CN104280671A - 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
- Publication number
- CN104280671A CN104280671A CN201410519572.0A CN201410519572A CN104280671A CN 104280671 A CN104280671 A CN 104280671A CN 201410519572 A CN201410519572 A CN 201410519572A CN 104280671 A CN104280671 A CN 104280671A
- Authority
- CN
- China
- Prior art keywords
- corona discharge
- laser
- ultraviolet
- raman
- wavelength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
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 the laser resonant Raman method of a kind of extra-high voltage corona discharge early diagnosis, have employed laser resonant Raman technology, belong 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.Along with progressively building up of extra-high voltage grid, its safety guarantee run is extremely important.In extra-high voltage grid accident, the frequency that insulation fault occurs is higher, and especially under the effect of extra-high voltage highfield, the corona discharge of electrical equipment is more incident accident, corona discharge is the discharge type after a kind of gas ionization, is a kind of powerful electromagnetic interference source.Corona discharge can cause electric energy loss, to the interference of communication, shortens the serviceable life of transmission line of electricity.
For reducing the harm of corona discharge targetedly, on-line monitoring is very necessary with diagnosis.Extra-high voltage grid insulating requirements is high, terrain clearance large, circuit pylon span is large, and therefore on-line checkingi must adopt remote method.At present, conventional corona discharge detects infrared imaging method, ultraviolet image method, ultrasonic wave detector etc.
Corona is a kind of surperficial shelf depreciation of luminescence, produces ionization due to air localized high intensity, and this process causes small heat, infrared imaging method None-identified.When electrical equipment generation shelf depreciation or corona, collateral radiation can go out ultraviolet, its wavelength coverage is at 10-400nm.Ultraviolet image method service band, at 240-280nm, can detect.But for early stage corona discharge, its intensity is atomic weak, the uitraviolet intensity of radiation is very little, for the ultraviolet imager of remote detection, is difficult to judge corona discharge UV radiation by ultraviolet image gray difference from background interference.Ultrasonic wave detector, by producing the detection of the ultrasonic component of noise to corona discharge, diagnose, but long-range supersonic sounding is subject to Environmental Noise Influence to corona discharge, in addition, early stage corona discharge intensity is extremely weak, causes 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 by after corona discharge, the ultraviolet light that monitoring electric discharge sends is to analyze judgement, it can be monitored the carrying out after corona discharge of ultra-high voltage power transmission line, but it can not be monitored early stage corona discharge.
Summary of the invention
The object of the invention is, in order to the remote online solving early stage corona discharge detects a difficult problem, the invention provides a kind of based on laser resonant Raman optical spectrum method, extremely micro-ozone, nitrogen dioxide and nitric oxide gas molecule in order to produce in the chemical effect to early stage corona discharge detect, thus realize the early diagnosis to corona discharge.
The laser resonant Raman spectra detection process that the present invention adopts is a kind of extremely sensitive spectrographic technique, it adopts the laser consistent or close with testing molecule Electron absorption peak frequency to excite testing molecule, the resonance Raman scattering larger than stimulated Raman scattering intensity 10 that testing molecule produces
4-10
6doubly, its sensitivity has reached Single Molecule Detection level.In addition, laser resonant Raman spectrum detects the optical maser wavelength adopted and is positioned at ultraviolet section, effectively can overcome the interference of fluorescence to Raman signal.
Technical scheme of the present invention is achieved like this:
The laser resonant Raman method of extra-high voltage corona discharge of the present invention early diagnosis is realized by extra-high voltage corona discharge early diagnosis system.
A kind of extra-high voltage corona discharge early diagnosis system is regulated to prop up by remote laser resonance raman test macro and rotation and lifting and is configured to.Remote laser resonance raman test macro is fixedly mounted on rotation and lifting and regulates on support, regulates support carry out the lift adjustment of remote laser resonance raman test macro and rotate adjustment, thus change the direction of primary optical axis neatly by operation rotation and lifting.
Remote laser resonance raman test macro is made up of main control analyzing subsystem, visual light imaging subsystem, ultraviolet source subsystem, cassette telescope, ultraviolet spectrometer (UVS) and optical accessory.
Visual light imaging subsystem comprises area array CCD, driving and imaging output circuit and display screen, for the remote visual light imaging to detection of Corona Discharge region.
Ultraviolet source subsystem comprises Gao Zhongying ultrashort pulse laser, frequency-doubling crystal assembly, PCF(photonic crystal fiber) coupling mechanism, PCF, ultraviolet narrow band pass filter and beam expanding lens, described Gao Zhongying ultrashort pulse laser, the pulse laser sent is through frequency-doubling crystal assembly, PCF is entered through PCF coupling mechanism, obtain ultraviolet excess continuous spectrum pulse laser to export, again through ultraviolet narrow band pass filter, obtaining wavelength is λ
1ultraviolet pulse laser, then to expand through beam expanding lens.Ultraviolet source subsystem is for generation of the pulse laser of a certain wavelength of ultraviolet spectral coverage; The laser beam that ultraviolet source subsystem produces overlaps with cassette telescope optic axis, and this optical axis is remote laser resonance raman test macro primary optical axis.
Cassette telescope, i.e. Cassegrain telescope, its core component is primary mirror, secondary mirror and secondary mirror electric servomechanism.The wherein silver-plated concave mirror of perforate centered by primary mirror, secondary mirror is silver-plated convex reflecting mirror, and secondary mirror electric servomechanism can drive secondary mirror to move forward and backward along primary optical axis.The pulse laser that cassette telescope is used for ultraviolet source subsystem exports carries out long-range focusing and the collection to resonance Raman spectroscopy signal.
Optical accessory comprises circular hole coupling mechanism, optical fiber, UV, visible light beam splitter and beam splitter; Beam splitter becomes miter angle to place with primary optical axis, being coated with wavelength is λ
1the high transmittance film of (namely exciting ozone to produce the optical maser wavelength resonated needed for laser raman effect) and UV, visible light high-reflecting film; Secondary optical axis is vertical with primary optical axis; The placement parallel with beam splitter of UV, visible light beam splitter is 45 degree with secondary optical axis included angle, and secondary optical axis and UV, visible light beam splitter intersection point are
a; UV, visible light beam splitter is coated with ultraviolet spectral coverage high transmittance film and visible spectral coverage high-reflecting film; Circular hole coupling mechanism and area array CCD are symmetrical about UV, visible light beam splitter conjugation, namely
apoint equals to the distance of circular hole coupling mechanism
apoint is to the distance of area array CCD; Circular hole coupling mechanism center-hole diameter is equal with fibre external diameters.
Main control analyzing subsystem, containing control hardware and host software, for controlling the work of ultraviolet spectrometer (UVS), visual light imaging subsystem, Gao Zhongying ultrashort pulse laser and secondary mirror electric servomechanism; Receive the output digital image of area array CCD and analyze; Receive the output spectrum signal of ultraviolet spectrometer (UVS) and analyze.
When needs carry out early diagnosis to extra-high voltage corona discharge, detect according to the following steps:
(1) coarse adjustment
Operation rotation and lifting adjustment support carries out the lift adjustment of remote laser resonance raman test macro and rotates adjustment, changes the direction of primary optical axis, makes it estimate preliminary aligning detection of Corona Discharge region.
Main control analyzing subsystem sends instruction, starts and drives and imaging output circuit, area array CCD is started working.Visual light imaging subsystem carries out remote visible spectrum digital imagery by cassette telescope to the object in its field range, the visible spectral coverage light that object in field range sends through primary mirror, secondary mirror, beam splitter, the reflection of UV, visible light beam splitter, images in area array CCD successively.The digital picture that area array CCD exports, a road is received by main control analyzing subsystem, and another road exports simultaneously and shows in real time on a display screen.
(2) fine tuning and auto-focusing
Observe the realtime graphic on display screen, finely tune rotation and lifting simultaneously and regulate support, change the direction of primary optical axis, detection of Corona Discharge region is accurately shown on a display screen, even if detection of Corona Discharge region accurate imaging is on area array CCD.Now, main control analyzing subsystem receives the digital picture that area array CCD exports, and carries out fast fourier transform in real time, carry out real-time frequency domain analysis subsequently to it.Meanwhile, main control analyzing subsystem sends steering order, starts secondary mirror electric servomechanism, drives secondary mirror to move forward and backward along primary optical axis.In the process of movement, the real-time frequency domain analysis of real-time digital image is synchronously carried out, when the ratio that the high fdrequency component in frequency domain accounts for total frequency domain distribution is the highest, namely when the digital picture details that area array CCD exports is enriched most, then be in focus state, namely the detection of Corona Discharge region of distant location is overlapped with area array CCD completely by the focus plane of cassette telescope imaging.Now, main control analyzing subsystem sends steering order, stops the work of secondary mirror electric servomechanism.
(3) the long-range focusing of ultraviolet pulse laser
Main control analyzing subsystem sends instruction, and start Gao Zhongying ultrashort pulse laser, the pulse laser sent is through frequency-doubling crystal assembly, PCF is entered through PCF coupling mechanism, obtain ultraviolet excess continuous spectrum pulse laser to export, then through ultraviolet narrow band pass filter, obtaining wavelength is λ
1the ultraviolet pulse laser of (namely exciting ozone to produce the optical maser wavelength resonated needed for laser raman effect), then (it is λ that surface is coated with wavelength through beam expanding lens
1anti-reflection film) expand, pierce into from the center pit of the telescopical primary mirror of cassette.Again after the reflection of the silvered reflective face of secondary mirror and primary mirror, focus on remote Laser Focusing point.Laser Focusing point is the intersection point of detection of Corona Discharge region and primary optical axis.
(4) laser resonant Raman analysis
Atmospheric envelope below height 1km, the content of ozone is extremely low and the content of nitrogen monoxide, nitrogen dioxide is relevant with the pollution level of air, and in the place that pollution level is large, content is relatively higher; In the place that pollution level is low, content is very low.The present invention, mainly through detecting the ozone molecule at Laser Focusing point place, is aided with and diagnoses early stage corona discharge the detection of nitrogen monoxide, nitrogen dioxide molecules.
Ozone molecule, nitric oxide molecule, nitrogen dioxide molecules characteristic of correspondence Stokes Raman frequency displacement difference are λ to wavelength
1laser excitation wavelength, the Stokes Raman scattering wavelength that ozone molecule is corresponding is λ
2; Stokes Raman scattering wavelength corresponding to nitrogen dioxide molecules is λ
3; The Stokes Raman scattering wavelength that nitric oxide molecule is corresponding is λ
4.
By to λ
2, λ
3, λ
4the raman spectrum strength analysis of three wavelength, can judge whether Laser Focusing point place has ozone molecule, nitric oxide molecule, nitrogen dioxide molecules, and their concentration.
Wavelength is λ
1the Stokes Raman scattered signal (note: wavelength is greater than λ that excites at Laser Focusing point place of ultraviolet pulse laser
1) successively after primary mirror, secondary mirror, beam splitter reflection to UV, visible light beam splitter, only have the Stokes Raman scattered signal of ultraviolet spectral coverage can through UV, visible light beam splitter.Circular hole coupling mechanism is for eliminating the impact of parasitic light signal, and circular hole coupling mechanism and area array CCD are about the conjugation symmetric design of UV, visible light beam splitter, and the Stokes Raman scattered signal that Laser Focusing point place can be made to excite accurately is coupled into optical fiber.The ultraviolet spectral coverage Stokes Raman scattered signal of coupled into optical fibres enters ultraviolet spectrometer (UVS) and carries out ultraviolet spectrometry, opto-electronic conversion, and the output spectrum signal of ultraviolet spectrometer (UVS) is received by main control analyzing subsystem, carries out uv raman spectroscopy analysis.
Wavelength X
1for exciting ozone to produce the optical maser wavelength resonated needed for laser raman effect, under the exciting of this wavelength pulsed laser, the Stokes Raman scattering wavelength X that ozone molecule is corresponding
2the signal at place will increase 10
4to 10
6doubly, can detect the change of ozone molecule denier concentration.To nitric oxide molecule, nitrogen dioxide molecules, wavelength X
1pulse laser can only inspire conventional stimulated Raman scattering signal, its detection sensitivity is relatively lower, in the present invention, helps out to the detection of nitric oxide molecule, nitrogen dioxide molecules.
(5) corona discharge early diagnosis
Criterion is as follows:
When Laser Focusing point place is without early stage corona discharge, the gas molecule at this place consists of atmospheric molecule composition.The λ that ozone molecule, nitric oxide molecule, nitrogen dioxide molecules are corresponding
2, λ
3, λ
4the Raman line intensity of three wavelength is relatively very little;
When there is early stage corona discharge in Laser Focusing point place, this place produces ozone molecule, nitric oxide molecule, the nitrogen dioxide molecules of denier, compare with Atmospheric composition, Laser Focusing point place ozone molecule, nitric oxide molecule, nitrogen dioxide molecules have an atomic little concentration to increase.Due to resonance Raman effect, λ
2the Raman line intensity at place will have a huge increase, and λ
3, λ
4the Raman line intensity at place will have a small increase.
Criterion accordingly, can judge whether Laser Focusing point place exists early stage corona discharge.
The invention has the beneficial effects as follows, detect light path by visual light imaging and laser resonant Raman spectrum and share and Autofocus Technology, realize the operation of remote visualization spectral detection, accurately can select test point; Adopt the Ultra-Violet Laser wavelength of ozone generation needed for resonance Raman effect, the detection of extremely highly sensitive ozone molecule can be realized, overcome fluorescence interference simultaneously, effectively can detect the Raman spectrum of nitrogen monoxide and nitrogen dioxide.By above-mentioned measure, the high sensitivity diagnosis of early stage atomic light current corona can be realized.
Accompanying drawing explanation
Fig. 1 is present system structure and test philosophy schematic diagram;
In the drawings, 1 is remote laser resonance raman test macro; 2 is circular hole coupling mechanisms; 3 is optical fiber; 4 is ultraviolet spectrometer (UVS)s; 5 is UV, visible light beam splitters; 6 is area array CCD (i.e. charge-coupled image sensors); 7 is drive and imaging output circuit; 8 is display screens; 9 is visual light imaging subsystems; 10 is main control analyzing subsystems; 11 is beam splitters; 12 is ultraviolet source subsystems; 13 is the short laser instruments of the ultrashort arteries and veins of Gao Zhongying; 14 is frequency-doubling crystal assemblies; 15 is PCF (i.e. photonic crystal fiber) coupling mechanisms; 16 is PCF; 17 is ultraviolet narrow band pass filters; 18 is beam expanding lenss; 19 is that rotation and lifting regulates support; 20 is primary mirrors; 21 is cassette telescopes; 22 is secondary mirror electric servomechanisms; 23 is secondary mirrors; 24 is primary optical axis; 25 is Laser Focusing points; 26 is detection of Corona Discharge regions; 27 is extra-high voltage electrical equipments; 28 is time optical axises.
Embodiment
The specific embodiment of the invention 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, under the effect of highfield, in insulation of electrical installation just easily there is shelf depreciation in the part of some weaknesses, when its electric field intensity is greater than ionisation of gas intensity in air, will produce corona discharge.The region that may produce corona discharge is detection of Corona Discharge region 26, generally has near larger geometric buckling part in extra-high voltage electrical equipment.When extra-high voltage electrical equipment 27 exists early stage corona discharge, detection of Corona Discharge region 26 produces having the ozone of denier concentration, nitrogen monoxide and nitrogen dioxide.By to the ozone monitoring of this micro-concentrations and the monitoring to nitrogen monoxide and content of nitrogen dioxide change, early stage corona discharge can be judged.
The present embodiment is performed such:
Extra-high voltage corona discharge early diagnosis system regulates support 19 to form by remote laser resonance raman test macro 1 and rotation and lifting.Remote laser resonance raman test macro 1 is fixedly mounted on rotation and lifting and regulates on support 19, regulate support 19 carry out the lift adjustment of remote laser resonance raman test macro 1 and rotate adjustment by operation rotation and lifting, thus change the direction of primary optical axis 24 neatly.
Remote laser resonance raman test macro 1 is made up of main control analyzing subsystem 10, visual light imaging subsystem 9, ultraviolet source subsystem 12, cassette telescope 21, ultraviolet spectrometer (UVS) 4 and optical accessory.
Visual light imaging subsystem 9 comprises area array CCD 6, driving and imaging output circuit 7 and display screen 8, for the remote visual light imaging to detection of Corona Discharge region 26.
Ultraviolet source subsystem 12 comprises Gao Zhongying ultrashort pulse laser 13, frequency-doubling crystal assembly 14, PCF coupling mechanism 15, PCF 16, ultraviolet narrow band pass filter 17 and beam expanding lens 18, for generation of the pulse laser of a certain wavelength of ultraviolet spectral coverage; Ultraviolet source subsystem 12 and cassette telescope 21 optical axis coincidence, this optical axis is remote laser resonance raman test macro 1 primary optical axis 24.
Gao Zhongying ultrashort pulse laser 13 adopts the diode pumped solid state laser of pulsewidth 20ps, repetition 80MHz, centre wavelength 1064nm in the present embodiment; Frequency-doubling crystal assembly 14 is combined by two pieces of frequency-doubling crystals, and the pulse laser obtaining centre wavelength 266nm exports; PCF coupling mechanism 15 adopts 20 x Microscope Objectives; PCF 16 adopts zero-dispersion wavelength to be the photonic crystal fiber of 266nm, and the ultraviolet excess continuous spectrum pulse laser obtaining 200nm-450nm exports.
Cassette telescope 21, i.e. Cassegrain telescope, its core component is primary mirror 20, secondary mirror 23 and secondary mirror electric servomechanism 22.The wherein silver-plated concave mirror of perforate centered by primary mirror 20, secondary mirror 23 is silver-plated convex reflecting mirror, and secondary mirror electric servomechanism 22 can drive secondary mirror 23 to move forward and backward along primary optical axis 24.Cassette telescope 21 carries out long-range focusing and the collection to resonance Raman spectroscopy signal for the pulse laser exported ultraviolet source subsystem 12.
Optical accessory comprises circular hole coupling mechanism 2, optical fiber 3, UV, visible light beam splitter 5 and beam splitter 11; Beam splitter 5 is placed with primary optical axis 24 one-tenth miter angle, and being coated with wavelength is λ
1the high transmittance film of (namely exciting ozone to produce the optical maser wavelength resonated needed for laser raman effect, is 203.77nm in the present embodiment) and UV, visible light high-reflecting film (being 205nm-760nm in the present embodiment); Secondary optical axis 28 is vertical with primary optical axis 24; UV, visible light beam splitter 5 placement parallel with beam splitter 11 is 45 degree with secondary optical axis 28 angle, and secondary optical axis 28 with UV, visible light beam splitter 5 intersection point is
a; UV, visible light beam splitter 5 is coated with ultraviolet spectral coverage (being 205nm-400nm in the present embodiment) high transmittance film and visible spectral coverage (being 400nm-760nm in the present embodiment) high-reflecting film; Circular hole coupling mechanism 2 is symmetrical about UV, visible light beam splitter 5 conjugation with area array CCD 6, namely
apoint equals to the distance of circular hole coupling mechanism 2
apoint is to the distance of area array CCD 6
d; Circular hole coupling mechanism 2 center-hole diameter is equal with optical fiber 3 external diameter.
Main control analyzing subsystem 10, containing control hardware and host software, for controlling the work of ultraviolet spectrometer (UVS) 4, visual light imaging subsystem 9, Gao Zhongying ultrashort pulse laser 13 and secondary mirror electric servomechanism 22; Receive the output digital image of area array CCD 6 and analyze; Receive the output spectrum signal of ultraviolet spectrometer (UVS) 4 and analyze.
When needs carry out early diagnosis to extra-high voltage corona discharge, detect according to the following steps:
(1) coarse adjustment
Operation rotation and lifting adjustment support 19 carries out the lift adjustment of remote laser resonance raman test macro 1 and rotates adjustment, changes the direction of primary optical axis 24, makes it estimate preliminary aligning detection of Corona Discharge region 26.
Main control analyzing subsystem 10 sends instruction, starts and drives and imaging output circuit 7, area array CCD 6 is started working.Visual light imaging subsystem 9 carries out remote visible spectrum digital imagery by cassette telescope 21 to the object in its field range, the visible spectral coverage light of the 400nm-760nm that object in field range sends reflects through primary mirror 20, secondary mirror 23, beam splitter 11, UV, visible light beam splitter 5 successively, images in area array CCD 6.The digital picture that area array CCD 6 exports, a road is received by main control analyzing subsystem 10, and another road exports simultaneously and shows in real time on display screen 8.
(2) fine tuning and auto-focusing
Observe the realtime graphic on display screen 8, finely tune rotation and lifting simultaneously and regulate support 19, change the direction of primary optical axis 24, detection of Corona Discharge region 26 is accurately presented on display screen 8, even if detection of Corona Discharge region 26 accurate imaging is on area array CCD 6.Now, main control analyzing subsystem 10 receives the digital picture that area array CCD 6 exports, and carries out fast fourier transform in real time, carry out real-time frequency domain analysis subsequently to it.Meanwhile, main control analyzing subsystem 10 sends steering order, starts secondary mirror electric servomechanism 22, drives secondary mirror 23 to move forward and backward along primary optical axis 24.In the process of movement, the real-time frequency domain analysis of real-time digital image is synchronously carried out, when the ratio that the high fdrequency component in frequency domain accounts for total frequency domain distribution is the highest, namely when the digital picture details that area array CCD 6 exports is enriched most, then be in focus state, namely the detection of Corona Discharge region 26 of distant location is overlapped with area array CCD 6 completely by the focus plane of cassette telescope 21 imaging.Now, main control analyzing subsystem 10 sends steering order, stops the work of secondary mirror electric servomechanism 22.
(3) the long-range focusing of ultraviolet pulse laser
Main control analyzing subsystem 10 sends instruction, start Gao Zhongying ultrashort pulse laser 13, the pulse laser of the pulsewidth 20ps sent, repetition 80MHz, centre wavelength 1064nm is through frequency-doubling crystal assembly 14, the pulse laser obtaining centre wavelength 266nm exports, PCF 16 is entered through PCF coupling mechanism 15, the ultraviolet excess continuous spectrum pulse laser obtaining 200nm-450nm exports, then through ultraviolet narrow band pass filter 17, obtaining wavelength is λ
1the ultraviolet pulse laser of (namely exciting ozone to produce the optical maser wavelength resonated needed for laser raman effect, is 203.77nm in the present embodiment), then (it is λ that surface is coated with wavelength through beam expanding lens 18
1anti-reflection film) expand, pierce into from the center pit of the primary mirror 20 of cassette telescope 21.Again after the reflection of the silvered reflective face of secondary mirror 23 and primary mirror 20, focus on remote Laser Focusing point 25.Laser Focusing point 25 is the intersection point of detection of Corona Discharge region 26 and primary optical axis 24.
(4) laser resonant Raman analysis
Atmospheric envelope below height 1km, the content of ozone is extremely low and the content of nitrogen monoxide, nitrogen dioxide is relevant with the pollution level of air, and in the place that pollution level is large, content is relatively higher; In the place that pollution level is low, content is very low.The present invention, mainly through detecting the ozone molecule at Laser Focusing point 25 place, is aided with and diagnoses early stage corona discharge the detection of nitrogen monoxide, nitrogen dioxide molecules.
Ozone molecule, nitric oxide molecule, nitrogen dioxide molecules characteristic of correspondence Stokes Raman frequency displacement difference are λ to wavelength
1laser excitation wavelength, the Stokes Raman scattering wavelength that ozone molecule is corresponding is λ
2(being 208.2nm in the present embodiment); Stokes Raman scattering wavelength corresponding to nitrogen dioxide molecules is λ
3(being 209.41nm in the present embodiment); The Stokes Raman scattering wavelength that nitric oxide molecule is corresponding is λ
4(being 211.88nm in the present embodiment).
By to λ
2, λ
3, λ
4the raman spectrum strength analysis of three wavelength, can judge whether Laser Focusing point 25 place has ozone molecule, nitric oxide molecule, nitrogen dioxide molecules, and their concentration.
Wavelength is λ
1the Stokes Raman scattered signal (note: wavelength is greater than λ that excites at Laser Focusing point 25 place of ultraviolet pulse laser
1) successively after primary mirror 20, secondary mirror 23, beam splitter 11 reflect to UV, visible light beam splitter 5, only have the Stokes Raman scattered signal of ultraviolet spectral coverage (in the present embodiment for 205nm-400nm) can through UV, visible light beam splitter 5.Circular hole coupling mechanism 2 is for eliminating the impact of parasitic light signal, and circular hole coupling mechanism 2 and the conjugation symmetric design of area array CCD 6 about UV, visible light beam splitter 5, the Stokes Raman scattered signal that Laser Focusing point 25 place can be made to excite accurately is coupled into optical fiber 3.The ultraviolet spectral coverage Stokes Raman scattered signal of coupled into optical fibres 3 enters ultraviolet spectrometer (UVS) 4 and carries out ultraviolet spectrometry, opto-electronic conversion, and the output spectrum signal of ultraviolet spectrometer (UVS) 4 is received by main control analyzing subsystem 10, carries out uv raman spectroscopy analysis.
Wavelength X
1for exciting ozone to produce the optical maser wavelength resonated needed for laser raman effect, under the exciting of this wavelength pulsed laser, the Stokes Raman scattering wavelength X that ozone molecule is corresponding
2the signal at place will increase 10
4to 10
6doubly, can detect the change of ozone molecule denier concentration.To nitric oxide molecule, nitrogen dioxide molecules, wavelength X
1pulse laser can only inspire conventional stimulated Raman scattering signal, its detection sensitivity is relatively lower, in the present invention, helps out to the detection of nitric oxide molecule, nitrogen dioxide molecules.
(5) corona discharge early diagnosis
Criterion is as follows:
When Laser Focusing point 25 place is without early stage corona discharge, the gas molecule at this place consists of atmospheric molecule composition.The λ that ozone molecule, nitric oxide molecule, nitrogen dioxide molecules are corresponding
2, λ
3, λ
4the Raman line intensity of three wavelength is relatively very little;
When there is early stage corona discharge in Laser Focusing point 25 place, this place produces ozone molecule, nitric oxide molecule, the nitrogen dioxide molecules of denier, compare with Atmospheric composition, Laser Focusing point 25 place ozone molecule, nitric oxide molecule, nitrogen dioxide molecules have an atomic little concentration to increase.Due to resonance Raman effect, λ
2the Raman line intensity at place will have a huge increase, and λ
3, λ
4the Raman line intensity at place will have a small increase.
Criterion accordingly, can judge whether Laser Focusing point 25 place exists early stage corona discharge.
Claims (7)
1. an extra-high voltage corona discharge early diagnosis system, comprises rotation and lifting and regulates support, it is characterized in that, also comprise remote laser resonance raman test macro;
Described remote laser resonance raman test macro comprises:
Main control analyzing subsystem, containing control hardware and host software, for controlling the work of the electronic Si Fu mechanism of ultraviolet spectrometer (UVS), Gao Zhongying ultrashort pulse laser and secondary mirror; Receive the output digital image of area array CCD and analyze; Receive the output spectrum signal of ultraviolet spectrometer (UVS) and analyze;
Visual light imaging subsystem; For the remote visual light imaging to detection of Corona Discharge region;
Ultraviolet source subsystem; For generation of the pulse laser of a certain wavelength of ultraviolet spectral coverage;
Cassette telescope, the pulse laser for exporting ultraviolet source subsystem carries out long-range focusing and the collection to resonance Raman spectroscopy signal;
Ultraviolet spectrometer (UVS), for carrying out spectral analysis to test point laser resonant Raman scattering signal; And,
Optical accessory.
2. extra-high voltage corona discharge early diagnosis system according to claim 1, is characterized in that described visual light imaging subsystem comprises area array CCD, driving and imaging output circuit and display screen.
3. extra-high voltage corona discharge early diagnosis system according to claim 1, is characterized in that described ultraviolet source subsystem comprises Gao Zhongying ultrashort pulse laser, frequency-doubling crystal assembly, PCF coupling mechanism, PCF, ultraviolet narrow band pass filter and beam expanding lens; Described Gao Zhongying ultrashort pulse laser, the pulse laser sent, through frequency-doubling crystal assembly, enters PCF through PCF coupling mechanism, obtain ultraviolet excess continuous spectrum pulse laser and export, then through ultraviolet narrow band pass filter, obtaining wavelength is λ
1ultraviolet pulse laser, then to expand through beam expanding lens, then through cassette telescope, form remote laser resonance raman test macro primary optical axis.
4. extra-high voltage corona discharge early diagnosis system according to claim 1, is characterized in that,
The telescopical core component of described cassette is primary mirror, secondary mirror and secondary mirror electric servomechanism; The wherein silver-plated concave mirror of perforate centered by primary mirror, secondary mirror is silver-plated convex reflecting mirror, and secondary mirror electric servomechanism can drive secondary mirror to move forward and backward along primary optical axis.
5. extra-high voltage corona discharge early diagnosis system according to claim 1, is characterized in that,
Described optical accessory, comprises circular hole coupling mechanism, optical fiber, UV, visible light beam splitter and beam splitter; Described beam splitter becomes miter angle to place with primary optical axis, being coated with wavelength is λ
1high transmittance film and UV, visible light high-reflecting film; Secondary optical axis is vertical with primary optical axis; The placement parallel with beam splitter of described UV, visible light beam splitter is 45 degree with secondary optical axis included angle, and secondary optical axis and UV, visible light beam splitter intersection point are
a; Described UV, visible light beam splitter is coated with ultraviolet spectral coverage high transmittance film and visible spectral coverage high-reflecting film; Described circular hole coupling mechanism and area array CCD are about UV, visible light beam splitter conjugation symmetry; Described circular hole coupling mechanism center-hole diameter is equal with fibre external diameters; λ
1the optical maser wavelength resonated needed for laser raman effect is produced for exciting ozone.
6. extra-high voltage corona discharge early diagnosis system according to claim 1, it is characterized in that, described remote laser resonance raman test macro is fixedly mounted on rotation and lifting and regulates on support, regulate support carry out the lift adjustment of remote laser resonance raman test macro and rotate adjustment by operation rotation and lifting, thus change the direction of primary optical axis neatly.
7. a laser resonant Raman method for extra-high voltage corona discharge early diagnosis, is characterized in that, said method comprising the steps of:
(1) coarse adjustment
Operation rotation and lifting adjustment support carries out the lift adjustment of remote laser resonance raman test macro and rotates adjustment, changes the direction of primary optical axis, makes it estimate preliminary aligning detection of Corona Discharge region;
Main control analyzing subsystem sends instruction, starts and drives and imaging output circuit, area array CCD is started working; Visual light imaging subsystem carries out remote visible spectrum digital imagery by cassette telescope to the object in its field range, the visible spectral coverage light that object in field range sends through primary mirror, secondary mirror, beam splitter, the reflection of UV, visible light beam splitter, images in area array CCD successively; The digital picture that area array CCD exports, a road is received by main control analyzing subsystem, and another road exports simultaneously and shows in real time on a display screen;
(2) fine tuning and auto-focusing
Observe the realtime graphic on display screen, finely tune rotation and lifting simultaneously and regulate support, change the direction of primary optical axis, detection of Corona Discharge region is accurately shown on a display screen, even if detection of Corona Discharge region accurate imaging is on area array CCD; Now, main control analyzing subsystem receives the digital picture that area array CCD exports, and carries out fast fourier transform in real time, carry out real-time frequency domain analysis subsequently to it; Meanwhile, main control analyzing subsystem sends steering order, starts the electronic Si Fu mechanism of secondary mirror, drives secondary mirror to move forward and backward along primary optical axis; In the process of movement, the real-time frequency domain analysis of real-time digital image is synchronously carried out, when the ratio that the high fdrequency component in frequency domain accounts for total frequency domain distribution is the highest, namely when the digital picture details that area array CCD exports is enriched most, then be in focus state, namely the detection of Corona Discharge region of distant location is overlapped with area array CCD completely by the focus plane of cassette telescope imaging; Now, main control analyzing subsystem sends steering order, stops the work of the electronic Si Fu mechanism of secondary mirror;
(3) the long-range focusing of ultraviolet pulse laser
Main control analyzing subsystem sends instruction, and start Gao Zhongying ultrashort pulse laser, the pulse laser sent is through frequency-doubling crystal assembly, PCF is entered through PCF coupling mechanism, obtain ultraviolet excess continuous spectrum pulse laser to export, then through ultraviolet narrow band pass filter, obtaining wavelength is λ
1ultraviolet pulse laser, then to expand through beam expanding lens, pierce into from the center pit of the telescopical primary mirror of cassette; Again after the reflection of the silvered reflective face of secondary mirror and primary mirror, focus on remote Laser Focusing point; Laser Focusing point is the intersection point of detection of Corona Discharge region and primary optical axis;
(4) laser resonant Raman analysis
By to λ
2, λ
3, λ
4the raman spectrum strength analysis of three wavelength, can judge whether Laser Focusing point place has ozone molecule, nitric oxide molecule, nitrogen dioxide molecules, and their concentration; Wherein, λ
2for Stokes Raman scattering wavelength, λ that ozone molecule is corresponding
3for Stokes Raman scattering wavelength, λ that nitrogen dioxide molecules is corresponding
4it is the Stokes Raman scattering wavelength that nitric oxide molecule is corresponding;
Wavelength is λ
1the Stokes Raman scattered signal that excites at Laser Focusing point place of ultraviolet pulse laser successively after primary mirror, secondary mirror, beam splitter reflection to UV, visible light beam splitter, only have the Stokes Raman scattered signal of ultraviolet spectral coverage can through UV, visible light beam splitter; Ultraviolet spectral coverage Stokes Raman scattered signal through circular hole coupling mechanism coupled into optical fibres enters ultraviolet spectrometer (UVS) and carries out ultraviolet spectrometry, opto-electronic conversion, and the output spectrum signal of ultraviolet spectrometer (UVS) is received by main control analyzing subsystem, carries out uv raman spectroscopy analysis;
Wavelength X
1for exciting ozone to produce the optical maser wavelength resonated needed for laser raman effect, under the exciting of this wavelength pulsed laser, the Stokes Raman scattering wavelength X that ozone molecule is corresponding
2the signal at place will increase 10
4to 10
6doubly, can detect the change of ozone molecule denier concentration; To nitric oxide molecule, nitrogen dioxide molecules, wavelength X
1pulse laser can only inspire conventional stimulated Raman scattering signal, its detection sensitivity is relatively lower, in the present invention, helps out to the detection of nitric oxide molecule, nitrogen dioxide molecules;
(5) corona discharge early diagnosis
Criterion is as follows:
When Laser Focusing point place is without early stage corona discharge, the gas molecule at this place consists of atmospheric molecule composition; The λ that ozone molecule, nitric oxide molecule, nitrogen dioxide molecules are corresponding
2, λ
3, λ
4the Raman line intensity of three wavelength is relatively very little;
When there is early stage corona discharge in Laser Focusing point place, this place produces ozone molecule, nitric oxide molecule, the nitrogen dioxide molecules of denier, compare with Atmospheric composition, Laser Focusing point place ozone molecule, nitric oxide molecule, nitrogen dioxide molecules have an atomic little concentration to increase; Due to resonance Raman effect, λ
2the Raman line intensity at place will have a huge increase, and λ
3, λ
4the Raman line intensity at place will have a small increase;
Criterion accordingly, can judge whether Laser Focusing point place exists early stage corona discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410519572.0A CN104280671B (en) | 2014-10-08 | 2014-10-08 | Laser resonance Raman method for extra-high-voltage corona discharge early diagnosis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410519572.0A CN104280671B (en) | 2014-10-08 | 2014-10-08 | Laser resonance Raman method for extra-high-voltage corona discharge early diagnosis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104280671A true CN104280671A (en) | 2015-01-14 |
| CN104280671B CN104280671B (en) | 2017-02-15 |
Family
ID=52255744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410519572.0A Expired - Fee Related CN104280671B (en) | 2014-10-08 | 2014-10-08 | Laser resonance Raman method for extra-high-voltage corona discharge early diagnosis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104280671B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849257A (en) * | 2015-06-02 | 2015-08-19 | 中国科学院上海技术物理研究所 | Small ultraviolet frequency sweeping laser-based resonance Raman spectrum detection system and method |
| CN105424178A (en) * | 2015-11-06 | 2016-03-23 | 中国科学院长春光学精密机械与物理研究所 | Reflecting-type double-band low-light imaging instrument |
| CN106442467A (en) * | 2016-10-31 | 2017-02-22 | 北京信息科技大学 | Spatial autofocusing laser confocal imaging Raman-spectrum detecting method and device |
| 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 |
| CN106770154A (en) * | 2016-10-31 | 2017-05-31 | 北京信息科技大学 | Space autofocusing laser differential confocal Raman spectroscopic detection method and apparatus |
| CN111133296A (en) * | 2017-09-29 | 2020-05-08 | 株式会社四国综合研究所 | Substance remote determination device and substance remote determination 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 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267713C (en) * | 2001-12-05 | 2006-08-02 | 财团法人工业技术研究院 | Spectral measuring apparatus for infrared spectrum, Raman spectrum and fluorescence spectrum |
| CN101710208B (en) * | 2009-11-24 | 2012-09-19 | 中国科学院长春光学精密机械与物理研究所 | Dual-spectrum corona detection catadioptric panoramic optical system |
| CN102331540B (en) * | 2011-05-26 | 2014-06-04 | 江苏科技大学 | On-line monitoring device and method for corona discharge of ultra-high voltage power transmission line |
| CN103364386B (en) * | 2012-03-27 | 2016-04-06 | 武汉鹰飞拓光电子有限公司 | Deep ultraviolet laser Raman spectrometer |
| CN103105567A (en) * | 2013-02-05 | 2013-05-15 | 宁波工程学院 | Spectroscope type corona ultraviolet detector |
| CN103135042B (en) * | 2013-02-05 | 2015-10-28 | 宁波光之瞳光电科技有限公司 | The corona ultraviolet detector of band upset reflective mirror |
| CN104991175A (en) * | 2013-02-05 | 2015-10-21 | 宁波光之瞳光电科技有限公司 | Single-laser positioning corona UV detector |
| CN103267937B (en) * | 2013-05-24 | 2015-04-22 | 广东电网公司电力科学研究院 | Method for detecting electrical aging of silicone rubber composite insulator |
| CN103743719B (en) * | 2013-12-11 | 2016-08-17 | 中国科学院西安光学精密机械研究所 | Remote in-situ comprehensive test system for substances on surface of planet and atmosphere |
-
2014
- 2014-10-08 CN CN201410519572.0A patent/CN104280671B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| R.IRAWAN ET AL.: "Continuous Monitoring of SF6 Degradation in High Voltage Switchgear using Raman Scattering", 《IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849257A (en) * | 2015-06-02 | 2015-08-19 | 中国科学院上海技术物理研究所 | Small ultraviolet frequency sweeping laser-based resonance Raman spectrum detection system and method |
| 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 |
| CN105424178A (en) * | 2015-11-06 | 2016-03-23 | 中国科学院长春光学精密机械与物理研究所 | Reflecting-type double-band low-light imaging instrument |
| CN106442467A (en) * | 2016-10-31 | 2017-02-22 | 北京信息科技大学 | Spatial autofocusing laser confocal imaging Raman-spectrum detecting method and device |
| CN106770154A (en) * | 2016-10-31 | 2017-05-31 | 北京信息科技大学 | Space autofocusing laser differential confocal Raman spectroscopic detection method and apparatus |
| 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 |
| CN111133296A (en) * | 2017-09-29 | 2020-05-08 | 株式会社四国综合研究所 | Substance remote determination device and substance remote determination method |
| US11592397B2 (en) | 2017-09-29 | 2023-02-28 | Shikoku Research Institute Incorporated | Remote substance identification device and remote substance identification method |
| CN111133296B (en) * | 2017-09-29 | 2023-05-26 | 株式会社四国综合研究所 | Remote substance determining apparatus and remote substance determining 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104280671B (en) | 2017-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104280671B (en) | Laser resonance Raman method for extra-high-voltage corona discharge early diagnosis | |
| CN110071410B (en) | Laser with nonlinear crystal with high quality, stable output beam, long service life and high conversion efficiency | |
| JP6275240B2 (en) | Inspection system using 193 nm laser and 193 nm laser | |
| CN103512868B (en) | A kind of microcell laser probe analytical instrument based on fibre-optic waveguide | |
| CN101551273B (en) | System for automatically measuring spectral characteristics of terahertz wave range | |
| CN105737984A (en) | Terahertz time domain spectral radiation and detecting device | |
| US9075243B2 (en) | Method and system for ultrashort pulse fiber delivery using higher order mode fiber | |
| KR20170066554A (en) | 183nm laser and inspection system | |
| US20210191229A1 (en) | Supercontinuum source, method for generating and emitting a supercontinuum, multiphoton excitation fluorescence microscope, and multiphoton excitation method | |
| TW201349688A (en) | Solid-state laser and inspection system using 193nm laser | |
| CN103219638A (en) | Super-continuum spectrum light source and coherent anti Stokes Raman scattering imaging system | |
| Pupeza et al. | Cavity-enhanced high-harmonic generation with spatially tailored driving fields | |
| US8446587B2 (en) | Flash photolysis system | |
| CN110352538A (en) | 183NM CW laser and checking system | |
| CN110440918B (en) | Space high-resolution optical fiber fluorescence spectrum imaging and positioning method and system | |
| JP2015526741A (en) | Long-wavelength infrared detection and image processing using a long-wavelength infrared light source | |
| US20160299080A1 (en) | Light Measuring Device and Light Measuring Method | |
| He et al. | High-spectral-resolution characterization of broadband high-efficiency reflection gratings | |
| CN105784643B (en) | A kind of devices and methods therefor reducing gas Raman spectrum fluorescence background | |
| CN110687093B (en) | Dual-frequency CARS measuring device and method based on bound-state optical solitons | |
| US8724111B2 (en) | Flash photolysis system | |
| US20180180969A1 (en) | Generation of high energy mid-infrared continuum laser pulses | |
| CN205719255U (en) | Terahertz time-domain spectroscopy radiation and detection device | |
| Kafka et al. | Methods and apparatus for comprehensive characterization of performance attributes and damage thresholds of ultrafast laser optics | |
| KR20190047864A (en) | Optical head for a high resolution detecting apparatus and a high resolution detecting apparatus using ring beam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Chen Liqin Inventor after: Kang Chen Inventor after: Xiao Hongxia Inventor before: Wan Xiong |
|
| 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: 20170215 Termination date: 20201008 |