CN114062272A - Gas monitoring method and device in gas insulation equipment based on optical fiber photoacoustic sensing - Google Patents
Gas monitoring method and device in gas insulation equipment based on optical fiber photoacoustic sensing Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 238000009413 insulation Methods 0.000 title claims abstract description 13
- 230000005236 sound signal Effects 0.000 claims abstract description 92
- 230000003287 optical effect Effects 0.000 claims abstract description 63
- 238000005259 measurement Methods 0.000 claims description 22
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 16
- 238000001228 spectrum Methods 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 10
- 238000012806 monitoring device Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 description 9
- 238000001514 detection method Methods 0.000 description 6
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 229910018503 SF6 Inorganic materials 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004847 absorption spectroscopy Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010895 photoacoustic effect Methods 0.000 description 1
- 230000005610 quantum mechanics Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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
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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
- 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
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Abstract
The invention discloses a method and a device for monitoring gas in gas insulation equipment based on optical fiber photoacoustic sensing, wherein the method comprises the following steps: converging and collimating divergent light of an ultraviolet light source, and then making the divergent light enter a light ray array, wherein the optical fiber array is connected with a plurality of groups of photoacoustic sensors, an optical switch is arranged between each group of photoacoustic sensors and the optical fiber array, and each group of photoacoustic sensors are arranged at different positions of the gas insulation equipment; switching on the photoacoustic sensor of the corresponding channel through the switching optical switch to measure the sound signal of the corresponding channel; collecting sound signals of different channels and sending the sound signals to a computer, wherein a LabVIEW program is arranged in the computer, and the sound signals of the different channels are measured to obtain sound signal amplitudes corresponding to the different channels so as to invert the gas concentration; the invention has the advantages that: and gas distributed monitoring is realized.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a method and a device for monitoring gas in gas insulation equipment based on optical fiber photoacoustic sensing.
Background
In gas analysis of fault signatures in electrically insulated equipment, gas chromatography and photoacoustic spectroscopy techniques are commonly employed. Among them, the photoacoustic spectroscopy is gradually replacing gas chromatography because of its high sensitivity and maintenance-free characteristics. However, the strong electromagnetic environment near the high voltage electrical insulation equipment makes the conventional photoacoustic spectroscopy apparatus susceptible to interference, affecting the stability and reliability of the measurement of the concentration of dissolved gas in the transformer oil.
The optical fiber photoacoustic sensing is a new trace gas detection technology, the basic principle of which is that an optical fiber acoustic wave sensing device is used for detecting photoacoustic pressure wave signals generated by gas absorption, and the optical fiber photoacoustic sensing device has the advantages of electromagnetic interference resistance, remote measurement and the like. The document Yin X, Lei D, Wu H, et al, high hly sensing SO2 photo-acoustic sensor for SF6 de-composition detection using a complex mW-level diode-pumped solid-state laser emitting at 303nm [ J ] optical Express,2017,25(26):32581. A compact ppb-level photo-acoustic sulfur dioxide sensor is reported, a small ultraviolet band diode-pumped solid-state laser with the emission wavelength of 303.6nm and the output power of 5mW is developed based on the selection of the spectrum, and a fully symmetrical differential photo-acoustic cell is designed to solve the flow noise problem of sulfur hexafluoride gas and is used for long-time field test in the future. However, gas pollution, gas cross interference among gas chambers and electromagnetic interference on received signals are easy to occur in the air extraction process, so that the problem of distributed monitoring is difficult to realize.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, gas pollution is easy to occur in the air exhaust process, gas cross interference among air chambers is easy to occur, and received signals are easy to be subjected to electromagnetic interference, so that distributed monitoring is difficult to realize.
The invention solves the technical problems through the following technical means: a method for monitoring gas in gas insulated equipment based on optical fiber photoacoustic sensing comprises the following steps:
the method comprises the following steps: converging and collimating divergent light of an ultraviolet light source, and then making the divergent light enter a light ray array, wherein the optical fiber array is connected with a plurality of groups of photoacoustic sensors, an optical switch is arranged between each group of photoacoustic sensors and the optical fiber array, and each group of photoacoustic sensors are arranged at different positions of the gas insulation equipment;
step two: switching on the photoacoustic sensor of the corresponding channel through the switching optical switch to measure the sound signal of the corresponding channel;
step three: collecting sound signals of different channels and sending the sound signals to a computer, wherein a LabVIEW program is arranged in the computer, and a frequency spectrum measuring tool kit in the LabVIEW program measures the sound signals of the different channels to obtain sound signal amplitudes corresponding to the different channels so as to invert the gas concentration of each photoacoustic sensor.
Compared with the middle-infrared band, the ultraviolet light source is adopted, the system cost can be effectively reduced, the light beam transmission loss of the ultraviolet band is low, the distributed measurement of a long distance is more suitable, a plurality of groups of photoacoustic sensors are connected through the optical fiber array, each group of photoacoustic sensors respectively carry out gas detection, sound signals of different channels are collected through the switching optical switch, the frequency spectrum measurement tool pack in the LabVIEW program measures the sound signals of the different channels to obtain the sound signal amplitude values corresponding to the different channels, so that the gas concentration of the position where each photoacoustic sensor is located is inverted, and the distributed measurement is realized.
Further, the first step comprises: the method comprises the steps of adopting an aluminum-plated ellipsoidal high-reflection mirror to converge divergent light of an ultraviolet light source, enabling the converged light to enter an aspheric double-cemented collimating lens to collimate light beams, and placing an optical fiber array at a light outlet position of the collimating lens.
Furthermore, the optical fiber array is connected with four groups of photoacoustic sensors, a first channel optical switch is arranged between the first group of photoacoustic sensors and the optical fiber array, a second channel optical switch is arranged between the second group of photoacoustic sensors and the optical fiber array, a third channel optical switch is arranged between the third group of photoacoustic sensors and the optical fiber array, and a fourth channel optical switch is arranged between the fourth group of photoacoustic sensors and the optical fiber array.
Further, the second step comprises:
opening a first channel optical switch, and detecting the sound signal of a first channel by a first group of photoacoustic sensors;
opening a second channel optical switch, and detecting the sound signal of a second channel by a second group of photoacoustic sensors;
opening a third channel optical switch, and detecting the sound signal of a third channel by a third group of photoacoustic sensors;
and the fourth channel optical switch is turned on, and the fourth group of photoacoustic sensors detects the sound signal of the fourth channel.
Further, the third step includes:
and the sound signals measured by each group of photoacoustic sensors are respectively sent to different interfaces of a LabVIEW program, each interface calls a spectrum measurement tool package, and the sound signals of different channels are measured to obtain the sound signal amplitudes corresponding to the different channels.
Further, the third step further includes:
and according to the amplitude of the sound signal and the proportional relation between the amplitude of the sound signal and the gas concentration, the gas concentration of each photoacoustic sensor is inverted.
Further, the gas is sulfur dioxide.
The invention also provides a gas monitoring device in the gas insulation equipment based on the optical fiber photoacoustic sensing, which comprises:
the optical fiber sensing module is used for converging and collimating divergent light of an ultraviolet light source and then emitting the divergent light into the light array, the optical fiber array is connected with a plurality of groups of photoacoustic sensors, an optical switch is arranged between each group of photoacoustic sensors and the optical fiber array, and each group of photoacoustic sensors are arranged at different positions of the gas insulation equipment;
the acoustic signal measuring module is used for switching on the photoacoustic sensor of the corresponding channel through the switching optical switch to measure the acoustic signal of the corresponding channel;
and the gas concentration inversion module is used for acquiring sound signals of different channels and sending the sound signals to the computer, a LabVIEW program is arranged in the computer, and a spectrum measurement tool packet in the LabVIEW program measures the sound signals of the different channels to obtain sound signal amplitudes corresponding to the different channels so as to invert the gas concentration of each photoacoustic sensor.
Further, the optical fiber sensing module is further configured to: the method comprises the steps of adopting an aluminum-plated ellipsoidal high-reflection mirror to converge divergent light of an ultraviolet light source, enabling the converged light to enter an aspheric double-cemented collimating lens to collimate light beams, and placing an optical fiber array at a light outlet position of the collimating lens.
Furthermore, the optical fiber array is connected with four groups of photoacoustic sensors, a first channel optical switch is arranged between the first group of photoacoustic sensors and the optical fiber array, a second channel optical switch is arranged between the second group of photoacoustic sensors and the optical fiber array, a third channel optical switch is arranged between the third group of photoacoustic sensors and the optical fiber array, and a fourth channel optical switch is arranged between the fourth group of photoacoustic sensors and the optical fiber array.
Still further, the sound signal measurement module is further configured to:
opening a first channel optical switch, and detecting the sound signal of a first channel by a first group of photoacoustic sensors;
opening a second channel optical switch, and detecting the sound signal of a second channel by a second group of photoacoustic sensors;
opening a third channel optical switch, and detecting the sound signal of a third channel by a third group of photoacoustic sensors;
and the fourth channel optical switch is turned on, and the fourth group of photoacoustic sensors detects the sound signal of the fourth channel.
Still further, the gas concentration inversion module is further configured to:
and the sound signals measured by each group of photoacoustic sensors are respectively sent to different interfaces of a LabVIEW program, each interface calls a spectrum measurement tool package, and the sound signals of different channels are measured to obtain the sound signal amplitudes corresponding to the different channels.
Still further, the gas concentration inversion module is further configured to:
and according to the amplitude of the sound signal and the proportional relation between the amplitude of the sound signal and the gas concentration, the gas concentration of each photoacoustic sensor is inverted.
Further, the gas is sulfur dioxide.
The invention has the advantages that: compared with the middle-infrared band, the ultraviolet light source is adopted, the system cost can be effectively reduced, the light beam transmission loss of the ultraviolet band is low, the distributed measurement of a long distance is more suitable, a plurality of groups of photoacoustic sensors are connected through the optical fiber array, each group of photoacoustic sensors respectively carry out gas detection, sound signals of different channels are collected through the switching optical switch, the frequency spectrum measurement tool pack in the LabVIEW program measures the sound signals of the different channels to obtain the sound signal amplitude values corresponding to the different channels, so that the gas concentration of the position where each photoacoustic sensor is located is inverted, and the distributed measurement is realized.
Drawings
Fig. 1 is a flowchart of a method for monitoring gas in a gas insulated apparatus based on fiber optic photoacoustic sensing according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, in the method for monitoring gas in gas insulated equipment based on optical fiber photoacoustic sensing, the gas monitored in this embodiment is sulfur dioxide, and the photoacoustic spectrometry of the sulfur dioxide gas is an indirect absorption spectrometry, and according to the photoacoustic effect of the gas, absorbed light energy is converted into a sound pressure signal by a photoacoustic cell, and then the sound wave signal is detected by a microphone, so as to determine the concentration of the gas. According to quantum mechanics theory, when gas molecules absorb excitation light with specific wavelength and then transition from a ground state to an excited state, the energy of the excited molecules is mainly released in a nonradiative transition mode, and heat is released. It is due to this radiationless relaxation that the substance partially or totally converts the absorbed electromagnetic waves into heat energy, which increases the heat energy and the temperature. If the intensity of the incident light is varied periodically and the modulation rate is smaller than the rate of the radiationless relaxation process, the optical modulation process can generate a corresponding temperature modulation process. Whereas according to the gas law, the temperature modulation process within the enclosed photoacoustic cavity produces periodic pressure changes, i.e., pressure waves, of the same frequency. The process of the present invention is described in detail below.
The gas monitoring method in the gas insulation equipment based on the optical fiber photoacoustic sensing comprises the following steps of:
s1: converging and collimating divergent light of an ultraviolet light source, and then making the divergent light enter a light ray array, wherein the optical fiber array is connected with a plurality of groups of photoacoustic sensors, an optical switch is arranged between each group of photoacoustic sensors and the optical fiber array, and each group of photoacoustic sensors are arranged at different positions of the gas insulation equipment; the specific process is as follows: the method comprises the steps of adopting an aluminum-plated ellipsoidal high-reflection mirror to converge divergent light of an ultraviolet light source, enabling the converged light to enter an aspheric double-cemented collimating lens to collimate light beams, placing an optical fiber array at a light outlet part of the collimating lens, coupling ultraviolet light emitted by the light source into the optical fiber array as efficiently as possible, and enabling the ultraviolet light to enter different photoacoustic sensors at the same time.
In this embodiment, the optical fiber array is connected to four sets of photoacoustic sensors, a first channel optical switch is disposed between the first set of photoacoustic sensors and the optical fiber array, a second channel optical switch is disposed between the second set of photoacoustic sensors and the optical fiber array, a third channel optical switch is disposed between the third set of photoacoustic sensors and the optical fiber array, and a fourth channel optical switch is disposed between the fourth set of photoacoustic sensors and the optical fiber array.
S2: switching on the photoacoustic sensor of the corresponding channel through the switching optical switch to measure the sound signal of the corresponding channel; the specific process is as follows:
opening a first channel optical switch, and detecting the sound signal of a first channel by a first group of photoacoustic sensors;
opening a second channel optical switch, and detecting the sound signal of a second channel by a second group of photoacoustic sensors;
opening a third channel optical switch, and detecting the sound signal of a third channel by a third group of photoacoustic sensors;
and the fourth channel optical switch is turned on, and the fourth group of photoacoustic sensors detects the sound signal of the fourth channel.
S3: collecting sound signals of different channels and sending the sound signals to a computer, wherein a LabVIEW program is arranged in the computer, and a frequency spectrum measuring tool kit in the LabVIEW program measures the sound signals of the different channels to obtain sound signal amplitudes corresponding to the different channels so as to invert the gas concentration of each photoacoustic sensor. The specific process is as follows: and the sound signals measured by each group of photoacoustic sensors are respectively sent to different interfaces of a LabVIEW program, each interface calls a spectrum measurement tool package, and the sound signals of different channels are measured to obtain the sound signal amplitudes corresponding to the different channels. And according to the amplitude of the sound signal and the proportional relation between the amplitude of the sound signal and the gas concentration, the gas concentration of each photoacoustic sensor is inverted. The gas concentration measuring method of the present invention may also adopt other methods, for example, the sound signals detected by each group of photoacoustic sensors are respectively collected through different channels of a spectrometer, then the sound signal amplitude detected by each group of photoacoustic sensors is obtained according to the frequency spectrum corresponding to the sound signals detected by each group of photoacoustic sensors detected by the spectrometer, and the gas concentration is obtained according to the proportional relationship between the sound signal amplitude and the gas concentration.
According to the technical scheme, the ultraviolet light source is adopted to compare with the intermediate infrared band, the system cost can be effectively reduced, the light beam transmission loss of the ultraviolet band is low, the distributed measurement is more suitable for long-distance distributed measurement, the optical fiber array is connected with a plurality of groups of photoacoustic sensors, each group of photoacoustic sensors respectively carry out gas detection, the sound signals of different channels are collected through the switching optical switch, the frequency spectrum measurement toolkit in the LabVIEW program is used for measuring the sound signals of the different channels to obtain the sound signal amplitude values corresponding to the different channels, so that the gas concentration of the position where each photoacoustic sensor is located is inverted, and the distributed measurement is realized.
Example 2
Based on embodiment 1, embodiment 2 of the present invention further provides an apparatus for monitoring gas in a gas insulated device based on optical fiber photoacoustic sensing, where the apparatus includes:
the optical fiber sensing module is used for converging and collimating divergent light of an ultraviolet light source and then emitting the divergent light into the light array, the optical fiber array is connected with a plurality of groups of photoacoustic sensors, an optical switch is arranged between each group of photoacoustic sensors and the optical fiber array, and each group of photoacoustic sensors are arranged at different positions of the gas insulation equipment;
the acoustic signal measuring module is used for switching on the photoacoustic sensor of the corresponding channel through the switching optical switch to measure the acoustic signal of the corresponding channel;
and the gas concentration inversion module is used for acquiring sound signals of different channels and sending the sound signals to the computer, a LabVIEW program is arranged in the computer, and a spectrum measurement tool packet in the LabVIEW program measures the sound signals of the different channels to obtain sound signal amplitudes corresponding to the different channels so as to invert the gas concentration of each photoacoustic sensor.
Specifically, the optical fiber sensing module is further configured to: the method comprises the steps of adopting an aluminum-plated ellipsoidal high-reflection mirror to converge divergent light of an ultraviolet light source, enabling the converged light to enter an aspheric double-cemented collimating lens to collimate light beams, and placing an optical fiber array at a light outlet position of the collimating lens.
Specifically, the optical fiber array is connected with four groups of photoacoustic sensors, a first channel optical switch is arranged between the first group of photoacoustic sensors and the optical fiber array, a second channel optical switch is arranged between the second group of photoacoustic sensors and the optical fiber array, a third channel optical switch is arranged between the third group of photoacoustic sensors and the optical fiber array, and a fourth channel optical switch is arranged between the fourth group of photoacoustic sensors and the optical fiber array.
More specifically, the sound signal measurement module is further configured to:
opening a first channel optical switch, and detecting the sound signal of a first channel by a first group of photoacoustic sensors;
opening a second channel optical switch, and detecting the sound signal of a second channel by a second group of photoacoustic sensors;
opening a third channel optical switch, and detecting the sound signal of a third channel by a third group of photoacoustic sensors;
and the fourth channel optical switch is turned on, and the fourth group of photoacoustic sensors detects the sound signal of the fourth channel.
More specifically, the gas concentration inversion module is further configured to:
and the sound signals measured by each group of photoacoustic sensors are respectively sent to different interfaces of a LabVIEW program, each interface calls a spectrum measurement tool package, and the sound signals of different channels are measured to obtain the sound signal amplitudes corresponding to the different channels.
More specifically, the gas concentration inversion module is further configured to:
and according to the amplitude of the sound signal and the proportional relation between the amplitude of the sound signal and the gas concentration, the gas concentration of each photoacoustic sensor is inverted.
Specifically, the gas is sulfur dioxide.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for monitoring the gas in the gas insulated equipment based on the optical fiber photoacoustic sensing is characterized by comprising the following steps of:
the method comprises the following steps: converging and collimating divergent light of an ultraviolet light source, and then making the divergent light enter a light ray array, wherein the optical fiber array is connected with a plurality of groups of photoacoustic sensors, an optical switch is arranged between each group of photoacoustic sensors and the optical fiber array, and each group of photoacoustic sensors are arranged at different positions of the gas insulation equipment;
step two: switching on the photoacoustic sensor of the corresponding channel through the switching optical switch to measure the sound signal of the corresponding channel;
step three: collecting sound signals of different channels and sending the sound signals to a computer, wherein a LabVIEW program is arranged in the computer, and a frequency spectrum measuring tool kit in the LabVIEW program measures the sound signals of the different channels to obtain sound signal amplitudes corresponding to the different channels so as to invert the gas concentration of each photoacoustic sensor.
2. The method for monitoring gas in gas-insulated equipment based on optical fiber photoacoustic sensing according to claim 1, wherein the first step comprises: the method comprises the steps of adopting an aluminum-plated ellipsoidal high-reflection mirror to converge divergent light of an ultraviolet light source, enabling the converged light to enter an aspheric double-cemented collimating lens to collimate light beams, and placing an optical fiber array at a light outlet position of the collimating lens.
3. The method for monitoring gas in gas insulated equipment based on optical fiber photoacoustic sensing according to claim 1, wherein the optical fiber array is connected to four sets of photoacoustic sensors, a first channel optical switch is arranged between the first set of photoacoustic sensors and the optical fiber array, a second channel optical switch is arranged between the second set of photoacoustic sensors and the optical fiber array, a third channel optical switch is arranged between the third set of photoacoustic sensors and the optical fiber array, and a fourth channel optical switch is arranged between the fourth set of photoacoustic sensors and the optical fiber array.
4. The method for monitoring gas in gas-insulated equipment based on optical fiber photoacoustic sensing according to claim 3, wherein the second step comprises:
opening a first channel optical switch, and detecting the sound signal of a first channel by a first group of photoacoustic sensors;
opening a second channel optical switch, and detecting the sound signal of a second channel by a second group of photoacoustic sensors;
opening a third channel optical switch, and detecting the sound signal of a third channel by a third group of photoacoustic sensors;
and the fourth channel optical switch is turned on, and the fourth group of photoacoustic sensors detects the sound signal of the fourth channel.
5. The method for monitoring gas in gas-insulated equipment based on optical fiber photoacoustic sensing according to claim 4, wherein the third step comprises:
and the sound signals measured by each group of photoacoustic sensors are respectively sent to different interfaces of a LabVIEW program, each interface calls a spectrum measurement tool package, and the sound signals of different channels are measured to obtain the sound signal amplitudes corresponding to the different channels.
6. The method for monitoring gas in gas-insulated equipment based on optical fiber photoacoustic sensing according to claim 5, wherein said step three further comprises:
and according to the amplitude of the sound signal and the proportional relation between the amplitude of the sound signal and the gas concentration, the gas concentration of each photoacoustic sensor is inverted.
7. The method for monitoring gas in a gas insulated apparatus based on fiber optic photoacoustic sensing of claim 1, wherein the gas is sulfur dioxide.
8. Gas monitoring device in gas insulated equipment based on optic fibre optoacoustic sensing, its characterized in that, the device includes:
the optical fiber sensing module is used for converging and collimating divergent light of an ultraviolet light source and then emitting the divergent light into the light array, the optical fiber array is connected with a plurality of groups of photoacoustic sensors, an optical switch is arranged between each group of photoacoustic sensors and the optical fiber array, and each group of photoacoustic sensors are arranged at different positions of the gas insulation equipment;
the acoustic signal measuring module is used for switching on the photoacoustic sensor of the corresponding channel through the switching optical switch to measure the acoustic signal of the corresponding channel;
and the gas concentration inversion module is used for acquiring sound signals of different channels and sending the sound signals to the computer, a LabVIEW program is arranged in the computer, and a spectrum measurement tool packet in the LabVIEW program measures the sound signals of the different channels to obtain sound signal amplitudes corresponding to the different channels so as to invert the gas concentration of each photoacoustic sensor.
9. The gas monitoring device in a gas insulated apparatus based on fiber optic photoacoustic sensing of claim 8, wherein the fiber optic sensing module is further configured to: the method comprises the steps of adopting an aluminum-plated ellipsoidal high-reflection mirror to converge divergent light of an ultraviolet light source, enabling the converged light to enter an aspheric double-cemented collimating lens to collimate light beams, and placing an optical fiber array at a light outlet position of the collimating lens.
10. The gas monitoring device in the gas insulated apparatus based on fiber-optic photoacoustic sensing of claim 8, wherein the fiber array is connected to four sets of photoacoustic sensors, a first channel optical switch is disposed between the first set of photoacoustic sensors and the fiber array, a second channel optical switch is disposed between the second set of photoacoustic sensors and the fiber array, a third channel optical switch is disposed between the third set of photoacoustic sensors and the fiber array, and a fourth channel optical switch is disposed between the fourth set of photoacoustic sensors and the fiber array.
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| CN102539334A (en) * | 2010-12-13 | 2012-07-04 | 西安金和光学科技有限公司 | Standard distributed optical fiber gas sensing device based on photoacoustic spectrum technology |
| CN105510233A (en) * | 2015-12-25 | 2016-04-20 | 哈尔滨工业大学 | Photoacoustic-spectral gas sensor with multi-point measurement capacity and measurement method |
| CN110044824A (en) * | 2019-05-06 | 2019-07-23 | 安徽大学 | A kind of double spectroscopic gas detection devices and method based on quartz tuning-fork |
| CN112461766A (en) * | 2020-12-08 | 2021-03-09 | 国网安徽省电力有限公司电力科学研究院 | Optical fiber photoacoustic sensing probe and sensing system capable of resisting environmental noise interference |
| CN113155742A (en) * | 2021-04-02 | 2021-07-23 | 浙江大学 | Single resonant cavity photoacoustic spectroscopy system and method for simultaneously detecting multiple gases |
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