CN106525977B - A kind of grounded screen imaging device based on transient electromagnetic method - Google Patents
A kind of grounded screen imaging device based on transient electromagnetic method Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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Abstract
A kind of grounded screen imaging device based on transient electromagnetic method.The imaging device is placed in grounded screen overhead surface.The output end of transient excitation generation circuit connects transmitting coil, the region for being sent to underground and covering grounded screen that transmitting coil orients electromagnetic wave, multiple ultrasonic sensors are arranged in grounded screen overhead surface composition ultrasonic reception array, and supersonic array receives the ultrasonic signal of grounded screen generation.The output end of ultrasonic reception array is connected with the input terminal of ultrasonic signal acquisition circuit, and ultrasonic signal acquisition circuit amplifies ultrasonic signal, filters and analog-to-digital conversion process.The output end of ultrasonic signal acquisition circuit is connected with inversion imaging unit, inversion imaging unit is analyzed and processed the ultrasonic signal data received, the variation of acoustic impedance when being propagated in grounded screen by ultrasonic signal, the structure of grounded screen and ambient substance is rebuild, and then accurate structural remodeling is carried out to grounded screen.The high-resolution detection of an ultra shallow layer grounded screen can be achieved in the present invention.
Description
Technical field
The present invention relates to a kind of grounded screen imaging device, in particular to a kind of an ultra shallow layer grounded screen imaging device.
Background technique
Grounded screen is the important component in electric system, grounded screen it is intact whether to the safety and stability of electric system
Property is most important.Since the conductor of grounded screen is embedded in underground, grounding grids are directly contacted with soil, over time, will cause
The heavy corrosion of grounded screen.In addition, can all cause grounded screen under the solder skip, rosin joint and natural external force in work progress act on
It is not intact with damage, cause grounded screen lets out current capacity reduction, influences the security and stability of electric system, endangers person peace
Entirely, huge economic loss is caused, therefore finds electric system grounded screen breakage in advance, releases security risk as early as possible to Guan Chong
It wants.
At present for the detection of grounded screen, Grounding can only be judged indirectly by measuring grounded screen electric parameter
Can, rough fault point is measured, and the specifying informations such as extent of corrosion can not be obtained, it can only be excavated by large area and search grounded screen
Conductor breakpoint and corrosion section.Fault Diagnosis for Grounding Grids method mainly has Electrical network analysis method, electromagnetic field analysis method and electrification at present
Method etc..Electrical network analysis method is to regard grounded screen as resistor network, establishes the corrosion diagnosis equation of grounded screen, passes through solution
Resistance change differentiates the corrosion condition of grounded screen；Electromagnetic field analysis method is by measuring to grounded screen Injection Current
Grounded screen earth's surface Distribution of Magnetic Field, to diagnose the extent of corrosion of grounded screen.
For Electrical network analysis method, grounded screen local corrosion or fracture when surface potential difference vary less, grounded screen node
Between resistance value there is no significant change, be difficult accurately to be sentenced by parameters such as external ground resistance, Potential distribution, contact potentials
It is disconnected.Electromagnetic field analysis method influences the accuracy of measurement vulnerable to external interference, and then influences the judgement of extent of corrosion.The above method
Mainly for the grounded screen of small-scale simple structure, there is larger difficulty when the grounded screen for large-scale complex structure, and
Resistivity image can not be obtained, it is difficult to realize qualitative assessment and the accurate positioning of failure.And traditional electrochemical measuring method
It is difficult to accurately measure earth mat corrosion of metal state.
It, can be quickly in the case where avoiding excavating does not influence electric system normal safe operation in grounded screen and detection process
Accurately test electric parameter relevant to grounded screen, obtains grounded screen range underground medium structure distribution situation, and carry out height
It is particularly significant can accurately to obtain grounded screen state distribution situation for resolution imaging.
Imaging method and system is detected about grounded screen at present, University Of Chongqing has carried out the anti-imaging method of grounded screen electric resistance
Electric current injection mode in electrical impedance imaging measuring principle, circulation measurement method are used for corrosion diagnosis of grounding grid by research.The party
Method provides a completely new thinking for the fault diagnosis of grounded screen, i.e., is intuitively judged by direct imaging.But at it
This method is mentioned in pertinent literature at present can judge the general area of grounding grids corrosion, can't accurately determine corrosion
Specific location can not determine the extent of corrosion of branch, also need to be further improved.
In current document, have scholar explore by geophysical exploration be imaged in transient electromagnetic method method be used for grounded screen
Detection, transient electromagnetic method belong to time domain electromagnetic method, the lower secondary magnetic field generated of research Primary field excitation and the variation of time
Relationship, so that it is determined that the Electrical distribution structure and spatial shape of sub-surface conductors.The it is proposed of transient electromagnetic method is mainly used in oil gas
All various aspects such as exploration, mineral exploration, engineering investigation, environmental survey, archaeology detection, military detection.Electric system grounded screen one
As buried depth it is shallower, belong to an ultra shallow Layer Detection, since traditional transient electromagnetic method need to study the early sign of transient electromagnetic signal,
It is very high along requiring to the shutdown of transmitting signal when carrying out shallow-layer detection, the problem of primary field is separated with secondary field difficulty is existed simultaneously,
It was verified that traditional transient electromagnetic method and incompetent shallow-layer detects, at the same transient electromagnetic method for geophysical exploration to point
The requirement of resolution wants low more than grounded screen imaging.
Summary of the invention
The purpose of the present invention is making up the deficiency of existing grounded screen diagnostic device, a kind of connecing based on transient electromagnetic method is proposed
Earth mat imaging device.The present invention utilizes ultrasonic signal an ultra shallow layer high-resolution imaging feature, can not excavate the feelings not having a power failure
Fast and accurately fault diagnosis is carried out to grounded screen under condition, obtains the information of grounded screen and ambient substance structure, realizes an ultra shallow layer
The high-resolution imaging of grounded screen.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of grounded screen imaging device based on transient electromagnetic method, including it is transient excitation generation circuit, transmitting coil, multiple
Ultrasonic reception array, ultrasonic signal acquisition circuit and the inversion imaging unit of ultrasonic sensor composition.The transition swashs
Encourage the output end connection transmitting coil of generation circuit, the area for being sent to underground and covering grounded screen that transmitting coil orients electromagnetic wave
Domain.Multiple ultrasonic sensors are arranged in above grounded screen, on the ground in the range of the covering of transmitting coil signal, and composition ultrasound connects
Receive array.The ultrasonic signal that ultrasonic reception array received grounded screen generates.The output end of ultrasonic reception array is adopted with ultrasonic signal
The input terminal of collector is connected, and ultrasonic signal acquisition circuit amplifies ultrasonic signal, filters and analog-to-digital conversion process.Ultrasound
The output end of signal acquisition circuit is connect with the input terminal of inversion imaging unit, and inversion imaging unit is to the ultrasonic signal received
Data are analyzed and processed, the variation of acoustic impedance when being propagated in grounded screen by ultrasonic signal, rebuild grounded screen and ambient
The structure of matter, and then quickly accurate inversion imaging is carried out to grounded screen.
The transient excitation generation circuit includes transient excitation signal source, power amplification circuit and the first filter circuit.
Transient excitation signal source carries out signal amplification through power amplification circuit, the output end of power amplification circuit and the first filter circuit
Input terminal is connected, and the output end of filter circuit connects transmitting coil.
The ultrasonic signal acquisition circuit includes wideband low noise amplifier, the second filter circuit and analog-to-digital conversion electricity
Road.The collected ultrasonic signal of supersonic array carries out signal amplification through wideband low noise amplifier, wideband low noise amplifier
Output end is connected with the input terminal of the second filter circuit, the input terminal phase of the output end and analog to digital conversion circuit of the second filter circuit
Even, analog signal is converted into digital signal through analog to digital conversion circuit and is conveyed to inversion imaging unit.
The inversion imaging unit includes processor and image display.Inversion imaging unit is to the ultrasound received
Signal data is analyzed and processed, the variation of acoustic impedance when being propagated in grounded screen by ultrasonic signal, rebuilds grounded screen and week
Enclose the structure of substance.The output end of processor is connected with the input terminal of image display, and described image shows that equipment is finally shown
Show the inversion of three dimensional figure of grounded screen.
Compared with the prior device, the present invention is based on the grounded screen imaging devices of transient electromagnetic method not excavate, not have a power failure
In the case of realize that underground an ultra shallow layer grounded screen and surrounding medium structural images are rebuild.
Detailed description of the invention
The present invention is based on the grounded screen imaging device schematic diagrames of transient electromagnetic method by Fig. 1；
The present invention is based on the grounded screen imaging device schematic diagrams of transient electromagnetic method by Fig. 2.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
As shown in Figure 1 the grounded screen imaging device based on transient electromagnetic method include transient excitation generation circuit, transmitting coil,
Ultrasonic reception array, ultrasonic signal acquisition circuit and the inversion imaging unit of multiple ultrasonic sensor compositions.The wink
The output end for becoming excitation generation circuit connects transmitting coil, and transient excitation generation circuit motivates transmitting coil to generate electromagnetic wave, hair
The region for being sent to underground and covering grounded screen that ray circle orients electromagnetic wave.Grounded screen generates induction under the excitation of electromagnetic wave
Electric current, induced current inspire secondary magnetic field, the induced current in grounded screen electromagnetic wave, secondary magnetic field collective effect under produce
Raw electromagnetic force, inspires ultrasound.Multiple sonic transducers are arranged in the ground above grounded screen in the range of the covering of transmitting coil signal
On face, ultrasonic reception array is formed.The ultrasonic signal that ultrasonic reception array received grounded screen generates.The output of ultrasonic reception array
End is connected with the input terminal of ultrasonic signal acquisition circuit, and ultrasonic signal acquisition circuit amplifies ultrasonic signal, filters and mould
Number conversion process, the output end of ultrasonic signal acquisition circuit is connected with inversion imaging unit, and inversion imaging unit is to receiving
Ultrasonic signal data be analyzed and processed, the variation of acoustic impedance when being propagated in grounded screen by ultrasonic signal, rebuild ground connection
The structure of net and ambient substance, and then quickly accurate inversion imaging is carried out to grounded screen.
As shown in Fig. 2, the transient excitation generation circuit includes transient excitation signal source, power amplification circuit and the first filter
Wave circuit 1, transient excitation generation circuit emit electromagnetic wave to underground by transmitting coil.Connection side between above-mentioned modules
Formula signal transmission form are as follows: the input terminal of the output end connection power amplification circuit of transient excitation signal, power amplification circuit
Output end connects the input terminal of the first filter circuit 1, and the output end of the first filter circuit 1 connects transmitting coil.Transient excitation letter
Number output signal input to power amplification circuit, the output signal of power amplification circuit inputs to the first filter circuit 1, first
Filter circuit 1 outputs signal to transmitting coil, and transmitting coil emits electromagnetic wave to underground, through underground and grounded screen medium
Afterwards, it generates acoustical signal and induction inspires secondary magnetic field.
As shown in Fig. 2, giving ultrasonic signal acquisition circuit, the ultrasonic signal acquisition electricity by ultrasonic reception array received signal
Road includes wideband low noise amplifier, the second filter circuit 2 and analog to digital conversion circuit.Connection type between above-mentioned modules
And signal transmission form are as follows: the input terminal of the output end connection wideband low noise amplifier of ultrasonic reception array, wideband low noise
The output end of amplifier connects the input terminal of the second filter circuit 2, and the output end of the second filter circuit 2 connects analog to digital conversion circuit
Input terminal.The collected ultrasonic signal of supersonic array carries out signal amplification through wideband low noise amplifier, and wideband low noise is put
Big device output signal inputs to the second filter circuit 2, and 2 output signal of the second filter circuit inputs to analog to digital conversion circuit, simulation
Signal is converted into digital signal through analog to digital conversion circuit and is conveyed to inversion imaging unit.
As shown in Fig. 2, the inversion imaging unit includes processor and image display.The output end and figure of processor
As showing that the input terminal of equipment is connected, processor will rebuild the information conveyance of grounded screen to graphic display device, described image
Display equipment finally shows the inversion of three dimensional figure of grounded screen.
Claims (4)
1. a kind of grounded screen imaging device based on transient electromagnetic method, it is characterised in that: the imaging device includes that transition swashs
Ultrasonic reception array, the ultrasonic signal acquisition circuit of generation circuit, transmitting coil, multiple ultrasonic sensors composition are encouraged, and
Inversion imaging unit；The output end of the transient excitation generation circuit connects transmitting coil, and transmitting coil orients electromagnetic wave
The region for being sent to underground and covering grounded screen；Multiple ultrasonic sensors are arranged in transmitting coil signal covering above grounded screen
On ground in range, ultrasonic reception array is formed；The ultrasonic signal that ultrasonic reception array received grounded screen generates；Ultrasonic reception
The output end of array is connected with the input terminal of ultrasonic signal acquisition circuit, and ultrasonic signal acquisition circuit puts ultrasonic signal
Greatly, filtering and analog-to-digital conversion process；The output end of ultrasonic signal acquisition circuit is connect with the input terminal of inversion imaging unit, inverting
Imaging unit is analyzed and processed the ultrasonic signal data received, acoustic impedance when being propagated in grounded screen by ultrasonic signal
Variation, rebuild the structure of grounded screen and ambient substance, and then structural remodeling is carried out to grounded screen.
2. the grounded screen imaging device according to claim 1 based on transient electromagnetic method, it is characterised in that: it is described based on
The grounded screen imaging device of transient electromagnetic method includes transient excitation generation circuit, transmitting coil, ultrasonic reception array, ultrasonic signal
Acquisition Circuit and inversion imaging unit；The transient excitation generation circuit include transient excitation signal source, power amplification circuit and
First filter circuit (1), transient excitation generation circuit emit electromagnetic wave to underground by transmitting coil: transient excitation signal source
Output end connects the input terminal of power amplification circuit, the input of the output end connection the first filter circuit (1) of power amplification circuit
The output end at end, the first filter circuit (1) connects transmitting coil；The output signal input power of transient excitation signal source amplifies electricity
The output signal on road, power amplification circuit inputs the first filter circuit (1), and the first filter circuit (1) outputs signal to emission lines
Circle, transmitting coil emits electromagnetic wave to underground, after underground and grounded screen medium, generates acoustical signal and induction inspires two
Secondary magnetic field.
3. the grounded screen imaging device according to claim 1 based on transient electromagnetic method, it is characterised in that: the ultrasound
Signal acquisition circuit includes wideband low noise amplifier, the second filter circuit (2) and analog to digital conversion circuit: wideband low noise amplification
The output end of the input terminal connection ultrasonic reception array of device, the output end of wideband low noise amplifier connect the second filter circuit
(2) input terminal, the input terminal of the output end connection analog to digital conversion circuit of the second filter circuit (2)；Supersonic array is collected
Ultrasonic signal carries out signal amplification through wideband low noise amplifier, and wideband low noise amplifier output signal is input to the second filtering
Circuit (2), the second filter circuit (2) output signal to analog to digital conversion circuit, and analog signal is converted into counting through analog to digital conversion circuit
Word signal is delivered to inversion imaging unit.
4. the grounded screen imaging device according to claim 1 based on transient electromagnetic method, it is characterised in that: the inverting
Imaging unit includes processor and image display, and inversion imaging unit carries out at analysis the ultrasonic signal data received
The structure of grounded screen and ambient substance is rebuild in reason, the variation of acoustic impedance when being propagated in grounded screen by ultrasonic signal；Processor
Output end be connected with the input terminal of image display, described image shows that equipment finally shows the state of grounded screen.
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| CN201611059391.XA CN106525977B (en) | 2016-11-25 | 2016-11-25 | A kind of grounded screen imaging device based on transient electromagnetic method |
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| CN108387817B (en) * | 2018-01-23 | 2020-10-27 | 中国科学院电工研究所 | Grounding grid fault diagnosis method and device based on current injection type multi-field coupling |
| CN113504570A (en) * | 2021-07-06 | 2021-10-15 | 北京航空航天大学 | Underground space detection device based on three-dimensional focusing magnetic field |
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| CN103869206A (en) * | 2014-03-05 | 2014-06-18 | 中国科学院电工研究所 | Grounding network state detection system for high-frequency pulse inverse scattering imaging |
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| CN205080227U (en) * | 2015-10-27 | 2016-03-09 | 广东亿能电力工程有限公司 | Ground net detecting system |
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| CN103869206A (en) * | 2014-03-05 | 2014-06-18 | 中国科学院电工研究所 | Grounding network state detection system for high-frequency pulse inverse scattering imaging |
| CN105137279A (en) * | 2015-07-16 | 2015-12-09 | 吉林大学 | Grounding grid breakpoint diagnostic method based on transient electromagnetic abnormal ring principle |
| CN205080227U (en) * | 2015-10-27 | 2016-03-09 | 广东亿能电力工程有限公司 | Ground net detecting system |
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