CN104062265A - Detection device and detection method for multi-component gas in transformer oil based on spectrum analysis - Google Patents
Detection device and detection method for multi-component gas in transformer oil based on spectrum analysis Download PDFInfo
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- CN104062265A CN104062265A CN201410332599.9A CN201410332599A CN104062265A CN 104062265 A CN104062265 A CN 104062265A CN 201410332599 A CN201410332599 A CN 201410332599A CN 104062265 A CN104062265 A CN 104062265A
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Abstract
The invention relates to a detection device and a detection method for multi-component gas in transformer oil based on a spectrum analysis. The detection device comprises a wavelength adjustable light source, a modulation circuit, a gas chamber, a photoelectric detector, a signal acquisition processing circuit and a computer; a time division multiplexing idea is adopted for controlling narrow line width light with different central wavelengths to be output by a light source in different time periods; each wavelength corresponds to a specific absorption spectrum peak of gas to be detected; spectral absorption of the corresponding gas is analyzed to obtain a concentrated value. The detection device for the multi-component gas in the transformer oil based on the spectrum analysis, which is simple in structure and low in cost, adopts the time division multiplexing idea to realize rapid and reliable detection of the multi-component gas in the transformer oil. The problem that the detection is difficult, caused by overlapping of different gas spectral signals, is solved so as to realize synchronous detection of the plurality of types of gas; the detection device is high in measurement sensitivity, rapid in responding speed, compact and simple in structure and low in system cost.
Description
Technical field
The present invention relates to a kind of pick-up unit and method of multicomponent gas, be specifically related to detection of gas with multiple constituents device and method in a kind of transformer oil based on spectral analysis.
Background technology
Dissolved gas analysis is to judge one of the early stage latency fault of oil-immersed power transformer most convenient, effective method, has a good application prospect at the online evaluation of running state of transformer and the prediction field of residual life.Composition to oil dissolved gas and content analysis are prerequisite and the keys of the method quickly and accurately.At present, conventional dissolved gas analysis technology has vapor-phase chromatography and electrochemical sensor method.But in long-term use, many deficiencies of these methods come out gradually, for example sampling is complicated, can consume sample gas and carrier gas in testing process, analysis time is long etc.
Along with the development of optical device, spectrographic method is progressively applied at dissolved gas analysis.The principle of work of spectrographic method is based on absorbance law (lambert's one Beer law), and its measurement range is wide, and sensitivity and precision are all higher, and fast response time can be realized the continuous analysis of multicomponent gas and automatically control.What in the method, application was at present maximum is Fourier's infrared spectrum and optoacoustic spectroscopy, wherein Fourier's infrared spectrum technology is difficult to avoid the intersection between gas to absorb interference, Shortcomings in detection sensitivity and reliability, although and optoacoustic spectroscopy is more preponderated in sensitivity and stability, but its system forms complicated, cost is higher, is subject in actual applications certain limitation.
Summary of the invention
For the problems referred to above, the invention provides one easy to operate, detection of gas with multiple constituents device and method in the transformer oil based on spectral analysis of fast and reliable.
For addressing the above problem, the technical scheme that the present invention takes is: detection of gas with multiple constituents device in the transformer oil based on spectral analysis, comprise Wavelength tunable light source, air chamber, photodetector, signal acquisition processing circuit and computing machine, air chamber is for depositing the transformer oil that contains multiple gases, and computing machine is for calculating the concentration of gas to be measured according to the optical information after gas absorption to be measured; Wavelength tunable light source is connected with air chamber by input optical fibre, and air chamber is connected with photodetector by output optical fibre, and photodetector is connected with computing machine through signal acquisition processing circuit.
Wavelength tunable light source is also provided with modulation circuit, and modulation circuit is for carrying out frequency modulation (PFM) and intensity modulated to light source.Modulation circuit output high frequency sinusoidal modulation signal, carries out frequency modulation (PFM) and intensity modulated to light source.
Described Wavelength tunable light source is tunable laser, realizes wavelength regulation and live width control by the control software in embeddeding computer.Control the different light of light source output center wavelength in different time sections.
In order to realize the different light of light source output center wavelength in different time sections, described Wavelength tunable light source comprises light emitting diode and tunable filtering sheet.
In order to realize the different light of light source output center wavelength in different time sections, described Wavelength tunable light source light source comprises wide range infrared light supply and tunable filtering sheet.
Preferably, signal acquisition processing circuit adopts lock-in amplifier.
Described photodetector is photomultiplier or avalanche diode or photodiode.
Described air chamber is transmission-type air chamber or reflective air chamber.
Application said apparatus carries out detection of gas with multiple constituents method in the transformer oil based on spectral analysis,
This method adopts time division multiplexing idea, control the different narrow linewidth light of Wavelength tunable light source output center wavelength in different time sections, the specific absorption spectrum peak of the corresponding a kind of gas to be detected of each wavelength, obtains its concentration value by analyzing the spectral absorption of corresponding gas, comprises the steps:
1) export the narrow linewidth light of wavelength corresponding thereto according to the characteristic absorpting spectrum peak control Wavelength tunable light source of gas to be detected;
2) light is in input optical fibre transmission inlet plenum, and the absorption spectra peak gas generation spectral absorption corresponding with this wavelength in air chamber, causes that light intensity changes;
3) output of the light after spectral absorption air chamber, is transported to photodetector through output optical fibre and carries out opto-electronic conversion;
4) the signal entering signal acquisition process circuit after opto-electronic conversion gathers useful signal, and input computing machine, according to the corresponding relation of the residue luminous power after gas absorption or the humorous intensity of wave of corresponding order and gas concentration, obtains this gas concentration.
Gases Dissolved in Transformer Oil generally comprises methane, ethane, ethene, acetylene, carbon monoxide, carbon dioxide and steam.Record after a kind of gas concentration, change light source output wavelength, make it the characteristic absorpting spectrum peak of corresponding another kind of gas to be detected, repeat above-mentioned steps, detect until complete all gas.
The live width of light source output narrow linewidth light need be less than or equal to 10MHz.The characteristic absorption peak of gas has certain live width, and the live width of light source output narrow linewidth light is less than or equal to 10MHz and ensures that the live width of light is much smaller than the absorption peak live width of gas, thereby light is absorbed by specific gas, accurately judges the concentration of this kind of gas.
The present invention, by detection of gas with multiple constituents device in the transformer oil based on spectral analysis simple in structure, with low cost, adopts time division multiplexing idea, and the fast and reliable that realizes multicomponent gas in transformer oil detects.Solved the overlapping detection difficult problem causing of gas with various spectral signal, realized the synchronous detection of multiple gases, measure highly sensitive, fast response time, compact conformation is simple, system cost is cheap.
Brief description of the drawings
Fig. 1 is the structural drawing of the embodiment of the present invention 1;
Fig. 2 is the process flow diagram of the embodiment of the present invention 1;
Wherein, 1, modulation circuit, 2, laser instrument, 3, input optical fibre, 4, air chamber, 5, output optical fibre, 6, photodetector, 7, lock-in amplifier, 8, computing machine.
Embodiment
Detection of gas with multiple constituents device in transformer oil based on spectral analysis, comprise Wavelength tunable light source, air chamber 4, photodetector 6, signal acquisition processing circuit and computing machine 8, air chamber 4 is for depositing the transformer oil that contains multiple gases, and computing machine 8 is for calculating the concentration of gas to be measured according to the optical information after gas absorption to be measured; Wavelength tunable light source is connected with air chamber 4 by input optical fibre 3, and air chamber 4 is connected with photodetector 6 by output optical fibre 5, and photodetector 6 is connected with computing machine 8 through signal acquisition processing circuit.Wavelength tunable light source is also provided with modulation circuit 1, and modulation circuit 1 is for carrying out frequency modulation (PFM) and intensity modulated to light source.Described Wavelength tunable light source is tunable laser 2, realizes wavelength regulation and live width control or described Wavelength tunable light source comprise that light emitting diode and tunable filtering sheet or described light source comprise wide range infrared light supply and tunable filtering sheet by the control software in embeddeding computer 8.Described signal acquisition processing circuit adopts lock-in amplifier 7.Described photodetector 6 is photomultiplier or avalanche diode or photodiode.Described air chamber 4 is transmission-type air chamber or reflective air chamber.
Application said apparatus carries out detection of gas with multiple constituents method in the transformer oil based on spectral analysis, this method adopts time division multiplexing idea, control the different narrow linewidth light of light source output center wavelength in different time sections, the specific absorption spectrum peak of the corresponding a kind of gas to be detected of each wavelength, obtain its concentration value by analyzing the spectral absorption of corresponding gas, comprise the steps:
1) export the narrow linewidth light of wavelength corresponding thereto according to the characteristic absorpting spectrum peak control Wavelength tunable light source of gas to be detected, the live width of light source output narrow linewidth light need be less than or equal to 10MHz;
2) light transmits in inlet plenum 4 through input optical fibre 3, and the absorption spectra peak gas generation spectral absorption corresponding with this wavelength in air chamber 4 causes that light intensity changes;
3) output of the light after spectral absorption air chamber 4, is transported to photodetector 6 through output optical fibre 5 and carries out opto-electronic conversion;
4) the signal entering signal acquisition process circuit after opto-electronic conversion gathers useful signal, and input computing machine, according to the corresponding relation of the residue luminous power after gas absorption or the humorous intensity of wave of corresponding order and gas concentration, is analyzed and obtained this gas concentration.
Gases Dissolved in Transformer Oil generally comprises methane, ethane, ethene, acetylene, carbon monoxide, carbon dioxide and steam.Record after a kind of gas concentration, change light source output wavelength, make it the characteristic absorpting spectrum peak of corresponding another kind of gas to be detected, repeat above-mentioned steps, detect until complete all gas.
embodiment 1
For convenience of description, again without loss of generality, the present embodiment is set forth detection of gas with multiple constituents method as an example of the analysis of acetylene, carbon monoxide, carbon dioxide example:
(1) computing machine 8 is controlled the narrow linewidth light that laser instrument 2 output center wavelengths are 1.53 μ m, the absorption spectra peak of corresponding acetylene, and modulation circuit 1 is exported high frequency sinusoidal modulation signal simultaneously, and laser instrument 2 is carried out to frequency modulation (PFM) and intensity modulated; Light source is selected Photline ModBox-TTX laser instrument 2 herein, wavelength coverage can cover acetylene, carbon monoxide, carbon dioxide absorption peak (the acetylene 1.53 μ m in silica fibre low loss window, carbon monoxide 1.567 μ m, carbon dioxide 1.573 μ m).Output linewidth is only 100kHz, much smaller than gas absorption live width (generally in GHz magnitude).Laser instrument 2 is furnished with PC end and controls software, realizes wavelength regulation by software, this software can with PC on system data process software carry out interface communication, thereby in data processing software, control output wavelength; Keep narrow linewidth output simultaneously.
(2) utilize input optical fibre 3 to import light into transmission-type air chamber; If there is acetylene in air chamber, can there is spectral absorption at 1.53 μ m places in the acetylene in air chamber, causes that light intensity changes;
(3) utilize output optical fibre 5 that light is delivered to InGaAs PIN diode by air chamber and complete opto-electronic conversion; Photodetector 6 adopts InGaAs PIN diode herein.
(4) photoelectric conversion signal is sent into computing machine 8 through lock-in amplifier 7, the first harmonic amplitude detecting and second harmonic amplitude are sent into computing machine 8, computing machine 8 carries out obtaining after division is processed the concentration information of acetylene, and signal acquisition processing circuit is herein selected lock-in amplifier.
Computer controlled laser centre wavelength is 1.567 μ m, the suction spectrum peak of corresponding carbon monoxide, and repeating step 1 ~ 4, obtains carbonomonoxide concentration; Computer controlled laser centre wavelength is 1.573 μ m, the absorption spectra peak of corresponding carbon monoxide, and repeating step 1 ~ 4, obtains gas concentration lwevel.
It is that prior art does not repeat them here that computing machine obtains this gas concentration according to the corresponding relation of the residue luminous power after gas absorption or the humorous intensity of wave of corresponding order and gas concentration.
Above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, every the specific embodiment of the present invention is modified or is equal to replacement, and do not depart from any amendment of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. detection of gas with multiple constituents device in the transformer oil based on spectral analysis, it is characterized in that: comprise Wavelength tunable light source, air chamber (4), photodetector (6), signal acquisition processing circuit and computing machine (8), air chamber (4) is for depositing the transformer oil that contains multiple gases, and computing machine (8) is for calculating the concentration of gas to be measured according to the optical information after gas absorption to be measured; Wavelength tunable light source is connected with air chamber (4) by input optical fibre (3), and air chamber (4) is connected with photodetector (6) by output optical fibre (5), and photodetector (6) is connected with computing machine (8) through signal acquisition processing circuit.
2. detection of gas with multiple constituents device in the transformer oil based on spectral analysis according to claim 1, it is characterized in that: Wavelength tunable light source is also provided with modulation circuit (1), modulation circuit (1) is for carrying out frequency modulation (PFM) and intensity modulated to Wavelength tunable light source.
3. detection of gas with multiple constituents device in the transformer oil based on spectral analysis according to claim 2, it is characterized in that: described Wavelength tunable light source is tunable laser (2), realize wavelength regulation and live width control by the control software in embeddeding computer (8).
4. detection of gas with multiple constituents device in the transformer oil based on spectral analysis according to claim 2, is characterized in that: described Wavelength tunable light source comprises light emitting diode, and wavelength and live width regulate and realize by tunable optical filter.
5. detection of gas with multiple constituents device in the transformer oil based on spectral analysis according to claim 2, is characterized in that: described Wavelength tunable light source comprises wide range infrared light supply, and wavelength and live width regulate and realize by tunable optical filter.
6. according to detection of gas with multiple constituents device in the transformer oil based on spectral analysis described in claim 3 or 4 or 5, it is characterized in that: described signal acquisition processing circuit adopts lock-in amplifier (7).
7. detection of gas with multiple constituents device in the transformer oil based on spectral analysis according to claim 6, is characterized in that: described photodetector (6) is photomultiplier or avalanche diode or photodiode.
8. detection of gas with multiple constituents device in the transformer oil based on spectral analysis according to claim 7, is characterized in that: described air chamber (4) is transmission-type air chamber or reflective air chamber.
9. application said apparatus carries out detection of gas with multiple constituents method in the transformer oil based on spectral analysis, it is characterized in that comprising the steps:
1) export the narrow linewidth light of wavelength corresponding thereto according to the characteristic absorpting spectrum peak control Wavelength tunable light source of gas to be detected;
2) light is in input (3) Optical Fiber Transmission inlet plenum (4), and the absorption spectra peak gas generation spectral absorption corresponding with this wavelength in air chamber (4), causes that light intensity changes;
3) the output air chamber of the light after spectral absorption (4), is transported to photodetector (6) through output optical fibre (5) and carries out opto-electronic conversion;
4) the signal entering signal acquisition process circuit after opto-electronic conversion gathers useful signal, and input computing machine (8) is analyzed and obtained this gas concentration.
10. detection of gas with multiple constituents method in the transformer oil based on spectral analysis according to claim 9, is characterized in that: the live width of light source output narrow linewidth light need be less than or equal to 10MHz.
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| CN106885978A (en) * | 2017-04-20 | 2017-06-23 | 重庆大学 | A kind of paper oil insulation Diagnosis of Aging based on insulating oil Raman spectrum wavelet-packet energy entropy |
| CN107290298A (en) * | 2017-07-17 | 2017-10-24 | 电子科技大学 | A kind of device and method that mixed gas is detected based on Fast Fourier Transform (FFT) |
| WO2018042135A1 (en) * | 2016-09-05 | 2018-03-08 | Elichens | Method for analysing a gas |
| CN109239008A (en) * | 2018-08-24 | 2019-01-18 | 南京航空航天大学 | A kind of oil-immersed transformer fault detection means based on micro-nano optical fiber evanescent field |
| CN109856077A (en) * | 2018-12-13 | 2019-06-07 | 青岛海纳光电环保有限公司 | Carbonomonoxide concentration detection device and method |
| CN110186867A (en) * | 2019-06-19 | 2019-08-30 | 国家电网有限公司 | A kind of acetylene on-line monitoring system and method suitable for few oily equipment |
| CN111751324A (en) * | 2020-07-22 | 2020-10-09 | 云南电网有限责任公司电力科学研究院 | Harmonic detection device for dissolved gas in transformer oil |
| CN113029996A (en) * | 2021-03-31 | 2021-06-25 | 山东大学 | Hydrogen purity online detection instrument and use method and application thereof |
| CN113125379A (en) * | 2021-03-30 | 2021-07-16 | 中国人民解放军陆军军医大学第一附属医院 | Noninvasive accurate gas detection device and method based on optical fiber supercontinuum laser |
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| CN105806805A (en) * | 2016-04-29 | 2016-07-27 | 河南省日立信股份有限公司 | Extensible test platform based on tunable semiconductor laser absorption spectrum technology |
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| CN106885978A (en) * | 2017-04-20 | 2017-06-23 | 重庆大学 | A kind of paper oil insulation Diagnosis of Aging based on insulating oil Raman spectrum wavelet-packet energy entropy |
| CN107290298A (en) * | 2017-07-17 | 2017-10-24 | 电子科技大学 | A kind of device and method that mixed gas is detected based on Fast Fourier Transform (FFT) |
| CN109239008A (en) * | 2018-08-24 | 2019-01-18 | 南京航空航天大学 | A kind of oil-immersed transformer fault detection means based on micro-nano optical fiber evanescent field |
| CN109856077A (en) * | 2018-12-13 | 2019-06-07 | 青岛海纳光电环保有限公司 | Carbonomonoxide concentration detection device and method |
| CN110186867A (en) * | 2019-06-19 | 2019-08-30 | 国家电网有限公司 | A kind of acetylene on-line monitoring system and method suitable for few oily equipment |
| CN111751324A (en) * | 2020-07-22 | 2020-10-09 | 云南电网有限责任公司电力科学研究院 | Harmonic detection device for dissolved gas in transformer oil |
| CN113125379A (en) * | 2021-03-30 | 2021-07-16 | 中国人民解放军陆军军医大学第一附属医院 | Noninvasive accurate gas detection device and method based on optical fiber supercontinuum laser |
| CN113029996A (en) * | 2021-03-31 | 2021-06-25 | 山东大学 | Hydrogen purity online detection instrument and use method and application thereof |
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Application publication date: 20140924 |