CN114414493A - Enhanced photoacoustic spectroscopy multi-component gas sensor device - Google Patents
Enhanced photoacoustic spectroscopy multi-component gas sensor device Download PDFInfo
- Publication number
- CN114414493A CN114414493A CN202210097762.2A CN202210097762A CN114414493A CN 114414493 A CN114414493 A CN 114414493A CN 202210097762 A CN202210097762 A CN 202210097762A CN 114414493 A CN114414493 A CN 114414493A
- Authority
- CN
- China
- Prior art keywords
- photoacoustic
- buffer cavity
- cavity
- resonant cavity
- gas sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004867 photoacoustic spectroscopy Methods 0.000 title claims abstract description 21
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 230000003321 amplification Effects 0.000 abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 4
- 238000004451 qualitative analysis Methods 0.000 abstract description 3
- 238000004445 quantitative analysis Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 38
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000010895 photoacoustic effect Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000001834 photoacoustic spectrum Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Images
Classifications
-
- 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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
-
- 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
-
- 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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Abstract
The invention discloses an enhanced photoacoustic spectroscopy multi-component gas sensor device which comprises a photoacoustic cell, a pulse laser, a detector, an amplifier, a demodulator, an oscilloscope and a computer, wherein the photoacoustic cell is communicated with the pulse laser through an optical fiber circuit, the optical fiber circuit is provided with a spectroscope and an energy meter, the photoacoustic cell is cylindrical and comprises a first buffer cavity and a second buffer cavity, a resonant cavity is arranged between the first buffer cavity and the second buffer cavity, the two ends of the resonant cavity are cup-shaped with gradually increased diameters, the middle part of the resonant cavity is provided with a microphone, and an entrance of the resonant cavity is provided with a photoacoustic filter. The enhanced photoacoustic spectroscopy multi-component gas sensor device adopting the structure performs qualitative and quantitative analysis on various gas components through the photoacoustic cell structure with higher amplification coefficient.
Description
Technical Field
The invention relates to the technical field of photoacoustic spectroscopy trace, in particular to an enhanced photoacoustic spectroscopy multi-component gas sensor device.
Background
The photoacoustic spectroscopy technology is a gas detection technology based on the principle that gas has selective absorption of infrared light of different wavelengths. According to the technology, the gas is mainly utilized to absorb the light and then generate thermal expansion, and further the input light is periodically modulated, so that the gas expansion is periodic to initiate sound waves, and a microphone is used for detecting the sound waves to realize gas sensing. However, the photoacoustic spectroscopy is very difficult to detect photoacoustic signals because the photoacoustic effect is very weak, and the application cost of the photoacoustic spectroscopy is high, so that the application of the photoacoustic spectroscopy is limited. The photoacoustic air chamber with the resonance type structure can generate resonance by enabling the photoacoustic signals to form standing waves, so that the photoacoustic signals are amplified, the photoacoustic air chamber is mainly applied to a cylindrical structure at present, the photoacoustic air chamber has a first-order longitudinal resonance effect, and is simple in structure and low in processing and manufacturing cost. However, the cylindrical photoacoustic cell still has a certain upper limit on the amplification of acoustic signals, so a photoacoustic spectroscopy gas detection structure for further amplifying acoustic signals is needed, and an efficient photoacoustic spectroscopy detection apparatus capable of detecting a plurality of gases is also urgently needed.
Disclosure of Invention
The invention aims to provide an enhanced photoacoustic spectroscopy multi-component gas sensor device which can be used for qualitatively and quantitatively analyzing a plurality of gas components through a photoacoustic cell structure with a higher amplification factor.
In order to achieve the above object, the present invention provides an enhanced photoacoustic spectroscopy multi-component gas sensor device, which comprises a photoacoustic cell, a pulse laser, a detector, an amplifier, a demodulator, an oscilloscope, and a computer, wherein the photoacoustic cell is communicated with the pulse laser through an optical fiber line, the optical fiber line is provided with the spectrometer and an energy meter, the photoacoustic cell is cylindrical, the photoacoustic cell comprises a first buffer chamber and a second buffer chamber, a resonant cavity is arranged between the first buffer chamber and the second buffer chamber, two ends of the resonant cavity are cup-shaped with gradually increasing diameters, the middle of the resonant cavity is provided with a microphone, an acousto-optic filter is arranged at an inlet of the resonant cavity, the side surface of the first buffer chamber is provided with an entrance window, the side surface of the second buffer chamber is provided with an exit window, and the top end of the first buffer chamber is provided with an air inlet, still be provided with pressure sensor on the inner wall of first cushion chamber, the top of second cushion chamber is provided with the gas outlet, still be provided with temperature sensor on the inner wall of second cushion chamber.
Preferably, the entrance window and the exit window are infrared-transmitting window pieces, and the infrared-transmitting window pieces are arranged at the Brewster angle.
Preferably, the detector is arranged on one side of the photoacoustic cell and faces the exit window, the detector is connected with the oscilloscope, the microphone, the demodulator and the oscilloscope are sequentially connected, and the oscilloscope, the pulse laser, the temperature sensor and the pressure sensor are all connected with a computer.
Therefore, the enhanced photoacoustic spectroscopy multi-component gas sensor device adopting the structure transmits pulse laser with certain frequency through the pulse laser, gas to be detected is filled into the photoacoustic cell and flows slowly in the resonant cavity, the resonant cavity adopts a cup-shaped structure with diameters gradually increased at two ends, the resonant performance is enhanced, and the temperature sensor and the pressure sensor are used for monitoring the environmental conditions in the buffer cavity to complete quantitative and qualitative analysis of various gas components.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an enhanced photoacoustic spectroscopy multi-component gas sensor apparatus according to the present invention;
fig. 2 is a schematic diagram of the internal structure of the photoacoustic cell according to the embodiment of the present invention.
Reference numerals
1. A photoacoustic cell; 11. a first buffer chamber; 12. a second buffer chamber; 13. an air inlet; 14. an air outlet; 15. a resonant cavity; 16. a microphone; 17. an entrance window; 18. an exit window; 19. an acousto-optic filter; 2. a pressure sensor; 3. a temperature sensor.
Detailed Description
The technical solution of the present invention is further illustrated by the accompanying drawings and examples.
Examples
As shown in the figure, the enhanced photoacoustic spectroscopy multi-component gas sensor device comprises a photoacoustic cell 1, a pulse laser, a detector, an amplifier, a demodulator, an oscilloscope and a computer, wherein the photoacoustic cell 1 is communicated with the pulse laser through an optical fiber line, the optical fiber line is provided with an optical splitter and an energy meter, the pulsed laser emitted by the pulse laser can be split and the energy of the pulsed laser can be monitored, and the specific gas component can be analyzed by controlling the pulsed laser.
The photoacoustic cell 1 is cylindrical, and the photoacoustic cell 1 includes first buffer chamber 11 and second buffer chamber 12, and the side of first buffer chamber 11 is provided with incident window 17, and the side of second buffer chamber 12 is provided with exit window 18, and incident window 17 and exit window 18 are infrared window piece that passes through, and infrared window piece that passes through is the setting of brewster's angle. The detector is arranged at one side of the photoacoustic cell 1 and towards the exit window 18. Pulse laser from a pulse laser enters from an entrance window 17 and then penetrates out from an exit window 18, a detector is connected with an oscilloscope, the detector receives 10% of energy of the pulse laser and feeds back through the oscilloscope to form a negative feedback closed loop, so that the light output power of the pulse laser is kept stable, and the influence of laser scattering and reflection on the photoacoustic effect of gas is avoided.
The photoacoustic cell 1 is also made of aluminum alloy material with relatively high thermal diffusivity so as to reduce possible interference signals. The photoacoustic cell 1 has a housing of sufficient thickness, about 10mm, to provide good acoustic shielding and insulation. The inner surface of the cell 1 is smooth and is achieved by a polishing process to avoid excessive attenuation of the acoustic signal before transmission to the microphone 16.
The top end of the first buffer cavity 11 is provided with an air inlet 13, the top end of the second buffer cavity 12 is provided with an air outlet 14, the inner wall of the first buffer cavity 11 is further provided with a pressure sensor 2, and the inner wall of the second buffer cavity 12 is further provided with a temperature sensor 3. The infrared absorption characteristic of gas is the theoretical basis for analyzing gas by using infrared optical technology, and the photoacoustic spectrum is mainly used for qualitatively and quantitatively analyzing gas according to the shape, position and intensity of gas molecular absorption spectral lines. The main influencing factors for the gas during the measurement are the pressure and the temperature. In order to avoid gas leakage caused by poor air tightness of the photoacoustic cell 1, the gas slowly flows through the photoacoustic cell 1 by adopting a flowing gas method, the pressure in the resonant cavity 15 is stabilized at 0.1MPa, the temperature is controlled at 26 ℃, and the absorption coefficient of the gas is kept to be maximum.
A resonant cavity 15 is arranged between the first buffer chamber and the second buffer chamber, a microphone 16 is arranged in the middle of the resonant cavity 15, two ends of the resonant cavity 15 are cup-shaped with gradually increasing diameters, and an acousto-optic filter 19 is arranged at the inlet of the resonant cavity 15. The existing resonant cavity 15 is generally in a cylindrical shape with uniform diameter, the amplification factor of sound waves is limited, the resonant cavity 15 with cup-shaped two ends is adopted, and the length of the resonant cavity 15 is enlarged, so that the sound waves can be amplified better. The acousto-optic filter 19 is capable of filtering a specified noise or a certain type of sound wave so that the microphone 16 receives only sound waves of a certain wavelength, thereby realizing a differential analysis of gas components. After entering from the gas inlet 13, the gas to be measured slowly flows into the first buffer cavity 11, the resonant cavity 15 and the second buffer cavity 12, and flows out from the gas outlet 14. When the gas passes through the resonant cavity 15, the gas absorbs energy under the action of the pulse laser and generates sound waves, the sound wave signals are received by the microphone 16, the demodulator and the oscilloscope are sequentially connected, the microphone 16 converts the sound wave signals into voltage signals, and the demodulator smoothes the sound wave voltage signals and displays the voltage signals by the oscilloscope. The oscilloscope, the pulse laser, the temperature sensor 3 and the pressure sensor 2 are all connected with a computer, and control, data recording and analysis are completed through the computer.
Therefore, the enhanced photoacoustic spectroscopy multi-component gas sensor device adopting the structure transmits pulse laser with a certain frequency through the pulse laser, gas to be detected is filled into the photoacoustic cell 1 and flows slowly in the resonant cavity 15, the resonant cavity 15 adopts a cup-shaped structure with diameters gradually increased at two ends, resonance performance is enhanced, and the environmental conditions in the buffer cavity are monitored through the temperature sensor 3 and the pressure sensor 2, so that quantitative and qualitative analysis of various gas components is completed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (3)
1. An enhanced photoacoustic spectroscopy multi-component gas sensor apparatus, comprising: the photoacoustic cell is communicated with the pulse laser through an optical fiber circuit, a beam splitter and an energy meter are arranged on the optical fiber circuit, the photoacoustic cell is cylindrical and comprises a first buffer cavity and a second buffer cavity, a resonant cavity is arranged between the first buffer cavity and the second buffer cavity, the two ends of the resonant cavity are cup-shaped with gradually increasing diameters, a microphone is arranged in the middle of the resonant cavity, an acousto-optic filter is arranged at the inlet of the resonant cavity, an incident window is arranged on the side surface of the first buffer cavity, an exit window is arranged on the side surface of the second buffer cavity, an air inlet is arranged at the top end of the first buffer cavity, a pressure sensor is further arranged on the inner wall of the first buffer cavity, and an air outlet is arranged at the top end of the second buffer cavity, and a temperature sensor is also arranged on the inner wall of the second buffer cavity.
2. An enhanced photoacoustic spectroscopy multi-component gas sensor apparatus according to claim 1, wherein: the entrance window and the exit window are infrared-transmitting window sheets which are arranged at Brewster angles.
3. An enhanced photoacoustic spectroscopy multi-component gas sensor apparatus according to claim 1, wherein: the detector is arranged on one side of the photoacoustic cell and faces the exit window, the detector is connected with the oscilloscope, the microphone, the demodulator and the oscilloscope are sequentially connected, and the oscilloscope, the pulse laser, the temperature sensor and the pressure sensor are all connected with a computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210097762.2A CN114414493A (en) | 2022-01-27 | 2022-01-27 | Enhanced photoacoustic spectroscopy multi-component gas sensor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210097762.2A CN114414493A (en) | 2022-01-27 | 2022-01-27 | Enhanced photoacoustic spectroscopy multi-component gas sensor device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114414493A true CN114414493A (en) | 2022-04-29 |
Family
ID=81278913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210097762.2A Pending CN114414493A (en) | 2022-01-27 | 2022-01-27 | Enhanced photoacoustic spectroscopy multi-component gas sensor device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114414493A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115586151A (en) * | 2022-09-28 | 2023-01-10 | 国网湖北省电力有限公司电力科学研究院 | SF6 decomposition product on-line monitoring device based on laser photoacoustic spectroscopy technology |
| CN115656039A (en) * | 2022-10-11 | 2023-01-31 | 国网湖北省电力有限公司电力科学研究院 | Anti-interference SF6 gas decomposition product detection device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813621A (en) * | 2009-02-19 | 2010-08-25 | 中国科学院安徽光学精密机械研究所 | Quartz tuning fork strengthened photoacoustic spectroscopy gas sensor based on acoustic resonator |
| CN101949821A (en) * | 2010-08-12 | 2011-01-19 | 重庆大学 | Longitudinal resonant photoacoustic pool for photoacoustic spectrometry monitoring of gases |
| CN110095413A (en) * | 2019-05-21 | 2019-08-06 | 安徽理工大学 | A kind of modular construction photoacoustic cell suitable for Laser Photoacoustic Spectroscopy detection |
| CN114689517A (en) * | 2022-05-05 | 2022-07-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Horn-shaped photoacoustic cell for gas photoacoustic spectrum detection |
-
2022
- 2022-01-27 CN CN202210097762.2A patent/CN114414493A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813621A (en) * | 2009-02-19 | 2010-08-25 | 中国科学院安徽光学精密机械研究所 | Quartz tuning fork strengthened photoacoustic spectroscopy gas sensor based on acoustic resonator |
| CN101949821A (en) * | 2010-08-12 | 2011-01-19 | 重庆大学 | Longitudinal resonant photoacoustic pool for photoacoustic spectrometry monitoring of gases |
| CN110095413A (en) * | 2019-05-21 | 2019-08-06 | 安徽理工大学 | A kind of modular construction photoacoustic cell suitable for Laser Photoacoustic Spectroscopy detection |
| CN114689517A (en) * | 2022-05-05 | 2022-07-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Horn-shaped photoacoustic cell for gas photoacoustic spectrum detection |
Non-Patent Citations (1)
| Title |
|---|
| 李泽昊: "曲体束腰型光声池的设计及性能分析", 中国激光, pages 1 - 10 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115586151A (en) * | 2022-09-28 | 2023-01-10 | 国网湖北省电力有限公司电力科学研究院 | SF6 decomposition product on-line monitoring device based on laser photoacoustic spectroscopy technology |
| CN115656039A (en) * | 2022-10-11 | 2023-01-31 | 国网湖北省电力有限公司电力科学研究院 | Anti-interference SF6 gas decomposition product detection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114414493A (en) | Enhanced photoacoustic spectroscopy multi-component gas sensor device | |
| US7782462B2 (en) | Sono-photonic gas sensor | |
| CN104280340B (en) | The gas detection apparatus based on LED light source and using electricity modulation phase resolving therapy and method | |
| CN105259116A (en) | Trace gas measurement device and method with adoption of photo-acoustic spectroscopy | |
| CN107560730A (en) | Bicavate photo-acoustic spectrometer | |
| CN211602897U (en) | Photoacoustic cell structure in photoacoustic spectrum oil gas detection device | |
| CN106872402A (en) | Gas-detecting device and method based on super continuous spectrums laser | |
| CN104237154A (en) | Device for detecting methane and carbon dioxide in atmospheric greenhouse gas based on photoacoustic spectrum technology | |
| CN105466854A (en) | Active air-chamber structure and photoacoustic spectrometry gas sensing system | |
| CN110686771A (en) | Photoacoustic effect-based wide-spectrum pulse light detector and detection method | |
| CN109269999A (en) | A kind of infrared photoacoustic spectra detection system | |
| CN112924388B (en) | Orthogonal double-channel acoustic resonance device | |
| CN106092899A (en) | A kind of based on CO2the self calibration of laser instrument measures SF6the device and method of concentration | |
| WO2024045341A1 (en) | Photoacoustic spectrometry-based gas testing apparatus | |
| CN111103260A (en) | System and method for detecting intermediate infrared all-fiber cavity ring-down trace gas | |
| CN110542839A (en) | All-optical insulation fault monitoring system for SF6 gas insulation equipment | |
| CN103487392B (en) | Frequency domain cavity ring-down spectroscopy detection apparatus and method | |
| WO2017068301A1 (en) | Gas-detecting device with very high sensitivity based on a helmholtz resonator | |
| Petzold et al. | Novel design of a resonant photoacoustic spectrophone for elemental carbon mass monitoring | |
| CN114965357A (en) | Methyl ethyl alkane double-gas detection method and device based on TDLAS | |
| US4048499A (en) | Infrared absorption spectroscopy of liquids employing a thermal detector | |
| CN209495963U (en) | A kind of infrared photoacoustic spectra detection system | |
| CN108398393B (en) | Optical cavity ring-down spectrometer and measuring method for rapidly measuring greenhouse gas content | |
| CN116183538A (en) | Infrared light sound spectrum gas concentration detection device based on non-resonance type photoacoustic cell | |
| US3987304A (en) | Infrared absorption spectroscopy employing an optoacoustic cell for monitoring flowing streams |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220429 |