purpose that detect in real time.According to gas with various, generally there are not
Same absorption line obtains gas concentration using the analysis of optoacoustic spectroscopy combination wavelength-modulation technique, is environmental monitoring, agricultural development
Reliable data reference is provided.
To achieve the goals above, the present invention adopts the following technical scheme that.A kind of gas based on infrared photoacoustic spectra technology
Body real-time detection apparatus, including laser emitting module, optoacoustic detection module and signal processing module；
The laser emitting module includes light signal modulating device, light source controller and the infrared light supply for being corresponding in turn to connection；
The optoacoustic detection module includes aspiration pump, integrating sphere and gas chamber/outfield air, and the optoacoustic being equipped in the integrating sphere passes
Sensor, the integrating sphere are pumped into gas sample by the aspiration pump out of the gas chamber/outfield air；
The signal processing module includes sequentially connected preamplifier, lock-in amplifier, microcontroller and liquid crystal display/report
Alarm device, the preamplifier are connect with photoacoustic sensors, and the lock-in amplifier passes through data collecting card and microcontroller
It is connected, the liquid crystal display/warning device is sentenced for coming out the data result real-time display that microcontroller is handled
It is disconnected whether alarm；The signal that lock-in amplifier is used to amplify preamplifier demodulates；
The air inlet and bleeding point of the integrating sphere are managed by PFA be correspondingly connected with gas chamber/outfield air and aspiration pump respectively；Product
It is connected with optical fiber collimator between the light inlet and infrared light supply of bulb separation.
Further, the integrating sphere inner wall is coated with infrared high-reflecting film.
Further, the preamplifier is low-noise current amplifier, for current signal to be converted into voltage signal
And small-signal is amplified.
Further, the photoacoustic sensors are quartz tuning-fork, and quartz tuning-fork is fixed by the miniature resonance capillary of both sides
In in integrating sphere.
Further, the photoacoustic sensors are microphone, and are fixed among the resonant cavity in integrating sphere.
Further, the modulating frequency of the light signal modulating device must be adjusted to the resonance with quartz tuning-fork or microphone
Frequency is identical.
A kind of detection method using the gas real-time detection apparatus based on infrared photoacoustic spectra technology, its step are as follows：
1）The PFA pipes of the inlet port of integrating sphere are positioned in gas chamber to be measured/outfield air, aspiration pump is opened, makes gas to be measured
Body/outfield air is full of integrating sphere；Using wavelength modulation spectrum technology, light source controller is loaded with light signal modulating device
Modulated signal；The light that infrared light supply 3 sends out wavelength modulation is driven and controlled using light source controller；
2）By step 1）The laser of modulation is collimated by the optical fiber collimator of beam extremities, and is emitted into integrating sphere
It is interior；
3）Laser into integrating sphere is incident in photoacoustic sensors in integrating sphere after Multiple Scattering, and preamplifier will
The signal that photoacoustic sensors detect is amplified, and demodulates by lock-in amplifier to obtain second harmonic signal, is finally led to
It crosses high-speed data acquisition card and obtained second harmonic signal is transferred to microcontroller；
4）Microcontroller handles obtained second harmonic signal, obtains the pass between second harmonic signal and gas concentration
System, so that it is determined that gas concentration；
5）By step 4）Result shown by liquid crystal display and judge whether to send out alarm.
Advantage of the invention is that：1. combining integrating sphere and optoacoustic spectroscopy, and integrating sphere compact appearance is utilized, and
The advantages of there is no limit to laser light incident angle, can improve the degree of miniaturization of detection device to a certain extent；And it utilizes
Integrating sphere can also increase absorb journey it is long, effectively increase detectivity.2. belonging to non-destructive testing.It can be applied to fruit
Ripe detection field.Fruit maturity is monitored in real time according to the variation of ethylene concentration and realizes early warning, fruit quality will not be made
At influence.Also ethylene concentration can be discharged according to fruit to determine fruit storage, processing and traffic condition.3. transplantability is good.It can
To be fixed in gas chamber, it can also be positioned over the place convenient for observation, air inlet need to be only connected in gas chamber i.e. by PFA pipes
It can.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
In figure：1- light signal modulating devices, 2- light source controllers, 3- infrared light supplies, 4- optical fiber collimators, 5- entering lights
Mouth, 6- integrating spheres, 7- air inlets, 8- bleeding points, 9- aspiration pumps, 10- gas chambers/outfield air, 11- photoacoustic sensors, 12- are preposition
Amplifier, 13- lock-in amplifiers, 14- microcontrollers, 15- liquid crystal displays/warning device.
Specific implementation mode
Below in conjunction with drawings and examples, the present invention is further illustrated.It is a kind of based on infrared photoacoustic spectra technology
Gas real-time detection apparatus, including laser emitting module, optoacoustic detection module and signal processing module；The laser emitting module
Light signal modulating device 1, light source controller 2 and infrared light supply 3 including being corresponding in turn to connection；The optoacoustic detection module packet
Include aspiration pump 9, integrating sphere 6 and gas chamber/outfield air 10, the photoacoustic sensors 11 being equipped in the integrating sphere 6, the integrating sphere
6 are pumped into gas sample by the aspiration pump 9 out of the gas chamber/outfield air 10；The signal processing module includes successively
Preamplifier 12, lock-in amplifier 13, microcontroller 14 and the liquid crystal display/warning device 15 of connection, the preposition amplification
Device 12 is connect with photoacoustic sensors 11, and the lock-in amplifier 13 is connected by data collecting card with microcontroller 14, described
Liquid crystal display/warning device 15 is used to come out the data result real-time display that the processing of microcontroller 14 obtains, and judges whether
Alarm；The signal that lock-in amplifier 13 is used to amplify preamplifier 12 demodulates；The air inlet of the integrating sphere 6
7 and bleeding point 8 managed by PFA be correspondingly connected with gas chamber/outfield air 10 and aspiration pump 9 respectively；The light inlet 5 of integrating sphere 6 with
Optical fiber collimator 4 is connected between infrared light supply 3.
6 inner wall of the integrating sphere is coated with infrared high-reflecting film.The preamplifier 12 is low-noise current amplifier, is used for
Current signal is converted into voltage signal and amplifies small-signal.The photoacoustic sensors 11 are quartz tuning-fork, quartz tuning-fork
It is fixed in integrating sphere 6 by the miniature resonance capillary of both sides.The photoacoustic sensors 11 are microphone, and are fixed on integral
Among resonant cavity in ball 6.The modulating frequency of the light signal modulating device 1 must be adjusted to and quartz tuning-fork or microphone
Resonant frequency is identical.
A kind of detection method using the gas real-time detection apparatus based on infrared photoacoustic spectra technology, using infrared light supply
3 are used as probe source, enter integrating sphere 6 after the collimation of optical fiber collimator 4, will be in gas chamber/outfield air 10 by aspiration pump 9
Object gas is pumped into integrating sphere 6, and infrared light interaction in integrating sphere 6 with object gas is finally incident on light sound sensor
On device 11, the signal that photoacoustic sensors 11 are obtained then is amplified demodulation, according to wavelength modulation principle, to discharge chamber/
The concentration of object gas in outfield air 10, and by 15 real-time display concentration value of liquid crystal display/warning device and judge whether
Send out alarm；The infrared light is to generate modulated signal using light signal modulating device 1, is loaded into light source controller 2
Input terminal, light source controller 2 drive and control the light that infrared light supply 3 sends out wavelength modulation, and its step are as follows：
1）The PFA pipes at 7 end of air inlet of integrating sphere 6 are positioned in gas chamber to be measured/outfield air 10, aspiration pump 9 is opened, makes to wait for
It surveys gas/outfield air 10 and is full of integrating sphere 6；Using wavelength modulation spectrum technology, with light signal modulating device 1 to light source control
2 load-modulate signal of device processed；The light that infrared light supply 3 sends out wavelength modulation is driven and controlled using light source controller 2；
2）By step 1）The laser of modulation is collimated by the optical fiber collimator 4 of beam extremities, and is emitted into integrating sphere
In 6；
3）Laser into integrating sphere 6 is incident in photoacoustic sensors 11 after Multiple Scattering in the integrating sphere 6, preposition amplification
Photoacoustic sensors 11 are detected obtained signal and are amplified by device 12, and obtain second harmonic letter by the demodulation of lock-in amplifier 13
Number, obtained second harmonic signal is transferred to microcontroller 14 finally by high-speed data acquisition card；
4）Microcontroller 14 handles obtained second harmonic signal, obtains between second harmonic signal and gas concentration
Relationship, so that it is determined that gas concentration；
5）By step 4）Result shown by liquid crystal display and judge whether to send out alarm.
Embodiment 1：As shown in Figure 1, infrared light supply 3 is quantum cascade laser, light signal modulating device 1 is sent out for function
Raw device.It is inputted after the high_frequency sine wave Signal averaging that the low-frequency modulation signal that function generator generates is generated with lock-in amplifier 13
Onto light source controller 2, light source controller 2 drives and controls the laser that quantum cascade laser sends out wavelength modulation.Optoacoustic passes
Sensor 11 is quartz tuning-fork, is provided with miniature resonance capillary in integrating sphere 6, is fixed on the both sides of quartz tuning-fork.Locking phase is amplified
Device 13 is connected by data collecting card with microcontroller 14；The signal acquired is carried out analyzing processing by microcontroller 14, is obtained
To the relationship between second harmonic signal and gas concentration, so that it is determined that gas concentration, and pass through liquid crystal display and warning device
15 display results.
Embodiment 2：Infrared light supply 3 is Distributed Feedback Laser.Other are same as Example 1.
Embodiment 3：Infrared light supply 3 is CO2Laser, light signal modulating device 1 are chopper.Other and embodiment 1
It is identical.
Embodiment 4：Infrared light supply 3 is infrared LED, and light source controller 2 is that infrared LED controls chip.Other and embodiment 1
It is identical.
Embodiment 5：Photoacoustic sensors 11 are microphone.Other are same as Example 1.
The present invention is elaborated above in conjunction with drawings and examples, without departing from the purpose of the present invention,
Parameters in above-described embodiment can also be modified, to improve specific embodiment.
Claims (7)
1. a kind of gas real-time detection apparatus based on infrared photoacoustic spectra technology, which is characterized in that including laser emitting module,
Optoacoustic detection module and signal processing module；
The laser emitting module includes light signal modulating device, light source controller and the infrared light supply for being corresponding in turn to connection；
The optoacoustic detection module includes aspiration pump, integrating sphere and gas chamber/outfield air, and the optoacoustic being equipped in the integrating sphere passes
Sensor, the integrating sphere are pumped into gas sample by the aspiration pump out of the gas chamber/outfield air；
The signal processing module includes sequentially connected preamplifier, lock-in amplifier, microcontroller and liquid crystal display/report
Alarm device, the preamplifier are connect with photoacoustic sensors, and the lock-in amplifier passes through data collecting card and microcontroller
It is connected, the liquid crystal display/warning device is sentenced for coming out the data result real-time display that microcontroller is handled
It is disconnected whether alarm；The signal that lock-in amplifier is used to amplify preamplifier demodulates；
The air inlet and bleeding point of the integrating sphere are managed by PFA be correspondingly connected with gas chamber/outfield air and aspiration pump respectively；Product
It is connected with optical fiber collimator between the light inlet and infrared light supply of bulb separation.
2. the gas real-time detection apparatus according to claim 1 based on infrared photoacoustic spectra technology, which is characterized in that institute
It states integrating sphere inner wall and is coated with infrared high-reflecting film.
3. the gas real-time detection apparatus according to claim 1 based on infrared photoacoustic spectra technology, which is characterized in that institute
It is low-noise current amplifier to state preamplifier, for current signal to be converted into voltage signal and amplifies small-signal.
4. the gas real-time detection apparatus according to claim 1 based on infrared photoacoustic spectra technology, which is characterized in that institute
It is quartz tuning-fork to state photoacoustic sensors, and quartz tuning-fork is fixed on by the miniature resonance capillary of both sides in integrating sphere.
5. the gas real-time detection apparatus according to claim 1 based on infrared photoacoustic spectra technology, which is characterized in that institute
It is microphone to state photoacoustic sensors, and is fixed among the resonant cavity in integrating sphere.
6. the gas real-time detection apparatus according to claim 1 based on infrared photoacoustic spectra technology, which is characterized in that institute
Stating the modulating frequency of light signal modulating device must be adjusted to identical as the resonant frequency of quartz tuning-fork or microphone.
7. a kind of detection side of the gas real-time detection apparatus according to claim 1 based on infrared photoacoustic spectra technology
Method, which is characterized in that using infrared light supply as probe source, integrating sphere is entered after optical fiber collimator collimates, passes through pumping
Object gas in gas chamber/outfield air is pumped into integrating sphere by pump, and infrared light interacts with object gas in integrating sphere,
Finally it is incident in photoacoustic sensors, the signal that photoacoustic sensors are obtained then is amplified demodulation, according to wavelength modulation principle,
To obtain the concentration of object gas in discharge chamber/outfield air, and simultaneously by liquid crystal display/warning device real-time display concentration value
Judge whether to send out alarm；The infrared light is to generate modulated signal using light signal modulating device, is loaded into light source
Controller input terminal, light source controller drive and control the light that infrared light supply sends out wavelength modulation, and its step are as follows：
1）The PFA pipes of the inlet port of integrating sphere are positioned in gas chamber to be measured/outfield air, aspiration pump is opened, makes gas to be measured
Body/outfield air is full of integrating sphere；Using wavelength modulation spectrum technology, light source controller is loaded with light signal modulating device
Modulated signal；The light that infrared light supply 3 sends out wavelength modulation is driven and controlled using light source controller；
2）By step 1）The laser of modulation is collimated by the optical fiber collimator of beam extremities, and is emitted into integrating sphere
It is interior；
3）Laser into integrating sphere is incident in photoacoustic sensors in integrating sphere after Multiple Scattering, and preamplifier will
The signal that photoacoustic sensors detect is amplified, and demodulates by lock-in amplifier to obtain second harmonic signal, is finally led to
It crosses high-speed data acquisition card and obtained second harmonic signal is transferred to microcontroller；
4）Microcontroller handles obtained second harmonic signal, obtains the pass between second harmonic signal and gas concentration
System, so that it is determined that gas concentration；
5）By step 4）Result shown by liquid crystal display and judge whether to send out alarm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810075269.4A CN108287142A (en) | 2018-01-26 | 2018-01-26 | Gas real-time detection apparatus and method based on infrared photoacoustic spectra technology |
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| CN201810075269.4A CN108287142A (en) | 2018-01-26 | 2018-01-26 | Gas real-time detection apparatus and method based on infrared photoacoustic spectra technology |
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| CN108287142A true CN108287142A (en) | 2018-07-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612939A (en) * | 2019-01-24 | 2019-04-12 | 中国科学院长春光学精密机械与物理研究所 | Food deterioration degree-measuring system and detection method based on infrared absorption spectrum |
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Application publication date: 20180717 |