CN103884672A - SF6 gas decomposed product detection device and method based on photoacoustic spectrometry technology - Google Patents
SF6 gas decomposed product detection device and method based on photoacoustic spectrometry technology Download PDFInfo
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- CN103884672A CN103884672A CN201410111420.7A CN201410111420A CN103884672A CN 103884672 A CN103884672 A CN 103884672A CN 201410111420 A CN201410111420 A CN 201410111420A CN 103884672 A CN103884672 A CN 103884672A
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Abstract
The invention relates to the field of detection of gas decomposed products and particularly relates to an SF6 gas decomposed product detection device and an SF6 gas decomposed product detection method based on a photoacoustic spectrometry technology. The SF6 gas decomposed product detection device comprises a shell, wherein the shell is internally provided with a single chip microcomputer and an accessory circuit thereof; the single chip microcomputer and the accessory circuit thereof are connected with a power supply; the single chip microcomputer is connected with an infrared light source by a power switch tube; the infrared light source is arranged opposite to a light source entrance port of a photo-acoustic cell; the photo-acoustic cell is internally provided with a resonant cavity; circular holes communicated with the resonant cavity are formed in the two sides of the photo-acoustic cell; microphones are mounted in the circular holes in the two sides; the microphones are connected with the single chip microcomputer by lock phase amplification circuits; the single chip microcomputer is connected with a display screen; an air inlet and an air outlet which are communicated with the resonant cavity are arranged at the upper end of the photo-acoustic cell. According to the SF6 gas decomposed product detection device and method, the problems of cross interference and electrode poisoning in an electrochemical method are avoided; the system noise is lowered, the detection accuracy is improved, the structure is simple and compact, the volume is small and the stability is good.
Description
Technical field
The present invention relates to a kind of gas decomposition product detection field, particularly a kind of SF6 gas decomposition product pick-up unit and method based on optoacoustic spectroscopy.
Background technology
Along with the fast development of intelligent grid, the electrical equipment using SF6 gas as insulating medium is able to a large amount of utilizations, and the detection of SF6 gas decomposition product is the effective ways of diagnosis SF6 equipment operating condition and latency fault.When SF6 inside electric appliance fault, decompose the sulfide producing and mainly contain SO2, H2S, SF4, SO2F SOF2, S2F10 and S2OF10 etc.; Fluoride mainly contains HF, CF4, AlF3, CuF2 and WF6 etc.; Carbonide mainly contains CO, CO2 and low molecular hydrocarbon etc.When wherein tri-kinds of component gas of SO2, H2S and CO can be used as device fails, analyze the characteristic component of judgement.The detector using in industry at present mainly adopts electrochemical sensor detection method, this kind of sensor is subject to sulfide corrosion impact " poisoning " occurs in testing process, easily produce drift or damage, cause testing result inaccurate, its accuracy of measurement is difficult to meet the requirement of diagnosis SF6 equipment latency fault, maintenance cost is high simultaneously, and failure rate is high.
Summary of the invention
According to above deficiency of the prior art, the problem to be solved in the present invention is: provide a kind of reasonable in design, testing result is accurate, and maintenance cost is low, SF6 gas decomposition product pick-up unit and the method based on optoacoustic spectroscopy of failure rate is low.
The technical solution adopted for the present invention to solve the technical problems is:
The described SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy, comprise housing, enclosure interior arranges single-chip microcomputer and accessory circuit thereof, single-chip microcomputer and accessory circuit thereof connect power supply, single-chip microcomputer connects infrared light supply by power switch pipe, infrared light supply is relative with the light source entrance port of photoacoustic cell, photoacoustic cell inside arranges resonator cavity, photoacoustic cell both sides arrange the circular port communicating with resonator cavity, microphone is installed in the circular port of both sides, microphone connects single-chip microcomputer by phase-locked amplifying circuit, single-chip microcomputer connects display screen, photoacoustic cell upper end arranges the air intake opening and the gas outlet that communicate with resonator cavity.
The described SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy has been avoided electrochemical method problem, the problem includes: intersection is disturbed and electrode " poisoning " problem, reduce system noise, improved the accuracy detecting, simple and compact for structure, volume is little, good stability.
Preferred further, photoacoustic cell one end arranges incident mirror, and incident mirror is arranged on light source entrance port place, and the other end arranges catoptron, and incident mirror and catoptron are fixed on the two ends of photoacoustic cell by pressure ring.Promote the light reflectance in the body of pond, increase light intensity.
Preferred further, between incident mirror and catoptron, form resonator cavity, resonator cavity two ends arrange surge chamber.
Preferred further, infrared light supply adopts infrared filament, and infrared light supply front end arranges optical filter.After mating plate filters after filtration, obtain the spectrum of characteristic frequency wavelength, to excite the air release heat energy of required detection.
Preferred further, microphone adopts silicon microphone.The output of SPA2410LR5H-B silicon microphone level has very strong positive correlation with magnitudes of acoustic waves size, have higher sensitivity, and frequency response is smooth within the scope of 100 to 10000HZ.
Preferred further, single-chip microcomputer adopts PIC16C74 single-chip microcomputer.Low cost, high reliability.
Preferred further, power acquisition ferric phosphate lithium cell.Ferric phosphate lithium cell security is higher, and uses charging quick and convenient.
Preferred further, housing adopts ABS resin.The ABS resin strength of materials and heatproof characteristic have all met production scene requirement, and the less quality of density is light, is easy to carry, and cost performance is higher.Housing length be 370mm, width is 300mm, is highly 170mm.
The described SF6 gas decomposition product detection method based on optoacoustic spectroscopy, comprises the following steps:
(1) gas to be detected enters into by the air intake opening of photoacoustic cell in the resonator cavity of photoacoustic cell;
(2) opening power, single-chip microcomputer and accessory circuit thereof, power switch pipe, infrared light supply, phase-locked amplifying circuit and display screen energising, single-chip microcomputer carries out SPWM modulation to the switching drive signal of output, by infrared light supply access power switching tube loop, with SPWM signal driver power switch pipe, by power switch pipe, infrared light supply is carried out to electronics modulation, after electronics modulation, infrared light intensity is cyclical variation, after mating plate filters after filtration, obtains the spectrum of characteristic frequency wavelength; The exportable frequency of infrared light supply after ovennodulation is 2500HZ-3500HZ.
(3) spectrum of the characteristic frequency wavelength obtaining enters in photoacoustic cell by light source entrance port, gas to be detected in photoacoustic cell is subject to narrow band light pulse irradiation, gas molecule is by its characteristic absorption frequency absorption optical radiation, gas absorption energy and the proportional relation of its concentration, and will to absorb energy Partial Conversion be heat energy, gas is periodically heated according to incident light pulse, and the cyclic fluctuation of gas temperature causes pressure surge; The resonance frequency of photoacoustic cell is 2800HZ-3000HZ.
(4) periodic pressure fluctuation detects by microphone, acoustic energy is transformed into electric signal by microphone, electric signal is passed to single-chip microcomputer by signal after improving signal to noise ratio (S/N ratio) by phase-locked amplifying circuit, and single-chip microcomputer obtains detecting the concentration value of gas by analysis with after calculating, and finally shows by display screen.
The beneficial effect that the present invention has is:
1, use photocaustic spectroscopy to analyze SF6 decomposition product content, avoided electrochemical method problem, the problem includes: intersection is disturbed and electrode " poisoning " problem, improved the accuracy detecting, reduced cost.
2, adopt silicon microphone to detect photoacoustic signal, reduce system noise and improved detection sensitivity, in the additional lock-in amplifier of silicon microphone output unit loop, screened and amplify and needed pressure wave signal, significantly suppress useless noise, improve the signal to noise ratio (S/N ratio) detecting.
3, by MOSFET power switch pipe modulated infrared light source frequency, good stability, affected by extraneous vibration little, and it is long to have the life-span, and the advantage of machinery-free contact has greatly improved functional reliability, simple and compact for structure, has reduced volume, has improved reliability.
Brief description of the drawings
Fig. 1 is structural principle block diagram of the present invention;
Fig. 2 is structural representation of the present invention;
Fig. 3 is the structural representation of photoacoustic cell of the present invention;
Fig. 4 is phase-locked amplifying circuit equivalent circuit diagram;
Wherein, 1, housing; 2, infrared light supply; 3, single-chip microcomputer; 4, power switch pipe; 5, power supply; 6, photoacoustic cell; 7, circular port; 8, light source entrance port; 9, optical filter; 10, pressure ring; 11, resonator cavity; 12, microphone; 13, phase-locked amplifying circuit; 14, incident mirror; 15, air intake opening; 16, gas outlet; 17, surge chamber; 18, catoptron.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described further:
As Fig. 1, Fig. 2, Fig. 3, shown in Fig. 4, SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy of the present invention, comprise housing 1, housing 1 inside arranges single-chip microcomputer 3 and accessory circuit thereof, single-chip microcomputer 3 and accessory circuit thereof connect power supply 5, single-chip microcomputer 3 connects infrared light supply 2 by power switch pipe 4, infrared light supply 2 is relative with the light source entrance port 8 of photoacoustic cell 6, photoacoustic cell 6 inside arrange resonator cavity 11, photoacoustic cell 6 both sides arrange the circular port 7 communicating with resonator cavity 11, the interior installation microphone 12 of circular port 7 of both sides, microphone 12 connects single-chip microcomputer 3 by phase-locked amplifying circuit 13, single-chip microcomputer 3 connects display screen, photoacoustic cell 6 upper ends arrange the air intake opening 15 and the gas outlet 16 that communicate with resonator cavity 11.
Described photoacoustic cell 6 one end arrange incident mirror 14, incident mirror 14 is arranged on 8 places, light source entrance port, the other end arranges catoptron 18, incident mirror 14 and catoptron 18 are fixed on the two ends of photoacoustic cell 6 by pressure ring 10, between incident mirror 14 and catoptron 18, form resonator cavity 18, resonator cavity 11 two ends arrange surge chamber 17.
Wherein, infrared light supply 2 adopts infrared filament, and infrared light supply 2 front ends arrange optical filter 9, and microphone 12 adopts silicon microphone, and single-chip microcomputer 3 adopts PIC16C74 single-chip microcomputer, and power supply 5 adopts ferric phosphate lithium cell, and housing 1 adopts ABS resin.
SF6 gas decomposition product detection method based on optoacoustic spectroscopy, comprises the following steps:
(1) gas to be detected enters into by the air intake opening 15 of photoacoustic cell 6 in the resonator cavity 11 of photoacoustic cell 6;
(2) opening power 5, single-chip microcomputer 3 and accessory circuit thereof, power switch pipe 4, infrared light supply 2, phase-locked amplifying circuit 13 and display screen energising, single-chip microcomputer 3 carries out SPWM modulation to the switching drive signal of output, by infrared light supply access power switching tube loop, with SPWM signal driver power switch pipe, by power switch pipe, infrared light supply 2 is carried out to electronics modulation, after electronics modulation, infrared light intensity is cyclical variation, after mating plate filters after filtration, obtain the spectrum of characteristic frequency wavelength, to excite the air release heat energy of required detection;
(3) spectrum of the characteristic frequency wavelength obtaining enters in photoacoustic cell 6 by light source entrance port 8, gas to be detected in photoacoustic cell 6 is subject to narrow band light pulse irradiation, gas molecule is by its characteristic absorption frequency absorption optical radiation, gas absorption energy and the proportional relation of its concentration, and will to absorb energy Partial Conversion be heat energy, gas is periodically heated according to incident light pulse, and the cyclic fluctuation of gas temperature causes pressure surge; Wherein, according to HITRAN2008G molecular absorption spectrum database to SO2, the characteristic absorpting spectruming line of choosing after the absorption line of H2S and CO carefully analyzes is as follows: SO2 characteristic absorpting spectruming line wavelength 3.98um, H2S characteristic absorpting spectruming line wavelength 4.65um, CO characteristic absorpting spectruming line wavelength 2.64um.
(4) periodic pressure fluctuation detects by microphone 12, acoustic energy is transformed into electric signal by microphone 12, electric signal is passed to single-chip microcomputer 3 by signal after improving signal to noise ratio (S/N ratio) by phase-locked amplifying circuit 13, single-chip microcomputer 3 obtains detecting the concentration value of gas by analysis with after calculating, and finally shows by display screen.
Claims (9)
1. the SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy, comprise housing (1), housing (1) inside arranges single-chip microcomputer (3) and accessory circuit thereof, single-chip microcomputer (3) and accessory circuit thereof connect power supply (5), it is characterized in that: single-chip microcomputer (3) connects infrared light supply (2) by power switch pipe (4), infrared light supply (2) is relative with the light source entrance port (8) of photoacoustic cell (6), photoacoustic cell (6) inside arranges resonator cavity (11), photoacoustic cell (6) both sides arrange the circular port (7) communicating with resonator cavity (11), microphone (12) is installed in the circular port (7) of both sides, microphone (12) connects single-chip microcomputer (3) by phase-locked amplifying circuit (13), single-chip microcomputer (3) connects display screen, photoacoustic cell (6) upper end arranges the air intake opening (15) and gas outlet (16) that communicate with resonator cavity (11).
2. the SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy according to claim 1, it is characterized in that: described photoacoustic cell (6) one end arranges incident mirror (14), incident mirror (14) is arranged on light source entrance port (8) and locates, the other end arranges catoptron (18), and incident mirror (14) and catoptron (18) are fixed on the two ends of photoacoustic cell (6) by pressure ring (10).
3. the SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy according to claim 2, it is characterized in that: between described incident mirror (14) and catoptron (18), form resonator cavity (18), resonator cavity (11) two ends arrange surge chamber (17).
4. the SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy according to claim 1, is characterized in that: described infrared light supply (2) adopts infrared filament, infrared light supply (2) front end arranges optical filter (9).
5. the SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy according to claim 1, is characterized in that: described microphone (12) adopts silicon microphone.
6. the SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy according to claim 1, is characterized in that: described single-chip microcomputer (3) adopts PIC16C74 single-chip microcomputer.
7. the SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy according to claim 1, is characterized in that: described power supply (5) adopts ferric phosphate lithium cell.
8. the SF6 gas decomposition product pick-up unit based on optoacoustic spectroscopy according to claim 1, is characterized in that: described housing (1) adopts ABS resin.
9. the SF6 gas decomposition product detection method based on optoacoustic spectroscopy, is characterized in that comprising the following steps:
(1) gas to be detected enters into by the air intake opening (15) of photoacoustic cell (6) in the resonator cavity (11) of photoacoustic cell (6);
(2) opening power (5), single-chip microcomputer (3) and accessory circuit thereof, power switch pipe (4), infrared light supply (2), phase-locked amplifying circuit (13) and display screen energising, single-chip microcomputer (3) carries out SPWM modulation to the switching drive signal of output, by infrared light supply access power switching tube loop, with SPWM signal driver power switch pipe, by power switch pipe, infrared light supply (2) is carried out to electronics modulation, after electronics modulation, infrared light intensity is cyclical variation, after mating plate filters after filtration, obtains the spectrum of characteristic frequency wavelength;
(3) spectrum of the characteristic frequency wavelength obtaining enters in photoacoustic cell (6) by light source entrance port (8), gas to be detected in photoacoustic cell (6) is subject to narrow band light pulse irradiation, gas molecule is by its characteristic absorption frequency absorption optical radiation, gas absorption energy and the proportional relation of its concentration, and will to absorb energy Partial Conversion be heat energy, gas is periodically heated according to incident light pulse, and the cyclic fluctuation of gas temperature causes pressure surge;
(4) periodic pressure fluctuation detects by microphone (12), acoustic energy is transformed into electric signal by microphone (12), electric signal is passed to single-chip microcomputer (3) by signal after improving signal to noise ratio (S/N ratio) by phase-locked amplifying circuit (13), single-chip microcomputer (3) obtains detecting the concentration value of gas by analysis with after calculating, and finally shows by display screen.
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| CN104198427A (en) * | 2014-09-09 | 2014-12-10 | 中国科学院电工研究所 | Photo-acoustic spectrometry detection device utilizing radial structure |
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| CN106198396A (en) * | 2016-08-01 | 2016-12-07 | 莆田学院 | A kind of SF 6 high-voltage detecting system |
| CN107807170A (en) * | 2017-10-20 | 2018-03-16 | 国网重庆市电力公司电力科学研究院 | The acoustic line model of one-dimensional longitudinal resonator of sulfur hexafluoride decomposition product detection |
| CN108489907A (en) * | 2018-04-10 | 2018-09-04 | 中国科学院合肥物质科学研究院 | A kind of ammonia detection device and method |
| CN108732104A (en) * | 2018-04-18 | 2018-11-02 | 中国科学院合肥物质科学研究院 | A kind of photo-acoustic spectrometer on-line measuring device |
| CN109490210A (en) * | 2018-11-16 | 2019-03-19 | 安徽理工大学 | A kind of audio frequency adjustable acoustic pressure enhanced photo acoustic pond |
| CN110208205A (en) * | 2019-06-03 | 2019-09-06 | 南京工业大学 | Photoacoustic spectrometer device based on photoacoustic cell mechanism |
| CN111122445A (en) * | 2018-11-01 | 2020-05-08 | 西安电子科技大学 | Multiple resonance type T-shaped enhanced simultaneous detection method for multiple trace gases |
| CN111122444A (en) * | 2018-11-01 | 2020-05-08 | 西安电子科技大学 | Multiple resonant T-shaped enhanced multiple trace gas simultaneous detection device |
| CN112504967A (en) * | 2020-12-09 | 2021-03-16 | 之江实验室 | Silicon tuning fork enhanced photoacoustic spectroscopy gas detection system |
| CN112504966A (en) * | 2020-12-09 | 2021-03-16 | 之江实验室 | Silicon tuning fork microphone for photoacoustic spectrum detection |
| CN114002158A (en) * | 2021-12-10 | 2022-02-01 | 国网江苏省电力有限公司检修分公司 | Method and device for detecting SF6 decomposition component gas based on photoacoustic spectrometry |
| CN115656040A (en) * | 2022-10-11 | 2023-01-31 | 国网湖北省电力有限公司电力科学研究院 | Anti-vibration SF6 gas decomposition product detection device |
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| CN104198427A (en) * | 2014-09-09 | 2014-12-10 | 中国科学院电工研究所 | Photo-acoustic spectrometry detection device utilizing radial structure |
| CN105988068A (en) * | 2016-07-15 | 2016-10-05 | 国网江苏省电力公司检修分公司 | Fault detection device for GIS equipment in high-voltage power transmission and transformation power station |
| CN106198396A (en) * | 2016-08-01 | 2016-12-07 | 莆田学院 | A kind of SF 6 high-voltage detecting system |
| CN106198396B (en) * | 2016-08-01 | 2019-10-22 | 莆田学院 | A kind of SF 6 high-voltage detection system |
| CN107807170A (en) * | 2017-10-20 | 2018-03-16 | 国网重庆市电力公司电力科学研究院 | The acoustic line model of one-dimensional longitudinal resonator of sulfur hexafluoride decomposition product detection |
| CN108489907A (en) * | 2018-04-10 | 2018-09-04 | 中国科学院合肥物质科学研究院 | A kind of ammonia detection device and method |
| CN108732104A (en) * | 2018-04-18 | 2018-11-02 | 中国科学院合肥物质科学研究院 | A kind of photo-acoustic spectrometer on-line measuring device |
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| CN111122444A (en) * | 2018-11-01 | 2020-05-08 | 西安电子科技大学 | Multiple resonant T-shaped enhanced multiple trace gas simultaneous detection device |
| CN111122445A (en) * | 2018-11-01 | 2020-05-08 | 西安电子科技大学 | Multiple resonance type T-shaped enhanced simultaneous detection method for multiple trace gases |
| CN109490210A (en) * | 2018-11-16 | 2019-03-19 | 安徽理工大学 | A kind of audio frequency adjustable acoustic pressure enhanced photo acoustic pond |
| CN110208205A (en) * | 2019-06-03 | 2019-09-06 | 南京工业大学 | Photoacoustic spectrometer device based on photoacoustic cell mechanism |
| CN112504967A (en) * | 2020-12-09 | 2021-03-16 | 之江实验室 | Silicon tuning fork enhanced photoacoustic spectroscopy gas detection system |
| CN112504966A (en) * | 2020-12-09 | 2021-03-16 | 之江实验室 | Silicon tuning fork microphone for photoacoustic spectrum detection |
| CN112504967B (en) * | 2020-12-09 | 2024-04-12 | 之江实验室 | Silicon tuning fork enhanced photoacoustic spectrum gas detection system |
| CN112504966B (en) * | 2020-12-09 | 2024-04-12 | 之江实验室 | Silicon tuning fork microphone for photoacoustic spectrum detection |
| CN114002158A (en) * | 2021-12-10 | 2022-02-01 | 国网江苏省电力有限公司检修分公司 | Method and device for detecting SF6 decomposition component gas based on photoacoustic spectrometry |
| CN115656040A (en) * | 2022-10-11 | 2023-01-31 | 国网湖北省电力有限公司电力科学研究院 | Anti-vibration SF6 gas decomposition product detection device |
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Application publication date: 20140625 |