CN110174364B - Composite insulator nondestructive testing device and method based on Lambert beer law - Google Patents
Composite insulator nondestructive testing device and method based on Lambert beer law Download PDFInfo
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- CN110174364B CN110174364B CN201910416769.4A CN201910416769A CN110174364B CN 110174364 B CN110174364 B CN 110174364B CN 201910416769 A CN201910416769 A CN 201910416769A CN 110174364 B CN110174364 B CN 110174364B
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- deuterium lamp
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- 239000012212 insulator Substances 0.000 title claims abstract description 50
- 239000002131 composite material Substances 0.000 title claims abstract description 46
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 235000013405 beer Nutrition 0.000 title claims abstract description 12
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims abstract description 23
- 229910052805 deuterium Inorganic materials 0.000 claims abstract description 23
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 11
- 229910002808 Si–O–Si Inorganic materials 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims description 11
- 238000002211 ultraviolet spectrum Methods 0.000 claims description 11
- 238000001228 spectrum Methods 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000032683 aging Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract description 2
- 238000010998 test method Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- -1 methyl vinyl siloxane Chemical class 0.000 description 1
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 description 1
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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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
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
Abstract
The invention discloses a composite insulator nondestructive testing device and method based on Lambert beer law, comprising the following steps: deuterium lamp, diaphragm,The device comprises a light splitting groove, an interferometer, a sample and a photomultiplier; a deuterium lamp for generating an ultraviolet beam; on the irradiation path of the ultraviolet light beam, a diaphragm, a light splitting groove, an interferometer, a sample and a photomultiplier are arranged in sequence. The invention is based on Lambert-Beer law and utilizes Si-O-Si and Si-CH in the composite insulator material3After the radicals absorb ultraviolet light, electron energy level transition in the radicals generates different absorption spectra, and the aging degree of the composite insulator is judged according to the absorption spectra. The invention solves the problem that the structure of the insulator needs to be damaged in the related test at present, realizes the nondestructive test of the composite insulator, provides a new test method and has great practical application value.
Description
Technical Field
The invention belongs to the technical field of insulator detection, and particularly relates to a nondestructive detection device and a nondestructive detection method for a composite insulator.
Background
With the development of ultra-high voltage and other power transmission projects in China, a large number of composite insulators need to be operated in a net hanging mode in a high-altitude environment, and in high-altitude areas, the ultraviolet radiation intensity is high, and the total radiation amount of the composite insulators is far higher than that of other areas. The high-temperature vulcanized silicone rubber serving as a main raw material of the composite insulator is an organic high polymer material, and is accelerated to age under the condition of strong ultraviolet radiation, mechanical properties and electrical properties of the composite insulator are reduced after aging, even major accidents such as flashover and string dropping are caused, and the safe and stable operation of a power grid is seriously threatened. Therefore, it is particularly important to detect the ultraviolet resistance of the composite insulator, which is related to the safe and stable operation of the power transmission line.
At present, for the research of the ultraviolet aging performance of the composite insulator, a series of researches are mostly carried out by cutting a required sample from a composite insulator shed operated by a net by using a slicer, or the required sample is cut from a new insulator shed produced by a manufacturer, and after an ultraviolet accelerated aging test, the ultraviolet aging performance of the composite insulating material is judged by carrying out related tests such as a scanning electron microscope, Fourier infrared and the like. The method can cause unrecoverable damage to the composite insulator, and the tested composite insulator structure is damaged and cannot be operated on the power transmission line again in a net hanging mode.
Therefore, it is important to provide a device and a method for nondestructive testing of a composite insulator, and the ultraviolet aging degree of the composite insulator can be judged without destroying the structure of the composite insulator.
Disclosure of Invention
The invention aims to provide a composite insulator nondestructive testing device and method based on the Lambert beer law so as to solve the technical problem. The invention can detect the aging degree of the composite insulator which runs in a net hanging manner on the premise of not damaging the structure of the composite insulator, and solves the problem that the structure of the insulator needs to be damaged in the related test at present.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite insulator nondestructive testing device based on Lambert beer's law includes:
a deuterium lamp, a diaphragm, a light splitting groove, an interferometer, a sample and a photomultiplier;
a deuterium lamp for generating an ultraviolet beam; on the irradiation path of the ultraviolet light beam, a diaphragm, a light splitting groove, an interferometer, a sample and a photomultiplier are arranged in sequence.
Further, the diaphragm is used for limiting the ultraviolet light beam emitted by the deuterium lamp, and the deuterium lamp emits a continuous ultraviolet spectrum which is restricted to a light beam with a radius of 20 mu m.
Further, the light splitting groove is used for decomposing the ultraviolet light beam irradiated on the surface of the light splitting groove according to the set wavelength.
Further, an interferometer for converting the light beam emitted from the spectroscopic groove into interference light.
Further, the test sample is a composite insulator to be detected; and the photomultiplier is used for converting the photon signals reflected by the surface of the sample into electric signals.
Further, the device also comprises a signal processing circuit which is used for processing the electric signal output by the photomultiplier and extracting Si-O-Si and Si-CH in the sample3Absorption spectrum after radical absorption of ultraviolet light.
A composite insulator nondestructive testing method based on Lambert beer law comprises the following steps:
step 1), the deuterium lamp emits a continuous ultraviolet spectrum with the wavelength of 180-400 nm, the spectrum is constrained through a diaphragm, and the continuous ultraviolet spectrum emitted by the deuterium lamp 1 is constrained into a light beam with the radius of 20 microns;
step 2), reflecting the ultraviolet light beam penetrating through the diaphragm to a light splitting groove through a movable mirror, decomposing the continuous ultraviolet spectrum into ultraviolet rays with different wavelengths by using the light splitting groove 4, converting the ultraviolet rays with different wavelengths into interference ultraviolet light through an interferometer in a time-sharing manner through a time-sharing control circuit, and sequentially irradiating the interference ultraviolet light on a sample to be tested;
step 3), Si-O-Si and Si-CH in the sample3After the group absorbs ultraviolet radiation, the electron energy level is transited to generate an absorption spectrum, and an ultraviolet photon spectrum reflected from the surface of the sample is received by the photomultiplier and converted into an electric signal;
and 4) extracting the electric signals generated by the photomultiplier to obtain the absorption spectrum of the composite insulator.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an insulator aging degree detection device and method based on Lambert-Beer law. The device and the method can judge the aging performance of the composite insulator without damaging the structure of the composite insulator, and do not influence the later-stage net hanging operation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a composite insulator nondestructive testing device based on lambert beer's law.
FIG. 2 is a schematic flow chart of the composite insulator nondestructive testing method based on Lambert beer's law.
In the figure, 1, a deuterium lamp, 2, a diaphragm, 3, a moving mirror, 4, a light splitting groove, 5, an interferometer, 6, a sample, 7, a photomultiplier and 8, a signal processing circuit.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Referring to fig. 1, the present invention provides a composite insulator nondestructive testing device based on Lambert-Beer law, including a deuterium lamp 1, a diaphragm 2, a moving mirror 3, a light splitting tank 4, an interferometer 5, a sample 6, a photomultiplier tube 7 and a signal processing circuit 8.
Deuterium lamp 1 for generating an ultraviolet beam; on the irradiation path of the ultraviolet beam, a diaphragm 2, a spectroscopic slot 4, an interferometer 5, a sample 6, and a photomultiplier 7 are arranged in this order.
The diaphragm 2 is used for limiting the ultraviolet light beam emitted by the deuterium lamp 1 and constraining the continuous ultraviolet light spectrum emitted by the deuterium lamp 1 into a light beam with the radius of 20 mu m; the two diaphragms 2 are arranged to form two beams of ultraviolet light so as to form interference light in the subsequent process;
a plurality of movable mirrors 3 for reflecting the ultraviolet light to a desired plane; the two movable mirrors 3 are arranged on the paths of the two ultraviolet light beams, and the two movable mirrors 3 of the two ultraviolet light beam mirrors reflect and enter the surface of the light splitting groove 4;
a light splitting groove 4 for splitting the light beam emitted from the diaphragm 2 according to a desired wavelength;
an interferometer 5 for converting the light beam emitted from the spectroscopic slot 4 into interference light; the other set of movable mirrors 3 is arranged at an interference light outlet of the interferometer 5 and is used for reflecting interference light emitted by the interferometer 5 to the surface of the sample 6;
sample 6, which is a composite insulator umbrella skirt to be detected;
the photomultiplier 7 is used for converting weak photon signals of ultraviolet photon spectrums reflected by the surface of the sample 6 into electric signals and transmitting the electric signals to the signal processing circuit 8;
and the signal processing circuit 8 is used for processing the electric signals output by the photomultiplier tube 7 to obtain required detection data, and further obtaining the detection condition of the composite insulator.
The invention provides a composite insulator nondestructive testing method based on Lambert-Beer law, which comprises the following steps,
step 1), emitting a continuous ultraviolet spectrum with the wavelength of 180-400 nm by a deuterium lamp 1 in the system, and constraining the spectrum by a diaphragm 2, wherein the continuous ultraviolet spectrum emitted by the deuterium lamp 1 is constrained into a light beam with the radius of 20 mu m;
step 2), reflecting the ultraviolet light beam penetrating through the diaphragm 2 to a light splitting groove 4 through a movable mirror 3, decomposing the continuous ultraviolet spectrum into ultraviolet rays with different wavelengths by using the light splitting groove 4, converting the ultraviolet rays with different wavelengths into interference ultraviolet light through an interferometer 5 in a time-sharing way through a time-sharing control circuit, and reflecting the interference ultraviolet light through the movable mirror 3 to irradiate on a sample 6 to be measured in sequence;
step 3), Si-O-Si and Si-CH in sample 63After the group absorbs ultraviolet radiation, the electron energy level is transited to generate an absorption spectrum, and the ultraviolet photon spectrum reflected by the surface of the sample has very weak energy;
and 4), the photomultiplier 7 performs mathematical processing on the converted electric signals through a signal processing circuit 8 to obtain a final detection result.
The principle of the invention is as follows: the composite insulator mainly comprises methyl vinyl siloxane (PDMS) and white carbon black (SiO)2) And aluminum hydroxide (ATH), and mainly comprises Si-O-Si, Si-CH3The absorption peaks of the groups and functional bonds are reflected by their content in the sample, while Si-O-Si and Si-CH3The characteristic peak value absorption value of the group can well reflect the aging condition of the composite insulator. Based on the chemical analysis of the composite insulator, the invention utilizes Si-O-Si and Si-CH in the composite insulator material based on the Lambert-Beer law3After the radical absorbs ultraviolet light, the radical is formed by Si-O-Si and Si-CH3Electron energy level transitions in the radical produce different absorption spectra. And judging the aging degree of the composite insulator according to the absorption spectrum.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (3)
1. The utility model provides a composite insulator nondestructive test device based on lambert beer's law which characterized in that includes:
the device comprises a deuterium lamp (1), a diaphragm (2), a light splitting groove (4), an interferometer (5), a sample (6) and a photomultiplier (7);
a deuterium lamp (1) for generating an ultraviolet light beam; a diaphragm (2), a light splitting groove (4), an interferometer (5), a sample (6) and a photomultiplier (7) are sequentially arranged on an irradiation path of the ultraviolet light beam;
the deuterium lamp (1) is used for emitting a continuous ultraviolet spectrum with the wavelength of 180-400 nm;
the diaphragm (2) is used for limiting the ultraviolet light beam emitted by the deuterium lamp (1) and constraining the continuous ultraviolet light spectrum emitted by the deuterium lamp (1) into a light beam with the radius of 20 mu m;
the light splitting groove (4) is used for decomposing the ultraviolet light beam irradiated on the surface of the light splitting groove (4) according to a set wavelength;
an interferometer (5) for converting the light beam emitted from the spectroscopic slot (4) into interference light;
the test sample (6) is a composite insulator to be detected; the photomultiplier (7) is used for converting photon signals reflected by the surface of the sample (6) into electric signals;
the device also comprises a signal processing circuit (8) which is used for processing the electric signals output by the photomultiplier (7) and extracting Si-O-Si and Si-CH in the sample (6)3Absorption spectrum after radical absorption of ultraviolet light.
2. The composite insulator nondestructive testing device based on the lambert beer law as claimed in claim 1, wherein there are two diaphragms (2) for limiting the ultraviolet light beam emitted by the deuterium lamp (1) to form two beams.
3. A composite insulator nondestructive testing method based on lambert beer's law, characterized in that, based on the composite insulator nondestructive testing device based on lambert beer's law of claim 1 or 2, including the following steps:
step 1), emitting a continuous ultraviolet spectrum with the wavelength of 180-400 nm by a deuterium lamp (1), constraining the spectrum through a diaphragm (2), and constraining the continuous ultraviolet spectrum emitted by the deuterium lamp (1) into a light beam with the radius of 20 microns;
step 2), reflecting the ultraviolet light beam penetrating through the diaphragm (2) to a light splitting groove (4) through a movable mirror, decomposing the continuous ultraviolet spectrum into ultraviolet rays with different wavelengths by using the light splitting groove (4), converting the ultraviolet rays with different wavelengths into interference ultraviolet light through an interferometer (5) in a time-sharing way through a time-sharing control circuit, and sequentially irradiating the interference ultraviolet light on a sample to be tested (6);
step 3), Si-O-Si and Si-CH in the sample (6)3After the group absorbs ultraviolet radiation, the electron energy level is transited to generate an absorption spectrum, and an ultraviolet photon spectrum reflected from the surface of the sample (6) is received by the photomultiplier tube (7) and converted into an electric signal;
and step 4), extracting the electric signals generated by the photomultiplier (7) to obtain the absorption spectrum of the composite insulator.
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| CN102230893A (en) * | 2011-03-28 | 2011-11-02 | 广西电网公司电力科学研究院 | Quantitative identification method of composite insulator umbrella skirt aging |
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