CN112630165A - Gas detection device in transformer oil - Google Patents
Gas detection device in transformer oil Download PDFInfo
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- CN112630165A CN112630165A CN202110017766.0A CN202110017766A CN112630165A CN 112630165 A CN112630165 A CN 112630165A CN 202110017766 A CN202110017766 A CN 202110017766A CN 112630165 A CN112630165 A CN 112630165A
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- 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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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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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 pair of gas detection device in transformer oil, include: 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 perforated ground glass; the perforated ground glass is positioned 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 sound signals detected by the two electret microphones are out of phase, and the sound signals are input into the phase-locked amplifier for differential operation and amplification and then input into the oscilloscope for display. The utility model provides a gas detection device in transformer oil utilizes two tunable lasers, and is not needing to change under the condition of laser instrument just detectable absorption effect in the gas of different wave bands, every laser instrument corresponds produces a photoacoustic signal, does the difference with two photoacoustic signals, can eliminate noise enhancement signal, realizes the high sensitivity and the fabulous cross interference resistance who detects.
Description
Technical Field
The application relates to the technical field of electricity, especially, relate to a gas detection device in transformer oil.
Background
For detecting dissolved gas in transformer oil, the existing fault characteristic gas online monitoring device mainly comprises an oil-gas separator and a fault characteristic gas sensing detector which is separated from oil. Analysis shows that: the problems of gas cross interference, easy aging, poor stability and the like of the internal sensing detector are main reasons of large analysis error, more misjudgment and missed judgment of the existing fault characteristic gas online 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. The gas chromatography is the most common detection method for trace fault characteristic gas analysis, and can realize accurate measurement. However, the chromatographic column is easy to age and is not favorable for long-term detection. The mass spectrometry has the characteristics of high efficiency and accurate detection, but the effective detection of the mixed gas can be realized only by combining a chromatographic column; the sensitivity of a semiconductor (carbon nano tube) gas sensor and a solid-state microbridge detector is high, but the problems of mixed gas cross sensitivity exist, the mixed gas is easy to age, the stability is low, and the detection accuracy is 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 detection device for the gas dissolved in the transformer oil, the detection device for the gas dissolved in the transformer oil based on the differential Helmholtz resonance enhanced photoacoustic spectroscopy is provided, two tunable lasers are used for realizing the detection of gas absorption effects 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 gas detection device in transformer oil, include: 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, a first perforated ground glass and a second perforated ground glass;
the first perforated ground glass is positioned between the first tunable laser and the differential Helmholtz resonator; the second perforated ground glass is positioned 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 phase-locked amplifier and the oscilloscope; and the sound signals detected by the two electret microphones are out of phase, and the sound signals are input into the phase-locked amplifier for differential operation and amplification and then 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 different wave bands of photoacoustic effects can be detected;
the first tunable laser and the second tunable laser are both pulse modulated, 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 type air ports, two identical three-way valves, four identical glass window mirrors, and two identical mirrors;
the differential Helmholtz resonators are symmetrical mechanisms; the two compartments are placed in parallel, the glass window mirrors are arranged at two ends of each compartment, and the glass window mirrors are arranged at two ends of each compartment; the glass window mirror can allow laser to pass through, and is obliquely arranged 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 port is connected with the three-way valve, and the sleeve type air port is connected with the three-way valve;
the first tunable laser and the first perforated ground glass are placed on one side of the compartment where the glass window mirror is arranged;
the reflector is obliquely arranged on one side of the compartment where the glass window mirror is arranged;
the second tunable laser and the second perforated ground glass are placed on one side of the compartment where the glass window mirror is arranged;
the reflector is obliquely arranged on one side of the compartment where the glass window mirror is arranged;
optionally, the length of the two capillary glass tubes is the same as the length of the two 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 frosted glass with holes, the compartment, the glass window mirror and the reflector are sequentially placed, and geometric centers of the components are arranged on the same straight line; laser light emitted from the tunable laser number one can propagate through a small hole in the center of the ground glass number one along the geometric centers of the compartment, the glass window mirror and the reflector in a forward direction;
the second tunable laser, the second frosted glass with holes, the compartment, the glass window mirror and the reflector are sequentially placed, and the geometric centers of all the parts are arranged on the same straight line; laser light emitted from the tunable laser number two can propagate forward along the geometric centers of the compartment, the glass window mirror, and the mirror through a small hole in the center of the ground glass number two.
Optionally, the two electret microphones are respectively arranged at the middle positions of the two compartments.
According to the technical scheme, the application provides a gas detection device in transformer oil includes: 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, a first perforated ground glass and a second perforated ground glass; the first perforated ground glass is positioned between the first tunable laser and the differential Helmholtz resonator; the second perforated ground glass is positioned 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 phase-locked amplifier and the oscilloscope; the sound signals detected by the two electret microphones are out of phase, and the sound signals are input into the phase-locked amplifier for differential operation and amplification and then input into the oscilloscope for display. The gas detection device in transformer oil utilizes two tunable lasers, and gas of absorption effect at different wave bands can be detected under the condition that the lasers are not required to be replaced. Can be used for detecting CO and CO2，O2，N2And the like. And each laser correspondingly generates a photoacoustic signal, and the two photoacoustic signals are respectively detected by using two microphones and are differentiated, so that the effects of eliminating noise and enhancing signals are achieved, and the high-sensitivity trace gas detection is realized. Because the wavelength of absorption effect of different gases is different, the device can realize extremely high selectivity and has excellent cross interference resistance.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a gas detection device for transformer oil according to the present application;
FIG. 2 is a gaseous detection device O of transformer oil2A detection result graph;
FIG. 3 is a gaseous detection device CO of transformer oil2And (6) detecting the result.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
The photoacoustic spectroscopy gas detection technology is based on the absorption effect of gas, and the sound pressure that the absorption effect can produce takes place between laser and the gas that awaits measuring, and we will call this as photoacoustic effect, through the size of sound pressure, can characterize gas concentration, and this scheme relates to based on difference helmholtz resonant cavity reinforcing photoacoustic spectroscopy technology.
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings; the preferred embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a gas detection device in transformer oil according to the present application is shown; as shown in fig. 1, the present device comprises three parts: the device comprises a differential Helmholtz resonator, a laser source unit and a photoacoustic signal detection unit.
The laser light source unit includes: a first tunable laser 1, a second tunable laser 20, a first perforated ground glass 2 and a second perforated ground glass 19; the first tunable laser 1 is redThe color band distributed feedback diode laser, tuned to around 760nm in this example, is used to detect O2The second tunable laser 20 is a near infrared band distributed feedback diode laser, tuned to about 1.6 μm in this example, for CO detection2. Both tunable lasers are pulsed, the modulation frequency being 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 to 15 cm; the inner diameters of the compartment 4 and the compartment 16 are both 1cm-2 cm; the inner diameters of the capillary glass tube 8 and the capillary glass tube 11 are both 0.2cm-0.3 cm; two identical sleeve vents 9 and 13, two identical three- way valves 10 and 12, four identical glazing mirrors 3, 6, 15 and 18, two mirrors 7 and 14.
The differential Helmholtz resonators are symmetrically distributed on the whole, the compartment 4 and the compartment 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 compartment 4 and the compartment 16 and can allow laser to pass through. Each window mirror is slightly inclined to avoid direct reflection to the laser, and in the embodiment, when the inclination angles of the mirror surface vertical line and the compartment axis are 5, 8 and 10 degrees, direct reflection to the laser can be effectively avoided.
The compartment 4 and the compartment 16 are connected through a capillary glass tube 8 and a capillary glass tube 11, and the connection positions of the capillary glass tube 8 and the capillary glass tube 11 with the compartment 4 and the compartment 16 are 1cm or 2cm away from the ends of the compartment 4 and the compartment 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 connected to the sleeve type vent 9 and the sleeve type vent 13, respectively, as an air inlet and an air outlet.
Mirror 7 and mirror 14 are placed behind compartment 4 and compartment 16 at a distance from compartment 4 and compartment 16. Both compartments 4 and 16 are 10cm in length and 1cm in internal diameter. The capillary glass tube 8 and the capillary glass tube 11 have the same length as the compartments 4 and 16, and each have an internal diameter of 0.2 cm. The linear distance between the compartment 4 and the compartment 16 which are arranged in parallel is equal to the length 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 compartment 4 and the compartment 16.
An electret microphone 5 and an electret microphone 17 in the photoacoustic signal detection unit are respectively installed between 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 are input into a phase-locked amplifier 21 for differential operation and amplification and then input into an oscilloscope 22 for display.
In the laser source unit and the differential Helmholtz resonator, all parts are sequentially arranged according to a tunable laser 1, a perforated ground glass 2, a glass window mirror 3, a compartment 4, a glass window mirror 6 and a reflector 7, and the geometric centers of all parts are arranged on the same straight line; laser emitted from the first tunable laser 1 can be transmitted forwards along the geometric centers of the glass window mirror 3, the compartment 4, the glass window mirror 6 and the reflector 7 through a small hole in the center of the first ground glass 2 with holes; the reflector 7 is obliquely arranged at a certain angle behind the glass window mirror 6, and the angle can be set to be 2 degrees, 3 degrees or 5 degrees.
A second tunable laser 20, a second frosted glass 19 with holes, a glass window mirror 18, a compartment 16, a glass window mirror 15 and a reflector 14 are sequentially arranged, and the geometric centers of all the components are arranged on the same straight line; laser light emitted from the second tunable laser 20 can propagate forward along the geometric centers of the glass window mirror 18, the compartment 16, the glass window mirror 15 and the reflector 14 through a small hole in the center of the second perforated ground glass 19; the mirror 14 is placed obliquely at an angle behind the glass window mirror 15, which may be set at 2 degrees, 3 degrees or 5 degrees.
The laser can pass through the compartment 4 and the compartment 16 again after being reflected by the reflector 7 and the reflector 14, so that the length of the photoacoustic effect acting path is doubled, and due to the inclination of the reflector 7 and the reflector 14, a backward reflection light path and a forward propagation light path form a small angle and can be blocked by the first perforated ground glass 2 and the second perforated ground 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 consists of two parts, and the two parts are symmetrically arranged. The two same glass cylindrical compartments 4 and 16 of the differential Helmholtz resonant cavity pass laser light with different wave bands, and correspond to gases with different wave bands of the photoacoustic effect; the compartment 4 and the compartment 16 are connected by two capillary glass tubes 8 and 11. When the photoacoustic effect occurs, the sound pressure will circulate between the compartment 4 and the compartment 16 through the capillary glass tube 8 and the capillary glass tube 11; if the laser is pulsed, two periodic acoustic pressure waves are generated in compartment 4 and compartment 16, respectively, which have the same frequency and amplitude but opposite phase. If the frequency of the laser pulse is modulated to be the same as the resonant frequency of the differential helmholtz resonator, a standing wave of maximum amplitude (resonant photoacoustic signal) is generated, causing the photoacoustic signal to be enhanced. An electret microphone 5 and an electret microphone 17 are respectively arranged between the compartment 4 and the compartment 16 and used as sound sensors, and signals detected by the electret microphone 5 and the electret microphone 17 enter a phase-locked amplifier to carry out differential operation and then are introduced into an oscilloscope.
The differential Helmholtz resonant cavity is characterized in that the photoacoustic spectrum is enhanced by the following steps: the symmetrical resonator of two identical compartments 4 and 16 produces photoacoustic absorption signals that are out of phase, while the noise comprising flow noise in the two 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, the present application relates to a gas detection device O in transformer oil2A detection result graph;
during detection, the second tunable laser 20 is closed, the first tunable laser 1 is modulated to enable the wavelength to be 764.3nm, the pulse frequency to be 260Hz and the square wave duty ratio to be 50%, and 50000ppm of O is introduced through the sleeve type air vent 92(bottom gas is 1bar of N2) The obtained detection chartAs shown in fig. 2, the noise equivalent detection limit achieved by analysis was 600 ppm.
Referring to FIG. 3, the present application is directed to a gas detection device CO in transformer oil2Detecting the result;
turning off the first tunable laser 1, modulating the second tunable laser 20 to make the wavelength 1.573 μm, the pulse frequency 220Hz, the square wave duty ratio 50%, and introducing 1000ppm of CO through the sleeve type vent 132(bottom gas is 1bar of N2) The resulting detection plot is shown in FIG. 3, and the noise equivalent detection limit achieved by analysis is 160 ppm.
According to the technical scheme, the application provides a gas detection device in transformer oil includes: 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 perforated ground glass 2 and a second perforated ground glass 19; the first perforated ground glass 2 is positioned between the first tunable laser 1 and the differential Helmholtz resonator; the second perforated ground glass 19 is positioned between the second tunable laser 20 and the differential Helmholtz resonator; the photoacoustic signal detection unit comprises an electret microphone 5, an electret microphone 7, a phase-locked amplifier 21 and an oscilloscope 22; the electret microphones 5 and 7 are connected with the phase-locked amplifier 21 and the oscilloscope 22; the sound signals detected by the electret microphones 5 and 7 are out of phase, and the sound signals are input into the phase-locked amplifier 21 for differential operation and amplification and then input into the oscilloscope 22 for display. The gas detection device in transformer oil utilizes two tunable lasers, and gas of absorption effect at different wave bands can be detected under the condition that the lasers are not required to be replaced. Can be used for detecting CO and CO2，O2，N2And the like. And each laser correspondingly generates a photoacoustic signal, and the two photoacoustic signals are respectively detected and differentiated by using the two electret microphones, so that the effects of eliminating noise and enhancing signals are achieved, and the high-sensitivity trace gas detection is realized. Because the wavelength of the absorption effect of different gases is different, the device can realize extremely high selectivity,and has excellent cross-interference resistance.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
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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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| CN202110017766.0A CN112630165B (en) | 2021-01-07 | 2021-01-07 | Detection device for gas in transformer oil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114088632A (en) * | 2021-11-18 | 2022-02-25 | 国网安徽省电力有限公司电力科学研究院 | A kind of hydrogen sulfide gas detection method and device based on optical fiber photoacoustic sensing |
| CN115201116A (en) * | 2022-09-15 | 2022-10-18 | 中国科学院合肥物质科学研究院 | Low-noise differential type Helmholtz photoacoustic spectrum detection device and method |
| 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 |
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| CN115201116A (en) * | 2022-09-15 | 2022-10-18 | 中国科学院合肥物质科学研究院 | Low-noise differential type Helmholtz photoacoustic spectrum detection device and method |
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