CN103901109A - Phased array ultrasonic detection device and method for inner defects of composite insulator - Google Patents

Phased array ultrasonic detection device and method for inner defects of composite insulator Download PDF

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Publication number
CN103901109A
CN103901109A CN201410129602.7A CN201410129602A CN103901109A CN 103901109 A CN103901109 A CN 103901109A CN 201410129602 A CN201410129602 A CN 201410129602A CN 103901109 A CN103901109 A CN 103901109A
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phased array
composite insulator
unit
probe
detection
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谢从珍
袁超
何子兰
李立浧
张福增
李锐海
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South China University of Technology SCUT
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South China University of Technology SCUT
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Abstract

The invention discloses a phased array ultrasonic detection device for inner defects of a composite insulator. The phased array ultrasonic detection device comprises a phased array probe, a phased array displayer, a phased array system unit and a system main control computer. The invention also discloses a detection method applicable to the phased array ultrasonic detection device for the inner defects of the composite insulator. The detection method comprises the following steps: 1, generating an ultrasonic signal by the phased array probe and generating a reflected ultrasonic signal when the ultrasonic signal meets the defects of the composite insulator; 2, transmitting the reflected ultrasonic signal to the phased array system unit and the system main control computer, and then transmitting data to the phased array system unit and the system main control computer; 3, processing data with the phased array system unit and the system main control computer, and then outputting a phased array scanning image with the phased array displayer; 4, determining sizes, types and positions of the inner defects of the composite insulator. The detection device and the detection method have the advantage of being capable of quickly, accurately and nondestructively detecting the inner defects of the composite insulator.

Description

A kind of phased array ultrasonic detection device and method of composite insulator inherent vice
Technical field
The present invention relates to power equipment detection field, specifically a kind of phased array ultrasonic detection device and method of composite insulator inherent vice.
Background technology
Insulator is being born support transmission line of electricity, isolates transmission line of electricity and other conductive bodies, safeguards the substantial responsibility of safe operation of power system, and whether closely bound up with electric system safety work the excellence of its performance is.Since the 1950's, composite insulator succeeded in developing, little, lightweight with its volume, physical strength is high, anti-pollution characteristic excellence, dielectric strength advantages of higher and being widely used.At present, have in the world and exceeded more than 30 countries and regions at use composite insulator, particularly heavy pollution area.By 2008, the number of China's linked network composite insulator reached 8,000,000.In UHV Transmission Engineering, also adopt in a large number composite insulator.But, when insulator is because manufacturing process etc. is former thereby while causing the problem such as sheath and plug unsticking, sheath internal porosity or tomography, these inner-defects can form great threat to the safe operation of electrical network.The Electric Field Distribution inequality of these disordered insulators, produce electric field distortion at defective locations, the long term of high field intensity can impel the positions such as insulator sheath, plug and gold utensil that shelf depreciation occurs, and makes Insulators Used deteriorated, when serious, can cause insulator fracture, puncture, affect transmission line of electricity safety.Therefore, need badly research how sooner, detect more accurately the method for composite insulator inherent vice.
At present a lot of for the detection method of composite insulator inherent vice, such as Electric Field Distribution detection method, infrared detection method, steep wave test method(s), improvement water-diffusion test method etc.But these methods or sensitivity are low, or complicated and time consumption, there is destructiveness, or testing conditions requires high.Before composite insulator puts into operation, whether insulator exists inherent vice also there is no at present the detection method of standard.At present, have for the lossless detection method of compound substance: ray detection method, magnetic detection method, infiltration detection method, detection method of eddy, sound are sent out detection method, optical detection and ultrasonic Detection Method.The people such as the Gao Ying of Tsing-Hua University adopt ultrasonic pulse-echo method, utilize water for couplant, and composite insulator inherent vice is detected, and can detect the defect that in full skirt, diameter is 3mm.The method adopts water as couplant, and experimentation carries out in water, is unfavorable for Site Detection, and in addition, insulator ducks in drink and may have a negative impact to the insulating property of composite insulating material.South China Science & Engineering University thanks from people such as treasure and has verified the feasibility to composite insulator Inner Defect Testing by conventional ultrasonic Detection Method, can detect the gas hole defect that diameter is 0.5mm, but the testing result of this method is common A sweeps image, intuitive is poor, and unfamiliar testing staff is difficult to size and the type of correct defect recognition.In recent years, phased array ultrasonic detection technical development is rapid, and the Pierre research group of Stanford university of the U.S. has realized the real time three-dimensional imaging technology based on two-dimensional array transducer.Robert Gordon university of Britain has proposed the direct visualization technique of defect based on acousto-optic imaging, and has carried out system and experimental study.At present, phased array supersonic wave technology is mainly used in that biomedicine, pipe detection and ocean pattern are surveyed and the field such as antisubmarine.Phased-array ultrasonic detection technique there is not yet report in the detection of composite insulator inherent vice.
Summary of the invention
Primary and foremost purpose of the present invention is to overcome the shortcoming of prior art with not enough, and a kind of phased array ultrasonic detection device of composite insulator inherent vice is provided, this device can be fast, accurately and nothing detect devastatingly the inherent vice of composite insulator.
The shortcoming that another object of the present invention is to overcome prior art, with not enough, provides a kind of detection method of the phased array ultrasonic detection device that is applied to described composite insulator inherent vice, and this detection method sensing range is wide, and detection efficiency is high.
Primary and foremost purpose of the present invention is achieved through the following technical solutions: a kind of phased array ultrasonic detection device of composite insulator inherent vice, comprising: phased array probe, phased array display instrument, phased array system unit and system master computing machine; Described phased array system unit and system master computing machine are connected with phased array probe by data line, and described control phased array probe is used for sending and received ultrasonic signal; Described phased array probe is receiving after the ultrasonic signal of reflection, by data line, described ultrasonic signal is passed to phased array system unit and system master computing machine; Phased array system unit and system master computing machine, after the ultrasonic signal receiving is carried out to data processing, are delivered to phased array display instrument by data, and described phased array display instrument shows phase-array scanning image;
Described phased array probe is placed on the radial surface of composite insulator sheath in the time detecting, and described phased array probe is in the translation of composite insulator sheath radial surface; Described phased array probe is connected with phased array system unit and system master computing machine; Described phased array system unit and system master computing machine are connected with phased array display instrument; Described phased array probe is made based on acoustic impedance matching principle, and in described acoustic impedance matching principle, the thickness of sound transparent layer equals 1/4 wavelength, makes ultrasonic energy see through to greatest extent phased array probe and enters composite insulator.
According to acoustic wave transmission principle, establishing reflection coefficient is R, and transmission coefficient is T, draws according to energy conservation:
R+T=1, (1)
Ultrasound wave is at wafer medium, sound transparent layer medium and composite insulator sheath Propagation, and for single-frequency ejected wave, its sound intensity transmission coefficient is:
T = 4 2 + ( z 3 z 1 + z 1 z 3 ) cos 2 2 πl λ 2 + ( z 2 2 z 1 z 3 + z 1 z 3 z 2 2 ) sin 2 2 πl λ 2 , - - - ( 2 )
In formula, the acoustic characteristic impedance of wafer, sound transparent layer and composite insulator sheath is respectively z 1, z 2and z 3, z 1≠ z 2≠ z 3; L is the thickness of sound transparent layer medium; λ 2for the wavelength of sound wave in sound transparent layer medium, described λ 2meet:
l = ( 2 n - 1 ) λ 2 4 z 2 = z 1 z 3 , - - - ( 3 )
Have: T=1, wherein, odd-multiple time reach total transmissivity, be quarter-wave total transmissivity; The sound transparent layer thickness of the phased array probe adopting equals 1/4 wavelength;
Described phased array probe size, according to developing with the full skirt spacing of composite insulator, makes phased array probe in the radially mobile scanning of composite insulator jacket surface; In order to make to pop one's head in, focusing effect concentrates on composite insulator sheath, phased array probe wafer quantity is 32, the Center Gap of each wafer is 0.8mm, and the ultrasonic beam depth of focus of transmitting is concentrated in composite insulator sheath, thereby it is more clear to detect image demonstration.
Described composite insulator is detected object, and the transmission by ultrasonic signal in composite insulator sheath inside runs into composite insulator inherent vice and launches, and finally on phased array display instrument, demonstrates scan image.
Described phased array system unit and system master computing machine carry out amplification filtering pre-service to ultrasonic signal, and by pretreated data transmission to main control computer; The startup of described main control computer control phased array ultrasonic detection device, stop, moving, analyze and show ultrasound echo signal and Storage and Processing ultrasound data.Described phased array probe, by detect special probe for composite insulator, coordinates with composite insulator umbrella skirt sheath.
Another object of the present invention is achieved through the following technical solutions: a kind of detection method of the phased array ultrasonic detection device that is applied to described composite insulator inherent vice, comprises the steps:
Step 1, described phased array system unit and system master computer control phased array probe transmit and receive ultrasonic signal, each wafer of phased array system unit and system master computer control phased array probe triggering for generating ultrasonic signal successively, ultrasonic signal enters composite insulator sheath internal communication after stack, when running into composite insulator defect, the ultrasonic signal reflecting just occurs;
The ultrasonic signal of step 2, described reflection is received by phased array probe after stack, be transferred to phased array system unit and system master computing machine by data line, phased array system unit and system master computing machine carry out data pre-service to received signal, and by pretreated data transmission to phased array system unit and system master computing machine;
Step 3, phased array system unit and system master computing machine are exported phase-array scanning image by phased array display instrument after processing deal with data;
Step 4, analyze phase-array scanning image, determine size, type and the particular location of composite insulator inherent vice.
In step 3, after described phased array system unit and system master computer processing data, be based on echo strength method principle by the testing process of phased array display instrument output phase-array scanning image;
In step 1, each wafer of described phased array probe delay emission ultrasonic signal according to certain rules, the described ultrasonic signal of transmitting forms the ultrasonic wave acoustic beam ripple with certain deflection angle after the stack of space.Ultrasonic wave acoustic beam runs into composite insulator defect and reflects, if composite insulator defect is larger, also just stronger at fault location generation reflection supersonic wave, reflection supersonic wave after phased array system unit and system master computing machine are processed by showing on the scan image on phased array display instrument, the color of scan image is more deeply felt and is shown that reflectance ultrasound wave intensity is larger, according to the analysis to phase-array scanning image, can judge size and the position of composite insulator defect.
In step 1, each wafer of described phased array probe excitation ultrasound ripple in order, the wave front of formation has deflection and focussing force, can be at few movement or the radial extension of scanning composite insulator sheath mobile probe in the situation that not.
Principle of work of the present invention: the present invention utilizes One-dimension Phased Array probe, adopts machine oil as the couplant between probe and composite insulator, and composite insulator inherent vice is entered to phased array sector scanning.Judge size and the position of the inherent vice of composite insulator according to the two dimensional image of sector display.The process flow diagram that phased-array ultrasonic is surveyed as shown in Figure 4.The workflow of Ultrasonic Detection is: the crystal-vibration-chip of ultrasonic transmitter sends ultrasound wave, ultrasound wave is propagated between probe and medium, also different in the character of the different echoes of the propagation property of medium and defect according to ultrasound wave, show the internal feature of test specimen by the echoed signal receiving, thereby come size and the type of defect recognition by two-dimensional ultrasonic image.The sector display schematic diagram of composite insulator Inner Defect Testing as shown in Figure 3.
The know-why of institute of the present invention foundation: 1, phased array ultrasonic detection principle: ultrasound wave refers to the vibration shear wave of frequency higher than 20kHZ, is generally used for the normally frequency band of 0.5~10MHZ of frequency of Non-Destructive Testing.Ultrasound wave, in the time of Propagation, runs into another kind of medium, can reflect in interface, reflection and mode conversion (be that shear wave becomes compressional wave, compressional wave becomes shear wave).Part wave energy is reflected back toward original medium, is called as reflection wave, i.e. echo; Another part energy, through interface, resumes and broadcasts at another medium relaying, is called as refraction wave.The degree that sound wave is reflected at interface mainly determines by the acoustic impedance of two media (product of the density of the velocity of propagation of sound wave in medium and medium), and acoustic impedance difference is larger, and reflection strength is stronger.When Ultrasonic Detection, if need to carry out imaging to a certain region in object, must carry out acoustic beam scanning.Phased array imaging is by controlling the excitation of each array element and the time delay of received pulse in array energy transducer, thereby the phase relation when changing each array element transmitting (or acceptance) sound wave and arriving certain point in (or from) object, realize the variation in focus point and acoustic beam orientation, thereby it is synthetic to complete phased wave beam, form image scanning, principle as shown in Figure 1.Common ultrasonic pulse echo scanning, transducer is made up of single crystal-vibration-chip.The transducer of phased array supersonic designs based on Huygens' principle, form array by multiple separate piezoelectric chips, each wafer is called a unit, excite by certain sequential electricity consumption subsystem controls, make the ultrasound wave stack of each unit transmitting in array form a new wave front, as shown in Figure 2 a.Equally, in the receiving course of reflection wave, by certain sequential control receiving element, and it is synthetic to carry out signal, then will synthesize result and show with certain forms, as shown in Figure 2 b.Phased array supersonic imaging can be carried out linear scan, sector display and swept-volume imaging, but which kind of shows it is all that the information of being swept by A converts.2, echo strength method principle; Each array element of phase array transducer delay emission wavelet according to certain rules, these wavelets form the acoustic beam wave front with certain deflection angle after the stack of space, within the scope of tested material certain angle, be fan-shaped distribution, utilize this fan-shaped beam to carry out defect scanning to measured material.The wave beam compound direction of sector display is emitting shape, so lateral resolution changes to some extent in different distance.Change the size of time delay interval, can carry out sector display in a certain region, scanning scope depends on delay time and probe parameter.The schematic diagram of sector display as shown in Figure 3.Ultrasound wave runs into defect generation echo reflection, if the acoustic impedance of defect and tested material differs larger, at fault location, stronger reflection can occur, and demonstrates and be reflected back wave intensity on scan image.According to the size of reflection echo intensity and position, can judge size and the position of defect.3, acoustic impedance matching principle: doing ultrasound examination when experiment, the acoustic coupling on phased array probe and tested test specimen surface is very important, it determining acoustic energy enter into composite bed number.If there is not being coupled, the acoustic energy having more than 80% is reflected back, therefore effective coupling must be set and guarantee that more than 70% acoustic energy can enter into tested test specimen.
The present invention has following advantage and effect with respect to prior art:
1. adopt the method for phased-array ultrasonic detection composite insulator inherent vice, overcome the deficiency of conventional insulators detection side's method.For example Electric Field Distribution detection method complicated and time consumption, steep wave test method(s) has destructiveness, improves water-diffusion test method testing conditions and requires high and can produce certain destructiveness to detected test specimen.Phased array ultrasonic detection process operation is simple, without injury, is a kind of Non-Destructive Testing to tested test specimen.
2. phased array detection technique has advantages of that it is incomparable compared with conventional Ultrasound detection: 1. detectability is stronger, and defect detection rate is larger.The transverse resolution of Ultrasonic Detection is subject to the impact of the width of acoustic beam, and the wider transverse resolution of beam width is lower, otherwise transverse resolution is higher.The acoustic beam that traditional beam width of popping one's head in will compare ultrasonic phase array is much wide.Ultrasonic phase array detection technique not only can realize the deflection of acoustic beam, can also realize the focusing of acoustic beam simultaneously, by electronic system, phased array instrument is arranged to different time delay rules and can control the beam characteristics exciting, and can focus on different depth and places.Phased array probe can be selected suitable beam angle and depth of focus in conjunction with workpiece profile and detection faces for the possible position of defect, type, complete comprehensive scanning of complex-shaped workpieces, obtain the detected image that resolution is high, improve the particularly Detection capability of degree of depth defect of defect, can not realize sound beam focusing or can realize sound beam focusing and cannot realize this difficult problem of variable focus although overcome conventional Ultrasound pulse echo method.2. detect more comprehensively, flexibly and fast.In phased array probe, the selected wafer exciting can be realized high precision, quick, comprehensive profile scanning.Traditional ultrasonic inspection probe due to sound beam direction is fixing cannot deflection, scan from different directions to guarantee to scan position and be completely covered and be unlikely undetected so will constantly change various probes or mobile probe in the time detecting complex contour workpiece material, in reality detection, operability is not strong.And while detecting with ultrasonic phased array, can realize by local wafer unit combination the control of wave beam deflection angle, shape, direction and the depth of focus, can guarantee to realize high-velocity scanning and detection under detection sensitivity prerequisite higher, not travelling workpiece, mobile probe or few mobile probe just can not scan the regional of the larger workpiece of thickness and outer shape complex part, and testing process is more faster than tradition probe, also can realize real-time electronic scanning and dynamic focusing, these advantages are that conventional ultrasound detection method is incomparable.3. the fan sweeping image of phased array is two dimensional image, and compared with conventional ultrasonic wave detected image, defect image is more directly perceived, accurate.Phased array detects deflection and the focusing of launching acoustic beam by control, make ultrasound wave can arrive each subtlety of tested object, process delay and focusing, change aperture, apodization processing after the signal that reception reflects, signal is carried out image reconstruction and just can be obtained the acoustic imaging in a certain cross section of tested material, form intuitively, high-resolution, the defect image that is easy to observation analysis.Ultrasonic phased array detects can also be by acoustic beam synthetic technology by kinoforms such as synthetic A sweep image C scanning, D scanning, S scannings, thereby demonstrate bottom surface projection and defective locations (degree of depth) image of ultrasonic beam in tested material, greatly improved defect location, quantitatively, accuracy qualitatively.2, phased array supersonic wave technology is applied to detects composite insulator inherent vice first, solved that composite insulator dispatches from the factory and the quality problems of emerged in operation, and provide effective ways for the detection of operation composite insulator for a long time.The quality of insulator is determining the safe and reliable operation of transmission line of electricity, and along with the raising that transmission line of electricity safe and reliable operation requires, the reliable and stable operation of insulator also needs correspondingly to promote.This detection technique can solve the examination problem of composite insulator inherent vice, improves the operation stability of electric system.At field of non destructive testing, this technology will have application prospect very widely.
3, develop the phased array probe that specific complex insulator detects.By optimizing probe size, sound transparent layer Thickness Design, wafer quantity, probe can be positioned between composite insulator umbrella skirt sheath just, its radial zone is carried out to the scanning of maximum magnitude, focusing effect concentrates on composite insulator sheath inside simultaneously, signal to noise ratio (S/N ratio) and the resolution of the detected image improving, reduced noise jamming.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the deflection of phased-array ultrasonic.
Fig. 2 a is the transmitting schematic diagram of phased array acoustic beam.
Fig. 2 b is the reception schematic diagram of phased array acoustic beam.
Fig. 3 is the schematic diagram of sector display.
Fig. 4 is phased-array ultrasonic overhaul flow chart.
Fig. 5 is phased array probe structural drawing.
Fig. 6 is that phased array supersonic instrument detects composite insulator schematic diagram.
In figure: 1 is wafer; 2 is composite insulator inherent vice; 3 is phased array probe; 4 is phased array probe delay block and diaphragm; 5 is couplant; 6 is composite insulator sheath; 7 is plug; 8 is sound lens; 9 is acoustic coupling layer; 10 is acoustic damping piece; 11 is wire; 12 is composite insulator umbrella skirt; 13 is ball-and-socket; 14 is bulb; 15 is phased array system unit and system master computing machine; 16 is phased array display instrument.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Fig. 1, Fig. 3, Fig. 5 and Fig. 6, a kind of phased array ultrasonic detection device of composite insulator inherent vice, comprising: phased array probe 3, phased array display instrument 16, phased array system unit and system master computing machine 15; Described phased array system unit and system master computing machine 15 are connected with phased array probe by data line, and described control phased array probe 3 is for sending and received ultrasonic signal; Described phased array probe 3 is receiving after the ultrasonic signal of reflection, by data line, described ultrasonic signal is passed to phased array system unit and system master computing machine 15; Phased array system unit and system master computing machine 15, after the ultrasonic signal receiving is carried out to data processing, are delivered to phased array display instrument 16 by data, and described phased array display instrument 16 shows phase-array scanning image;
Described phased array probe 3 is placed on the radial surface of composite insulator sheath in the time detecting, and described phased array probe 3 is in the translation of composite insulator sheath radial surface; Described phased array probe is connected with phased array system unit and system master computing machine 15; Phased array system unit and system master computing machine 15 are connected with phased array display instrument.
As shown in Figure 4, a kind of detection method of the phased array ultrasonic detection device that is applied to described composite insulator inherent vice, utilize acoustic beam deflection and focusing on composite insulator is detected, specifically comprise the steps:
1, the preparation of phased array probe 3.The size of phased array probe 3 is determined according to the size of 12 of measured composite insulator umbrella skirts.Common detection probe, because size is larger, is used for detecting large-area plate material.But composite insulator umbrella skirt 12 is complex-shaped, and spacing is little, common detection probe size is larger, cannot be placed between two composite insulator umbrella skirts 12, can not agree with completely with composite insulator sheath 6.So when composite insulator defect 2 is detected, need to use the phased array probe 3 of special customization, phased array probe 3 can be placed between two composite insulator umbrella skirts 12 just, and fit completely in the surface of phased array probe 3 by couplant 5 and the surface of composite insulator sheath 6.
2, the design parameter detecting for composite insulator inherent vice 2 by the input of preset software on phased array supersonic display instrument 16 on demand: the speed 1060m/s that ultrasound wave is propagated in composite insulator sheath 6, deflection angle-40 of ultrasonic signal °-+40 °, the detection frequency 2.5MHz of phased array probe 3, the depth of focus 5mm of ultrasonic signal, wafer 1 quantity 32 of activation, the type of phase-array scanning are the stepping angle of fan sweeping, fan sweeping.
3, after completing parameter setting, remove the dirt that is detected thing surface and probe turnover zone, and at composite insulator sheath 6 surfaces and probe turnover zone daubing coupling agent 5, couplant is selected machine oil, mass density 0.92 × 10 3kg/m 3, velocity of sound 1390m/s, specific acoustic impedance 1.28MPas/m.
4, phased array probe 3 is placed on composite insulator sheath 6 by couplant 5, makes the surperficial close contact of phased array probe 3 and composite insulator sheath 6 as far as possible.
5, at the slow mobile phased array probe 3 in the surface of composite insulator sheath 6, thereby the different parts of composite insulator sheath 6 is scanned to detection.
6,, in testing process, phased array ultrasonic detection instrument can synchronously demonstrate detected image.If composite insulator inherent vice 2 detected, can in detected image, show, as shown in Figure 3.By the analysis to detected image, can determine size, type and the particular location of composite insulator inherent vice 2.
7, in testing process, phased array system unit and the automatic calculating time delay of system master computing machine 15, and according to the depth of focus of the ultrasonic signal of step 2 kind of input, control the contained wafer 1 of phased array probe 3 and trigger successively, produce ultrasonic signal.
8, the ultrasonic signal that multiple wafers 1 are launched enters the internal communication of composite insulator sheath 6 after stack, runs into composite insulator inherent vice 2 and just reflects.The ultrasonic signal of reflection is received by phased array probe 3 again after superposeing.
9, phased array probe 3 receives after the ultrasonic signal of reflection, and data are reached to phased array system unit and system master computing machine 15, and phased array system unit and system master computing machine 15 carry out data processing to the reflection ultrasonic signal receiving.。
10, after phased array system unit and system master computing machine 15 deal with data, export phase-array scanning image by phased array display instrument 16.
11, analyze phase-array scanning image, determine size, type and the particular location of composite insulator inherent vice 2.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.

Claims (8)

1. a phased array ultrasonic detection device for composite insulator inherent vice, is characterized in that, comprising: phased array probe, phased array display instrument and phased array system unit and system master computing machine; Described phased array system unit and system master computing machine are connected with phased array probe by data line, and described control phased array probe is used for sending and received ultrasonic signal; Described phased array probe is receiving after the ultrasonic signal of reflection, by data line, described ultrasonic signal is passed to phased array system unit and system master computing machine; Described phased array system unit and system master computing machine, after the ultrasonic signal receiving is carried out to data processing, are delivered to phased array display instrument by data, and described phased array display instrument shows phase-array scanning image;
Described phased array probe is placed on the radial surface of composite insulator sheath in the time detecting, and described phased array probe is in the translation of composite insulator sheath radial surface; Described phased array probe is connected with phased array system unit and system master computing machine; Phased array system unit and system master computing machine are connected with phased array display instrument.
2. the phased array ultrasonic detection device of composite insulator inherent vice as claimed in claim 1, it is characterized in that, described phased array probe is made based on acoustic impedance matching principle, in described acoustic impedance matching principle, the thickness of sound transparent layer equals 1/4 wavelength, makes ultrasonic energy see through to greatest extent phased array probe and enters composite insulator;
If reflection coefficient is R, transmission coefficient is T, draws according to energy conservation:
R+T=1, (1)
Ultrasound wave is at wafer medium, sound transparent layer medium and composite insulator sheath Propagation, and for single-frequency ejected wave, its sound intensity transmission coefficient is:
T = 4 2 + ( z 3 z 1 + z 1 z 3 ) cos 2 2 πl λ 2 + ( z 2 2 z 1 z 3 + z 1 z 3 z 2 2 ) sin 2 2 πl λ 2 , - - - ( 2 )
In formula, the acoustic characteristic impedance of wafer, sound transparent layer and composite insulator sheath is respectively z 1, z 2and z 3, z 1≠ z 2≠ z 3; L is the thickness of sound transparent layer medium; λ 2for the wavelength of sound wave in sound transparent layer medium, described λ 2meet:
l = ( 2 n - 1 ) λ 2 4 z 2 = z 1 z 3 , - - - ( 3 )
Have: T=1, wherein, odd-multiple time reach total transmissivity, be quarter-wave total transmissivity; The sound transparent layer thickness of the phased array probe adopting equals 1/4 wavelength;
Described phased array probe size, according to developing with the full skirt spacing of composite insulator, makes phased array probe in the radially mobile scanning of composite insulator jacket surface; Described phased array probe concentrates on composite insulator sheath for the ultrasonic beam depth of focus that makes transmitting, thereby detects image.
3. the phased array ultrasonic detection device of composite insulator inherent vice as claimed in claim 1, it is characterized in that, described composite insulator is detected object, transmission by ultrasonic signal in composite insulator sheath inside, run into composite insulator inherent vice and launch, finally on phased array display instrument, demonstrate scan image.
4. the phased array ultrasonic detection device of composite insulator inherent vice as claimed in claim 1, it is characterized in that, described phased array system unit and system master computing machine carry out amplification filtering pre-service to ultrasonic signal, and by pretreated data transmission to main control computer; The startup of described phased array system unit and system master computing machine phased array ultrasonic detection device, stop, moving, analyze and show ultrasound echo signal and Storage and Processing ultrasound data; The wafer quantity of described phased array probe is 32, and the Center Gap of each wafer is 0.8mm.
5. a detection method that is applied to the phased array ultrasonic detection device of composite insulator inherent vice claimed in claim 1, is characterized in that, comprises the steps:
Step 1, described phased array system unit and system master computer control phased array probe transmit and receive ultrasonic signal, each wafer of phased array system unit and system master computer control phased array probe triggering for generating ultrasonic signal successively, ultrasonic signal enters composite insulator sheath internal communication after stack, when running into composite insulator defect, the ultrasonic signal reflecting just occurs;
The ultrasonic signal of step 2, described reflection is received by phased array probe after stack, be transferred to phased array system unit and system master computing machine by data line, phased array system unit and system master computing machine carry out data pre-service to received signal, and by pretreated data transmission to phased array system unit and system master computing machine;
Step 3, phased array system unit and system master computing machine are exported phase-array scanning image by phased array display instrument after processing deal with data;
Step 4, analyze phase-array scanning image, determine size, type and the particular location of composite insulator inherent vice.
6. the detection method as described in right 5, is characterized in that, in step 3, after described phased array system unit and system master computer processing data, is based on echo strength method principle by the testing process of phased array display instrument output phase-array scanning image.
7. the detection method as described in right 5, it is characterized in that, in step 1, each wafer of described phased array probe delay emission ultrasonic signal according to certain rules, the described ultrasonic signal of transmitting forms the ultrasonic wave acoustic beam ripple with certain deflection angle after the stack of space.
8. the detection method as described in right 5, it is characterized in that, in step 1, each wafer of described phased array probe excitation ultrasound ripple in order, the wave front forming has deflection and focussing force, the radial extension of scanning composite insulator sheath in the situation that of mobile probe not.
CN201410129602.7A 2014-03-31 2014-03-31 Phased array ultrasonic detection device and method for inner defects of composite insulator Pending CN103901109A (en)

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CN104458907A (en) * 2014-10-15 2015-03-25 南方电网科学研究院有限责任公司 Ultrasonic detection method and automatic rotary flaw detection device of composite insulator
CN107478560A (en) * 2017-08-23 2017-12-15 成都本华清博科技有限公司 It is a kind of to verify that water pass through the method that sheath enters composite electric insulator core bar sheath interface
CN109541032A (en) * 2018-12-03 2019-03-29 国网上海市电力公司 A kind of chip components and parts detection method and system
CN109828030A (en) * 2019-03-28 2019-05-31 深圳中凯剑无损检测设备科技有限公司 A kind of reflector pattern extraction system and extracting method based on sound field characteristics
CN110320272A (en) * 2019-06-17 2019-10-11 华南理工大学 A kind of detection method of three support insulators center conductor and epoxy part faying face
CN110531233A (en) * 2019-09-25 2019-12-03 国网陕西省电力公司电力科学研究院 GIS disc insulator surface state detection device and method based on ultrasonic wave injection
CN111227820A (en) * 2020-02-21 2020-06-05 孙磊 Fetal heart detection sensor matrix of multidimensional channel sensor and fetal heart detection equipment
CN111265240A (en) * 2020-02-21 2020-06-12 孙磊 Fetal heart monitor and fetal heart measuring method
CN111426919A (en) * 2020-04-08 2020-07-17 国网山西省电力公司电力科学研究院 Basin-type insulator detection device based on laser-induced ultrasound

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CN104458907A (en) * 2014-10-15 2015-03-25 南方电网科学研究院有限责任公司 Ultrasonic detection method and automatic rotary flaw detection device of composite insulator
CN104458911B (en) * 2014-12-16 2017-01-25 中国科学院工程热物理研究所 Defect type determination method for ultrasonic testing of wind turbine blades
CN104458911A (en) * 2014-12-16 2015-03-25 中国科学院工程热物理研究所 Defect type determination method for ultrasonic testing of wind turbine blades
CN107478560B (en) * 2017-08-23 2020-07-28 成都本华清博科技有限公司 Method for verifying whether water can enter composite insulator mandrel sheath interface through sheath
CN107478560A (en) * 2017-08-23 2017-12-15 成都本华清博科技有限公司 It is a kind of to verify that water pass through the method that sheath enters composite electric insulator core bar sheath interface
CN109541032A (en) * 2018-12-03 2019-03-29 国网上海市电力公司 A kind of chip components and parts detection method and system
CN109828030A (en) * 2019-03-28 2019-05-31 深圳中凯剑无损检测设备科技有限公司 A kind of reflector pattern extraction system and extracting method based on sound field characteristics
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CN110320272A (en) * 2019-06-17 2019-10-11 华南理工大学 A kind of detection method of three support insulators center conductor and epoxy part faying face
CN110531233A (en) * 2019-09-25 2019-12-03 国网陕西省电力公司电力科学研究院 GIS disc insulator surface state detection device and method based on ultrasonic wave injection
CN111227820A (en) * 2020-02-21 2020-06-05 孙磊 Fetal heart detection sensor matrix of multidimensional channel sensor and fetal heart detection equipment
CN111265240A (en) * 2020-02-21 2020-06-12 孙磊 Fetal heart monitor and fetal heart measuring method
CN111426919A (en) * 2020-04-08 2020-07-17 国网山西省电力公司电力科学研究院 Basin-type insulator detection device based on laser-induced ultrasound

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