CN102445433B - SF6 decomposition gas infrared spectrum multi-component detection method and device - Google Patents
SF6 decomposition gas infrared spectrum multi-component detection method and device Download PDFInfo
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- CN102445433B CN102445433B CN 201110440654 CN201110440654A CN102445433B CN 102445433 B CN102445433 B CN 102445433B CN 201110440654 CN201110440654 CN 201110440654 CN 201110440654 A CN201110440654 A CN 201110440654A CN 102445433 B CN102445433 B CN 102445433B
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Abstract
The invention discloses an SF6 decomposition gas infrared spectrum multi-component detection method and a device. According to the method, a chopped wave modulation wheel and a spectroscopical filtration wheel in a traditional non-dispersion infrared spectrum technology are combined into a whole, a modulation filtration wheel is utilized to realize simultaneous measurement of multi-component gas,and a long path multiple reflection absorption technology is combined simultaneously to increase detection sensitivity. The device comprises an optics unit, a gas circuit unit and an electronics unitarranged in a main machine box. The SF6 decomposition gas infrared spectrum multi-component detection method and the device are suitable for electrical equipment fault monitoring and diagnosing in anelectrical system with SF6 gas being an insulation and arc extinction medium. On-line gas concentration measurement with high speed, high sensitivity and non-interference is realized.
Description
Technical field
The invention belongs to a kind of infrared spectrometry method and instrument of gas, specifically is a kind of SF based on the gas infrared absorption spectrum
6Decomposition gas measuring method and device.
Background technology
SF
6Because its superior insulation, arc-extinguishing medium are widely used in the high voltage electric equipment.Along with developing rapidly of domestic power industry, from eighties of last century after the eighties, SF
6Electrical equipment replaces traditional oil-filled electrical equipment gradually, for safety and stability, the economical operation of electric system obtains good effect.But because equipment has influenced the normal operation of equipment, even led to a disaster in some defective that aspects such as design, manufacturing, installation and operation maintenance exist, therefore in time detect SF
6The inside electric appliance defective has very important meaning to the safe operation of assurance equipment and electrical network.But diagnose SF in early days
6In the electrical equipment malfunction, it is unable to do what one wishes that traditional electrical test method but seems sometimes, and work as SF
6When electrical equipment breaks down, SF
6Gas can produce decomposition product SO
2, H
2Therefore S, CO etc. can come diagnostic device inside whether to have fault by the content of testing these gas decomposition products.Because the method is highly sensitive aspect fault diagnosis, accuracy is good, will become SF
6A kind of effective means of electrical equipment malfunction monitoring and diagnosis.
At present, for SF
6The analyzing detecting method of gas decomposition product total amount mainly contains: vapor-phase chromatography, detector tube method, decomposition product total amount detector method.At first, vapor-phase chromatography utilizes gas chromatograph can detect decomposition product, but owing to there is not the standard substance of decomposition product, causes chromatography to have certain limitation, can not carry out the work flexibly; In addition, after needing the collection in worksite sample to go back to the laboratory to carry out enrichment and handle, utilize chromatograph to carry out analyzing and testing, test process more complicated, loaded down with trivial details, simultaneously because decomposition product generally all has toxicity, in a single day gas takes place in the operating process leak bigger to experimenter's personal safety hazard ratio.The detector tube method is though can detect SO
2Deng material, but detected components is more single, can not reflect whole overview, and using has certain limitation.The total decomposition product content of decomposition product total amount detector in can analysis and test device, as long as Device memory just can detect at decomposition product, test job is carried out at this instrument scene, and is easy to use, can carry out summing up empirical data after the general survey, instruct produced on-site to use.But owing to can only obtain to decompose the data of total amount, do not have concrete component concentrations value, thereby be unfavorable for the analysis of fault type and character.
。Infra-red sepectrometry is to utilize gas molecule infrared absorption spectrum characteristic to carry out the spectral analysis technique that the gas composition qualitative, quantitative is measured, it can measure multiple gases, have that measurement range is wide, selectivity well, can not poisoning, long service life, low in energy consumption, be convenient to characteristics such as operation and maintenance, can realize the on-line measurement of gas composition, utilize infrared spectrum technology to carry out SF
6Decomposition product can effectively remedy the defective of traditional detection technology.
Summary of the invention
The present invention seeks to the traditional instrument that exists at prior art can only off-line measurement, single detected components, and sense cycle is long etc., and defective provides a kind of SF
6Decomposition gas infrared spectrometry method and apparatus.
The present invention adopts following technical scheme for achieving the above object:
SF of the present invention
6Decomposition gas infrared spectrum polycomponent detection method, it is characterized in that the continuous infrared waves of infrared light supply radiation, utilize filtering, copped wave dish to modulate and filtering, four light holes are arranged on filtering, the copped wave dish, be separately installed with centre wavelength on it and be respectively four arrowband intermediate infrared filters of 4.65um, 3.85 um, 7.35um, 7.85um, wherein 4.67um optical filter transmitted light detects light wave as CO gas, 3.85 um optical filter transmitted light detects reference light wave as CO gas, 7.35um optical filter transmitted light is as SO
2Gas detects light wave, and 7.85um optical filter transmitted light is as SF
6Gas detects reference light wave; Filtering, copped wave dish (23) are driven with uniform rotation by direct current synchronous motor, and continuous infrared waves is modulated to pulsed light, and corresponding CO gas detects, CO gas detects reference, SO
2Gas detects, SF
6Gas detect the reference light wave order by and be coupled into repeatedly reflection tank of long light path optics; Filtering, copped wave web are along being equipped with a light barrier, and the pulse signal that produces during light barrier process optocoupler triggers synchronously through aligning and the signal acquisition module that signal interface board is used for the optical filter sequential signal;
Infrared modulated light enters long light path optics and repeatedly reflects repeatedly reflection tank of long light path optics through repeatedly back and forth reflecting the back by the emergent light reflective mirror behind the reflection tank; The infra-red heat electric explorer will reflect long light path optics repeatedly the infrared modulation light signal of reflection tank be converted to electric signal and send prime amplifier, after prime amplifier amplifies electric signal through the signal wire number of delivering letters interface board; Signal interface board to electric signal carry out A/D conversion back by data acquisition, processing and control module at optocoupler) pulse signal that sends carries out digital signal acquiring, progressive mean, filtering under triggering and obtains detection signal and reference signal, described detection signal and reference signal are used to inverting CO and SF
6Gas concentration.
Also comprise the accurate method of sports school: described detection sample gas is entered by the fast interface of sample gas draft tube, enter long light path optical absorption pond by the air inlet gas circuit by air admission hole, a three-way solenoid valve and an one-way flow valves are arranged on the air inlet gas circuit, three-way solenoid valve is at a-b direction normal open, three-way solenoid valve is normally closed in the a-c direction, detects operation up-to-date style gas and circulates in the a-b direction;
The accurate method of described sports school adopts the calibrating gas calibration steps, ground background signal when at first measuring blank sample, high pure nitrogen is inserted the fast interface of calibration gas air inlet as blank sample, the c termination of calibration gas route three-way solenoid valve is gone into intake channel, three-way solenoid valve is converted to the conducting of a-c direction, treat that blank gas replaces and adopt the infra-red heat electric explorer to gather the spectral signal of each filtering wave band in the long light path optical absorption pond behind original gas that each component gas during the preservation blank gas is at the detection wave band with reference to wave band end of probe The Relationship of Light intensity signal as a setting; Then the concentration known calibrating gas is fed long light path optical absorption pond, treat to adopt the infra-red heat electric explorer to gather the spectral signal of each filtering wave band behind original gas in the long light path optical absorption of the normal concentration gas replacement pond, each component gas when preserving normal concentration gas detect wave band and with reference to wave band end of probe The Relationship of Light intensity as calibrating signal, carry out linearity by background signal and calibrating signal and fit and can obtain working curve; Three-way solenoid valve is converted to the conducting of a-b direction, and the conducting of sample gas gas circuit is carried out the gas detection and obtained detection signal, and the working curve that detection signal utilizes calibration process to obtain carries out automatic retrieving concentration, obtains the concentration measurement of each component gas.
Described calibrating gas is the single or multicomponent gas of concentration known.
SF
6Decomposition gas infrared spectrum pick-up unit, comprise mainframe box, the touch LCD display screen is installed on the mainframe box, supply socket, main power switch, the fast interface of sample gas escape pipe, the fast interface of sample gas draft tube, USB interface, 485 data communication interfaces and Ethernet interface, it is characterized in that also arranging in the mainframe box long light path optical absorption pond, the infra-red heat electric explorer, prime amplifier, pressure transducer, gas pump, the unidirectional electrical magnet valve, D.C. regulated power supply, communication circuit module, data acquisition, handle and control module, signal interface board, filtering, the copped wave dish, direct current synchronous motor, infrared light supply and optocoupler; Wherein the infra-red heat electric explorer detects the outgoing beam in long light path optical absorption pond, the output terminal of infra-red heat electric explorer is connected in series prime amplifier successively, signal interface board, data acquisition, processing and control module and communication circuit module, communication circuit module carries out data transmission with 485 data communication interfaces and Ethernet interface respectively, the fast interface of sample gas draft tube enters long light path optical absorption pond after being connected in series one-way flow valves by the air inlet gas circuit, sample gas in the long light path optical absorption pond is extracted out through the gas circuit of giving vent to anger by gas pump, on the gas circuit of giving vent to anger pressure transducer is installed, pressure transducer links to each other with signal interface board by cable, the feedback end order of pressure transducer is to solenoid valve, the emergent ray of infrared light supply is through filtering, the copped wave dish enters long light path optical absorption pond, with filtering, copped wave dish correspondence arranges optocoupler, direct current synchronous motor, infrared light supply is connected with signal interface board respectively with optocoupler, direct current synchronous motor control filtering, the action of copped wave dish, D.C. regulated power supply is used for providing direct supply.
Described long light path optical absorption pond is by the primary mirror that is arranged in the seal closure of optical absorption pond, secondary mirror one, secondary mirror two, incident light reflective mirror and emergent light reflective mirror are formed, one side of described optical absorption pond seal closure sets out pore and outgoing optics window respectively, the opposite side of described optical absorption pond seal closure arranges air admission hole and beam incident optical window respectively, emergent light reflective mirror and the corresponding setting of outgoing optics window, the corresponding setting with the beam incident optical window of incident light reflective mirror, primary mirror respectively with secondary mirror one and secondary mirror two relative settings, primary mirror side at optical absorption pond seal closure is installed well heater one, secondary mirror one and secondary mirror two sides at optical absorption pond seal closure are installed well heater two, on the seal closure of optical absorption pond temperature sensor is set also, temperature sensor is connected with signal interface board.
Be equipped with on described filtering, the copped wave dish that CO detects optical filter, CO detects with reference to optical filter, SO
2Detect optical filter, SO
2Detection is with reference to optical filter, and filtering, copped wave web are along light barrier is installed.
Described infrared light supply adopts Globar heating element.
On the described gas circuit of giving vent to anger galvanochemistry H is installed
2The S sensor, galvanochemistry H
2The S sensor links to each other with signal interface board by cable.
The fast interface of calibration gas air inlet also is set on the described mainframe box, also be connected in series three-way solenoid valve between the fast interface of described sample gas draft tube and the one-way flow valves, three-way solenoid valve is at a-b direction normal open, three-way solenoid valve is normally closed in the a-c direction, and the c end of three-way solenoid valve is connected with the fast interface of calibration gas air inlet.
Describedly go out the otpical leaf that incident optical window sheet is made for the fluorite material.
The present invention proposes a kind of SF based on the non-dispersion infrared spectrometry
6TYPICAL DECOMPOSITION product S O
2, the highly sensitive online test method of CO and device, chopping modulation in traditional non-disperse infrared spectrum technology is taken turns the innovative approach that unites two into one with the light splitting filter wheel, measure when utilizing a modulated filter wheel to realize multicomponent gas, the long light path of while combination repeatedly reflection-absorption technology increases detection sensitivity.Internal system is integrated H
2The S electrochemical sensor is realized H
2Measure in the time of the S gas component concentrations, to satisfy the needs of electrical equipment fault monitoring and diagnosis.Be suitable for SF6 gas serves as insulation and arc-extinguishing medium in the electric system electrical equipment malfunction monitoring and diagnosis.
The present invention realizes quick, highly sensitive, glitch-free online gas concentration measurement.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is filtering, copped wave dish structural representation;
Fig. 3 is long light path optical absorption pool structure synoptic diagram.
Number in the figure: 1, mainframe box, 2, the touch LCD display screen, 3, main power switch, 4, long light path optical absorption pond, 5, the infra-red heat electric explorer, 6, prime amplifier 7, galvanochemistry H2S gas sensor, 8, pressure transducer, 9, gas pump, 10, the fast interface of sample gas escape pipe, 11, the unidirectional electrical magnet valve, 12, three-way solenoid valve, 13, the fast interface of sample gas draft tube, 14, the fast interface of calibration gas air inlet, 15, USB interface, 16,485 data communication interfaces, 17, Ethernet interface, 18, exchange the general supply socket, 19, D.C. regulated power supply, 20, communication circuit module, 21, data acquisition, handle and control module, 22, signal interface board, 23, filtering, the copped wave dish, 24, direct current synchronous motor, 25, infrared light supply, 26, optocoupler, 27, CO detects optical filter, 28, CO detects with reference to optical filter, and 29, SO
2Detect optical filter, 30, SO
2Detection is with reference to optical filter, and 31, light barrier, 32, primary mirror, 33, optical absorption pond seal closure, 34, well heater one, 35, incident light reflective mirror, 36, beam incident optical window, 37, temperature sensor, 38, air admission hole, 39, secondary mirror one, 40, well heater two, 41, secondary mirror two, 42, emergent light reflective mirror, 43, outgoing optics window, 44, venthole.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
As shown in Figure 1, SF
6Decomposition gas infrared spectrum pick-up unit, comprise mainframe box 1, touch LCD display screen 2 is installed on the mainframe box 1, supply socket 18, main power switch 3, the fast interface 10 of sample gas escape pipe, the fast interface 13 of sample gas draft tube, usb 15,485 data communication interfaces 16 and Ethernet interface 17, it is characterized in that also arranging in the mainframe box 1 long light path optical absorption pond 4, infra-red heat electric explorer (5), prime amplifier 6, pressure transducer 8, gas pump 9, unidirectional electrical magnet valve 11, D.C. regulated power supply 19, communication circuit module 20, data acquisition, handle and control module 21, signal interface board 22, filtering, copped wave dish 23, direct current synchronous motor 24, infrared light supply 25 and optocoupler 26; Wherein infra-red heat electric explorer 5 detects the outgoing beam in long light path optical absorption pond 4, the output terminal of infra-red heat electric explorer 5 is connected in series prime amplifier 6 successively, signal interface board 22, data acquisition, handle and control module 21 and communication circuit module 20, communication circuit module 20 carries out data transmission with 485 data communication interfaces 16 and Ethernet interface 17 respectively, the fast interface 13 of sample gas draft tube enters long light path optical absorption pond 4 after being connected in series one-way flow valves 11 by the air inlet gas circuit, sample gas in the long light path optical absorption pond 4 is extracted out through the gas circuit of giving vent to anger by gas pump 9, pressure transducer 8 is installed on the gas circuit of giving vent to anger, pressure transducer 8 links to each other with signal interface board 22 by cable, the feedback end order of pressure transducer 8 is to solenoid valve 11, the emergent ray of infrared light supply 25 is through filtering, copped wave dish 23 enters long light path optical absorption pond 4, with filtering, copped wave dish 23 correspondences arrange optocoupler 26, direct current synchronous motor 24, infrared light supply 25 is connected with signal interface board 22 respectively with optocoupler 26, direct current synchronous motor 24 control filtering, 23 actions of copped wave dish, D.C. regulated power supply 19 is used for providing direct supply.
Show as Fig. 3, described long light path optical absorption pond 4 is by the primary mirror 32 that is arranged in the optical absorption pond seal closure 33, secondary mirror 1, secondary mirror 2 41, incident light reflective mirror 35 and emergent light reflective mirror 42 are formed, one side of described optical absorption pond seal closure 33 sets out pore 44 and outgoing optics window 43 respectively, the opposite side of described optical absorption pond seal closure 33 arranges air admission hole 38 and beam incident optical window 36 respectively, emergent light reflective mirror 42 and the 43 corresponding settings of outgoing optics window, incident light reflective mirror 35 and the 36 corresponding settings of beam incident optical window, primary mirror 32 is oppositely arranged respectively with secondary mirror 1 and secondary mirror 2 41, primary mirror 32 sides at optical absorption pond seal closure 33 are installed well heater 1, secondary mirror 1 and secondary mirror 2 41 sides at optical absorption pond seal closure 33 are installed well heater 2 40, on the optical absorption pond seal closure 33 temperature sensor 37 is set also, temperature sensor 37 is connected with signal interface board 22.
As Fig. 2, be equipped with on described filtering, the copped wave dish 23 that CO detects optical filter 27, CO detects with reference to optical filter 28, SO
2Detect optical filter 29, SO
2Detection is with reference to optical filter 30, and filtering, copped wave dish 23 edges are equipped with light barrier 31.
Described infrared light supply 25 adopts Globar heating element.
On the described gas circuit of giving vent to anger galvanochemistry H is installed
2 S sensor 7, galvanochemistry H
2S sensor 7 links to each other with signal interface board 22 by cable.
The fast interface 14 of calibration gas air inlet also is set on the described mainframe box 1, also be connected in series three-way solenoid valve 12 between the fast interface 13 of described sample gas draft tube and the one-way flow valves 11, three-way solenoid valve 12 is at a-b direction normal open, three-way solenoid valve 12 is normally closed in the a-c direction, and the c end of three-way solenoid valve 12 is connected with the fast interface 14 of calibration gas air inlet.
Describedly go out the otpical leaf that incident optical window sheet 36 is made for the fluorite material.
When infrared light passed through gas to be measured, these gas molecules had absorption to the infrared light of specific wavelength, and it absorbs relation and obeys lambert--Bill (Lambert-Beer) absorption law.The non-disperse infrared spectrum technology generally adopts the continuous infrared light supply in broadband, utilize narrow band pass filter that light source is carried out filtering, obtain the arrowband light wave with object gas characteristic absorption and no absorption bands, it is absorption bands and with reference to the wave band light wave, by detecting by absorption bands behind the sample gas and relative variation with reference to the wave band light intensity, can the inverting gas concentration.Detection light source of the present invention adopts Globar heating element as infrared detection light source 25, the continuous infrared waves of radiation utilizes filtering, copped wave dish 23 to modulate and filtering, four light holes are arranged on filtering, the copped wave dish 23, be separately installed with centre wavelength on it and be respectively four arrowband intermediate infrared filters of 4.65um, 3.85 um, 7.35um, 7.85um, wherein 4.65um optical filter 27 transmitted lights detect light wave as CO gas, 3.85 um optical filter 28 transmitted lights detect reference light wave as CO gas, 7.35um optical filter 29 transmitted lights are as SO
2Gas detects light wave, and 7.85um optical filter 30 transmitted lights are as SF
6Gas detects reference light wave.Filtering, copped wave dish 23 are driven with uniform rotation by direct current synchronous motor 24, and continuous infrared waves is modulated to pulsed light, and corresponding CO gas detects, CO gas detects reference, SO
2Gas detects, SF
6Gas detects reference light wave and is coupled into repeatedly reflection tank 4 of long light path optics in proper order; Filtering, copped wave dish 23 edges are equipped with a light barrier 31, the pulse signal number of the delivering letters interface board 22 that produces during light barrier process optocoupler 26, aligning and the signal acquisition module of sending data acquisition, processing and control module 21 to be used for the optical filter sequential signal again trigger synchronously.Be modulated to pulsed light and enter optical absorption pond 4 through beam incident optical window 36; the otpical leaf that beam incident optical window 36 is made for the fluorite material; because the long infrared of interfere type optical filter more than 9um has certain percent of pass usually, the optics window of employing fluorite material can be with the infrared band filtering more than the 9um in the infrared light supply.The optical absorption pond is that three lump cokes are apart from identical spherical mirror and two process particular design optical textures that catoptron is formed, infrared modulated light is at first reflexed on the secondary mirror 1 by incident light reflective mirror 35 after entering the optical absorption pond, secondary mirror 1 arrives primary mirror 32 with beam reflection, primary mirror 32 with beam reflection to secondary mirror 2 41, secondary mirror 2 32 again with beam reflection to primary mirror 32, primary mirror 32 again with beam reflection to secondary mirror 1, so circulation reflection, the flare of light beam on secondary mirror is overlapping, and the flare on primary mirror is that two row are tactic, like this through the light beam irradiates behind the interflection repeatedly to the emergent light reflective mirror 42 optics absorption cell that is reflected out; Shine on the photosurface of infra-red heat electric explorer 5 behind the outgoing optics window 43 of outgoing beam through optical absorption pond fluorite material, infra-red heat electric explorer 5 is converted to electric signal with light signal and send prime amplifier 6, after prime amplifier 6 amplifies signal through the signal wire number of delivering letters interface board 22.22 pairs of signals of signal interface board carry out A/D conversion back and carry out digital signal acquiring, progressive mean, filtering by data acquisition, processing and control module 21 under the pulse signal that optocoupler sends triggers, and detection signal and reference signal are used to the gas concentration of inverting CO and SF6 after treatment.The gas concentration data of CO and SF6 show at the touch LCD display screen on the one hand, send communication module 20 to carry out data transmission by 485 data communication interfaces 16 and Ethernet interface 17 on the one hand.
Detecting sample gas is entered by the fast interface 13 of sample gas draft tube, enter long light path optical absorption pond 4 by the air inlet gas circuit by air admission hole 38, a three-way solenoid valve 12 and an one-way flow valves 11 are arranged on the air inlet gas circuit, three-way solenoid valve 12 is at a-b direction normal open, normally closed in the a-c direction, detect operation up-to-date style gas and circulate in the a-b direction.Long light path optical absorption pond 4 is integral sealings, and the sample gas that enters long light path optical absorption pond 4 is extracted out through the gas circuit of giving vent to anger by gas pump 9, and barometer 8 and galvanochemistry H are installed on the gas circuit of giving vent to anger
2S sensor 7 is in order to measure the H in the sample gas simultaneously
2The S constituent concentration; Galvanochemistry H
2The S sensor links to each other with signal interface board 22 by cable, and gathers digital signal by data acquisition, processing and control module 21 and calculate H
2The S gas concentration.To measure in the gas circuits sample gas in real time strong for barometer 8 on the gas circuit of giving vent to anger, and air pressure feeds back to the one-way flow valves 11 on the air inlet gas circuit, thereby the air pressure in the gas circuit is remained near the atmospheric pressure.The two ends in optical absorption pond 4 are equipped with two well heaters primary mirror 32 and secondary mirror 39,41 are heated, prevent that steam in the sample gas is at the minute surface pollution minute surface that condenses, temperature sensor 37 is installed on the long light path optical absorption pond 4 in addition measures temperature in real time, and by signal interface board 22 control heaters, make optical absorption pond 4 temperature maintenance at 60 ℃.
System's retrieving concentration adopts the calibrating gas calibration steps, and system can calibrate by pure gas, also can calibrate simultaneously by multicomponent gas.A fast interface 14 of calibration gas air inlet is installed on the system host case rear panel, during system calibration, ground background signal when at first measuring blank sample, high pure nitrogen is inserted the fast interface 14 of calibration gas air inlet as blank sample, the c termination of calibration gas route three-way solenoid valve 12 is gone into intake channel, three-way solenoid valve 12 is automatically converted to the conducting of a-c direction under system software controls, treat that blank gas replaces the spectral signal of gathering each filtering wave band in the long light path optical absorption pond 4 behind original gases, each component gas when preserving blank gas is at the detection wave band with reference to wave band end of probe The Relationship of Light intensity signal as a setting; Then concentration known single component or polycomponent calibrating gas are fed long light path optical absorption pond 4, treat that normal concentration gas replaces the spectral signal of gathering each filtering wave band in the long light path optical absorption pond 4 behind original gas, each component gas when preserving normal concentration gas detect wave band and with reference to wave band end of probe The Relationship of Light intensity as calibrating signal, carry out the working curve that linearity fits the system that can obtain by background signal and calibrating signal.System calibration finishes the back and be transformed into sample gas detecting pattern under software control, and the conducting of sample gas gas circuit is carried out gas and detected, and the working curve that detection signal utilizes calibration process to obtain carries out automatic retrieving concentration, obtains the concentration measurement of each component gas.
Claims (2)
1. SF
6Decomposition gas infrared spectrum polycomponent detection method, it is characterized in that the continuous infrared waves of infrared light supply (25) radiation, utilize filtering, copped wave dish (23) to modulate and filtering, on filtering, the copped wave dish (23) four light holes are arranged, be separately installed with centre wavelength on it and be respectively four arrowband intermediate infrared filters of 4.65um, 3.85 um, 7.35um, 7.85um, wherein 4.67um optical filter transmitted light detects light wave as CO gas, 3.85 um optical filter transmitted light detects reference light wave as CO gas, 7.35um optical filter transmitted light is as SO
2Gas detects light wave, and 7.85um optical filter transmitted light is as SF
6Gas detects reference light wave; Filtering, copped wave dish (23) are driven with uniform rotation by direct current synchronous motor (24), and continuous infrared waves is modulated to pulsed light, and corresponding CO gas detects, CO gas detects reference, SO
2Gas detects, SF
6Gas detect the reference light wave order by and be coupled into repeatedly reflection tank (4) of long light path optics; Filtering, copped wave dish (23) edge are equipped with a light barrier (31), and the pulse signal that produces during light barrier process optocoupler (26) triggers synchronously through aligning and the signal acquisition module that signal interface board (22) is used for the optical filter sequential signal;
Described long light path optical absorption pond (4) is by the primary mirror (32) that is arranged in the optical absorption pond seal closure (33), secondary mirror one (39), secondary mirror two (41), incident light reflective mirror (35) and emergent light reflective mirror (42) are formed, one side of described optical absorption pond seal closure (33) sets out pore (44) and outgoing optics window (43) respectively, the opposite side of described optical absorption pond seal closure (33) arranges air admission hole (38) and beam incident optical window (36) respectively, emergent light reflective mirror (42) and the corresponding setting of outgoing optics window (43), incident light reflective mirror (35) and the corresponding setting of beam incident optical window (36), primary mirror (32) is oppositely arranged respectively with secondary mirror one (39) and secondary mirror two (41), primary mirror (32) side at optical absorption pond seal closure (33) is installed well heater one (34), secondary mirror one (39) and secondary mirror two (41) sides at optical absorption pond seal closure (33) are installed well heater two (40), temperature sensor (37) also is set on the optical absorption pond seal closure (33), and temperature sensor (37) is connected with signal interface board (22);
Infrared modulated light reflects long light path optical absorption pond (4) through repeatedly back and forth reflecting the back by emergent light reflective mirror (42) after entering long light path optical absorption pond (4); Infra-red heat electric explorer (5) will reflect long light path optics repeatedly the infrared modulation light signal of reflection tank (4) be converted to electric signal and send prime amplifier (6), after prime amplifier (6) amplifies electric signal through the signal wire number of delivering letters interface board (22); Signal interface board (22) carries out A/D conversion back to electric signal and carries out digital signal acquiring, progressive mean, filtering by data acquisition, processing and control module (21) under the pulse signal that optocoupler (26) sends triggers and obtain detection signal and reference signal, and described detection signal and reference signal are used to inverting CO and SF
6Gas concentration;
Long light path optical absorption pond is that three lump cokes are apart from identical spherical mirror and two optical textures that catoptron is formed, infrared modulated light is at first reflexed on the secondary mirror one (39) by incident light reflective mirror (35) after entering long light path optical absorption pond, secondary mirror one (39) arrives primary mirror (32) with beam reflection, primary mirror (32) arrives beam reflection on the secondary mirror two (41), secondary mirror two (32) arrives beam reflection on the primary mirror (32) again, and primary mirror (32) arrives beam reflection on the secondary mirror one (39) again;
Long light path optical absorption pond (4) is integral sealing, and the sample gas that enters long light path optical absorption pond (4) is extracted out through the gas circuit of giving vent to anger by gas pump (9), and barometer (8) and galvanochemistry H are installed on the gas circuit of giving vent to anger
2S sensor (7) is in order to measure the H in the sample gas simultaneously
2The S constituent concentration; Galvanochemistry H
2The S sensor links to each other with signal interface board (22) by cable, and gathers digital signal by data acquisition, processing and control module (21) and calculate H
2The S gas concentration;
Described detection method also comprises the accurate method of sports school: detect sample gas and entered by the fast interface of sample gas draft tube (13), enter long light path optical absorption pond (4) by the air inlet gas circuit by air admission hole (38), a three-way solenoid valve (12) and an one-way flow valves (11) are arranged on the air inlet gas circuit, three-way solenoid valve (12) is at a-b direction normal open, three-way solenoid valve (12) is normally closed in the a-c direction, detects operation up-to-date style gas and circulates in the a-b direction;
The accurate method of described sports school adopts the calibrating gas calibration steps, ground background signal when at first measuring blank sample, high pure nitrogen is inserted the fast interface of calibration gas air inlet (13) as blank sample, the c termination of calibration gas route three-way solenoid valve (12) is gone into intake channel, three-way solenoid valve (12) is converted to the conducting of a-c direction, treat that blank gas replaces and adopt infra-red heat electric explorer (5) to gather the spectral signal of each filtering wave band in the long light path optical absorption pond (4) behind original gas that each component gas when preserving blank gas is at the detection wave band with reference to wave band end of probe The Relationship of Light intensity signal as a setting; Then the concentration known calibrating gas is fed long light path optical absorption pond, treat to adopt infra-red heat electric explorer (5) to gather the spectral signal of each filtering wave band after normal concentration gas replaces the interior original gas in long light path optical absorption pond (4), each component gas when preserving normal concentration gas detect wave band and with reference to wave band end of probe The Relationship of Light intensity as calibrating signal, carry out linearity by background signal and calibrating signal and fit and can obtain working curve; Three-way solenoid valve (12) is converted to the conducting of a-b direction, and the conducting of sample gas gas circuit is carried out the gas detection and obtained detection signal, and the working curve that detection signal utilizes calibration process to obtain carries out automatic retrieving concentration, obtains the concentration measurement of each component gas.
2. SF according to claim 1
6Decomposition gas infrared spectrum polycomponent detection method is characterized in that described calibrating gas is the single or multicomponent gas of concentration known.
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