CN1851447A - High-sensistive SF6 large-range monitoring instrument based on laser spectrum method - Google Patents
High-sensistive SF6 large-range monitoring instrument based on laser spectrum method Download PDFInfo
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- CN1851447A CN1851447A CN 200610040630 CN200610040630A CN1851447A CN 1851447 A CN1851447 A CN 1851447A CN 200610040630 CN200610040630 CN 200610040630 CN 200610040630 A CN200610040630 A CN 200610040630A CN 1851447 A CN1851447 A CN 1851447A
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Abstract
The invention discloses a high sensitive SF6 large scale monitoring device based on laser spectral method that includes casing, power supply plug base, switch, and data process module. The feature is that CO2 laser, power supply, and condensate system are installed on the bottom surface of casing, and reflector is installed at the front of light outlet of the laser. In the light path of reflecting the laser from CO2 laser, a chopper is installed, the laser beam would reach to the laser original intension detector. In the light path of reflecting the laser by metal film, a light intension detector is installed. The invention realizes high accuracy, quantification, and long useful life SF6 continuously online monitoring.
Description
Technical field
The invention belongs to a kind of laser surveying instrument of gas, specifically is a kind of highly sensitive SF6 based on laser spectrometry monitoring instrument on a large scale.
Background technology
Sulfur hexafluoride is a kind of almost completely material of insulation.This invisible gas is inertia, nontoxic, non-flammable, and density is bigger 5 times than air.Since the unique combination of its chemistry and physical characteristics, SF
6Be suitable for several professional purpose.Its main application is as combined electrical apparatus (GIS), and the high-voltage electrical apparatus switch comprises a kind of insulating gas of isolating switch.But because SF
6Decompose meeting and produce noxious material, as: fluoridize thionyl, sulphuric dioxide and SF4, SF2, F2, HF etc. are when the workman can cause poisoning when the occasion that exists this gas to leak is worked.Therefore monitor SF
6Leakage also be absolutely necessary for staff's safety.
SF
6Or a kind of very important greenhouse gases, because it can absorb infrared energy effectively at some wavelength, and its life-span is very long, and (prediction is estimated to be about 3200.Climate change expert group of official estimates, SF
6The potential energy of global warming factor is compared, possibly than CO by per molecule
2This greenhouse gases potential energy that mainly concentrates on the atmosphere middle level is big more than 23900 times.On capital of a country high-level meeting in 1997, SF
6Be that 6 kinds of conducts reduce one of greenhouse gases type of discharging.On the basis of the potential possibility of global warming,, point out to SF in 2012 by the greenhouse gases analyses that the U.S. made and had other more than 150 country's agreements
6Gas will account for greenhouse gases and reduce 14% of discharging composition.
Operation of power networks rules regulation all must detect the density and the water cut of SF6 gas with in service before equipment puts into operation.Along with science and technology development, in power industry, at present the monitoring method of existing some equipment at the monitoring of the SF6 gas-condition in the SF6 electric equipment on the domestic and international market adopts traditional chemical sensor mode to monitor SF6 concentration substantially.
At present, domestic SF6 gas-monitoring majority is based on the point measurement of electrochemical sensor, because therefore the shortcomings such as interference that electrochemical sensor generally has poor stability, easily poisons and can't avoid other gas have carried out the research based on the SF6 gas Leak Detection of laser spectrometry both at home and abroad.
Summary of the invention
The present invention proposes a kind of highly sensitive SF6 based on laser spectrometry monitor on a large scale, utilize SF6 10.5 and 10.6um near strong absorption line wavelength overlap this characteristic with P (16) and P (18) laser line of CO2, realize the glitch-free high-sensitivity measurement of SF6.
The technical solution of the utility model is as follows:
Based on the highly sensitive SF6 of laser spectrometry monitor on a large scale, include cabinet, supply socket is installed on the cabinet, and close, data processing module is installed in the cabinet, it is characterized in that being equipped with on the cabinet bottom surface carbon dioxide laser and power supply thereof, condensate system, condensate system includes water tank, water pump, pressure valve, the condensate water circulation pipe, before the light-emitting window of carbon dioxide laser catoptron is installed, at laser that carbon dioxide laser sends in the light path of this mirror reflects, a motor-driven chopper is installed, chopper is the rotating disk of a surperficial metal-plated membrane, and is jagged on the rotating disk, the breach ejaculator on the laser beam process rotating disk of mirror reflects, pass through the light-emitting window on the cabinet again, arrive and be installed in the original light intensity detector reception of the outer laser of cabinet; In the light path after the metal film reflection of laser beam on rotating disk of mirror reflects, light intensity detector is installed, on the cabinet sidewall vent port is arranged, vent port one side is equipped with heating radiator and fan.
In the described breach and the light path between the light hole on the cabinet on the laser beam process rotating disk of mirror reflects, a rotary catoptron is installed, this mirror mirror below is equipped with semiconductor laser, when this catoptron turns to and is miter angle with light path, be the light-emitting window of semiconductor laser under its two the intersection.
Described laser power supply one side is equipped with fan.
Described light intensity detector is a pyroelectric detector.
The present invention utilizes up-to-date mid-infrared laser absorption spectrum technology and open light path measurement to combine and realizes SF6 concentration in the large-scale surrounding air is carried out real-time telemetry, eliminate the interference of other gas (especially water vapor and carbon dioxide) in the surrounding air, reached the on-the-spot monitoring in real time that is lower than the ppm magnitude.From technical method overcome the sensitivity of traditional monitoring low, be subject to disturb, can not realize shortcoming such as continuous real-time monitoring and cost height on a large scale, really accomplished high precision (1ppm variation), quantification, long-life, large-area real time on-line monitoring.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the chopper structural representation.
Embodiment
Referring to Fig. 1, Fig. 2.
Number in the figure: 1, cabinet, 2, carbon dioxide laser, 3, digital sampling and processing, 4, water tank, 5, water pump, 6, pressure switch, 7, laser power supply switch, 8, the laser diode current adjusting knob, 9, the laser cooling water circulation pipe, 10, catoptron, 11, laser diode current table, 12, detector, 13, chopper, 14, rotatable catoptron, 15, fan, 16, the laser power supply module, 17, the 650nm semiconductor laser, 18, light-emitting window, 19, fan, 20, exhausr port, 21, heat radiator, 22, general supply socket, 23, detector.Above-mentioned related parts (except the detector 23) all are mounted on the cabinet 1.
As light source, in order to reduce the volume of instrument, the laser tube that 350mm is long becomes to be similar to 45 degree and is placed in the instrument cabinet 1 the utility model with the carbon dioxide laser 2 of wavelength 10.6um.In laser instrument light-emitting window front a catoptron 10 is installed, the direction that changes laser instrument output laser is a horizontal direction.Utilize chopper 13 copped waves then, chopper 13 as shown in Figure 2, chopper 13 is metal-plated membrane rotating disks, and by motor-driven, to be laser be transferred to the SF6 that is installed on the outer detector 23 of instrument in the environment to external world by the breach on the chopper, light-emitting window 18 measures for the breach that bright dipping is arranged on the rotating disk, chopper 13.Reflection arrives detector 12 when the metal-coated membrane position of rotating disk is arrived in laser radiation, and detector 12 is used to monitor the variation of laser intensity.Catoptron 14 is rotatably installed in the cabinet, can turn to the direction of exporting with the laser of carbon dioxide laser (level) and become miter angle, combine with red light semiconductor laser 17 realize light path regulatory function, the light-emitting window of semiconductor laser 17 be positioned at catoptron 14 and horizontal direction the infrared light path of laser intersection under; Promptly, when the red laser that catoptron 14 turns to semiconductor laser sends becomes 45 to spend, laser by red light semiconductor laser 17 outputs is just in time spent incident for 14 one-tenth 45 with catoptron, vertical with incident beam after catoptron 14 reflections, with the coaxial output of infrared laser of carbon dioxide laser 2 outputs; Therefore just the installation light path of system can be regulated by visible light.The high-voltage power module 16 of carbon dioxide laser is for carbon dioxide laser 2 provides instantaneous pressure and stable working current.Fan 15 provides cooling for power module 16.Diameter is the light-emitting window 18 of 20mm, and infrared laser is outgoing thus.The heat radiator 21 of laser instrument cooling circulating water, be positioned at the exhausr port next door on cabinet 1 sidewall, its opposite side is equipped with fan 19, will distribute from the heat the circulating condensing water that laser instrument 2 comes out, the temperature that guarantees circulating condensing water is in room temperature, thus the operate as normal of assurance laser instrument 2.The outlet 22 of instrument.In order to guarantee the operate as normal of laser instrument 2, laser instrument 2 is circumscribed with the condensate system of water tank 4, water pump 5, pressure switch 6, laser cooling water circulation pipe 9 formations, water tank 4 is diameter 100mm, the poly-tetrafluoro bucket of high 200mm, be used to store chilled water, water pump 5 is that a flow is 5L/min, and lift is the flow pump of 1m, is used for controlling the circulation of chilled water; Pressure switch 6 is pressure transducer and pressure switches of a corrugated tube, be used for monitoring the circulation and the control Laser Power Devices of water, have only in chilled water circulation pipe 9 enough chilled waters are arranged, and during the flow pump operate as normal, water pressure is impelled bellows expansion, and the corrugated tube elongation is the squeeze pressure switch afterwards, just connects the power supply of laser instrument, guarantee thus only under the normal situation of water cycle, can open the laser instrument operate as normal, avoid because the water cycle fault causes laser instrument to burn out.
The laser of carbon dioxide laser 2 outputs is through receiving through detector 23 after the measured zone, and detector 12,23 is pyroelectric detector, and sensitivity is 20mv/mJ.Compare according to detector 12 (the original light intensity of laser) and detector 23 (light intensity after the gas absorption) signal, by the demarcation of variable concentrations gas, can obtain the SF6 gas concentration between measurement zone again.Detection sensitivity is lower than 1ppm.m.
Measuring process:
Length is that the laser of 10.6um wavelength of commercial carbon dioxide laser output of 350m is through catoptron 10 reflections (level crossing of aluminizing of diameter 20mm), cut into pulsed light beam by chopper 13, wherein chopper as shown in Figure 2, process by corrosion resistant plate, to pass chopper when light beam irradiates during to the T part, the chopper external diameter is 100mm, and internal diameter is 80mm, each projection and reflecting part account for 60 ° respectively, and chopper is by the driven by motor of 5V direct current input; The laser of transmission is through arriving detector 23 (commercial pyroelectric detector) behind the space to be measured; When arriving the R part, light beam irradiates arrived detector 12 by the surface reflection of corrosion resistant plate.
The light path regulating branch: the 17th, wavelength is 650nm, output power is the semiconductor laser of 10mW, through rotatable catoptron 14 (commercialization) reflection, make visible light and infrared laser coaxial by adjusting, thereby the light path when realizing long-range detection is regulated to the laser emitting direction.
Signal Processing: the signal that detector 12 obtains is the original laser light intensity I when reacting not by gas absorption
0, the signal of detector 23 outputs is the laser intensity I through gas absorption to be measured, just can obtain measuring the uptake of the SF6 gas generation in the light path through the comparison of two signals.
Material has different absorptions to the electromagnetic wave of different frequency, when a branch of light intensity is I
0Directional light be the absorbing medium of L by length after, the intensity that records at receiving end is I, follows the Beer-Lambert absorption law:
I (v)=I
0(υ) exp (c σ (υ) L) absorption coefficient can obtain by the HITTRAN database, the measurement light path length L substitution following formula of the two paths of signals that measures and system just can be obtained the concentration C of gas.
Claims (4)
1, based on the highly sensitive SF6 of laser spectrometry monitor on a large scale, include cabinet, supply socket is installed on the cabinet, and close, data processing module is installed in the cabinet, it is characterized in that being equipped with on the cabinet bottom surface carbon dioxide laser and power supply thereof, condensate system, condensate system includes water tank, water pump, pressure valve, the condensate water circulation pipe, before the light-emitting window of carbon dioxide laser catoptron is installed, at laser that carbon dioxide laser sends in the light path of this mirror reflects, a motor-driven chopper is installed, chopper is the rotating disk of a surperficial metal-plated membrane, and is jagged on the rotating disk, the breach ejaculator on the laser beam process rotating disk of mirror reflects, pass through the light-emitting window on the cabinet again, arrive and be installed in the original light intensity detector reception of the outer laser of cabinet; In the light path after the metal film reflection of laser beam on rotating disk of mirror reflects, light intensity detector is installed, on the cabinet sidewall vent port is arranged, vent port one side is equipped with heating radiator and fan.
2, monitor according to claim 1, it is characterized in that in the described breach and the light path between the light hole on the cabinet on the laser beam process rotating disk of mirror reflects, a rotary catoptron is installed, this mirror mirror below is equipped with semiconductor laser, when this catoptron turns to and is miter angle with light path, be the light-emitting window of semiconductor laser under its two the intersection.
3, monitor according to claim 1 is characterized in that described laser power supply one side is equipped with fan.
4, monitor according to claim 1 is characterized in that described light intensity detector is a pyroelectric detector.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100406307A CN100470236C (en) | 2006-05-18 | 2006-05-18 | High-sensistive SF6 large-range monitoring instrument based on laser spectrum method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100406307A CN100470236C (en) | 2006-05-18 | 2006-05-18 | High-sensistive SF6 large-range monitoring instrument based on laser spectrum method |
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| CN1851447A true CN1851447A (en) | 2006-10-25 |
| CN100470236C CN100470236C (en) | 2009-03-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013053163A1 (en) * | 2011-10-09 | 2013-04-18 | 重庆市电力公司电力科学研究院 | Holographic detection device and method for gas content in gis switch |
| CN103776774A (en) * | 2014-01-21 | 2014-05-07 | 南京顺泰科技有限公司 | Sulfur hexafluoride gas sampling spectrum detection device |
| CN103792206A (en) * | 2014-03-12 | 2014-05-14 | 重庆大学 | Built-in infrared gas sensor for online detecting SF6 decomposition components in GIS |
| CN107389622A (en) * | 2017-06-28 | 2017-11-24 | 广东省特种设备检测研究院茂名检测院 | A kind of optics cavity for being used to measure natural gas transmitted spectrum |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3504140A1 (en) * | 1985-02-07 | 1986-08-07 | Hartmann & Braun Ag, 6000 Frankfurt | ROTATING MODULATION DEVICE |
| DE19911260A1 (en) * | 1999-03-13 | 2000-09-14 | Leybold Vakuum Gmbh | Infrared gas analyzer and method for operating this analyzer |
| CN1664563A (en) * | 2004-12-31 | 2005-09-07 | 合肥东能光电科技有限公司 | Process for detecting sulfur hexafluoride (SF6) gas |
| CN2773672Y (en) * | 2005-02-17 | 2006-04-19 | 常州市锐高工业检测设备有限公司 | Optical detector of sulfur hexafluoride gas concentration |
-
2006
- 2006-05-18 CN CNB2006100406307A patent/CN100470236C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013053163A1 (en) * | 2011-10-09 | 2013-04-18 | 重庆市电力公司电力科学研究院 | Holographic detection device and method for gas content in gis switch |
| US9188575B2 (en) | 2011-10-09 | 2015-11-17 | Chongqing Electric Power Research Institute | Holographic detection device and method for content of gas in GIS switch |
| CN103776774A (en) * | 2014-01-21 | 2014-05-07 | 南京顺泰科技有限公司 | Sulfur hexafluoride gas sampling spectrum detection device |
| CN103776774B (en) * | 2014-01-21 | 2016-08-17 | 南京顺泰科技有限公司 | A kind of sulfur hexafluoride gas sampling spectrum detection device |
| CN103792206A (en) * | 2014-03-12 | 2014-05-14 | 重庆大学 | Built-in infrared gas sensor for online detecting SF6 decomposition components in GIS |
| CN103792206B (en) * | 2014-03-12 | 2016-07-13 | 重庆大学 | SF in on-line checking GIS6The built-in infrared gas sensor of decomposition components |
| CN107389622A (en) * | 2017-06-28 | 2017-11-24 | 广东省特种设备检测研究院茂名检测院 | A kind of optics cavity for being used to measure natural gas transmitted spectrum |
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| CN100470236C (en) | 2009-03-18 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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Application publication date: 20061025 Assignee: Nanjing Shuntai Technology Co., Ltd. Assignor: Anhui Institute of Optics and fine mechanics, Chinese Academy of Sciences Contract record no.: 2010320000350 Denomination of invention: High-sensistive SF6 large-range monitoring instrument based on laser spectrum method Granted publication date: 20090318 License type: Exclusive License Record date: 20100402 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090318 Termination date: 20180518 |