CN107796781A - Propagation characteristic detecting system and its detection method of a kind of THz wave in electric power polymer composite - Google Patents
Propagation characteristic detecting system and its detection method of a kind of THz wave in electric power polymer composite Download PDFInfo
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- CN107796781A CN107796781A CN201710961352.7A CN201710961352A CN107796781A CN 107796781 A CN107796781 A CN 107796781A CN 201710961352 A CN201710961352 A CN 201710961352A CN 107796781 A CN107796781 A CN 107796781A
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- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 229920000642 polymer Polymers 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 230000003111 delayed effect Effects 0.000 claims abstract description 20
- 239000006185 dispersion Substances 0.000 claims abstract description 14
- 238000013519 translation Methods 0.000 claims abstract description 9
- 230000003595 spectral effect Effects 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000007704 transition Effects 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000000605 extraction Methods 0.000 claims abstract description 4
- 239000013307 optical fiber Substances 0.000 claims description 17
- 238000001228 spectrum Methods 0.000 claims description 8
- 229910001218 Gallium arsenide Inorganic materials 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 3
- 238000000407 epitaxy Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 claims description 3
- 229920002521 macromolecule Polymers 0.000 claims description 2
- 210000001367 artery Anatomy 0.000 claims 1
- 210000003462 vein Anatomy 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000001131 transforming effect Effects 0.000 abstract description 2
- 239000012212 insulator Substances 0.000 description 15
- 230000007547 defect Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides propagation characteristic detecting system and its detection method of a kind of THz wave in electric power polymer composite, the propagation characteristic detecting system includes ultrafast ti∶sapphire laser femto-second laser, beam splitter, transition plane mirror, grating dispersion advance compensator, delayed sweep control unit, photoconducting antenna THz transmitters, electric power polymer composite sample, photoconducting antenna THz receivers, two-dimentional machinery scans translation stage and computer control and data collecting system, go out the THz spectral informations of electric power polymer composite sample with the THz signal extractions before and after electric power polymer composite sample effect by measuring.The present invention provides a kind of lossless rapid detection system in far field and method of Terahertz Technology inner-defect inside all kinds of compound inslation parts in power system, marches toward comprehensive Composite for power transmission and transforming equipment and lays a good foundation.
Description
Technical field
The invention belongs to technical field of electric power detection, more particularly to a kind of THz wave is in electric power polymer composite
Propagation characteristic detecting system and its detection method.
Background technology
Greatly develop global energy internet transmission of electricity background under, compound inslation turn into extra-high voltage alternating current-direct current equipment,
The main flow selection of transmission line of electricity, in each voltage class, full Composite transformer station, the engineering design and application of complete compound cross-arm circuit
Also more and more important proportion will be occupied in power network., should be true before project of transmitting and converting electricity promotes the use of composite insulating material equipment
Experiment is sampled after protecting all kinds of complex insulation product arrivals, and carries out severe quality examination.But present situation is, in compound inslation part
Portion's hidden defects detectability serious loss, it is unfavorable for quality management and control and operation management before such product large area networks.
Due to manufacturing process, many complex insulation products are (such as：Composite bushing, composite post insulator, compound horizontal stroke
Load etc.) it is internal there is a variety of interfaces, such as full skirt and sheath, sheath and plug (insulating cylinder), plug (insulating cylinder) and termination gold
Belong to the interface between annex and the glass fibre and impregnating resin of plug (insulating cylinder).If in operation, there is an interface
There is gap, weak link can be formed in insulating part, particularly when moisture or moisture enter in gap, the insulating properties of insulating part
It can drastically decline, cause electric discharge and breakdown fault.
But due to the special nature of compound inslation part, traditional X ray, ultrasonic wave are because the reason such as decay or scattering
The defects of slight air gap, crackle of its inside, can not accurately be detected, cause much to put into operation with defective part of appliance
I.e. there occurs the failures such as breakdown, fracture in the short time afterwards.By taking composite insulator as an example, the resistance to steep wave punching of composite insulator for many years
It is to weigh one of good and bad important symbol of interior insulator performance to hit performance.The steep wave impact test of existing suspended compound insulator
Be according to the regulation of version IEC61109 standards in 1992, mainly for new networking insulator be segmented apply steepness 1000~
1500kV/us surge voltage, the steepness are far below porcelain, 4000~5000kV/us of glass insulator steep wave test level, and
The lightning surge that composite insulator is born with porcelain, glass insulator has no essential difference.The research institutions such as North China DianKeYuan
Once it is too low to composite insulator steep wave parameter value level to query, it is believed that it is only effective to major defect, is not easy to detect
The defects of interior insulator is more small.From the point of view of the situation that Jiangsu Province is tested composite insulator steep wave, seldom existing steep
Substandard product is verified under scale standard.It is exhausted to the interior insulator for running certain time limit to properly increase steep wave experiment steepness reinforcement
Edge performance undoubtedly has tightened up examination ability, but has research to also indicate that too high steepness is also possible to cause normal insulation
The damage of interior insulation.On the other hand, both at home and abroad for transformer station's Hollow Compound sleeve pipe, compound cross-arm internal flaw dispatching from the factory or
Arrival scene, not yet proposes effective Inner Defect Testing means, can not check whether exist in transport, installation process
Hidden damage.Accordingly it is contemplated that the quality of production and running situation of insulator are detected using new nondestructiving detecting means, as early as possible
It was found that potential faults, avoid threatening power grid security because insulator breaks down.
The content of the invention
The present invention provide a kind of Terahertz Technology in power system inside all kinds of compound inslation parts inner-defect it is remote
The lossless rapid detection system in field and method, march toward comprehensive Composite for power transmission and transforming equipment from now on and lay a good foundation.
The present invention is specially a kind of propagation characteristic detecting system of THz wave in electric power polymer composite, described
Propagation characteristic detecting system include ultrafast ti∶sapphire laser femto-second laser, beam splitter, transition plane mirror, grating dispersion advance compensator,
Delayed sweep control unit, photoconducting antenna THz transmitters, electric power polymer composite sample, photoconducting antenna THz receivers,
Two-dimentional machinery scans translation stage and computer control and data collecting system, the grating dispersion advance compensator pass through optical fiber and institute
The connection of delayed sweep control unit is stated, the delayed sweep control unit is also sent out with the photoconducting antenna THz respectively by optical fiber
Emitter connects with the photoconducting antenna THz receivers, and the computer control and data collecting system pass through data and signal control
Line processed realizes two-way communication with the delayed sweep control unit and two-dimentional machinery scanning translation stage respectively；It is described to propagate spy
Property detecting system be used to determine time domain THz wave amplitudes, time delay, its Euclidean distance and object's position to be measured and chi with reference curve
Very little corresponding relation, determine amplitude, phase and the corresponding relation of to be measured object composition of the THz wave frequencies spectrum at specific frequency.
The ultrafast ti∶sapphire laser femto-second laser is the femto-second lasers of Vitesse 800, and it exports femtosecond light pulsewidth
100fs, centre wavelength 800nm, repetition rate 80MHz, mean power reach 1W.
The photoconducting antenna THz transmitters and the photoconducting antenna THz receivers are used using Picometrix companies
T-Ray5000 systems, it utilizes optical fiber transmission femtosecond laser, it is not necessary to which complicated optics, light path are realized and freely changed.
The present invention also provides a kind of inspection of propagation characteristic detecting system of THz wave in electric power polymer composite
Survey method, the detection method comprise the following steps：
Step (1)：Femtosecond laser is incident to the progress of grating dispersion advance compensator by two-stage beam splitter and transition plane mirror
Positive GVD precompensation；
Step (2)：Polarization-maintaining single-mode fiber is coupled into by the femtosecond laser of dispersion pre-compensation, and is transferred to via optical fiber
Delayed sweep control unit；
Step (3)：Femtosecond laser is pump light and detection light by beam splitting inside delayed sweep control unit；
Step (4)：Pump light is transmitted the GaAs light guides day for photoconducting antenna THz transmitters, exciting low-temperature epitaxy by optical fiber
The pulse THz spokes that temporal duration is 5ps, spectral range is 0.02~2THz, mean power is 100nW are given off after line
Penetrate；
Step (5)：The delay line that detection light passes through in delayed sweep control unit is transmitted to photoconducting antenna THz by optical fiber to be connect
Device is received, excites GaAs photoconducting antennas to realize the instantaneous electric field ionization meter to THz radiation；
Step (6)：The time delay that deferred mount changes two-beam is adjusted, scanning obtains the time domain waveform of THz pulse；
Step (7)：Go out electric power height with the THz signal extractions before and after electric power polymer composite sample effect by measuring
The THz spectral informations of molecular composite material sample；
Step (8)：Translation stage is scanned by two-dimentional machinery THz spectrum, which are examined, to be realized to sample progress two-dimensional grid form scanning
Survey；
Step (9)：The reflected terahertz hereby impulse waveform of electric power polymer composite sample each point is measured, by Fourier
Conversion obtains corresponding frequency spectrum.
Brief description of the drawings
Fig. 1 is a kind of structure of propagation characteristic detecting system of the THz wave of the present invention in electric power polymer composite
Schematic diagram.
Embodiment
A kind of propagation characteristic of the THz wave of the present invention in electric power polymer composite is detected below in conjunction with the accompanying drawings
The embodiment of system elaborates.
As shown in figure 1, the propagation characteristic detecting system of the present invention includes ultrafast ti∶sapphire laser femto-second laser, beam splitter, mistake
Cross level crossing, grating dispersion advance compensator, delayed sweep control unit, photoconducting antenna THz transmitters, electric power macromolecule composite wood
Expect sample, photoconducting antenna THz receivers, two-dimentional machinery scanning translation stage and computer control and data collecting system, the light
Grid dispersion pre-compensation device is connected by optical fiber with the delayed sweep control unit, and the delayed sweep control unit also passes through light
Fibre is connected with the photoconducting antenna THz transmitters and the photoconducting antenna THz receivers respectively, the computer control and data
Acquisition system is translated with the delayed sweep control unit and two-dimentional machinery scanning respectively by data and signal control line
Platform realizes two-way communication；The propagation characteristic detecting system is used to determine time domain THz wave amplitudes, time delay, itself and reference curve
The corresponding relation of Euclidean distance and object's position to be measured and size, determine amplitude of the THz wave frequencies spectrum at specific frequency, phase with
The corresponding relation of object composition to be measured.
The ultrafast ti∶sapphire laser femto-second laser is the femto-second lasers of Vitesse 800, and it exports femtosecond light pulsewidth
100fs, centre wavelength 800nm, repetition rate 80MHz, mean power reach 1W.
The photoconducting antenna THz transmitters and the photoconducting antenna THz receivers are used using Picometrix companies
T-Ray5000 systems, it utilizes optical fiber transmission femtosecond laser, it is not necessary to which complicated optics, light path are realized and freely changed.
The present invention also provides a kind of inspection of propagation characteristic detecting system of THz wave in electric power polymer composite
Survey method, the detection method comprise the following steps：
Step (1)：Femtosecond laser is incident to the progress of grating dispersion advance compensator by two-stage beam splitter and transition plane mirror
Positive GVD precompensation；
Step (2)：Polarization-maintaining single-mode fiber is coupled into by the femtosecond laser of dispersion pre-compensation, and is transferred to via optical fiber
Delayed sweep control unit；
Step (3)：Femtosecond laser is pump light and detection light by beam splitting inside delayed sweep control unit；
Step (4)：Pump light is transmitted the GaAs light guides day for photoconducting antenna THz transmitters, exciting low-temperature epitaxy by optical fiber
The pulse THz spokes that temporal duration is 5ps, spectral range is 0.02~2THz, mean power is 100nW are given off after line
Penetrate；
Step (5)：The delay line that detection light passes through in delayed sweep control unit is transmitted to photoconducting antenna THz by optical fiber to be connect
Device is received, excites GaAs photoconducting antennas to realize the instantaneous electric field ionization meter to THz radiation；
Step (6)：The time delay that deferred mount changes two-beam is adjusted, scanning obtains the time domain waveform of THz pulse；
Step (7)：Go out electric power height with the THz signal extractions before and after electric power polymer composite sample effect by measuring
The THz spectral informations of molecular composite material sample；
Step (8)：Translation stage is scanned by two-dimentional machinery THz spectrum, which are examined, to be realized to sample progress two-dimensional grid form scanning
Survey；
Step (9)：The reflected terahertz hereby impulse waveform of electric power polymer composite sample each point is measured, by Fourier
Conversion obtains corresponding frequency spectrum.
Finally it should be noted that only illustrating technical scheme rather than its limitations with reference to above-described embodiment.Institute
The those of ordinary skill in category field is it is to be understood that those skilled in the art can repair to the embodiment of the present invention
Change or equivalent substitution, but these modifications or change are among pending claims are applied for.
Claims (4)
- A kind of 1. propagation characteristic detecting system of THz wave in electric power polymer composite, it is characterised in that the biography Broadcasting Characteristics Detection system includes ultrafast ti∶sapphire laser femto-second laser, beam splitter, transition plane mirror, grating dispersion advance compensator, prolongs Slow scan control unit, photoconducting antenna THz transmitters, electric power polymer composite sample, photoconducting antenna THz receivers, two Tie up mechanical scanning translation stage and computer control and data collecting system, the grating dispersion advance compensator by optical fiber with it is described Delayed sweep control unit is connected, and the delayed sweep control unit is also launched with the photoconducting antenna THz respectively by optical fiber Device is connected with the photoconducting antenna THz receivers, and the computer control and data collecting system are controlled by data and signal Line realizes two-way communication with the delayed sweep control unit and two-dimentional machinery scanning translation stage respectively；The propagation characteristic Detecting system is used to determine time domain THz wave amplitudes, time delay, its Euclidean distance and object's position to be measured and size with reference curve Corresponding relation, determine amplitude of the THz wave frequencies spectrum at specific frequency, phase and the corresponding relation of object to be measured composition.
- A kind of 2. propagation characteristic detection system of the THz wave according to claim 1 in electric power polymer composite System, it is characterised in that the ultrafast ti∶sapphire laser femto-second laser is the femto-second lasers of Vitesse 800, and it exports femtosecond light arteries and veins Wide 100fs, centre wavelength 800nm, repetition rate 80MHz, mean power reach 1W.
- A kind of 3. propagation characteristic detection system of the THz wave according to claim 2 in electric power polymer composite System, it is characterised in that the photoconducting antenna THz transmitters and the photoconducting antenna THz receivers use Picometrix The systems of T-Ray 5000 of company, it utilizes optical fiber transmission femtosecond laser, it is not necessary to which complicated optics, light path, which is realized, freely to be turned Change.
- 4. propagation characteristic of the THz wave in electric power polymer composite according to any one in claim 1-3 The detection method of detecting system, it is characterised in that the detection method comprises the following steps：Step (1)：Femtosecond laser is incident to grating dispersion advance compensator by two-stage beam splitter and transition plane mirror and carries out positive group Velocity dispersion pre-compensates for；Step (2)：Polarization-maintaining single-mode fiber is coupled into by the femtosecond laser of dispersion pre-compensation, and delay is transferred to via optical fiber Scan control unit；Step (3)：Femtosecond laser is pump light and detection light by beam splitting inside delayed sweep control unit；Step (4)：After pump light is transmitted the GaAs photoconducting antennas for photoconducting antenna THz transmitters, exciting low-temperature epitaxy by optical fiber Give off the pulse THz radiation that temporal duration is 5ps, spectral range is 0.02~2THz, mean power is 100nW；Step (5)：The delay line that detection light passes through in delayed sweep control unit is transmitted to photoconducting antenna THz by optical fiber to be received Device, GaAs photoconducting antennas are excited to realize the instantaneous electric field ionization meter to THz radiation；Step (6)：The time delay that deferred mount changes two-beam is adjusted, scanning obtains the time domain waveform of THz pulse；Step (7)：Go out electric power macromolecule with the THz signal extractions before and after electric power polymer composite sample effect by measuring The THz spectral informations of composite sample；Step (8)：Translation stage is scanned by two-dimentional machinery THz spectral detections are realized to sample progress two-dimensional grid form scanning；Step (9)：The reflected terahertz hereby impulse waveform of electric power polymer composite sample each point is measured, by Fourier transform Obtain corresponding frequency spectrum.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108666A (en) * | 2019-06-20 | 2019-08-09 | 云南电网有限责任公司电力科学研究院 | Insulating oil moisture content detection device |
| CN112180392A (en) * | 2019-07-02 | 2021-01-05 | 中国科学技术大学 | Atmospheric composition detection laser radar based on dispersion gating |
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| CN104568819A (en) * | 2015-01-15 | 2015-04-29 | 南开大学 | All-fiber transmission reflection integrated terahertz time-domain spectroscopy system |
| CN104833650A (en) * | 2015-05-29 | 2015-08-12 | 南开大学 | Pulse terahertz time-domain spectral system with single photoconductive antenna and detection method thereof |
| CN207379914U (en) * | 2017-10-17 | 2018-05-18 | 国网江苏省电力公司盐城供电公司 | A kind of propagation characteristic detecting system of THz wave in electric power polymer composite |
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2017
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| JP2008122278A (en) * | 2006-11-14 | 2008-05-29 | Hitachi Ltd | Terahertz spectral diffraction/imaging apparatus |
| CN104568819A (en) * | 2015-01-15 | 2015-04-29 | 南开大学 | All-fiber transmission reflection integrated terahertz time-domain spectroscopy system |
| CN104833650A (en) * | 2015-05-29 | 2015-08-12 | 南开大学 | Pulse terahertz time-domain spectral system with single photoconductive antenna and detection method thereof |
| CN207379914U (en) * | 2017-10-17 | 2018-05-18 | 国网江苏省电力公司盐城供电公司 | A kind of propagation characteristic detecting system of THz wave in electric power polymer composite |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108666A (en) * | 2019-06-20 | 2019-08-09 | 云南电网有限责任公司电力科学研究院 | Insulating oil moisture content detection device |
| CN112180392A (en) * | 2019-07-02 | 2021-01-05 | 中国科学技术大学 | Atmospheric composition detection laser radar based on dispersion gating |
| CN112180392B (en) * | 2019-07-02 | 2024-05-17 | 中国科学技术大学 | Atmospheric component detection laser radar based on dispersion gating |
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