CN103869206A - Grounding network state detection system for high-frequency pulse inverse scattering imaging - Google Patents
Grounding network state detection system for high-frequency pulse inverse scattering imaging Download PDFInfo
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Abstract
The invention provides a grounding network state detection system based on high-frequency pulse inverse scattering imaging. The detection system is arranged on the ground above a grounding network. The output end of a high-frequency pulse emitting system is connected with an emitting antenna, a plurality of receiving antennas are arranged in a signal coverage range of the emitting antenna, and a receiving array is formed. The receiving antenna is connected to the input end of an electromagnetic receiving system, and the output end of the electromagnetic receiving system is connected to the input end of a data interpretation and imaging system. High-frequency pulse signals output by the high-frequency pulse emitting system are input into the emitting antenna, the signals are directionally sent to the underground grounding network by the emitting antenna, the sent signals are spread between underground media and the grounding network, the receiving array formed by a plurality of receiving antennas receives signals containing information of the underground grounding network, the signals of the receiving antenna array are conveyed to an electromagnetic receiving system, and output signals of the electromagnetic receiving system are input to the data interpretation and imaging system to be subjected to data interpretation and image rebuilding.
Description
Technical field
The present invention relates to a kind of grounded screen condition detecting system based on high-frequency impulse back scattering imaging technique.
Background technology
Grounded screen is playing an important role aspect power system security reliability service, and most important to staff's personal safety and the normal operation of various electrical equipments in protection station, its ground connection performance is subject to the attention of production run department always.At present, galvanized steel is the earth conductor material that domestic substation ground network is comparatively commonly used, through operation for a long time, in rainy and coastland, along with the increase of tenure of use, easily corrode, according to the power difference of soil corrosivity, the annual corrosion rate of earth conductor in soil between 2.0mm-8.0mm not etc., in addition, the bad welding of earth mat in the middle of work progress, rosin joint, solder skip and from the corrosion of soil, the electrodynamic action of earth short circuit current etc., can cause between the each equal pressure zone of earth mat or down conductor and all have the bad trouble spot of electrical connection between pressure zone, inevitably cause the security performance of earth mat to be seriously damaged, originally the well-designed grounded screen of process is because structure is changed, can not provide effective current by pass for fault current and lightning current, personal safety and device security are subject to serious threat.
Once occur because grounded screen fault causes power system accident, consequence is comparatively serious.Short-circuit current flows into earth mat by down conductor, earth mat fault and fast earial drainage will cause neutral point in electric power system generation drift potential to raise, simultaneously ground potential rise, brings serious threat to power transformation operation personnel's personal safety.And counterattack superpotential and cable skin circulation cause the insulating capacity of secondary device to be destroyed, high pressure is scurried into pulpit simultaneously, thereby because of its monitoring and opertaing device misoperation or tripping expansion accident scope, causes huge economic loss and social influence.In China, because of ground net corrosion, accident that the electric system that the defect such as fracture causes occurs happens occasionally, each accident all can cause huge economic loss, and the direct economic loss at every turn causing is all in extremely several ten million yuan, millions of units.
China buries underground during five sixties at present grounded screen, the conductor of ubiquity earthing device and ground lead corrosion phenomenon.All the time, the common method of understanding ground net corrosion and breakpoint in engineering is all generally by virtue of experience, according to the operation time limit of the soda acid degree of the residing soil environment of earth mat and earth mat, probably estimate the corrosion condition of earth mat by feat of the practical experience in all multiple-projects, then the heavy corrosion that may exist is jeopardized to safe earth mat and have a power failure and sample excavation.Such way does not have specific aim, expends a large amount of manpower, material resources and financial resources, can not fundamentally avoid the generation of power system accident.
Since entering the new century, along with China's rapid economic development, voltage class of electric power system improves constantly, power system capacity constantly expands, and earth-fault current also increases considerably.In addition, the intelligent degree of transformer station is more and more higher, but advanced watch-dog antijamming capability is also more weak, therefore the performance of earthing device is had higher requirement.Normally just must make regular check in order to ensure grounded screen dependable performance.
Grounded screen is carried out to defect diagonsis, both there is broad perspectives, wanted the state of total evaluation grounded screen, there is again microcosmic, be accurate location defect position, need to diagnose local corrosion situation or breakpoint location under grounded screen microcosmic by the quantity of state of macroscopic measurement grounded screen.And the general area of grounded screen is very large, be deeply buried in soil, direct-detection difficulty is large, workload is large, local defect is little for the impact of grounded screen global feature parameter, the difficult parameters that entirety is measured grounded screen is with reflection local feature, at present not high for the various diagnostic method accuracys of grounding net defect, sensitivity is lower.
In order to realize the diagnosing malfunction to grounded screen in the situation that not having a power failure and not excavating, domestic scholars has been carried out a lot of work.In recent years, fault diagnosis technology has a lot of new methods and corresponding measuring system, and research theory is also constantly perfect, has basically formed large amperometry technology, grounded screen node analysis technology, electromagnetic field analysis technology, on-line corrosion monitoring technology etc.For the detection of grounded screen, can only indirectly judge Grounding performance by measuring grounded screen electric parameter at present, measure trouble spot roughly, and can not specifically draw extent of corrosion etc., search grounded screen conductor breakpoint and corrosion section by dig on a wide area.Electric network method is under strong shielding or diffusing effect, simultaneously due to mutual resistance effect between grounded screen, two of grounded screen grid conductors can touch internodal resistance value often significantly not to be changed, when fracture appears in grounded screen conductor part, the poor variation of surface potential is very little, is difficult to only accurately judge by parameters such as external ground resistance, step voltage, Potential distribution, contact electricitys while there is corrosion cracking therefore grounded screen is local.Before the direct application of grounding net of existing electromagnetic method corrodes, network topology and each boundary condition are introduced Maxwell equation, and the surface potential that obtains grounded screen distributes or Distribution of Magnetic Field, and the then comparison with result of calculation by measurement, carries out the judgement of extent of corrosion.In obtaining each point Potential distribution, can understand well the operation conditions of electrical network.But electromagnetic field has vectorial property, be easy to be subject to external interference, the accuracy that impact is measured and then affect the judgement of extent of corrosion.And traditional electrochemical measurement system is also difficult to measure accurately earth mat corrosion of metal state.
The state of testing scientifically and rationally characteristic parameters, the accurate evaluation grounded screen of grounded screen is the key of guaranteeing power system safety and stability operation.Because grounded screen is embedded in undergroundly, be difficult to judge the definite state of grounded screen in service.For grounded screen, generally taking security as starting point, measure the characteristic parameters such as the poor and contact potential difference of impedance ground, conducting resistance, the step voltage of grounding net of transformer substation, the measurement result of individual event is compared one by one with defined threshold, judge whether safety of grounded screen.But little for the part of grounded screen or the research of integrality.
Therefore, after System in Substation builds up and run duration, need to detect the running status of grounded screen by the means such as site test, computational analysis, and the fault that may occur grounded screen is made diagnosis in time.For this reason, the in the situation that of not affecting the normal safe operation of electric system in avoiding excavating grounded screen and testing process, can test fast and accurately the electric parameter relevant to grounded screen, obtain grounded screen scope underground medium structure distribution situation, and carry out high-resolution imaging, can accurately obtain grounded screen distributions situation very important.
Detect formation method and system about grounded screen at present, University Of Chongqing has carried out the research of the anti-formation method of grounded screen electric resistance, and the electric current injection mode in electrical impedance imaging measuring principle, circulation metering system are used for to corrosion diagnosis of grounding grid.The fault diagnosis that the method is grounded screen provides a brand-new thinking, judges intuitively by direct imaging.But in its pertinent literature, mention the method and can judge at present the general area that grounded screen conductor corrodes, can't accurately determine the particular location of corrosion, can not determine the extent of corrosion of branch road, also need further improvement.
Summary of the invention
In order to overcome the deficiency of the methods such as original large amperometry, grounded screen node analysis, electromagnetic field analysis, on-line corrosion monitoring, the present invention proposes a kind of grounded screen condition detecting system based on high-frequency impulse back scattering technology.The present invention is grounded net state monitoring by obtaining the information such as earth medium and grounded screen inner structure, electrical property feature and the regularity of distribution, is grounded the image reconstruction of net.The feature that the present invention surveys according to the super Shallow High Resolution of grounded screen, adopts based on high-frequency impulse back scattering technology.The present invention not only can obtain dielectric structure information at super shallow-layer, can also obtain resistivity information and specific inductive capacity information.By resistivity and specific inductive capacity image reconstruction, can in image, judge grounded screen state, ground net corrosion and breakpoint defect are positioned, can observe extent of corrosion and breakpoint state simultaneously.
The grounded screen condition detecting system that the present invention is based on high-frequency impulse back scattering comprises the receiving array of high-frequency impulse emission coefficient, emitting antenna, electromagnetism receiving system, multiple receiving antenna composition and data interpretation and imaging system.The described grounded screen condition detecting system based on high-frequency impulse back scattering is placed in ground, grounded screen top.Described high-frequency impulse electromagnetism emission coefficient transmitting high-frequency narrow-pulse signal, high-frequency narrow-pulse signal is sent directionally to underground grounded screen by emitting antenna, high-frequency narrow-pulse signal is after underground medium is propagated, and the receiving array being made up of multiple receiving antennas receives the signal that comprises grounded screen information.The present invention adopts the observation procedure of multi-fold to improve resolution, Full wave shape by electromagnetism receiving system settling signal gathers, the data that comprise grounded screen information that gather are processed, the final THE INVERSE ELECTROMAGNETIC SCATTERING imaging technique that adopts carries out the explanation of data, realizes the image reconstruction of underground super shallow-layer grounded screen and surrounding medium structure, resistivity and specific inductive capacity.The high-frequency impulse back scattering formation method of application system of the present invention, can realize the imaging of super Shallow High Resolution, and obtain structure, resistivity and specific inductive capacity information simultaneously.
Detected object grounded screen of the present invention is in subsurface 0.5～5m depths, grounded screen condition detecting system based on high-frequency impulse back scattering in grounded screen above the ground, the output terminal of high-frequency impulse emission coefficient connects emitting antenna, multiple receiving antennas are arranged in emitting antenna signal cover, composition receiving array, receiving antenna is connected to the input end of electromagnetism receiving system, and the output terminal of electromagnetism receiving system is connected to the input end of data interpretation and imaging system.The high-frequency pulse signal of high-frequency impulse emission coefficient output inputs to emitting antenna, emitting antenna by signal directive sending to subsurface, the signal sending is propagated between underground medium and grounded screen, the receiving array being made up of receiving antenna after propagation receives the signal that comprises underground grounded screen information, the signal of receiving antenna array flows to electromagnetism receiving system, and the output signal of electromagnetism receiving system inputs to data interpretation and imaging system is carried out data interpretation and image reconstruction.
Described emitting antenna orientation is to underground grounded screen transmission of electromagnetic signals, and the antenna that is applied to grounded screen state-detection is broad-band antenna, and antenna range is 100MHz～4GHz.
The arrangement of described emitting antenna is: grounded screen top ground configuration emitting antenna, in emitting antenna coverage, arrange multiple receiving antennas simultaneously, multiple receiving antennas form receiving array, receiving array position is fixed, make emitting antenna move, varied angle transmitting, receiving array receives.
The detection mode of emitting antenna and receiving antenna is: move at the emitting antenna that completes a position, varied angle transmitting, receiving array maintains static after reception, mobile emitting antenna and receiving antenna array simultaneously, ground, grounded screen top is detected to the division in path, many that are divided into parallel arrangement arranged side by side are detected path, detect path along Article 1 and terminal detected from starting point, then detect in the adjacent path of path and detect in Article 1, by that analogy, repetitive operation, completes the detection in all detections path.
Described high-frequency impulse emission coefficient comprises power supply, pulse producer, waveform-shaping module, the first clock source and very first time control module.Connected mode between modules with signal transmission form is: the output terminal of the first clock source is connected the input end of very first time control module, and the output terminal of very first time control module connects the input end of pulse producer; The output terminal of power supply is also connected to the input end of pulse producer; The output terminal of pulse producer connects the input end of waveform-shaping module, and the output terminal of wave shaping connects emitting antenna.Power supply provides electricity to pulse producer, and the first clock source is to very first time control module output signal, and the output signal of very first time control module inputs to pulse producer, and the output signal of pulse producer is finally exported to emitting antenna through wave shaping.
Described electromagnetism receiving system comprises second clock source, the second time control module, gain-controlled amplifier, low-pass filter, analog to digital converter, and data acquisition module.Connected mode signal transmission form between above-mentioned modules is: the output terminal in second clock source connects the input end of the second time control module, and the output terminal of the second time control module connects the input end of gain-controlled amplifier; Receiving antenna connects the input end of gain-controlled amplifier, the output terminal of gain-controlled amplifier connects the input end of low-pass filter, the input end of the output terminal connection mode number converter of low-pass filter, the input end of the output terminal connection data acquisition module of analog to digital converter, the input end of the output terminal connection data acquisition module of the second time control module.Second clock source outputs signal to the second time control module, and the output signal of the second time control module inputs to respectively gain-controlled amplifier and data acquisition module, realizes the work schedule of automatic gain control and data acquisition.Receiving antenna receives signal, send gain-controlled amplifier to, gain-controlled amplifier outputs signal to low-pass filter and carries out low-pass filtering, the output signal of low-pass filter is as the input signal of analog to digital converter, and the output signal of analog to digital converter inputs to data acquisition module as input signal.
Described data interpretation and image-generating unit comprise data interpretation module and the image display based on back scattering.Data interpretation module is the back scattering data interpretation inverting based on scattering principle, the scattered field that utilizes the outside measured signal of grounded screen scatterer to comprise is inferred the character of grounded screen, to determine the information such as significant earth medium and grounded screen inner structure, electrical property feature and the regularity of distribution in scattered field data.The image of image display display structure image, resistivity/specific inductive capacity.
The processes and operations step that the present invention is based on the grounded screen condition detecting system of high-frequency impulse back scattering is:
(1) ground configuration emitting antenna above grounded screen is arranged multiple receiving antennas simultaneously in emitting antenna coverage, and multiple receiving antennas form receiving array;
(2) high-frequency impulse emission coefficient and electromagnetism receiving system are placed in to ground, grounded screen top, high-frequency impulse emission coefficient connects emitting antenna, and the receiving array that multiple receiving antennas form connects electromagnetism receiving system;
(3) high-frequency impulse emission coefficient and electromagnetism receiving system are powered on, carry out observation and data acquisition that transmission antennas transmit and receiving array receive, fixed reception antenna simultaneously, makes that emitting antenna moves, varied angle transmitting;
(4) mobile emitting antenna and receiving array arrive next surveyed area, the content of repeating step (3) simultaneously;
(5), according to the detection path of design, complete the status monitoring of whole large area grounded screen;
(6) application back scattering method is carried out the explanation of image data, is finally grounded web frame, the imaging of resistivity/specific inductive capacity.
By resistivity and specific inductive capacity image reconstruction, can in image, judge grounded screen state, ground net corrosion and breakpoint defect are positioned, can observe extent of corrosion and breakpoint state simultaneously.
Brief description of the drawings
The grounded screen condition detecting system schematic diagram of Fig. 1 based on high-frequency impulse back scattering technology;
Fig. 2 high-frequency impulse back scattering grounded screen condition detecting system detects path;
Fig. 3 high-frequency impulse back scattering grounded screen condition detecting system schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
The structure that the present invention is based on the grounded screen condition detecting system of high-frequency impulse back scattering technology forms schematic diagram as shown in Figure 1.Described grounded screen condition detecting system comprises the receiving array of high-frequency impulse emission coefficient, emitting antenna, electromagnetism receiving system, multiple receiving antenna composition, and data interpretation and imaging system.Imaging in data interpretation and imaging system comprises structure imaging and the imaging of resistivity/specific inductive capacity.The ground of grounded screen condition detecting system based on high-frequency impulse back scattering in grounded screen top, high-frequency impulse electromagnetism emission coefficient transmitting high-frequency narrow-pulse signal, sends directionally to underground grounded screen by high-frequency narrow-pulse signal by emitting antenna.High-frequency narrow-pulse signal is propagated through underground medium, the receiving array being made up of multiple receiving antennas receives this signal, adopt the observation procedure of multi-fold to improve resolution, Full wave shape by electromagnetism receiving system settling signal gathers, the data that comprise grounded screen information that gather are processed, the final THE INVERSE ELECTROMAGNETIC SCATTERING imaging technique that adopts carries out the explanation of data, realizes the image reconstruction of underground super shallow-layer grounded screen and surrounding medium structure, resistivity and specific inductive capacity.The high-frequency impulse back scattering formation method of application system of the present invention, can realize the imaging of super Shallow High Resolution, and obtain structure, resistivity and specific inductive capacity information simultaneously.By resistivity and specific inductive capacity image reconstruction, can in image, judge grounded screen state, ground net corrosion and breakpoint defect are positioned, can observe extent of corrosion and breakpoint state simultaneously.
Described emitting antenna orientation is to underground grounded screen transmission of electromagnetic signals, and the antenna that is applied to grounded screen state-detection is broad-band antenna, and antenna range is 100MHz～4GHz.
The arrangement of described antenna is: the ground configuration emitting antenna above grounded screen, in the coverage of emitting antenna, arrange multiple receiving antennas simultaneously, and multiple receiving antennas form receiving array.The invariant position of fixed reception array, makes emitting antenna move, varied angle transmitting, and receiving array receives.
The detection path of high-frequency impulse back scattering grounded screen condition detecting system as shown in Figure 2.The emitting antenna that completes a position moves, after varied angle transmitting, mobile emitting antenna and receiving antenna array, ground, grounded screen top is detected to the division in path, many that are divided into parallel arrangement arranged side by side are detected path, detect path along Article 1 and terminal detected from starting point, then detect in the adjacent path of path and detect in Article 1, by that analogy, repetitive operation, completes the detection in all detections path.
As shown in Figure 3, described high-frequency impulse emission coefficient comprises power supply, pulse producer, waveform-shaping module, the first clock source 1 and very first time control module 1.Connected mode is: the output of the first clock source 1 is as the input of very first time control module 1, and the output of very first time control module 1 is as the input of pulse producer, and the output of power supply is simultaneously also as the input of pulse producer.The output of pulse producer is as the input of waveform-shaping module, and the output of waveform-shaping module connects emitting antenna.Power supply provides electricity to pulse producer.Clock source 1 outputs signal to very first time control module 1, and the output signal of very first time control module 1 inputs to pulse producer, and the output signal of pulse producer is carried out wave shaping through waveform-shaping module, finally exports to emitting antenna.
Described electromagnetism receiving system comprises second clock source 2, the second time control module 2, gain-controlled amplifier, low-pass filter, analog to digital converter, and data acquisition module.Connected mode is: the output terminal in second clock source 2 connects the input end of the second time control module 2, the output terminal of the second time control module 2 connects the input end of gain-controlled amplifier, the output terminal of receiving antenna connects the input end of gain-controlled amplifier, the output terminal of gain-controlled amplifier connects the input end of low-pass filter, the input end of the output terminal connection mode number converter of low-pass filter, the input end of the output terminal connection data acquisition module of analog to digital converter, the input end of the output terminal connection data acquisition module of the second time control module 2.The output signal that second clock source 2 outputs signal to the second time control module 2, the second time control module 2 inputs to respectively gain-controlled amplifier and data acquisition module, realizes the work schedule of automatic gain control and data acquisition.Receiving antenna receives signal and sends gain-controlled amplifier to, gain-controlled amplifier outputs signal to low-pass filter and carries out low-pass filtering, low-pass filter output signal is to analog to digital converter as input signal, and the output signal of analog to digital converter inputs to data acquisition as input signal.
Described data interpretation and image-generating unit comprise data interpretation module and the image display based on back scattering, data interpretation module carries out the inverting of back scattering data interpretation based on scattering principle, utilize grounded screen scatterer outside to record the scattered field comprising in signal to infer the character of grounded screen, to determine the information such as significant earth medium and grounded screen inner structure, electrical property feature and the regularity of distribution in scattered field data; The image that image display shows comprises the image of structural images, resistivity/specific inductive capacity.
Claims (7)
1. the grounded screen condition detecting system of a high-frequency impulse back scattering imaging, it is characterized in that, described detection system comprises the receiving array of high-frequency impulse emission coefficient, emitting antenna, electromagnetism receiving system, multiple receiving antenna composition, and data interpretation and imaging system; The described grounded screen condition detecting system based on high-frequency impulse back scattering imaging technique is placed in ground, grounded screen top; The output terminal of high-frequency impulse emission coefficient connects emitting antenna, and multiple receiving antennas are arranged in emitting antenna signal cover, composition receiving array; Receiving antenna is connected to the input end of electromagnetism receiving system, and the output terminal of electromagnetism receiving system is connected to the input end of data interpretation and imaging system; The high-frequency pulse signal of high-frequency impulse emission coefficient output inputs to emitting antenna, emitting antenna is by extremely underground grounded screen of signal directive sending, the signal sending is propagated between underground medium and grounded screen, the receiving array being made up of multiple receiving antennas receives the signal that comprises underground grounded screen information, the signal of receiving antenna array is delivered to electromagnetism receiving system, and the output signal of electromagnetism receiving system inputs to data interpretation and imaging system is carried out data interpretation and image reconstruction.
2. high-frequency impulse back scattering grounded screen condition detecting system according to claim 1, is characterized in that, described emitting antenna is broad-band antenna, and antenna range is 100MHz～4GHz; Emitting antenna is arranged in the ground of grounded screen top.
3. high-frequency impulse back scattering grounded screen condition detecting system according to claim 1, is characterized in that, in single surveyed area, multiple described receiving antennas are arranged in emitting antenna coverage, form receiving array; The position of receiving array is fixed, and makes emitting antenna move, varied angle transmitting, and receiving array carries out signal reception.
4. high-frequency impulse back scattering grounded screen condition detecting system according to claim 1, is characterized in that, described high-frequency impulse emission coefficient comprises power supply, pulse producer, wave shaping, the first clock source (1) and very first time control module (1); The output terminal of described the first clock source (1) connects the input end of very first time control module (1), and the output terminal of very first time control module (1) connects the input end of pulse producer; The output terminal of power supply is also connected to the input end of pulse producer; The output terminal of pulse producer connects the input end of waveform-shaping module, and the output terminal of wave shaping connects emitting antenna; Power supply provides electricity to pulse producer, the first clock source (1) is to very first time control module (1) output signal, the output signal of very first time control module (1) inputs to pulse producer, and the output signal of pulse producer is finally exported to emitting antenna through wave shaping.
5. high-frequency impulse back scattering grounded screen condition detecting system according to claim 1, it is characterized in that, described electromagnetism receiving system comprises second clock source (2), the second time control module (2), gain-controlled amplifier, low-pass filter, analog to digital converter and data acquisition module; The output terminal in described second clock source (2) connects the input end of the second time control module (2), and the output terminal of the second time control module (2) connects the input end of gain-controlled amplifier; Receiving antenna connects the input end of gain-controlled amplifier, the output terminal of gain-controlled amplifier connects the input end of low-pass filter, the input end of the output terminal connection mode number converter of low-pass filter, the input end of the output terminal connection data acquisition module of analog to digital converter, the input end of the output terminal connection data acquisition module of the second time control module (2).
6. high-frequency impulse back scattering grounded screen condition detecting system according to claim 1, is characterized in that, described data interpretation and image-generating unit comprise data interpretation module and the image display based on back scattering; Data interpretation module is the back scattering data interpretation inverting based on scattering principle, the scattered field that utilizes the outside measured signal of grounded screen scatterer to comprise is inferred the character of grounded screen, to determine the information such as significant earth medium and grounded screen inner structure, electrical property feature and the regularity of distribution in scattered field data; The image of image display display structure image, resistivity/specific inductive capacity.
7. high-frequency impulse back scattering grounded screen condition detecting system according to claim 1, it is characterized in that, described emitting antenna and the detection mode of receiving antenna are: move at the emitting antenna that completes a position, varied angle transmitting, receiving array maintains static after reception, mobile emitting antenna and receiving antenna array simultaneously, ground, grounded screen top is detected to the division in path, many that are divided into parallel arrangement arranged side by side are detected path, detect path along Article 1 and terminal detected from starting point, then in the adjacent path in Article 1 detection path, detect, by that analogy, repetitive operation, complete the detection in all detections path.
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| CN104965153A (en) * | 2015-06-10 | 2015-10-07 | 国网上海市电力公司 | High frequency electromagnetic pulse-based transformer station grounding grid corrosion detection system and method |
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| CN106525977A (en) * | 2016-11-25 | 2017-03-22 | 国网山西省电力公司电力科学研究院 | Transient electromagnetic method based grounding grid imaging device |
| CN106770665A (en) * | 2016-11-25 | 2017-05-31 | 国网山西省电力公司电力科学研究院 | A kind of grounded screen imaging method based on transient electromagnetic method |
| CN106525977B (en) * | 2016-11-25 | 2019-04-26 | 国网山西省电力公司电力科学研究院 | A kind of grounded screen imaging device based on transient electromagnetic method |
| CN106770665B (en) * | 2016-11-25 | 2019-10-01 | 国网山西省电力公司电力科学研究院 | A kind of grounded screen imaging method based on transient electromagnetic method |
| CN109725003A (en) * | 2018-11-20 | 2019-05-07 | 浙江大学 | A kind of miniature darkroom for being imaged and measuring for microwave back scattering |
| CN109725003B (en) * | 2018-11-20 | 2020-08-14 | 浙江大学 | Micro darkroom for microwave backscattering imaging and measurement |
| CN112595732A (en) * | 2020-12-09 | 2021-04-02 | 西安邮电大学 | Welding spot quality detection method based on ultra-wideband microwave |
| CN112595732B (en) * | 2020-12-09 | 2023-03-10 | 西安邮电大学 | Welding spot quality detection method based on ultra-wideband microwave |
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