CN105928885A - All-optical cavity-based Online monitoring device for photoacoustic spectrum transformer - Google Patents
All-optical cavity-based Online monitoring device for photoacoustic spectrum transformer Download PDFInfo
- Publication number
- CN105928885A CN105928885A CN201610517425.9A CN201610517425A CN105928885A CN 105928885 A CN105928885 A CN 105928885A CN 201610517425 A CN201610517425 A CN 201610517425A CN 105928885 A CN105928885 A CN 105928885A
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- China
- Prior art keywords
- online monitoring
- light source
- monitoring device
- cavity
- gasmetry
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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
-
- 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
- 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
Abstract
The invention discloses an all-optical cavity-based online monitoring device for a photoacoustic spectrum transformer. The device comprises a light source and a gas measurement cavity, wherein an emergent ray of the light source enters the gas measurement cavity through a light window; and an optical microring sensor or an optical fiber sensor is arranged on the bottom surface of the gas measurement cavity. A traditional rheomicrophone is replaced with the optical microring sensor or the optical fiber sensor; the overall photoacoustic cavity does not contain an electroacoustic device, completely comprises optical devices, is not affected by any electromagnetic interference on the spot; the response bandwidth is high; an all-optical photoacoustic cavity-based online monitoring system for the photoacoustic spectrum transformer is achieved; the all-optical cavity-based online monitoring device for the photoacoustic spectrum transformer has the advantages of good electromagnetic compatibility, high anti-jamming capability and high resolution ratio; the operation lifetime is prolonged; and the reliability is improved.
Description
Technical field
The present invention relates to optoacoustic spectroscopy transformer online monitoring technology, particularly one exist based on full optics cavity optoacoustic spectroscopy transformator
Line monitoring device.
Background technology
Oil immersed power transformer is after longtime running neutralizes and breaks down, under heat, electro ultrafiltration, and its insulating oil and organic insulation material
Material can decomposite some gases valuable to breakdown judge, including hydrogen, methane, acetylene, ethylene, carbon monoxide, dioxy
Changing carbon etc., analyzing these gases dissolved in oil is to judge oil immersed power transformer early stage Hidden fault most convenient, maximally effective
One of measure.Optoacoustic spectroscopy is a kind of technology detecting absorbent volume fraction based on optoacoustic effect, and this technology has inspection
Surveying wide ranges, precision is high, is not required to the features such as carrier gas, and this technology is applied to oil immersed power transformer on-line monitoring, can be accurately
Judge gas componant and the content thereof dissolved in transformer oil, thus be accurately judged to transformator operation conditions, safeguard for transformator
Reliable Informational support is provided.
Gas photocaustic spectroscopy is the concentration that the absorption of light source photon energy is come quantitative analysis gas by detected gas molecule, it
Belong to and measure the analysis method for gases absorbed, add relative to the detection method directly measuring optical radiation energy and heat energy is become sound
The process of tone signal, the method falling within heat determination.If light source is modulated with certain audio frequency, at a special optoacoustic
The acoustical signal identical with frequency just can be detected by mike in pond, here it is material photoacoustic signal to be measured.
Signal is received by electricity transformer monitoring product and process means suitable is higher, and transformer body and electric power monitoring product
In electronic device operationally can produce high frequency electromagnetic radiation interference.
At present optoacoustic spectroscopy transformer online monitoring system use in PA cell electro-acoustic element mike as acoustic sensor, often
Photo acoustic spectrometry system be use DC Steady infrared light supply+chopper wheel+optical filter+gasmetry chamber+microphonic scheme enter
Row detection.Having sealed mike and backplane circuit thereof in PA cell up for safekeeping, when light concentration gas detects, the light beam that light source sends irradiates
In mike with backplane circuit, reasons for its use signal forms very big co-channel interference to the photoacoustic signal from detected gas,
Electromagnetic radiation in environment simultaneously also easily produces High-frequency Interference to mike and circuit.Additionally, mike is due to its bandwidth and sensitive
The restriction of degree, when light concentration gas detects, external action can cause it finally to detect the instability of data.
Summary of the invention
For problems of the prior art, the invention provides a kind of will not be affected by on-the-spot any electromagnetic interference, thorough
The end, realizes optoacoustic spectroscopy transformer online monitoring system based on full optics PA cell, has Electro Magnetic Compatibility good, capacity of resisting disturbance
By force, improve service life and reliability based on full optics cavity optoacoustic spectroscopy transformer online monitoring device.
The purpose of the present invention is achieved through the following technical solutions.
Based on full optics cavity optoacoustic spectroscopy transformer online monitoring device, including light source and gasmetry chamber, the outgoing of described light source
Light injects gasmetry intracavity by light window, and bottom surface, gasmetry chamber is provided with optics micro-ring sensor or Fibre Optical Sensor.
Further, described light source is DC Steady infrared light supply, depends between described DC Steady infrared light supply and gasmetry chamber
Secondary be provided with chopper wheel and filter wheel, described filter wheel be provided with filter lens, described DC Steady infrared light supply is radiated at after being modulated dish
On filter wheel, the emergent ray of described filter lens injects gasmetry intracavity by light window.
Further, described light source is tunable pulsed infrared laser light light source, the emergent light in described tunable pulsed infrared laser light source
Line injects gasmetry intracavity by light window.
Further, containing matcoveredn, polymer micro-loop layer and silicon oxide base layer on described optics micro-ring sensor, described
Protective layer, polymer micro-loop layer and silicon oxide base layer are all transparent.
Further, described Fibre Optical Sensor is containing matcoveredn, optical fiber layer and silicon oxide base layer, described protective layer, optical fiber
Layer is all transparent with silicon oxide base layer.
Compared to prior art, it is an advantage of the current invention that: utilize optics micro-ring sensor or Fibre Optical Sensor to replace traditional micro-
Sound device, solves the interference problem of electromagnetic signal, and owing to whole chamber interior does not has any electronic devices and components, this system will not
Affected by on-the-spot any electromagnetic interference, it is achieved that optoacoustic spectroscopy transformer online monitoring system based on full optics PA cell,
Having Electro Magnetic Compatibility good, capacity of resisting disturbance is strong, and high-resolution advantage improves service life and reliability.Optics micro-loop
Sensor or Fibre Optical Sensor have ultra-wide band frequency response ability, using the teaching of the invention it is possible to provide enough measure sensitivity.With tradition electroacoustic microphony
Device is compared, and reduces light source and shines directly into sensor and the substrate ambient noise signal of generation on substrate circuit, improves detection
Sensitivity from the effective photoacoustic signal of light concentration gas.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the embodiment of the present invention 2.
Fig. 3 is the structural representation of the embodiment of the present invention 3.
Fig. 4 is the structural representation of the embodiment of the present invention 4.
Fig. 5 is the optics micro-ring sensor schematic diagram utilizing high molecular polymer to research and develop.
Fig. 6 is optics micro-ring sensor outgoing spectrum schematic diagram.
Fig. 7 is the contrast schematic diagram of optics micro-ring sensor and common microphonic frequency response curve.
In figure: 1, DC Steady infrared light supply 2, tunable pulsed infrared laser light light source 3, chopper wheel 4, filter wheel 5,
Filter lens 6, light window 7, gasmetry chamber 8, protective layer 9, optics micro-ring sensor 10, Fibre Optical Sensor 11,
Silicon oxide base layer.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the present invention is described in detail.
Embodiment 1
As it is shown in figure 1, based on full optics cavity optoacoustic spectroscopy transformer online monitoring device, including DC Steady infrared light supply 1,
Filter wheel 4 and gasmetry chamber 7, be provided with chopper wheel 3, described filter between described DC Steady infrared light supply 1 and filter wheel 4
Wheel 4 is provided with filter lens 5, and the emergent ray of described filter wheel 4 is injected in gasmetry chamber 7 by light window 6, described gas
Bottom surface, bulk measurement chamber 7 is provided with optics micro-ring sensor 9, and described optics micro-ring sensor 9 is containing matcoveredn 8 and polymer micro-loop
Layer and silicon oxide base layer 11, described all layers are all transparent.
Embodiment 2
As in figure 2 it is shown, based on full optics cavity optoacoustic spectroscopy transformer online monitoring device, including DC Steady infrared light supply 1,
Filter wheel 4 and gasmetry chamber 7, be provided with chopper wheel 3, described filter between described DC Steady infrared light supply 1 and filter wheel 4
Wheel 4 is provided with filter lens 5, and the emergent ray of described filter wheel 4 is injected in gasmetry chamber 7 by light window 6, described gas
Bottom surface, bulk measurement chamber 7 is provided with Fibre Optical Sensor 10, and described Fibre Optical Sensor 10 contains matcoveredn 8 and optical fiber layer and silicon dioxide
Basal layer 11, described all layers are all transparent.
Embodiment 3
As it is shown on figure 3, based on full optics cavity optoacoustic spectroscopy transformer online monitoring device, including tunable pulsed infrared laser light light
Source 2 and gasmetry chamber 7, the emergent ray after tuning is penetrated by described tunable pulsed infrared laser light light source 2 by light window 6
Enter in gasmetry chamber 7, between described gasmetry chamber 7 and substrate 11, be provided with optics micro-ring sensor 9, described optics micro-loop
Sensor 9 contains matcoveredn 8 and polymer micro-loop layer and silicon oxide base layer 11, and described all layers are all transparent.
Embodiment 4
As shown in Figure 4, base is based on full optics cavity optoacoustic spectroscopy transformer online monitoring device, including tunable pulsed infrared laser light
Light source 2 and gasmetry chamber 7, the emergent ray after tuning is passed through light window 6 by described tunable pulsed infrared laser light light source 2
Inject in gasmetry chamber 7, between described gasmetry chamber 7 and substrate 11, be provided with Fibre Optical Sensor 10, described Fibre Optical Sensor
Device 10 contains matcoveredn 8 and optical fiber layer and silicon oxide base layer 11, and described all layers are all transparent.
Optics micro-ring sensor 9 operation principle
As it is shown in figure 5, utilize the optics micro-ring sensor schematic diagram that high molecular polymer is researched and developed, this sensor by straight waveguide and
Disc waveguide forms, and disc waveguide size can design at tens microns to hundred micron number magnitudes, between straight waveguide and disc waveguide
Distance can design in tens nanometers to hundred nanometer scale.
Light wave is propagated in straight waveguide and is coupled in micro-loop form stationary field, when the phase of light wave through micro-loop is the whole of 2 π
During several times, by generation resonance phenomena so that outgoing spectrum forms precipitate low ebb at respective wavelength, as shown in Figure 6.
When photoacoustic signal transmits, its acoustic pressure can make polymer light refractive index under stress effect change, so that micro-ring resonant
Wavelength is subjected to displacement.Selecting straight waveguide lambda1-wavelength at the Ban Yaochu of low ebb shown in Fig. 6, the change of such photoacoustic signal is just
It is converted into the change of exiting light beam intensity.The change being derived and finally recording exiting light beam intensity by optical fiber is achieved with in PA cell
The change of photoacoustic signal.
Resonance Q value is depended in the measurement sensitivity of optics micro-ring sensor 9.Resonance low ebb is the most precipitous, and Q-value is the highest,
Measure sensitivity the highest.Actual measurement micro-loop Q-value can reach 3 × 105, its detection sensitivity can reach 29Pa noise equivalent and can survey
Acoustic pressure (NEDP).
The occasion that full optics cavity optoacoustic spectroscopy on-line measurement adapts to
Optics micro-ring sensor has ultra-wide band frequency response, and from direct current to 100,000,000, potential ability can reach GHz, and this is for super
Low frequency has incomparable advantage with the detection of hyperfrequency photoacoustic signal.As it is shown in fig. 7, be that optics micro-ring sensor is with common
The contrast of microphonic frequency response curve.Surveyed gas optoacoustic is excited when using chopper wheel 3 to modulate DC Steady infrared light supply 1
During signal, modulating frequency generally only several hertz to tens hertz, common mike is very big at this low-frequency band response attenuation,
Cannot provide and enough measure sensitivity.And use high-frequency tunable pulsed infrared laser 2 as light source activation surveyed gas optoacoustic
During signal, a kind of trend is PA cell ultraminiaturization, may cause the detection of hyperfrequency photoacoustic signal, common microphony here
Device also good response offer cannot enough measure sensitivity in this frequency range.Micro-loop photoacoustic sensors has ultra-wide band frequency response ability,
The full optics cavity optoacoustic spectroscopy on-line monitoring technique constituted based on it can meet the requirement of above-mentioned occasion.
Claims (5)
1. based on full optics cavity optoacoustic spectroscopy transformer online monitoring device, including light source and gasmetry chamber, the emergent ray of described light source injects gasmetry intracavity by light window, it is characterised in that bottom surface, gasmetry chamber is provided with optics micro-ring sensor or Fibre Optical Sensor.
The most according to claim 1 based on full optics cavity optoacoustic spectroscopy transformer online monitoring device, it is characterized in that described light source is DC Steady infrared light supply, chopper wheel and filter wheel it is sequentially provided with between described DC Steady infrared light supply and gasmetry chamber, described filter wheel is provided with filter lens, described DC Steady infrared light supply is radiated at after being modulated dish on filter wheel, and the emergent ray of described filter lens injects gasmetry intracavity by light window.
The most according to claim 1 based on full optics cavity optoacoustic spectroscopy transformer online monitoring device, it is characterized in that described light source is tunable pulsed infrared laser light light source, the emergent ray in described tunable pulsed infrared laser light source injects gasmetry intracavity by light window.
4. according to described in claim 1,2 or 3 based on full optics cavity optoacoustic spectroscopy transformer online monitoring device; it is characterized in that described protective layer, polymer micro-loop layer and silicon oxide base layer are all transparent containing matcoveredn, polymer micro-loop layer and silicon oxide base layer on described optics micro-ring sensor.
5. according to described in claim 1,2 or 3 based on full optics cavity optoacoustic spectroscopy transformer online monitoring device; it is characterized in that described Fibre Optical Sensor is all transparent containing matcoveredn, optical fiber layer and silicon oxide base layer, described protective layer, optical fiber layer and silicon oxide base layer.
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| CN201610517425.9A CN105928885A (en) | 2016-07-04 | 2016-07-04 | All-optical cavity-based Online monitoring device for photoacoustic spectrum transformer |
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| CN201610517425.9A CN105928885A (en) | 2016-07-04 | 2016-07-04 | All-optical cavity-based Online monitoring device for photoacoustic spectrum transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112683835A (en) * | 2020-12-18 | 2021-04-20 | 上海集成电路研发中心有限公司 | Mixed gas detection device and system |
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| US20080095490A1 (en) * | 2004-09-08 | 2008-04-24 | The Regents Of The University Of Michigan | High Frequency Ultrasound Detection Using Polymer Optical-Ring Resonator |
| DE102008047658B3 (en) * | 2008-09-12 | 2010-01-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Gas sensor and use of a gas sensor |
| CN201749080U (en) * | 2010-07-28 | 2011-02-16 | 山东大学 | Photoacoustic spectroscopy gas detection system based on distributed feedback fiber laser |
| CN102539338A (en) * | 2011-12-30 | 2012-07-04 | 昆山和智电气设备有限公司 | Online monitoring system for gas content in transformer oil by using photoacoustic spectrum |
| CN103439268A (en) * | 2013-09-05 | 2013-12-11 | 安徽大学 | High-sensitivity diaphragm type photoacoustic spectrum sensor based on self-mixing |
| CN104807765A (en) * | 2015-05-04 | 2015-07-29 | 华北电力大学 | High-sensitivity spectral absorption damped oscillation cavity gas detection device of transformer oil |
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| US20080095490A1 (en) * | 2004-09-08 | 2008-04-24 | The Regents Of The University Of Michigan | High Frequency Ultrasound Detection Using Polymer Optical-Ring Resonator |
| DE102008047658B3 (en) * | 2008-09-12 | 2010-01-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Gas sensor and use of a gas sensor |
| CN201749080U (en) * | 2010-07-28 | 2011-02-16 | 山东大学 | Photoacoustic spectroscopy gas detection system based on distributed feedback fiber laser |
| CN102539338A (en) * | 2011-12-30 | 2012-07-04 | 昆山和智电气设备有限公司 | Online monitoring system for gas content in transformer oil by using photoacoustic spectrum |
| CN103439268A (en) * | 2013-09-05 | 2013-12-11 | 安徽大学 | High-sensitivity diaphragm type photoacoustic spectrum sensor based on self-mixing |
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| CN112683835A (en) * | 2020-12-18 | 2021-04-20 | 上海集成电路研发中心有限公司 | Mixed gas detection device and system |
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