CN112630165B - Detection device for gas in transformer oil - Google Patents
Detection device for gas in transformer oil Download PDFInfo
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- CN112630165B CN112630165B CN202110017766.0A CN202110017766A CN112630165B CN 112630165 B CN112630165 B CN 112630165B CN 202110017766 A CN202110017766 A CN 202110017766A CN 112630165 B CN112630165 B CN 112630165B
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- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 239000011521 glass Substances 0.000 claims abstract description 116
- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 54
- 238000010895 photoacoustic effect Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 239000002041 carbon nanotube Substances 0.000 description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000004817 gas chromatography Methods 0.000 description 2
- 238000004949 mass spectrometry Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000001834 photoacoustic spectrum Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—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
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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Abstract
The application provides a device for detecting gas in transformer oil, which comprises the following components: the device comprises a differential Helmholtz resonator, a laser source unit and a photoacoustic signal detection unit; the laser source unit comprises two tunable lasers and two pieces of Kong Mao glass; the ribbon Kong Mao glass is located between the tunable laser and the differential helmholtz resonator; the photoacoustic signal detection unit comprises two electret microphones, a phase-locked amplifier and an oscilloscope; the acoustic signals detected by the two electret microphones are out of phase, and the acoustic signals are input into a phase-locked amplifier for differential operational amplification and then are input into an oscilloscope for display. According to the device for detecting the gas in the transformer oil, disclosed by the application, the two tunable lasers are utilized, the gas with the absorption effect in different wave bands can be detected under the condition that the lasers are not required to be replaced, each laser correspondingly generates one photoacoustic signal, the two photoacoustic signals are differentiated, the noise enhancement signals can be eliminated, and the high sensitivity and excellent cross interference resistance of detection are realized.
Description
Technical Field
The application relates to the technical field of electric field, in particular to a device for detecting gas in transformer oil.
Background
For detecting the dissolved gas in the transformer oil, the existing fault characteristic gas on-line monitoring device mainly comprises two parts of a fault characteristic gas sensing detector separated from the oil-gas separator and the oil. Analysis showed that: the problems of gas cross interference, easy aging, poor stability and the like existing in the internal sensor detector are main reasons for large analysis error, multiple misjudgment and missed judgment of the existing fault characteristic gas on-line monitoring device. The existing fault characteristic gas sensing analysis method mainly comprises the following steps: gas chromatography, mass spectrometry, semiconductor (carbon nanotube) gas sensors, solid state microbridge detectors. Gas chromatography is the most commonly used detection method for micro-fault characteristic gas analysis, and accurate measurement can be realized. However, the chromatographic column is easy to age, and is unfavorable for long-term detection. The mass spectrometry has the characteristics of high efficiency and accurate detection, but can realize the effective detection of the mixed gas only by combining a chromatographic column; the semiconductor (carbon nano tube) gas sensor and the solid-state microbridge detector have high sensitivity, but have the problems of mixed gas cross sensitivity, easy aging and low stability, and the detection accuracy of the semiconductor (carbon nano tube) gas sensor and the solid-state microbridge detector also needs to be improved.
Disclosure of Invention
In order to solve the technical problems of gas cross interference, easy aging, poor stability and the like of the existing dissolved gas detection device in transformer oil, the device for detecting the dissolved gas in the transformer oil based on differential Helmholtz resonance enhanced photoacoustic spectroscopy is provided, two tunable lasers are used for realizing gas absorption effect detection in different wave band ranges, the detection requirements of various gases are met, and the wavelengths of the two lasers can be independently adjusted. By using the device, nondestructive high-sensitivity detection of dissolved gas in transformer oil can be realized, the problem of cross interference among different gases is solved, and the detection stability is improved.
The application relates to a device for detecting gas in transformer oil, which comprises the following components: the device comprises a differential Helmholtz resonator, a laser source unit and a photoacoustic signal detection unit;
The laser source unit comprises a first tunable laser, a second tunable laser, first band Kong Mao glass and second band Kong Mao glass;
The band number Kong Mao glass is located between the tunable laser number one and the differential helmholtz resonator; the band number two Kong Mao glass is located between the number two tunable laser and the differential helmholtz resonator;
the photoacoustic signal detection unit comprises two electret microphones, a phase-locked amplifier and an oscilloscope;
The two electret microphones are connected with the lock-in amplifier and the oscilloscope; and the acoustic signals detected by the two electret microphones are out of phase, and the acoustic signals are input into the lock-in amplifier for differential operational amplification and then are input into the oscilloscope for display.
Optionally, the first tunable laser and the second tunable laser have different wave bands, and different types of gases with photoacoustic effects in different wave bands can be detected;
The first tunable laser and the second tunable laser are both pulsed, and the modulation frequency is set to match the resonance frequency of the differential Helmholtz resonator.
Optionally, the differential helmholtz resonator comprises two identical cylindrical compartments made of glass, two identical capillary glass tubes, two identical sleeve vents, two identical three-way valves, four identical glass window mirrors and two identical mirrors;
the differential Helmholtz resonator is a symmetrical mechanism; the two compartments are placed in parallel, the glass window mirrors are arranged at two ends of the compartments, and the glass window mirrors are arranged at two ends of the compartments; the glass window mirror can allow laser to pass through, and is obliquely arranged so as to avoid direct reflection to the laser;
the two compartments are connected by two capillary glass tubes;
The three-way valve is arranged in the middle of the capillary glass tube; the three-way valve is arranged in the middle of the capillary glass tube; the sleeve-type air vent is connected with the three-way valve, and the sleeve-type air vent is connected with the three-way valve;
the first tunable laser and the first ribbon Kong Mao glass are placed on the side of the compartment where the glass window mirror is located;
The reflecting mirror is obliquely arranged on one side of the compartment where the glass window mirror is arranged;
the second tunable laser and the second ribbon Kong Mao glass are placed on the side of the compartment where the glass window mirror is located;
The reflecting mirror is obliquely arranged on one side of the compartment where the glass window mirror is arranged;
Optionally, the two said capillary glass tubes are the same length as the two said compartments; the linear distance between the two compartments is the same as the length of the two capillary glass tubes, and the two capillary glass tubes are perpendicular to the two compartments.
Optionally, the first tunable laser, the first band Kong Mao glass, the compartment, the glass window mirror and the reflecting mirror are sequentially placed, and geometric centers of the components are arranged on the same straight line; laser light emitted from the first tunable laser may propagate forward through the aperture in the center of the first band Kong Mao glass along the geometric center of the compartment, the glass window mirror, and the mirror;
The second tunable laser, the second band Kong Mao glass, the compartment, the glass window mirror and the reflecting mirror are sequentially arranged, and the geometric centers of the components are arranged on the same straight line; laser light emitted from the tunable laser # two may propagate forward through the aperture in the center of the ribbon # two Kong Mao glass along the geometric center of the compartment, the glass window mirror, and the mirror.
Optionally, the two electret microphones are respectively arranged at the middle positions of the two compartments.
According to the technical scheme, the device for detecting the gas in the transformer oil provided by the application comprises the following components: the device comprises a differential Helmholtz resonator, a laser source unit and a photoacoustic signal detection unit; the laser source unit comprises a first tunable laser, a second tunable laser, first band Kong Mao glass and second band Kong Mao glass; the first band Kong Mao glass is located between the first tunable laser and the differential helmholtz resonator; the second band Kong Mao glass is located between the second tunable laser and the differential helmholtz resonator; the photoacoustic signal detection unit comprises two electret microphones, a phase-locked amplifier and an oscilloscope; the two electret microphones are connected with the lock-in amplifier and the oscilloscope; the acoustic signals detected by the two electret microphones are out of phase, and the acoustic signals are input into a phase-locked amplifier for differential operational amplification and then are input into an oscilloscope for display. The device for detecting the gas in the transformer oil can detect the gas with the absorption effect in different wave bands by using the two tunable lasers under the condition that the lasers are not required to be replaced. Can be used for detecting various trace gases such as CO, CO 2,O2,N2 and the like. And each laser correspondingly generates a photoacoustic signal, and the two photoacoustic signals are detected by using two microphones and are differentiated, so that the effects of eliminating noise and enhancing signals are achieved, and trace gas detection with high sensitivity is realized. Because the wavelengths of absorption effects of different gases are different, the device can realize extremely high selectivity and has extremely good cross interference resistance.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a gas detection device in transformer oil according to the present application;
FIG. 2 is a diagram showing the detection result of the gas detection device O 2 in transformer oil according to the present application;
Fig. 3 shows a detection result of a gas detection device CO 2 in transformer oil according to the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the application. Merely exemplary of systems and methods consistent with aspects of the application as set forth in the claims.
The photoacoustic spectrum gas detection technology is based on the absorption effect of gas, the sound pressure generated by the absorption effect between laser and gas to be detected is called photoacoustic effect, and the gas concentration can be represented by the size of the sound pressure.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings; the preferred embodiments are merely for the purpose of illustrating the invention and are not intended to limit the scope of the invention.
Referring to fig. 1, a schematic structure diagram of a device for detecting gas in transformer oil according to the present application is shown; as shown in fig. 1, the device comprises three parts: differential helmholtz resonator, laser source unit, optoacoustic signal detection unit.
The laser source unit includes: a tunable laser 1, a tunable laser 20, a band Kong Mao glass 2, a band Kong Mao glass 19; the tunable laser 1 is a distributed feedback diode laser in the red optical band, in this example tuned to around 760nm for detecting O 2, and the tunable laser 20 is a distributed feedback diode laser in the near infrared band, in this example tuned to around 1.6 μm for detecting CO 2. Both tunable lasers are pulsed with a modulation frequency set to match the resonance frequency of the differential helmholtz resonator.
The differential helmholtz resonator comprises two identical cylindrical compartments 4 and 16 made of glass, both compartments 4 and 16 having a length of 10cm-15cm; the inner diameter of each of the compartments 4 and 16 is 1cm-2cm; the two identical capillary glass tubes 8 and 11 have inner diameters of 0.2cm-0.3cm; two identical sleeve vents 9 and 13, two identical three-way valves 10 and 12, four identical glass window mirrors 3, 6, 15 and 18, two mirrors 7 and 14.
The differential Helmholtz resonators are symmetrically distributed on the whole, the compartments 4 and 16 are arranged in parallel at intervals, and the glass window mirror 3, the glass window mirror 6, the glass window mirror 15 and the glass window mirror 18 are respectively arranged at the tail ends of the compartments 4 and 16 and can allow laser to pass through. Each window mirror is slightly inclined to avoid direct reflection to the laser, and in this embodiment, when the inclination angle between the perpendicular line of the mirror surface and the axis of the compartment is 5, 8, or 10 degrees, direct reflection to the laser can be effectively avoided.
The compartments 4 and 16 are connected by the capillary glass tube 8 and the capillary glass tube 11, and the connection positions of the capillary glass tube 8 and the capillary glass tube 11 and the compartments 4 and 16 are 1cm or 2cm away from the end of the compartments 4 and 16. A three-way valve 10 is arranged in the middle of the capillary glass tube 8, and a three-way valve 12 is arranged in the middle of the capillary glass tube 11; the three-way valve 10 and the three-way valve 12 are respectively connected with the sleeve-type air vent 9 and the sleeve-type air vent 13 as an air inlet and an air outlet.
The mirrors 7 and 14 are placed behind the compartments 4 and 16 at a distance from the compartments 4 and 16. The compartments 4 and 16 are each 10cm in length and 1cm in inner diameter. The lengths of the capillary glass tube 8 and the capillary glass tube 11 were the same as those of the compartments 4 and 16, and the inner diameters were 0.2cm. The linear distance between the parallel arranged compartments 4 and 16 is equal to the lengths of the capillary glass tube 8 and the capillary glass tube 11, and the capillary glass tube 8 and the capillary glass tube 11 are vertically connected with the compartments 4 and 16.
The electret microphone 5 and the electret microphone 17 in the photoacoustic signal detecting unit are respectively arranged in the middle of the compartment 4 and the compartment 16, acoustic signals detected by the electret microphone 5 and the electret microphone 17 are out of phase, and the acoustic signals are input into the lock-in amplifier 21 for differential operational amplification and then are input into the oscilloscope 22 for display.
In the laser source unit and the differential Helmholtz resonator, each part is sequentially arranged according to a first tunable laser 1, a first band Kong Mao glass 2, a glass window mirror 3, a compartment 4, a glass window mirror 6 and a reflecting mirror 7, and the geometric centers of each part are arranged on the same straight line; the laser light emitted from the first tunable laser 1 can propagate forward through the small hole in the center of the first band Kong Mao glass 2 along the geometric center of the glass window mirror 3, the compartment 4, the glass window mirror 6, and the mirror 7; the reflecting mirror 7 is obliquely placed at an angle to the glass window mirror 6, and the angle can be set to 2 degrees, 3 degrees or 5 degrees.
The second tunable laser 20, the second band Kong Mao glass 19, the glass window mirror 18, the compartment 16, the glass window mirror 15 and the reflecting mirror 14 are sequentially arranged, and the geometric centers of the components are arranged on the same straight line; laser light emitted from tunable laser number two 20 may propagate forward through the aperture in the center of band number two Kong Mao glass 19 along the geometric center of glass window mirror 18, compartment 16, glass window mirror 15, and mirror 14; the mirror 14 is placed obliquely at an angle to the glass window mirror 15, and the angle may be set to 2 degrees, 3 degrees or 5 degrees.
After being reflected by the reflecting mirror 7 and the reflecting mirror 14, the laser light passes through the compartments 4 and 16 again, so that the length of the photoacoustic effect acting path is doubled, and the backward reflecting light path and the forward propagation light path form a slight angle due to the inclination of the reflecting mirror 7 and the reflecting mirror 14, and can be blocked by the first band Kong Mao glass 2 and the second band Kong Mao glass 19 and cannot be reflected back to the first tunable laser 1 and the second tunable laser 20.
The differential Helmholtz resonant cavity in the scheme is composed of two parts, and the two parts are symmetrically arranged. The two cylindrical compartments 4 and 16 made of the same glass of the differential helmholtz resonator pass through lasers of different wave bands, corresponding to the gases of the photoacoustic effect in different wave bands; the compartments 4 and 16 are connected by two capillary glass tubes 8 and 11. When the photoacoustic effect occurs, the acoustic pressure will circulate between the compartments 4 and 16 through the capillary glass tube 8 and the capillary glass tube 11; if the laser is pulsed, two periodic sound pressure waves are generated in the compartments 4 and 16, respectively, which have the same frequency and amplitude, but opposite phases. If the frequency of the laser pulse is modulated to be the same as the resonance frequency of the differential helmholtz resonator, a standing wave of maximum amplitude (resonant photoacoustic signal) is generated, enhancing the photoacoustic signal. An electret microphone 5 and an electret microphone 17 are respectively arranged in the middle of the compartment 4 and the compartment 16 and used as acoustic sensors, and signals detected by the electret microphone 5 and the electret microphone 17 enter a lock-in amplifier to carry out differential operation and then are introduced into an oscilloscope.
The differential Helmholtz resonant cavity enhanced photoacoustic spectroscopy is characterized in that: the symmetrical resonator consisting of two identical compartments 4 and 16 produces photoacoustic absorption signals that are out of phase, while the noise, including flow noise, in both compartments 4 and 16 is in phase. Therefore, by means of differential detection, the signal can be doubled, and noise is eliminated to a great extent, so that high-sensitivity detection of the gas to be detected is realized.
Referring to fig. 2, a diagram of a detection result of a gas detection device O 2 in transformer oil according to the present application is shown;
In the detection, the second tunable laser 20 was turned off, the first tunable laser 1 was modulated so that the wavelength was 764.3nm, the pulse frequency was 260Hz, the square wave duty cycle was 50%, 50000ppm of O 2 (1 bar of N 2 as bottom gas) was introduced through the sleeve vent 9, and the obtained detection chart was shown in fig. 2, and the noise equivalent detection limit was 600ppm by analysis.
Referring to fig. 3, a detection result of a gas detection device CO 2 in transformer oil according to the present application;
the first tunable laser 1 was turned off, the second tunable laser 20 was modulated so that the wavelength was 1.573 μm, the pulse frequency was 220Hz, the square wave duty cycle was 50%, 1000ppm of CO 2 (1 bar of bottom gas N 2) was introduced through the sleeve vent 13, and the resulting detection chart was shown in fig. 3, and the noise equivalent detection limit was 160ppm by analysis.
According to the technical scheme, the device for detecting the gas in the transformer oil provided by the application comprises the following components: the device comprises a differential Helmholtz resonator, a laser source unit and a photoacoustic signal detection unit; the laser source unit comprises a first tunable laser 1, a second tunable laser 20, a first band Kong Mao glass 2 and a second band Kong Mao glass 19; a first band Kong Mao of glass 2 is located between the first tunable laser 1 and the differential helmholtz resonator; the band number two Kong Mao glass 19 is located between the tunable laser number two 20 and the differential helmholtz resonator; the photoacoustic signal detection unit comprises an electret microphone 5, an electret microphone 7, a lock-in amplifier 21 and an oscilloscope 22; the electret microphone 5 and the electret microphone 7 are connected with the lock-in amplifier 21 and the oscilloscope 22; the acoustic signals detected by the electret microphone 5 and the electret microphone 7 are out of phase, and the acoustic signals are input into the lock-in amplifier 21 for differential operational amplification and then are input into the oscilloscope 22 for display. The device for detecting the gas in the transformer oil can detect the gas with the absorption effect in different wave bands by using the two tunable lasers under the condition that the lasers are not required to be replaced. Can be used for detecting various trace gases such as CO, CO 2,O2,N2 and the like. And each laser correspondingly generates a photoacoustic signal, and the two photoacoustic signals are detected by using two electret microphones and are differentiated, so that the effects of eliminating noise and enhancing signals are achieved, and trace gas detection with high sensitivity is realized. Because the wavelengths of absorption effects of different gases are different, the device can realize extremely high selectivity and has extremely good cross interference resistance.
The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present application. Any other embodiments which are extended according to the solution of the application without inventive effort fall within the scope of protection of the application for a person skilled in the art.
Claims (4)
1. The device for detecting the gas in the transformer oil is characterized by comprising a differential Helmholtz resonator, a laser source unit and a photoacoustic signal detection unit;
The laser source unit comprises a first tunable laser (1), a second tunable laser (20), first band Kong Mao glass (2) and second band Kong Mao glass (19);
The first band Kong Mao glass (2) is located between the first tunable laser (1) and the differential helmholtz resonator; the band number two Kong Mao glass (19) is located between the tunable laser number two (20) and the differential helmholtz resonator;
the photoacoustic signal detection unit comprises two electret microphones (5, 17), a phase-locked amplifier (21) and an oscilloscope (22);
the two electret microphones (5, 17) are connected with the lock-in amplifier (21) and the oscilloscope (22); the acoustic signals detected by the two electret microphones (5, 17) are out of phase, and the acoustic signals are input into the lock-in amplifier (21) for differential operational amplification and then are input into the oscilloscope (22) for display;
The differential helmholtz resonator comprises two identical cylindrical compartments (4, 16) made of glass, two identical capillary glass tubes (8, 11), two identical sleeve vents (9, 13), two identical three-way valves (10, 12), four identical glass window mirrors (3, 6, 15, 18) and two identical mirrors (7, 14);
The differential Helmholtz resonator is a symmetrical mechanism; the two compartments (4, 16) are placed in parallel, the glass window mirrors (3, 6) are arranged at two ends of the compartment (4), and the glass window mirrors (15, 18) are arranged at two ends of the compartment (16); the glass window mirrors (3, 6, 15, 18) can allow laser light to pass through, and the glass window mirrors (3, 6, 15, 18) are obliquely arranged so as to avoid direct reflection to the laser;
the two compartments (4, 16) are connected by two capillary glass tubes (8, 11);
the three-way valve (10) is arranged in the middle of the capillary glass tube (8); the three-way valve (12) is arranged in the middle of the capillary glass tube (11); the sleeve type air vent (9) is connected with the three-way valve (10), and the sleeve type air vent (13) is connected with the three-way valve (12);
The first tunable laser (1) and the first band Kong Mao of glass (2) are placed on one side of the compartment (4) where the glass window mirror (3) is arranged;
The reflecting mirror (7) is obliquely arranged on one side of the compartment (4) where the glass window mirror (6) is arranged;
the second tunable laser (20) and the second band Kong Mao glass (19) are placed on the side of the compartment (16) where the glass window mirror (18) is located;
The reflecting mirror (14) is obliquely placed on the side of the compartment (16) where the glass window mirror (15) is arranged;
the first tunable laser (1), the first band Kong Mao glass (2), the glass window mirror (3), the compartment (4), the glass window mirror (6) and the reflecting mirror (7) are sequentially arranged, and the geometric centers of the components are arranged on the same straight line; laser light emitted from the first tunable laser (1) can propagate forward through the small hole in the center of the first band Kong Mao glass (2) along the geometric center of the glass window mirror (3), the compartment (4), the glass window mirror (6) and the mirror (7);
The second tunable laser (20), the second band Kong Mao glass (19), the glass window mirror (18), the compartment (16), the glass window mirror (15) and the reflecting mirror (14) are sequentially arranged, and the geometric centers of the components are arranged on the same straight line; laser light emitted from the tunable laser (20) may propagate forward through an aperture in the center of the band Kong Mao glass (19) along the geometric center of the glass window mirror (18), the compartment (16), the glass window mirror (15), and the mirror (14).
2. The device for detecting the gas in the transformer oil according to claim 1, wherein the first tunable laser (1) and the second tunable laser (20) have different wave bands, and can detect different kinds of gas with the photoacoustic effect in different wave bands;
The first tunable laser (1) and the second tunable laser (20) are both pulse-modulated, and the modulation frequency is set to be matched with the resonance frequency of the differential Helmholtz resonator.
3. A device for detecting gases in transformer oil according to claim 1, characterized in that the two capillary glass tubes (8, 11) are of the same length as the two compartments (4, 16); the linear distance between the two compartments (4, 16) is the same as the length of the two capillary glass tubes (8, 11); the two capillary glass tubes (8, 11) are perpendicular to the two compartments (4, 16).
4. A device for detecting gases in transformer oil according to claim 1, characterized in that the electret microphone (5) is arranged in an intermediate position of the compartment (4); the electret microphone (17) is arranged in a middle position of the compartment (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110017766.0A CN112630165B (en) | 2021-01-07 | 2021-01-07 | Detection device for gas in transformer oil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110017766.0A CN112630165B (en) | 2021-01-07 | 2021-01-07 | Detection device for gas in transformer oil |
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| CN112630165A CN112630165A (en) | 2021-04-09 |
| CN112630165B true CN112630165B (en) | 2024-07-23 |
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| CN114088632B (en) * | 2021-11-18 | 2024-10-15 | 国网安徽省电力有限公司电力科学研究院 | Hydrogen sulfide gas detection method and device based on optical fiber photoacoustic sensing |
| JP7541127B2 (en) | 2022-04-28 | 2024-08-27 | エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッド | Gas Sensors |
| CN115201116B (en) * | 2022-09-15 | 2023-01-06 | 中国科学院合肥物质科学研究院 | Low-noise differential Helmholtz photoacoustic spectrum detection device and method |
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| DE4446723C2 (en) * | 1994-06-29 | 1997-03-13 | Hermann Prof Dr Harde | Device and method for measuring the concentration of a gas |
| FR2815122B1 (en) * | 2000-10-06 | 2003-02-07 | Univ Reims Champagne Ardenne | GAS DETECTION DEVICE |
| FR2963102B1 (en) * | 2010-07-21 | 2017-01-13 | Univ Reims Champagne Ardenne | METHOD AND DEVICE FOR DETECTING MULTIPLE GAS TRACES |
| FR2974413B1 (en) * | 2011-04-21 | 2014-06-13 | Commissariat Energie Atomique | PHOTOACOUSTIC GAS DETECTOR WITH HELMHOLTZ CELL |
| FR3017950B1 (en) * | 2014-02-27 | 2017-09-01 | Aerovia | VERY STRONG SENSITIVITY GAS ANALYSIS DEVICE |
| CN104821745A (en) * | 2015-05-29 | 2015-08-05 | 重庆大学 | Low-frequency piezoelectric vibration energy collector based on Helmholtz effect and manufacture process thereof |
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| CN105259116A (en) * | 2015-10-13 | 2016-01-20 | 安徽皖仪科技股份有限公司 | Trace gas measurement device and method with adoption of photo-acoustic spectroscopy |
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| CN106842074B (en) * | 2017-03-03 | 2019-07-02 | 中国人民解放军国防科学技术大学 | Three axial vector atom magnetometers and application method based on longitudinal magnetic field modulation |
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| CN110736703A (en) * | 2018-07-19 | 2020-01-31 | 南京诺威尔光电系统有限公司 | High-sensitivity photoacoustic spectrum detection device and method |
| CN112098335A (en) * | 2020-08-17 | 2020-12-18 | 电子科技大学 | Tunable resonance type photoacoustic cell |
| CN112147076B (en) * | 2020-08-21 | 2022-08-23 | 西安电子科技大学 | Absorption optical path enhanced double-resonance photoacoustic spectrum trace gas detection system |
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