CN114166757A - Multifunctional mixed gas photoacoustic detection device and method - Google Patents
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 230000009471 action Effects 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 112
- 230000003287 optical effect Effects 0.000 claims description 22
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 230000002146 bilateral effect Effects 0.000 claims 1
- 229910052691 Erbium Inorganic materials 0.000 description 10
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 10
- 238000000354 decomposition reaction Methods 0.000 description 8
- 229910018503 SF6 Inorganic materials 0.000 description 7
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 101000856246 Arabidopsis thaliana Cleavage stimulation factor subunit 77 Proteins 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- LSJNBGSOIVSBBR-UHFFFAOYSA-N thionyl fluoride Chemical compound FS(F)=O LSJNBGSOIVSBBR-UHFFFAOYSA-N 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000000180 cavity ring-down spectroscopy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000001285 laser absorption spectroscopy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
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- 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
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Abstract
The invention provides a multifunctional mixed gas photoacoustic detection device and method.A signal generator modulates frequency and sends out rectangular wave voltage signals according to gas to be detected, a quantum cascade laser generates infrared laser with a certain wavelength according to corresponding signals and through temperature control setting temperature, the laser wavelength corresponds to the type of the gas to be detected, and an erbium-doped fiber amplifier enhances the laser power generated by the laser. The gas to be detected in the photoacoustic cell and infrared laser generate photoacoustic action to cause the air pressure in the photoacoustic cell to change, a microphone is used for detecting a sound pressure signal in the photoacoustic cell, a corresponding preamplifier is used for amplifying the sound pressure electric signal and then transmitting the sound pressure electric signal to a phase-locked amplifier, the phase-locked amplifier is used for converting the sound pressure electric signal into a photoacoustic signal related to the gas concentration, and the gas concentration of each component of the detected gas is obtained after the photoacoustic signal is processed by an upper computer. The photoacoustic detection device and the photoacoustic detection method provided by the invention realize the simultaneity and the accuracy of detection.
Description
Technical Field
The invention relates to the field of gas detection, in particular to a multifunctional mixed gas photoacoustic detection device and method.
Background
The photoacoustic spectrometry is an indirect spectrometry mode, is used for detecting the part of energy which is generated after gas absorbs optical energy and expressed in the form of sound pressure, has the advantages of strong anti-electromagnetic interference capability, high sensitivity and the like, and has better anti-interference capability compared with two direct spectrometry modes, namely tunable semiconductor laser absorption spectrometry and cavity ring-down spectrometry.
Photoacoustic spectroscopy gas detection technology has become more and more popular with researchers in recent years. Research shows that the concentration of the decomposition component gas in sulfur hexafluoride electric power equipment can be used for evaluating the electric power equipmentEvaluation basis of the operating state. Thus for SF6Insulation equipment, decomposition composition analysis has also been a research hotspot for many years. But for SF6The detection and study of decomposition components is more confined to institutes or laboratories.
Disclosure of Invention
When the SF6 decomposition component is monitored on site, the monitoring simultaneity and the monitoring accuracy are very important in consideration of the complex environment on site and the different types and contents of the decomposition component gases generated at different parts when the power equipment storing the SF6 gas breaks down.
The invention provides an effective multifunctional mixed gas photoacoustic detection device and method starting from the field of power equipment, and the device and method are used for sulfur hexafluoride (SF)6And detecting gas of the gas decomposition component.
Specifically, the invention provides a multifunctional mixed gas photoacoustic detection device, which comprises: the device comprises a quantum cascade laser, an erbium-doped fiber amplifier, a first photoacoustic cell, a second photoacoustic cell, a third photoacoustic cell, a phase-locked amplifier, a signal generator and an upper computer; the quantum cascade laser generates infrared laser according to a signal generator, and the laser generates photoacoustic action with gas to be detected in the photoacoustic cell after being amplified by the erbium-doped fiber amplifier, so that the concentration of the corresponding gas in the input gas to be detected is detected.
Preferably, the signal generator modulates the frequency and sends out a rectangular wave voltage signal according to the gas to be detected, the quantum cascade laser sets the temperature through temperature control according to the corresponding signal and generates infrared laser with a certain wavelength, and the laser wavelength corresponds to the type of the gas to be detected.
Preferably, each of the photoacoustic cells includes an air inlet, an air outlet, a microphone, and a preamplifier. The detection gas is introduced into the photoacoustic cell through the gas inlet, the gas to be detected in the photoacoustic cell and the infrared laser generate photoacoustic action to cause the air pressure in the photoacoustic cell to change, the sound pressure signal in the photoacoustic cell is detected through the microphone, and the sound pressure electric signal is amplified through the corresponding preamplifier.
Preferably, the sound pressure signal is transmitted to a lock-in amplifier, demodulated by the lock-in amplifier, converted into a photoacoustic signal related to gas concentration, and transmitted to an upper computer, and the upper computer processes the photoacoustic signal to obtain the gas concentration of each component of the detected gas.
Preferably, the erbium-doped fiber amplifier comprises an isolator, a wave combiner, detectors and erbium-doped fibers, wherein the wave combiner and the isolator are symmetrically and sequentially arranged on two sides of each erbium-doped fiber, and the two detectors are respectively connected with the wave combiner and used for enhancing the laser power generated by the laser.
Preferably, the isolator is configured to ensure unidirectional transmission of optical signals, the combiner couples an input weak optical signal to be amplified and an optical wave output by the light source into the same optical fiber, the detector detects a position and an intensity of an optical signal spectral line, and the erbium-doped optical fiber is configured to amplify the optical signal.
The invention further provides a corresponding multifunctional mixed gas photoacoustic detection method, and the detection device is respectively used for detecting the decomposed component gas of the power equipment, the mixed gas component of the power equipment and the decomposed gas component at different positions of the power equipment.
The invention starts from the field of power equipment, and can realize the monitoring simultaneity and accuracy by considering the complex environment of the field. The laser power is enhanced by adopting an EDFA (erbium doped fiber amplifier), so that the final photoacoustic signal is greatly improved, and the detection limit of gas is improved. When monitoring of certain decomposed component gas of the power equipment is carried out, the same gas is detected three times through the three photoacoustic cells, and the accuracy of a detection result is ensured. In addition, the device can simultaneously detect the gas components at different positions of the power equipment, and has high detection efficiency and accurate detection result.
Drawings
Fig. 1 is a schematic diagram of a multifunctional mixed gas photoacoustic detection apparatus of the present invention.
Fig. 2 is a schematic view of the structure of an EDFA (erbium doped fiber amplifier) of the present invention.
FIG. 3 is a schematic diagram of the detection of a decomposition component gas in an electrical power plant of the present invention.
FIG. 4 is a schematic diagram of the detection of the decomposed component gas at different locations of the power plant of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step based on the spirit of the present invention are within the scope of the present invention.
As shown in fig. 1, the multifunctional mixed gas photoacoustic detection apparatus of the present invention includes: the device comprises a Quantum Cascade Laser (QCL)1, an EDFA (erbium doped fiber amplifier) 2, a first photoacoustic cell 3, a second photoacoustic cell 4, a third photoacoustic cell 5, a phase-locked amplifier 11, a signal generator 12 and an upper computer 13.
Each photoacoustic cell includes an air inlet 7, an air outlet 8, a microphone 9, and a preamplifier 10.
The signal generator 12 modulates the frequency and emits a rectangular wave voltage signal according to the gas to be detected, and the Quantum Cascade Laser (QCL)1 sets the temperature through temperature control according to the corresponding signal to generate infrared laser with a certain wavelength, wherein the wavelength of the laser corresponds to the type of the gas to be detected. The laser wavelength should be 7426nm as measured into the SOF2 gas.
The detection gas is introduced into the photoacoustic cell through the gas inlet 7, the gas to be detected in the photoacoustic cell and the infrared laser generate photoacoustic action to cause the air pressure in the photoacoustic cell to change, the sound pressure signal in the photoacoustic cell is detected through the microphone 9, and the weak sound pressure electric signal is amplified through the corresponding preamplifier 10. The sound pressure signal is transmitted to the lock-in amplifier 11, demodulated by the lock-in amplifier 11, converted into a photoacoustic signal related to the gas concentration, and transmitted to the upper computer 13, and the upper computer 13 is combined with relevant software to process to obtain the gas concentration of each component of the detected gas.
As shown in fig. 2, the EDFA (erbium-doped fiber amplifier) 2 includes an isolator 21, a combiner 22, a detector 23, and an erbium-doped fiber 24, the combiner 22 and the isolator 21 are symmetrically and sequentially disposed on two sides of the erbium-doped fiber 24, and the two detectors 23 are respectively connected to the combiner 22.
The isolator 21 ensures unidirectional transmission of optical signals, the combiner 22 couples input weak optical signals to be amplified and light waves output by the light source into the same optical fiber, the detector 23 is used for detecting the position and intensity of an optical signal spectral line, and the erbium-doped optical fiber 24 is used for amplifying the optical signals.
The EDFA (erbium doped fiber amplifier) 2 of the present invention couples an input signal and light into an erbium doped fiber, transfers the energy of the light into the input signal through the erbium doped fiber, and realizes the amplification of the input signal. Therefore, the laser power is enhanced, the final photoacoustic signal is greatly improved, and the detection limit of the gas is improved.
The multifunctional mixed gas photoacoustic detection method of the present invention will be described with reference to various embodiments.
Example 1:
when monitoring a certain decomposed component gas of the power equipment, as shown in fig. 3, the corresponding steps are to open the gas inlets 7 of the first photoacoustic cell 3, the second photoacoustic cell 4, and the third photoacoustic cell 5. Decomposed component gas of the access device enters the three photoacoustic cells from the gas inlet through the gas pipe, the signal generator 12 is turned on, a certain frequency is modulated and a rectangular wave voltage signal is emitted, infrared laser with a certain wavelength is generated by combining the temperature control of the QCL laser 1, and the wavelength of the laser corresponds to the type of the detected gas. The EDFA (erbium doped fiber amplifier) 2 amplifies an input optical signal. The gas to be measured in the three photoacoustic cells and the infrared laser processed by the EDFA (erbium doped fiber amplifier) 2 generate photoacoustic action to cause the air pressure in the three closed photoacoustic cells to change.
Microphones 9 in the three photoacoustic cells detect sound pressure signals in the photoacoustic cells, and the corresponding preamplifiers 10 amplify weak sound pressure electric signals. The sound pressure signal is transmitted to the lock-in amplifier 11 and demodulated by the lock-in amplifier 11, so as to be converted into a photoacoustic signal related to the gas concentration, and the upper computer 13 combines with the coherent software to process, so as to obtain the concentration information related to the gas to be measured.
In this embodiment, the laser emitted from the laser passes through three photoacoustic cells, and each photoacoustic cell has a certain power loss, so the SOF2The photoacoustic signals obtained by gas detection are different in size, but the finally obtained gas concentration information is consistent through the inversion calculation of a plurality of groups of photoacoustic signals of the upper computer and the gas concentration.
This embodiment has guaranteed the accuracy of testing result through measuring three simultaneously to a gas.
Example 2:
when detecting a plurality of gases, SOF is used as shown in FIG. 32And SO2F2For example, the gas detection method comprises the following steps:
opening air inlets 7 of a first photoacoustic cell 3, a second photoacoustic cell 4 and a third photoacoustic cell 5, introducing detection gas of access equipment into the three photoacoustic cells through air pipes, opening a signal generator 12, modulating the frequency through the signal generator 12, wherein the frequency is SOF (surface acoustic wave) at the moment2The optimum debugging frequency of the laser, the temperature of the laser 1 is controlled and set, laser with a certain wavelength is emitted, and the EDFA (erbium doped fiber amplifier) 2 realizes the amplification of input optical signals. The gas to be detected in the three photoacoustic cells and the infrared laser processed by the EDFA2 generate photoacoustic action to cause the air pressure in the three sealed photoacoustic cells to change, the microphones 9 in the three photoacoustic cells detect the sound pressure signals in the photoacoustic cells, and the corresponding preamplifiers 10 amplify the weak sound pressure electric signals. The sound pressure signal is transmitted to the lock-in amplifier 11, demodulated by the lock-in amplifier 11 and converted into a photoacoustic signal related to the gas concentration, and the upper computer 13 performs SOF (self-organizing function) by combining with coherent software processing2And detecting the gas to obtain a photoacoustic signal of the SOF2 gas.
The frequency is modulated by the signal generator 12, the modulation frequency is changed, in this case the frequency is SO2F2The optimum debugging frequency of the laser is controlled by the temperature of the laser 1, the laser with corresponding wavelength is emitted, and the SO is obtained through the steps2F2Photoacoustic signal of gas.
And the ratio of different components in the mixed gas is obtained by analyzing the photoacoustic signals of different gases.
Example 3:
when detecting the decomposed component (SOF2 gas) at different positions of the power equipment, as shown in fig. 4, it is only necessary to connect the inlet 7 of the first photoacoustic cell 3 to the power equipment a, connect the inlet 7 of the second photoacoustic cell 4 to the power equipment B, and connect the inlet 7 of the third photoacoustic cell 5 to the power equipment C. Wherein A, B and C are positions of the power equipment with potential discharge hazards.
The laser 1 is turned on to emit laser, and the EDFA (erbium doped fiber amplifier) 2 amplifies the input optical signal. The processed infrared laser and the gas to be measured in each photoacoustic cell generate photoacoustic action to obtain three groups of photoacoustic signal values, and the three groups of photoacoustic signal values are SOF (self-induced fluorescence) at different positions2Gas concentration value, thereby performing simultaneous detection of different positions of SF6 decomposition components.
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 above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A multifunctional mixed gas photoacoustic detection apparatus, the apparatus comprising: the device comprises a quantum cascade laser (1), an erbium-doped fiber amplifier (2), a first photoacoustic cell (3), a second photoacoustic cell (4), a third photoacoustic cell (5), a lock-in amplifier (11), a signal generator (12) and an upper computer (13); the quantum cascade laser generates infrared laser according to a signal generator, and the laser generates photoacoustic action with gas to be detected in the photoacoustic cell after being amplified by the erbium-doped fiber amplifier, so that the concentration of the corresponding gas in the input gas to be detected is detected.
2. The device according to claim 1, wherein the signal generator (12) modulates the frequency and generates a rectangular wave voltage signal according to the gas to be detected, and the quantum cascade laser (1) sets the temperature through temperature control according to the corresponding signal to generate infrared laser light with a certain wavelength, and the laser wavelength corresponds to the type of the gas to be detected.
3. An arrangement according to claim 2, characterized in that each of the photo-acoustic cells comprises a gas inlet (7), a gas outlet (8), a microphone (9) and a preamplifier (10).
4. A device according to claim 3, characterized in that the detection gas is led into the photoacoustic cell through a gas inlet (7), the gas to be measured in the photoacoustic cell is photoacoustic-acted with the infrared laser light causing a change in the gas pressure in the photoacoustic cell, the acoustic pressure signal in the photoacoustic cell is detected by a microphone (9), and the acoustic pressure electrical signal is amplified by a corresponding preamplifier (10).
5. The device according to claim 4, characterized in that the sound pressure signal is transmitted to a lock-in amplifier (11), demodulated by the lock-in amplifier (11), converted into a photoacoustic signal related to the gas concentration, and transmitted to an upper computer (13), and the upper computer processes the photoacoustic signal to obtain the gas concentration of each component of the detected gas.
6. The device according to claim 1, wherein the erbium-doped fiber amplifier (2) comprises an isolator (21), a wave combiner (22), a detector (23) and an erbium-doped fiber (24), the wave combiner (22) and the isolator (21) are sequentially arranged on the erbium-doped fiber (24) in a bilateral symmetry manner, and the two detectors (23) are respectively connected with the wave combiner (22) and used for enhancing the laser power generated by the laser.
7. The device according to claim 6, wherein the isolator (21) is used for ensuring unidirectional transmission of the optical signal, the combiner (22) couples the input weak optical signal to be amplified and the optical wave output by the light source into the same optical fiber, the detector (23) detects the position and intensity of the optical signal line, and the erbium-doped optical fiber (24) is used for amplifying the optical signal.
8. A multifunctional mixed gas photoacoustic detection method, characterized in that the detection device of claim 7 is used for detection of decomposed component gases of electric power equipment, and the method comprises the following steps:
s1: opening air inlets of the first photoacoustic cell, the second photoacoustic cell and the third photoacoustic cell; decomposed component gas of the access equipment enters the three photoacoustic cells from the gas inlet through the gas pipe;
s2: turning on a signal generator, modulating a certain frequency and emitting a rectangular wave voltage signal, and generating infrared laser with a certain wavelength by combining the temperature control of a QCL laser, wherein the wavelength of the laser corresponds to the type of the detected gas; the erbium-doped fiber amplifier realizes the amplification of an input optical signal;
s3: gas to be measured in the three photoacoustic cells and infrared laser generate photoacoustic action to cause the air pressure in the three closed photoacoustic cells to change;
s4: microphones in the three photoacoustic cells detect sound pressure signals in the photoacoustic cells, and the sound pressure signals are amplified by corresponding preamplifiers;
s5: the sound pressure signal is transmitted to a phase-locked amplifier, demodulated by the phase-locked amplifier and converted into a photoacoustic signal related to the gas concentration;
s6: the upper computer obtains the concentration information of the gas to be measured.
9. A multifunctional mixed gas photoacoustic detection method, characterized in that the detection device of claim 7 is used for detecting the mixed gas components of electric equipment, and the method comprises the following steps:
s1: opening air inlets of the first photoacoustic cell, the second photoacoustic cell and the third photoacoustic cell; decomposed component gas of the access equipment enters the three photoacoustic cells from the gas inlet through the gas pipe;
s2: turning on a signal generator, modulating a first frequency and emitting a rectangular wave voltage signal, wherein the first frequency corresponds to a first gas component, and generating infrared laser with a certain wavelength by combining the temperature control of a QCL laser; the erbium-doped fiber amplifier realizes the amplification of an input optical signal;
s3: gas to be measured in the three photoacoustic cells and infrared laser generate photoacoustic action to cause the air pressure in the three closed photoacoustic cells to change; microphones in the three photoacoustic cells detect sound pressure signals in the photoacoustic cells, and the sound pressure signals are amplified by corresponding preamplifiers;
s4: the sound pressure signal is transmitted to a phase-locked amplifier, demodulated by the phase-locked amplifier and converted into a photoacoustic signal related to the gas concentration;
s6: turning on a signal generator, modulating a second frequency and emitting a rectangular wave voltage signal, wherein the second frequency corresponds to a second gas component, and generating infrared laser with a certain wavelength by combining the temperature control of the QCL laser; the erbium-doped fiber amplifier realizes the amplification of an input optical signal;
s7: repeating steps S3-S4;
s8: and the upper computer analyzes the photoacoustic signals of different gases to obtain the ratio of different components in the mixed gas.
10. A multifunctional mixed gas photoacoustic detection method, characterized in that the detection device of claim 7 is used for detecting the components of decomposed gas at different positions of electrical equipment, and the method comprises the following steps:
s1: the air inlet of the first photoacoustic cell is connected to a power device A, the air inlet of the second photoacoustic cell is connected to a power device B, the air inlet of the third photoacoustic cell is connected to a power device C, and the A, B and C are positions where the power device has potential discharge hazards; opening air inlets of the first photoacoustic cell, the second photoacoustic cell and the third photoacoustic cell;
s2: turning on a signal generator, modulating a certain frequency and emitting a rectangular wave voltage signal, and generating infrared laser with a certain wavelength by combining the temperature control of the QCL laser; the erbium-doped fiber amplifier realizes the amplification of an input optical signal;
s3: gas to be measured in the three photoacoustic cells and infrared laser generate photoacoustic action to cause the air pressure in the three closed photoacoustic cells to change;
s4: microphones in the three photoacoustic cells detect sound pressure signals in the photoacoustic cells, and the sound pressure signals are amplified by corresponding preamplifiers;
s5: the sound pressure signal is transmitted to a phase-locked amplifier, demodulated by the phase-locked amplifier and converted into a photoacoustic signal related to the gas concentration; thereby obtaining three sets of photoacoustic signal values;
s6: and the upper computer obtains the concentration information of the gas to be measured at different positions according to the three groups of photoacoustic signal values.
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- 2021-12-08 CN CN202111494415.5A patent/CN114166757A/en active Pending
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| JP2017150869A (en) * | 2016-02-23 | 2017-08-31 | 日本電信電話株式会社 | Component concentration measurement device |
| CN108226047A (en) * | 2017-12-29 | 2018-06-29 | 山东大学 | Optoacoustic spectroscopy multiple spot gas detecting system based on optical fiber laser annular cavity |
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