CN104280671B - Laser resonance Raman method for extra-high-voltage corona discharge early diagnosis - Google Patents
Laser resonance Raman method for extra-high-voltage corona discharge early diagnosis Download PDFInfo
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- CN104280671B CN104280671B CN201410519572.0A CN201410519572A CN104280671B CN 104280671 B CN104280671 B CN 104280671B CN 201410519572 A CN201410519572 A CN 201410519572A CN 104280671 B CN104280671 B CN 104280671B
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 81
- 238000013399 early diagnosis Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title abstract description 17
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 67
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 32
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000003384 imaging method Methods 0.000 claims abstract description 29
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 25
- 238000004458 analytical method Methods 0.000 claims abstract description 15
- 238000001237 Raman spectrum Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 7
- 230000035945 sensitivity Effects 0.000 claims abstract description 6
- 238000001429 visible spectrum Methods 0.000 claims abstract description 5
- 230000003595 spectral effect Effects 0.000 claims description 14
- 239000006185 dispersion Substances 0.000 claims description 12
- 238000001228 spectrum Methods 0.000 claims description 12
- 230000000007 visual effect Effects 0.000 claims description 12
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- 230000000694 effects Effects 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
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- 241000931526 Acer campestre Species 0.000 claims description 7
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention discloses a laser resonance Raman method for extra-high-voltage corona discharge early diagnosis. A diagnosis system adopted in the method is composed of a remote laser resonance Raman testing system (1) and a rotary lifting adjusting support (19). The remote laser resonance Raman testing system is composed of a main control analysis subsystem (10), a visible light imaging system (9), an ultraviolet source subsystem (12), a cassette telescope (21), an ultraviolet spectrograph (4) and an optical accessory. Corona discharge early diagnosis can be achieved by carrying out laser resonance Raman spectrum detection on extremely tiny amounts of ozone, nitrogen oxide and nitric oxide gas molecules produced in the early-stage corona discharge chemical effect. According to the laser resonance Raman method for extra-high-voltage corona discharge early diagnosis, remote visible spectrum detection operation is achieved through the visible light imaging and laser resonance Raman spectrum detection optical path sharing and automatic focusing technology, ozone molecule molecular resonance Raman spectrum detection with extremely high sensitivity is achieved, and nitric oxide and nitrogen dioxide Raman spectra are effectively detected.
Description
Technical field
The present invention relates to a kind of laser resonant Raman method of extra-high voltage corona discharge early diagnosiss, employ laser resonant
Raman technology, belongs to technical field of photoelectricity test.
Background technology
UHV transmission refers to 1000kV alternating voltage and positive and negative 800kV DC voltage power transmission engineering and technology.With
Progressively the building up of extra-high voltage grid, the safety guarantee that it runs is extremely important.In extra-high voltage grid accident, insulation fault occurs
Frequency higher, especially in the presence of extra-high voltage highfield, the corona discharge of electrical equipment is more incident accident, electricity
Corona is the discharge type after a kind of gas ionization, is a kind of powerful electromagnetic interference source.Corona discharge can cause electric energy to damage
Consumption, the interference to communication, shorten the service life of transmission line of electricity.
For targetedly reducing the harm of corona discharge, on-line monitoring is very necessary with diagnosis.Extra-high voltage grid insulate
Have high demands, terrain clearance is big, circuit pylon span is big, therefore on-line checking must adopt remote method.At present, conventional corona
Discharge examination has infrared imaging method, ultraviolet image method, ultrasonic depth finder etc..
Corona is a kind of luminous surface shelf depreciation, produces ionization due to air localized high intensity, this process causes
Small heat, infrared imaging method None- identified.When electrical equipment occurs shelf depreciation or corona, collateral radiation can go out ultraviolet
Line, its wave-length coverage is in 10-400nm.Ultraviolet image method service band, in 240-280nm, can be detected.But for early stage electricity
For corona, its intensity is atomic weak, the uitraviolet intensity very little of radiation, for the ultraviolet imager of remote detection, be difficult to from
In ambient interferences, corona discharge ultraviolet radioactive is judged by ultraviolet image gray difference.Ultrasonic depth finder is by putting to corona
Electricity produces the detection of the ultrasonic component of noise, and corona discharge is diagnosed, but long-range supersonic sounding is easily subject to environment noise
Impact, additionally, early stage corona discharge intensity is extremely weak, leads to its supersonic band noise intensity extremely weak, is difficult to detected.
Publication number CN102331540 discloses a kind of corona discharge of ultra-high voltage power transmission line on-Line Monitor Device and method,
It is after corona discharge, and analyzing judgement, it can put the monitoring ultraviolet light that sends of electric discharge to UHV transmission line corona
Being monitored after electricity, but it can not be monitored to early stage corona discharge.
Content of the invention
The purpose of the present invention is that the remote online in order to solve early stage corona discharge detects a difficult problem, and the present invention provides a kind of
Based on laser resonant Raman optical spectrum method, in order to produce in the chemical effect to early stage corona discharge extremely micro ozone,
Nitrogen dioxide and nitric oxide gas molecule are detected, thus realizing the early diagnosiss to corona discharge.
The laser resonant Raman spectra detection process that the present invention adopts is the extremely sensitive spectrographic technique of one kind, its adopt with
Frequency consistent or close laser in testing molecule Electron absorption peak excites to testing molecule, and the resonance that testing molecule produces is drawn
Graceful scattering ratio stimulated Raman scattering intensity big 104-106Times, its sensitivity has reached Single Molecule Detection level.Additionally, laser resonant
The optical maser wavelength that Raman spectrum detection adopts is located at ultraviolet section, can effectively overcome the interference to Raman signal for the fluorescence.
The technical scheme is that and be achieved in：
The laser resonant Raman method of extra-high voltage corona discharge early diagnosiss of the present invention passes through extra-high voltage corona discharge early stage
Diagnostic system is realizing.
A kind of extra-high voltage corona discharge early diagnosiss system is adjusted with rotation and lifting by remote laser resonance raman test system
Section support is constituted.Remote laser resonance raman test system is fixedly mounted in rotation and lifting adjusting bracket, can be revolved by operation
Turn lift adjustment and the rotation regulation that lift adjustment support carries out remote laser resonance raman test system, thus neatly changing
The direction of primary optical axis.
Remote laser resonance raman test system is by main control analyzing subsystem, visual light imaging subsystem, ultraviolet source
Subsystem, cassette telescope, ultraviolet spectrometer and optical accessory composition.
Visual light imaging subsystem comprises area array CCD, driving and imaging output circuit and display screen, for putting to corona
The remote visual light imaging in pyroelectric monitor region.
Ultraviolet source subsystem comprises Gao Zhongying ultrashort pulse laser, frequency-doubling crystal assembly, PCF（Photonic crystal fiber）
Bonder, PCF, ultraviolet narrow band pass filter and beam expanding lens, described Gao Zhongying ultrashort pulse laser, the pulse laser warp sending
Cross frequency-doubling crystal assembly, enter PCF through PCF bonder, obtain the output of ultraviolet super continuous spectrums pulse laser, then through ultraviolet arrowband
Optical filter, obtaining wavelength is λ1Ultraviolet pulse laser, then expand through beam expanding lens.Ultraviolet source subsystem is used for producing UV spectrum
The pulse laser of a certain wavelength of section；The laser beam that ultraviolet source subsystem produces is overlapped with cassette telescope optic axis, and this optical axis is
Remote laser resonance raman test system primary optical axis.
Cassette telescope, i.e. Cassegrain telescope, its core component is primary mirror, secondary mirror and secondary mirror electrical servo machine
Structure.The silver-plated concave mirror of perforate wherein centered on primary mirror, secondary mirror is silver-plated convex reflecting mirror, and secondary mirror electric servomechanism can carry
Dynamic secondary mirror moves forward and backward along primary optical axis.Cassette telescope is used for the pulse laser of ultraviolet source subsystem output is remotely gathered
Jiao and the collection to resonance Raman spectroscopy signal.
Optical accessory includes circular hole bonder, optical fiber, UV, visible light beam splitter and beam splitter；Beam splitter becomes 45 with primary optical axis
Degree angle is placed, and being coated with wavelength is λ1(excite ozone produce resonance LR laser raman effect needed for optical maser wavelength) high transmittance film and
UV, visible light high-reflecting film；Secondary optical axis is vertical with primary optical axis；UV, visible light beam splitter and beam splitter are placed in parallel, with secondary optical axis included angle
For 45 degree, secondary optical axis with UV, visible light beam splitter intersection point isA；UV, visible light beam splitter is coated with ultraviolet spectral coverage high transmittance film and visible spectrum
Section high-reflecting film；Circular hole bonder is symmetrical with regard to UV, visible light beam splitter conjugation with area array CCD, that is,APoint to circular hole bonder away from
From being equal toAPoint is to the distance of area array CCD；Circular hole bonder center-hole diameter is equal with fibre external diameters.
Main control analyzing subsystem, containing controlling hardware and host software, for controlling ultraviolet spectrometer, visual light imaging
The work of subsystem, Gao Zhongying ultrashort pulse laser and secondary mirror electric servomechanism；Receive the output digitized map of area array CCD
Picture is simultaneously analyzed；Receive the output spectrum signal of ultraviolet spectrometer and be analyzed.
When needing to carry out early diagnosiss to extra-high voltage corona discharge, detected according to the following steps：
(1) coarse adjustment
Operation rotation and lifting adjusting bracket carries out the lift adjustment of remote laser resonance raman test system and rotation is adjusted,
Change the direction of primary optical axis so as to range estimation is preliminary is directed at detection of Corona Discharge region.
Main control analyzing subsystem sends instruction, starts and drives and imaging output circuit, so that area array CCD is started working.Can
See that photoimaging subsystem carries out remote visible spectrum digital image by cassette telescope to the object in its field range,
It is anti-that the visible spectral coverage light that object in field range sends sequentially passes through primary mirror, secondary mirror, beam splitter, UV, visible light beam splitter
Penetrate, image in area array CCD.The digital picture of area array CCD output, a road is received by main control analyzing subsystem, and another road is simultaneously
Output shows on a display screen in real time.
(2) fine tuning and auto-focusing
Observe the real time imaging on display screen, finely tune rotation and lifting adjusting bracket simultaneously, change the direction of primary optical axis, make electricity
Corona monitored area accurately shows on a display screen, even if detection of Corona Discharge region accurate imaging is on area array CCD.This
When, main control analyzing subsystem receives the digital picture of area array CCD output, carries out fast fourier transform in real time to it, subsequently
Carry out real-time frequency domain analysis.Meanwhile, main control analyzing subsystem sends control instruction, starts secondary mirror electric servomechanism, drives
Secondary mirror moves forward and backward along primary optical axis.During movement, the real-time frequency domain analysis synchronization to real-time digital image is carried out, when frequency
When high fdrequency components in domain account for the ratio highest of total frequency domain distribution, when that is, the digital picture details of area array CCD output is the abundantest,
Then it is in focus state, the focus plane that is, the detection of Corona Discharge region of distant location is imaged and face battle array by cassette telescope
CCD is completely superposed.Now, main control analyzing subsystem sends control instruction, stops the work of secondary mirror electric servomechanism.
(3) ultraviolet pulse laser remotely focuses on
Main control analyzing subsystem sends instruction, starts Gao Zhongying ultrashort pulse laser, and the pulse laser sending passes through
Frequency-doubling crystal assembly, enters PCF through PCF bonder, obtains the output of ultraviolet super continuous spectrums pulse laser, then through the filter of ultraviolet arrowband
Mating plate, obtaining wavelength is λ1（Ozone is excited to produce the optical maser wavelength needed for resonance LR laser raman effect）Ultraviolet pulse swash
Light, then through beam expanding lens（It is λ that surface is coated with wavelength1Anti-reflection film）Expand, pierce into from the centre bore of the primary mirror of cassette telescope.Again
After silvered reflective face through secondary mirror and primary mirror is reflected, focus on remote laser focusing point.Laser focusing point is corona discharge
Monitored area and the intersection point of primary optical axis.
(4) laser resonant Raman analysis
Below air layer height 1km, the content of ozone is extremely low and the dirt of nitric oxide, the content of nitrogen dioxide and air
Dye degree is relevant, and in the big place of pollution level, content is relatively higher；In the low place of pollution level, content is very low.The present invention
Mainly by the ozone molecule detection at laser focusing point, being aided with the detection to nitric oxide, nitrogen dioxide molecules and coming to morning
Phase corona discharge is diagnosed.
The corresponding feature Stokes Raman frequency displacement of ozone molecule, nitric oxide molecule, nitrogen dioxide molecules is different, to ripple
A length of λ1Laser excitation wavelength for, ozone molecule corresponding Stokes Raman dispersion wavelength be λ2；Nitrogen dioxide molecules pair
The Stokes Raman dispersion wavelength answered is λ3；Nitric oxide molecule corresponding Stokes Raman dispersion wavelength is λ4.
By to λ2、λ3、λ4The raman spectrum strength analysis of three wavelength, can determine whether whether there is ozone at laser focusing point
Molecule, nitric oxide molecule, nitrogen dioxide molecules, and their concentration.
Wavelength is λ1Ultraviolet pulse laser excite at laser focusing point Stokes Raman scattered signal (note：Ripple
Length is more than λ1) successively through primary mirror, secondary mirror, beam splitter reflection after to UV, visible light beam splitter, the only Stokes of ultraviolet spectral coverage
Raman scattering signal can pass through UV, visible light beam splitter.Circular hole bonder is used for eliminating the impact of spuious optical signal, and circular hole couples
Device and area array CCD, with regard to the conjugation symmetric design of UV, visible light beam splitter, can make the Stokes exciting at laser focusing point draw
Graceful scattered signal is accurately coupled into optical fiber.The ultraviolet spectral coverage Stokes Raman scattered signal of coupled into optical fibres enters ultraviolet light
Spectrometer carries out ultraviolet spectrometry, opto-electronic conversion, and the output spectrum signal of ultraviolet spectrometer is received by main control analyzing subsystem, carries out
Uv raman spectroscopy is analyzed.
Wavelength X1For exciting ozone to produce the optical maser wavelength needed for resonance LR laser raman effect, in this wavelength pulsed laser
Excite down, ozone molecule corresponding Stokes Raman dispersion wavelength λ2The signal at place will increase 104To 106Times, ozone can be divided
The change of sub- denier concentration is detected.To nitric oxide molecule, nitrogen dioxide molecules, wavelength X1Pulse laser can only swash
Send conventional stimulated Raman scattering signal, its detection sensitivity is relatively lower, in the present invention, to nitric oxide molecule, two
The detection of oxidation nitrogen molecular helps out.
(5) corona discharge early diagnosiss
Criterion is as follows：
At laser focusing point during no early stage corona discharge, the gas molecule at this consists of atmospheric molecule composition.Ozone
The corresponding λ of molecule, nitric oxide molecule, nitrogen dioxide molecules2、λ3、λ4The Raman line intensity of three wavelength is relatively very little；
When there is early stage corona discharge at laser focusing point, produce the ozone molecule of denier at this, nitric oxide divides
Son, nitrogen dioxide molecules, compare with Atmospheric composition, ozone molecule, nitric oxide molecule, nitrogen dioxide molecules at laser focusing point
An atomic little concentration is had to increase.Due to resonance Raman effect, λ2The Raman line intensity at place will have a huge increase,
And λ3、λ4The Raman line intensity at place will have a small increase.
Criterion accordingly, can determine whether to whether there is early stage corona discharge at laser focusing point.
The invention has the beneficial effects as follows, detect that light path shares and automatic by visual light imaging and laser resonant Raman spectrum
Focusing technology, realizes the operation of remote visualization spectral detection, can accurately select test point；Resonance Raman effect is produced using ozone
Required Ultra-Violet Laser wavelength, can achieve that extremely highly sensitive ozone molecule detects, overcomes fluorescence interference simultaneously, can be to an oxygen
Change nitrogen and the Raman spectrum of nitrogen dioxide is effectively detected.By above-mentioned measure, can achieve early stage atomic light current corona
High sensitivity diagnoses.
Brief description
Fig. 1 is present system structure and test philosophy schematic diagram；
In in figure, 1 is remote laser resonance raman test system；2 is circular hole bonder；3 is optical fiber；4 is ultraviolet spectra
Instrument；5 is UV, visible light beam splitter；6 is area array CCD (i.e. charge-coupled image sensor)；7 is to drive and imaging output circuit；8 is display
Screen；9 is visual light imaging subsystem；10 is main control analyzing subsystem；11 is beam splitter；12 is ultraviolet source subsystem；13
It is Gao Zhongying ultrashort short pulse laser instrument；14 is frequency-doubling crystal assembly；15 is PCF (i.e. photonic crystal fiber) bonder；16 are
PCF；17 is ultraviolet narrow band pass filter；18 is beam expanding lens；19 is rotation and lifting adjusting bracket；20 is primary mirror；21 is that cassette is looked in the distance
Mirror；22 is secondary mirror electric servomechanism；23 is secondary mirror；24 is primary optical axis；25 is laser focusing point；26 is detection of Corona Discharge area
Domain；27 is extra-high voltage electrical equipment；28 is time optical axis.
Specific embodiment
The specific embodiment of the invention is as shown in Figure 1.
Extra-high voltage electrical equipment 27 is in the middle of the highfield of extra-high voltage formation for a long time, in the presence of highfield, electrically
In apparatus insulated, the part of some weaknesses is easy for shelf depreciation, when its electric field intensity is strong more than the ionization of gas in air
When spending, corona discharge will be produced.The region that corona discharge may be produced is detection of Corona Discharge region 26, typically extra-high
Have in voltage electrical equipment larger geometric buckling partly near.When there is early stage corona discharge in extra-high voltage electrical equipment 27, electricity
The ozone, nitric oxide and the nitrogen dioxide that have denier concentration are produced by corona monitored area 26.By micro dense to this
The ozone monitoring of degree and the monitoring to nitric oxide and content of nitrogen dioxide change, can determine whether early stage corona discharge.
The present embodiment is performed such：
Extra-high voltage corona discharge early diagnosiss system is adjusted with rotation and lifting by remote laser resonance raman test system 1 and props up
Frame 19 is constituted.Remote laser resonance raman test system 1 is fixedly mounted in rotation and lifting adjusting bracket 19, can be revolved by operation
Turn lift adjustment and the rotation regulation that lift adjustment support 19 carries out remote laser resonance raman test system 1, thus neatly
Change the direction of primary optical axis 24.
Remote laser resonance raman test system 1 is by main control analyzing subsystem 10, visual light imaging subsystem 9, ultraviolet
Light source subsystem 12, cassette telescope 21, ultraviolet spectrometer 4 and optical accessory composition.
Visual light imaging subsystem 9 comprises area array CCD 6, drives and imaging output circuit 7 and display screen 8, for electricity
The remote visual light imaging of corona monitored area 26.
Ultraviolet source subsystem 12 comprises Gao Zhongying ultrashort pulse laser 13, frequency-doubling crystal assembly 14, PCF bonder
15th, PCF 16, ultraviolet narrow band pass filter 17 and beam expanding lens 18, for producing the pulse laser of a certain wavelength of ultraviolet spectral coverage；Ultraviolet
Light source subsystem 12 and cassette telescope 21 optical axis coincidence, this optical axis is remote laser resonance raman test system 1 primary optical axis 24.
Gao Zhongying ultrashort pulse laser 13 adopts pulsewidth 20ps, repetition 80MHz, centre wavelength in the present embodiment
The diode pumped solid state laser of 1064nm；Frequency-doubling crystal assembly 14 is combined by two pieces of frequency-doubling crystals, obtains middle cardiac wave
The pulse laser output of long 266nm；PCF bonder 15 adopts 20 x Microscope Objectives；It is 266nm that PCF 16 adopts zero-dispersion wavelength
Photonic crystal fiber, obtain 200nm-450nm ultraviolet super continuous spectrums pulse laser output.
Cassette telescope 21, i.e. Cassegrain telescope, its core component is primary mirror 20, secondary mirror 23 and secondary mirror is electronic watches
Take mechanism 22.The silver-plated concave mirror of perforate wherein centered on primary mirror 20, secondary mirror 23 is silver-plated convex reflecting mirror, and secondary mirror is electronic to be watched
Taking mechanism 22 can drive secondary mirror 23 to move forward and backward along primary optical axis 24.Cassette telescope 21 is used for ultraviolet source subsystem 12 is exported
Pulse laser remotely focused on and the collection to resonance Raman spectroscopy signal.
Optical accessory includes circular hole bonder 2, optical fiber 3, UV, visible light beam splitter 5 and beam splitter 11；Beam splitter 5 and key light
45 degree of angles of 24 one-tenth of axle are placed, and being coated with wavelength is λ1(excite ozone to produce the optical maser wavelength needed for resonance LR laser raman effect,
In the present embodiment be 203.77nm) high transmittance film and UV, visible light high-reflecting film (in the present embodiment for 205nm-760nm)；Secondary light
Axle 28 is vertical with primary optical axis 24；UV, visible light beam splitter 5 is placed in parallel with beam splitter 11, is 45 degree with secondary optical axis 28 angle, secondary
Optical axis 28 with UV, visible light beam splitter 5 intersection point isA；UV, visible light beam splitter 5 be coated with ultraviolet spectral coverage (in the present embodiment for
205nm-400nm) high transmittance film and visible spectral coverage (in the present embodiment for 400nm-760nm) high-reflecting film；Circular hole bonder 2 and face
Battle array CCD 6 is conjugated symmetrically with regard to UV, visible light beam splitter 5, that is,AThe distance of point to circular hole bonder 2 is equal toAPoint arrives area array CCD 6
Distanced；Circular hole bonder 2 center-hole diameter is equal with optical fiber 3 external diameter.
Main control analyzing subsystem 10, containing controlling hardware and host software, for controlling ultraviolet spectrometer 4, visible ray
The work of imaging subsystems 9, Gao Zhongying ultrashort pulse laser 13 and secondary mirror electric servomechanism 22；Receive area array CCD 6
Output digital image is simultaneously analyzed；Receive the output spectrum signal of ultraviolet spectrometer 4 and be analyzed.
When needing to carry out early diagnosiss to extra-high voltage corona discharge, detected according to the following steps：
(1) coarse adjustment
Operation rotation and lifting adjusting bracket 19 carries out the lift adjustment of remote laser resonance raman test system 1 and rotation is adjusted
Section, changes the direction of primary optical axis 24 so as to range estimation is preliminary is directed at detection of Corona Discharge region 26.
Main control analyzing subsystem 10 sends instruction, starts and drives and imaging output circuit 7, makes area array CCD 6 start work
Make.Visual light imaging subsystem 9 carries out remote visible spectrum by cassette telescope 21 to the object in its field range
Digital image, the 400nm-760nm that the object in field range sends visible spectral coverage light sequentially pass through primary mirror 20, secondary mirror 23,
Beam splitter 11, UV, visible light beam splitter 5 reflect, and image in area array CCD 6.The digital picture of area array CCD 6 output, a road is led
Analyzing subsystem 10 is controlled to receive, another road exports simultaneously and shows in real time on display screen 8.
(2) fine tuning and auto-focusing
Observe the real time imaging on display screen 8, finely tune rotation and lifting adjusting bracket 19 simultaneously, change the side of primary optical axis 24
To making detection of Corona Discharge region 26 accurately be shown on display screen 8, even if detection of Corona Discharge region 26 accurate imaging is to face
On battle array CCD 6.Now, main control analyzing subsystem 10 receives the digital picture of area array CCD 6 output, and it is carried out quickly in real time
Fourier transform, subsequently carries out real-time frequency domain analysis.Meanwhile, main control analyzing subsystem 10 sends control instruction, starts secondary mirror
Electric servomechanism 22, drives secondary mirror 23 to move forward and backward along primary optical axis 24.Reality during movement, to real-time digital image
Time-Frequency Analysis are synchronously carried out, and when the high fdrequency components in frequency domain account for the ratio highest of total frequency domain distribution, that is, area array CCD 6 exports
Digital picture details the abundantest when, then be in focus state, that is, cassette is passed through in the detection of Corona Discharge region 26 of distant location
The focus plane of telescope 21 imaging is completely superposed with area array CCD 6.Now, main control analyzing subsystem 10 sends control and refers to
Order, stops the work of secondary mirror electric servomechanism 22.
(3) ultraviolet pulse laser remotely focuses on
Main control analyzing subsystem 10 sends instruction, starts Gao Zhongying ultrashort pulse laser 13, pulsewidth 20ps sending,
Repetition 80MHz, the pulse laser of centre wavelength 1064nm, through frequency-doubling crystal assembly 14, obtain the pulse of centre wavelength 266nm
Laser exports, and enters PCF 16 through PCF bonder 15, obtains the ultraviolet super continuous spectrums pulse laser output of 200nm-450nm,
Again through ultraviolet narrow band pass filter 17, obtaining wavelength is λ1(ozone is excited to produce the laser wave needed for resonance LR laser raman effect
Long, in the present embodiment for 203.77nm) ultraviolet pulse laser, then (it is λ that surface is coated with wavelength through beam expanding lens 181Anti-reflection
Film) expand, pierce into from the centre bore of the primary mirror 20 of cassette telescope 21.Silvered reflective face through secondary mirror 23 and primary mirror 20 is reflected again
Afterwards, focus on remote laser focusing point 25.Laser focusing point 25 is the friendship in detection of Corona Discharge region 26 and primary optical axis 24
Point.
(4) laser resonant Raman analysis
Below air layer height 1km, the content of ozone is extremely low and the dirt of nitric oxide, the content of nitrogen dioxide and air
Dye degree is relevant, and in the big place of pollution level, content is relatively higher；In the low place of pollution level, content is very low.The present invention
Mainly by the ozone molecule detection at laser focusing point 25, being aided with the detection to nitric oxide, nitrogen dioxide molecules next right
Early stage corona discharge is diagnosed.
The corresponding feature Stokes Raman frequency displacement of ozone molecule, nitric oxide molecule, nitrogen dioxide molecules is different, to ripple
A length of λ1Laser excitation wavelength for, ozone molecule corresponding Stokes Raman dispersion wavelength be λ2(in the present embodiment for
208.2nm)；Nitrogen dioxide molecules corresponding Stokes Raman dispersion wavelength is λ3(in the present embodiment for 209.41nm)；
Nitric oxide molecule corresponding Stokes Raman dispersion wavelength is λ4(in the present embodiment for 211.88nm).
By to λ2、λ3、λ4Whether the raman spectrum strength analysis of three wavelength, can determine whether to have at laser focusing point 25 smelly
Oxygen molecule, nitric oxide molecule, nitrogen dioxide molecules, and their concentration.
Wavelength is λ1Ultraviolet pulse laser excite at laser focusing point 25 Stokes Raman scattered signal (note：
Wavelength is more than λ1) successively through primary mirror 20, secondary mirror 23, beam splitter 11 reflection after to UV, visible light beam splitter 5, only ultraviolet spectral coverage
The Stokes Raman scattered signal of (in the present embodiment for 205nm-400nm) can pass through UV, visible light beam splitter 5.Circular hole coupling
Clutch 2 is used for eliminating the impact of spuious optical signal, and circular hole bonder 2 and area array CCD 6 are with regard to the conjugation of UV, visible light beam splitter 5
Symmetric design, can make the Stokes Raman scattered signal exciting at laser focusing point 25 accurately be coupled into optical fiber 3.It is coupled into
The ultraviolet spectral coverage Stokes Raman scattered signal of optical fiber 3 enters ultraviolet spectrometer 4 and carries out ultraviolet spectrometry, opto-electronic conversion, ultraviolet
The output spectrum signal of spectrogrph 4 is received by main control analyzing subsystem 10, carries out uv raman spectroscopy analysis.
Wavelength X1For exciting ozone to produce the optical maser wavelength needed for resonance LR laser raman effect, in this wavelength pulsed laser
Excite down, ozone molecule corresponding Stokes Raman dispersion wavelength λ2The signal at place will increase 104To 106Times, ozone can be divided
The change of sub- denier concentration is detected.To nitric oxide molecule, nitrogen dioxide molecules, wavelength X1Pulse laser can only swash
Send conventional stimulated Raman scattering signal, its detection sensitivity is relatively lower, in the present invention, to nitric oxide molecule, two
The detection of oxidation nitrogen molecular helps out.
(5) corona discharge early diagnosiss
Criterion is as follows：
At laser focusing point 25 during no early stage corona discharge, the gas molecule at this consists of atmospheric molecule composition.Smelly
The corresponding λ of oxygen molecule, nitric oxide molecule, nitrogen dioxide molecules2、λ3、λ4The Raman line intensity of three wavelength is relatively very
Little；
When there is early stage corona discharge at laser focusing point 25, produce ozone molecule, the nitric oxide of denier at this
Molecule, nitrogen dioxide molecules, compare with Atmospheric composition, ozone molecule, nitric oxide molecule, nitrogen dioxide at laser focusing point 25
Molecule has an atomic little concentration to increase.Due to resonance Raman effect, λ2The Raman line intensity at place by have one huge
Increase, and λ3、λ4The Raman line intensity at place will have a small increase.
Criterion accordingly, can determine whether to whether there is early stage corona discharge at laser focusing point 25.
Claims (1)
1. a kind of extra-high voltage corona discharge early diagnosiss system, including rotation and lifting adjusting bracket it is characterised in that also including remote
Journey laser resonant Raman test system；Described remote laser resonance raman test system includes main control analyzing subsystem, visible
Photoimaging subsystem, ultraviolet source subsystem, cassette telescope and ultraviolet spectrometer；Described visual light imaging subsystem, comprises
Area array CCD, driving and imaging output circuit and display screen；Described ultraviolet source subsystem, comprises Gao Zhongying ultra-short pulse laser
Device, frequency-doubling crystal assembly, PCF bonder, PCF, ultraviolet narrow band pass filter and beam expanding lens；Described Gao Zhongying ultra-short pulse laser
Device, the pulse laser sending, through frequency-doubling crystal assembly, enters PCF through PCF bonder, obtains ultraviolet super continuous spectrums pulse and swashs
Light output, then through ultraviolet narrow band pass filter, obtaining wavelength is λ1Ultraviolet pulse laser, then expand through beam expanding lens, be then passed through card
Formula telescope, forms remote laser resonance raman test system primary optical axis；The core component of described cassette telescope is primary mirror, secondary
Mirror and secondary mirror electric servomechanism；
The laser resonant Raman diagnostic method of described extra-high voltage corona discharge early diagnosiss system comprises the following steps：
(1) coarse adjustment
Operation rotation and lifting adjusting bracket carries out the lift adjustment of remote laser resonance raman test system and rotation is adjusted, and changes
The direction of primary optical axis is directed at detection of Corona Discharge region so as to range estimation is preliminary；
Main control analyzing subsystem sends instruction, starts and drives and imaging output circuit, so that area array CCD is started working；Visible ray
Imaging subsystems carry out remote visible spectrum digital image, visual field by cassette telescope to the object in its field range
In the range of the visible spectral coverage light that sends of object sequentially pass through primary mirror, secondary mirror, beam splitter, the reflection of UV, visible light beam splitter, become
As in area array CCD；The digital picture of area array CCD output, a road is received by main control analyzing subsystem, and another road exports simultaneously
Show in real time on display screen；
(2) fine tuning and auto-focusing
Observe the real time imaging on display screen, finely tune rotation and lifting adjusting bracket simultaneously, change the direction of primary optical axis, so that corona is put
Pyroelectric monitor region accurately shows on a display screen, even if detection of Corona Discharge region accurate imaging is on area array CCD；Now, main
Control analyzing subsystem to receive the digital picture of area array CCD output, fast fourier transform is carried out in real time to it, subsequently carries out reality
Time-Frequency Analysis；Meanwhile, main control analyzing subsystem sends control instruction, starts secondary mirror electronic Si Fu mechanism, drives secondary mirror edge
Primary optical axis moves forward and backward；During movement, the real-time frequency domain analysis synchronization to real-time digital image is carried out, when in frequency domain
When high fdrequency components account for the ratio highest of total frequency domain distribution, when that is, the digital picture details of area array CCD output is the abundantest, then it is in conjunction
Coke-like state, the focus plane that is, the detection of Corona Discharge region of distant location is imaged by cassette telescope is complete with area array CCD
Overlap；Now, main control analyzing subsystem sends control instruction, stops the work of secondary mirror electronic Si Fu mechanism；
(3) ultraviolet pulse laser remotely focuses on
Main control analyzing subsystem sends instruction, starts Gao Zhongying ultrashort pulse laser, the pulse laser sending is through frequency multiplication
Crystal assembly, enters PCF through PCF bonder, obtains the output of ultraviolet super continuous spectrums pulse laser, then through ultraviolet narrow-band-filter
Piece, obtaining wavelength is λ1Ultraviolet pulse laser, then expand through beam expanding lens, pierce into from the centre bore of the primary mirror of cassette telescope；
After silvered reflective face through secondary mirror and primary mirror is reflected again, focus on remote laser focusing point；Laser focusing point is put for corona
Pyroelectric monitor region and the intersection point of primary optical axis；
(4) laser resonant Raman analysis
By to λ2、λ3、λ4The raman spectrum strength analysis of three wavelength, can determine whether at laser focusing point, whether there is ozone molecule,
Nitric oxide molecule, nitrogen dioxide molecules, and their concentration；Wherein, λ2Draw for the corresponding Stokes of ozone molecule
Graceful dispersion wavelength, λ3For nitrogen dioxide molecules corresponding Stokes Raman dispersion wavelength, λ4Be nitric oxide molecule corresponding this
Lentor Raman scattering wavelength；
Wavelength is λ1The Stokes Raman scattered signal that excites at laser focusing point of ultraviolet pulse laser successively through primary mirror,
To UV, visible light beam splitter after secondary mirror, beam splitter reflection, the only Stokes Raman scattered signal of ultraviolet spectral coverage can be through purple
Visible beam splitter outward；Ultraviolet spectral coverage Stokes Raman scattered signal through circular hole bonder coupled into optical fibres enters ultraviolet spectra
Instrument carries out ultraviolet spectrometry, opto-electronic conversion, and the output spectrum signal of ultraviolet spectrometer is received by main control analyzing subsystem, carries out purple
Outer Raman spectrum analyses；
Wavelength X1For exciting ozone to produce the optical maser wavelength needed for resonance LR laser raman effect, exciting in this wavelength pulsed laser
Under, ozone molecule corresponding Stokes Raman dispersion wavelength λ2The signal at place will increase 104To 106Times, can be to ozone molecule pole
The change of micro-concentrations is detected；To nitric oxide molecule and nitrogen dioxide molecules, wavelength X1Pulse laser can only excite
Go out conventional stimulated Raman scattering signal, its detection sensitivity is relatively lower, to nitric oxide molecule and nitrogen dioxide molecules
Detection helps out；
(5) corona discharge early diagnosiss
Criterion is as follows：
At laser focusing point during no early stage corona discharge, the gas molecule at this consists of atmospheric molecule composition；Ozone molecule,
The corresponding λ of nitric oxide molecule, nitrogen dioxide molecules2、λ3、λ4The Raman line intensity of three wavelength is relatively very little；
When there is early stage corona discharge at laser focusing point, produce at this ozone molecule of denier, nitric oxide molecule, two
Oxidation nitrogen molecular, compares with Atmospheric composition, at laser focusing point, ozone molecule, nitric oxide molecule, nitrogen dioxide molecules have one
Individual atomic little concentration increases；Due to resonance Raman effect, λ2The Raman line intensity at place will have a huge increase, and λ3、
λ4The Raman line intensity at place will have a small increase；
Criterion accordingly, can determine whether to whether there is early stage corona discharge at laser focusing point.
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| CN104849257B (en) * | 2015-06-02 | 2017-06-27 | 中国科学院上海技术物理研究所 | Resonance Raman spectroscopy detection system and method based on small ultraviolet sweeping laser |
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| CN106546334A (en) * | 2016-11-03 | 2017-03-29 | 北京信息科技大学 | Space autofocusing confocal laser Raman spectroscopic detection method and apparatus |
| JP7122008B2 (en) * | 2017-09-29 | 2022-08-19 | 株式会社四国総合研究所 | Substance remote identification device and substance remote identification method |
| CN112362635A (en) * | 2020-11-02 | 2021-02-12 | 公安部第三研究所 | Remote material detection device based on ultraviolet Raman spectrum analysis |
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