CN108593763B - Real-time detection device for multi-component gas based on quartz tuning fork frequency division demodulation - Google Patents
Real-time detection device for multi-component gas based on quartz tuning fork frequency division demodulation Download PDFInfo
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- CN108593763B CN108593763B CN201810257662.5A CN201810257662A CN108593763B CN 108593763 B CN108593763 B CN 108593763B CN 201810257662 A CN201810257662 A CN 201810257662A CN 108593763 B CN108593763 B CN 108593763B
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- 239000010453 quartz Substances 0.000 title claims abstract description 69
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000011897 real-time detection Methods 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 43
- 239000013307 optical fiber Substances 0.000 claims abstract description 14
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000001629 suppression Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 230000035790 physiological processes and functions Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/022—Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/021—Gases
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Abstract
A multi-component gas real-time detection device based on quartz tuning fork frequency division demodulation belongs to the field of gas sensing. The device comprises a laser control module, a DFB laser, a gas chamber, a quartz tuning fork, a preamplifier, a phase-locked amplifier and the like. The laser control module is connected with three DFB lasers, the output ends of the three DFB lasers are connected with the optical fiber coupler, the output end of the optical fiber coupler is connected with the collimator in the air chamber, light emitted by the collimator sequentially passes through the resonance tube a, the three quartz tuning forks and the resonance tube b, the three quartz tuning forks are connected with the input end of the preamplifier, the output end of the preamplifier is connected with the input end of the phase-locked amplifier, and the output end of the phase-locked amplifier is connected with the computer. The device can realize the simultaneous measurement of various gases and has the advantages of simple structure, high sensitivity and the like.
Description
Technical Field
The invention relates to a real-time detection device for multi-component gas, in particular to a real-time detection device for multi-component gas based on quartz tuning fork frequency division demodulation. Belongs to the technical field of optical fiber gas sensing detection.
Background
The multi-component gas detection technology has important practical significance in the fields of human daily life, atmospheric environmental pollution monitoring, industrial development, aerospace, biological tissue physiological process research, human disease diagnosis and the like. The traditional detection methods mainly utilize the physical and chemical properties of gas or the electrochemical properties of the gas for detection, including methods such as a catalytic combustion method, a gas sensor method, an electrolyte method and the like, which can be applied to gas detection in some common occasions, but most of the methods have the defects of low detection precision, low flexibility, easy environmental interference and the like, and cannot meet the requirements of multi-component gas monitoring at present. The multi-component gas detection method based on the photoacoustic spectroscopy receives more and more attention because of the advantages of high detection precision, good stability, high sensitivity and the like.
Computer knowledge and technology, 2014, 30 vol, 34 th, 81848190, wherein the author is Zhao xing, Li Xiaoxia and Li Yong, and an article entitled application of a phase-locked amplifier based on FPGA in multi-component gas detection proposes a multi-component photoacoustic spectroscopy gas detection technology based on time division multiplexing, and lasers with different central wavelengths are output in a time-sharing manner by adjusting the wavelength of a light source, so that the structure cannot realize real-time monitoring on various gases, and a microphone used as a sound detection element has wide response frequency bandwidth and is easily interfered by external noise.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides a multi-component gas real-time detection device based on quartz tuning fork frequency division demodulation.
The technical scheme of the invention is realized by the following modes:
a real-time detection device for multicomponent gas based on quartz tuning fork frequency division demodulation comprises a laser control module, a DFB laser a, a DFB laser b, a DFB laser c, a 3X 1 optical fiber coupler, a gas chamber, a collimator, a resonance tube a, a quartz tuning fork b, a quartz tuning fork c, a resonance tube b, a preamplifier, a lock-in amplifier and a computer, and is characterized in that the laser control module is respectively connected with the DFB lasers a, b and c, the output ends of the DFB lasers a, b and c are connected with three input ends of the 3X 1 optical fiber coupler, the output end of the 3X 1 optical fiber coupler is connected with the collimator, the collimator is arranged at the front end inlet of the gas chamber, the resonance tube a, the quartz tuning fork b, the quartz tuning fork c and the resonance tube b are sequentially arranged on a light path of the collimator, and the quartz tuning fork a and a are sequentially arranged on the light path, The quartz tuning fork b, the quartz tuning fork c and the resonance tube b are all arranged in the gas chamber; the signal output ends of the quartz tuning forks a, b and c are respectively connected to the input end of a preamplifier, the output end of the preamplifier is connected with the input end of a phase-locked amplifier, and the output end of the phase-locked amplifier is connected to a computer.
The center wavelengths of the DFB lasers a, b and c are different and respectively correspond to the gas absorption peak wavelengths of different gases to be detected.
The quartz tuning forks a, b and c are commonly used 3-8 straight inserted cylindrical bare tuning forks with shell removed, and the response frequencies of the tuning forks are different.
The modulation frequencies of the DFB lasers a, b and c respectively correspond to half of the response frequencies of the quartz tuning forks a, b and c.
The length L of the resonance tubes a and b satisfies lambdamax/4＜L＜λminV/f, wherein v is sound speed, and f is response frequency of the quartz tuning fork; lambda [ alpha ]minIs the minimum acoustic wave wavelength, lambda, corresponding to the response frequencies of the three quartz tuning forksmaxThe maximum acoustic wave wavelength corresponding to the response frequency of the three quartz tuning forks; the material is glass or steel.
The diameter d of the laser beam emitted by the collimator after passing through the three quartz tuning forks and the two resonance tubes meets the requirement that d is less than 0.3 mm.
When the device works, the laser control module drives DFB lasers a, b and c with different central wavelengths respectively at different modulation frequencies, the DFB lasers a, b and c respectively correspond to half of response frequencies of quartz tuning forks a, b and c, the optical fiber coupler synthesizes the lasers output by the DFB lasers a, b and c into one beam, the laser beam is collimated and converged by the collimator and then sequentially passes through the resonance tube a, the quartz tuning fork b, the quartz tuning fork c and the resonance tube b in an air chamber, light with different modulation frequencies is absorbed by corresponding gas molecules to generate sound waves, the quartz tuning fork responds to the sound waves with corresponding frequencies, the resonance tubes a and b are used for amplifying sound signals, the quartz tuning fork vibrates to generate current signals by a piezoelectric effect, the preamplifier converts the current signals into voltage signals, the voltage signals are demodulated by the phase-locked amplifier, and three reference signals of the phase-locked amplifier respectively correspond to the quartz tuning fork a, b, c and, b. c, the response frequency can display the magnitude of the detected gas signal through computer detection and calculation.
The detection device has the beneficial effects that: the modulation frequencies of the DFB lasers with the central wavelengths corresponding to different gas absorption peaks are different, so that the frequency of the sound waves generated after the sound waves are absorbed by specific gas molecules is different, and only quartz tuning forks with corresponding frequencies can vibrate, and real-time measurement of multi-component gas is realized. The detection device has the advantages of simple structure, high sensitivity, strong noise suppression capability and the like.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the detecting device of the present invention.
The system comprises a laser control module 1, a DFB laser a2, a DFB laser b3, a DFB laser c4, a 5.3 x 1 optical fiber coupler, a gas chamber 6, a collimator 7, a resonance tube a, a quartz tuning fork a9, a quartz tuning fork b10, a quartz tuning fork c11, a resonance tube b, a preamplifier 13, a phase-locked amplifier 14 and a computer 15.
Detailed Description
The invention is further described below, but not limited to, with reference to the following figures and examples.
Example (b):
the embodiment of the invention is shown in fig. 1, and the real-time detection device for multicomponent gas based on quartz tuning fork frequency division demodulation comprises a laser control module 1, a DFB laser a2, a DFB laser b3, a DFB laser c4, a 3 × 1 optical fiber coupler 5, an air chamber 6, a collimator 7, a resonance tube a8, a quartz tuning fork a9, a quartz tuning fork b10, a quartz tuning fork c11, a resonance tube b12, a preamplifier 13, a lock-in amplifier 14 and a computer 15. The laser control module 1 is respectively connected with DFB lasers a2, b3 and c4, the output ends of the DFB lasers a2, b3 and c4 are connected with three input ends of a 3 × 1 optical fiber coupler 5, the output end of the 3 × 1 optical fiber coupler 5 is connected with a collimator 7, the collimator 7 is arranged at the front end inlet of an air chamber 6, a resonance tube a8, a quartz tuning fork a9, a quartz tuning fork b10, a quartz tuning fork c11 and a resonance tube b12 are sequentially arranged on a light ray emergent square light path of the collimator 7, a resonance tube a8, a quartz tuning fork a9, a quartz tuning fork b10, a quartz tuning fork c11 and a resonance tube b12 are arranged in the air chamber 6, signal output ends of the quartz tuning forks a9, b10 and c11 are connected with the input end of a preamplifier 13, the output end of the preamplifier 13 is connected with the input end of a phase-locked amplifier 14, and the output end of the phase-locked amplifier 14 is connected with.
The center wavelengths of the DFB lasers a2, b3 and c4 are 1368.597nm, 1530.37nm and 1653.722nm respectively, and the center wavelengths correspond to the absorption peak wavelengths of water vapor, acetylene and methane respectively.
The response frequencies of the quartz tuning forks a9, b10 and c11 are 30.72kHz, 32kHz and 32.768kHz respectively.
The modulation frequencies of the DFB lasers a2, b3 and c4 are respectively 15.36kHz, 16kHz and 16.384 kHz.
The length L of the resonance tubes a8 and b12 is 4 mm. The material is glass.
The working distance of the collimator 7 is 2.2cm, and the beam diameter d of laser emitted by the collimator 7 after passing through the three quartz tuning forks and the two resonance tubes meets the requirement that d is less than 0.3 mm.
Claims (6)
1. A real-time detection device for multicomponent gas based on quartz tuning fork frequency division demodulation comprises a laser control module, a DFB laser a, a DFB laser b, a DFB laser c, a 3X 1 optical fiber coupler, a gas chamber, a collimator, a resonance tube a, a quartz tuning fork b, a quartz tuning fork c, a resonance tube b, a preamplifier, a lock-in amplifier and a computer, and is characterized in that the laser control module is respectively connected with the DFB lasers a, b and c, the output ends of the DFB lasers a, b and c are connected with three input ends of the 3X 1 optical fiber coupler, the output end of the 3X 1 optical fiber coupler is connected with the collimator, the collimator is arranged at the front end inlet of the gas chamber, the resonance tube a, the quartz tuning fork b, the quartz tuning fork c and the resonance tube b are sequentially arranged on a light path of the collimator, and the resonance tube a, the DFB, the quartz tuning, The quartz tuning fork a, the quartz tuning fork b, the quartz tuning fork c and the resonance tube b are all arranged in the gas chamber; the signal output ends of the quartz tuning forks a, b and c are respectively connected to the input end of a preamplifier, the output end of the preamplifier is connected with the input end of a phase-locked amplifier, and the output end of the phase-locked amplifier is connected to a computer;
the response frequencies of the quartz tuning fork a, the quartz tuning fork b and the quartz tuning fork c are respectively 30.72kHz, 32kHz and 32.768 kHz; the modulation frequencies of the DFB lasers with the central wavelengths corresponding to different gas absorption peaks are different, so that the frequency of the sound wave generated after the sound wave is absorbed by specific gas molecules is different, and only quartz tuning forks with corresponding frequencies can vibrate, so that the noise suppression capability is enhanced.
2. The real-time detection device for multicomponent gases based on quartz tuning fork frequency division demodulation as claimed in claim 1, wherein the center wavelengths of the DFB lasers a, b, c are different and respectively correspond to the gas absorption peak wavelengths of different gases to be detected.
3. The real-time detection device for multicomponent gases based on quartz tuning fork frequency division demodulation of claim 1, wherein the quartz tuning forks a, b and c are commonly used 3 x 8 straight-inserted cylindrical bare tuning forks with different response frequencies.
4. The apparatus according to claim 1, wherein the modulation frequencies of the DFB lasers a, b and c correspond to half of the response frequencies of the quartz tuning forks a, b and c, respectively.
5. The apparatus according to claim 1, wherein the length L of the resonance tubes a and b satisfies λmax/4<L<λminV/f, wherein v is sound speed, and f is response frequency of the quartz tuning fork; lambda [ alpha ]minIs the minimum acoustic wave wavelength, lambda, corresponding to the response frequencies of the three quartz tuning forksmaxThe maximum acoustic wave wavelength corresponding to the response frequency of the three quartz tuning forks; the material is glass or steel.
6. The real-time detection device for multicomponent gas based on quartz tuning fork frequency division demodulation according to claim 1, wherein the beam diameter d of the laser emitted from the collimator after passing through the three quartz tuning forks and the two resonance tubes satisfies d <0.3 mm.
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| CN112384785A (en) * | 2018-05-11 | 2021-02-19 | 开利公司 | Photoacoustic detection system |
| CN110196237A (en) * | 2019-06-25 | 2019-09-03 | 国网江苏省电力有限公司 | A kind of SF6Decomposition product multi-analyte immunoassay system and method |
| CN113267453B (en) * | 2021-03-30 | 2023-03-03 | 安徽工程大学 | Passive tuning fork resonance enhanced all-fiber three-gas detection photoacoustic spectroscopy system and detection method thereof |
| CN113281262B (en) * | 2021-03-30 | 2023-03-03 | 安徽工程大学 | All-fiber double-gas synchronous detection photoacoustic spectroscopy system based on passive tuning fork and detection method thereof |
| CN112881299B (en) * | 2021-03-30 | 2023-03-03 | 安徽工程大学 | Interference type all-fiber photoacoustic spectroscopy system based on passive tuning fork and detection method thereof |
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