WO2021215600A1 - Dispositif de visualisation ultrasonore portable équipé d'une caméra thermographique - Google Patents

Dispositif de visualisation ultrasonore portable équipé d'une caméra thermographique Download PDF

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Publication number
WO2021215600A1
WO2021215600A1 PCT/KR2020/014485 KR2020014485W WO2021215600A1 WO 2021215600 A1 WO2021215600 A1 WO 2021215600A1 KR 2020014485 W KR2020014485 W KR 2020014485W WO 2021215600 A1 WO2021215600 A1 WO 2021215600A1
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WIPO (PCT)
Prior art keywords
ultrasonic
main board
board
sensor array
thermal imaging
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PCT/KR2020/014485
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English (en)
Korean (ko)
Inventor
김영기
김인권
이광현
안병호
Original Assignee
(주)에스엠인스트루먼트
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Publication of WO2021215600A1 publication Critical patent/WO2021215600A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/48—Thermography; Techniques using wholly visual means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/42—Detecting the response signal, e.g. electronic circuits specially adapted therefor by frequency filtering or by tuning to resonant frequency

Definitions

  • the present invention relates to a portable ultrasound visualization device equipped with a thermal imaging camera capable of overlaying an ultrasound image, an optical image, and a thermal image measured through a thermal imaging camera) on a single screen by superimposing 2-3 types.
  • a portable ultrasound visualization device equipped with a thermal imaging camera capable of overlaying an ultrasound image, an optical image, and a thermal image measured through a thermal imaging camera) on a single screen by superimposing 2-3 types.
  • it instead of analyzing echo-reflected ultrasonic waves by providing ultrasonic waves with a projectile and an ultrasonic receiver, it shows the location of ultrasonic waves that are naturally radiated (not echo signals) from mechanical equipment or gas pipes as image images, and also generates ultrasonic waves.
  • a portable ultrasound visualization device equipped with a thermal imaging camera used for diagnosing equipment failures by showing a location image and a thermal image on one screen.
  • a high voltage panel, a low pressure panel, a distribution panel, and a motor control panel equipped with an ultrasound-based arc and corona discharge monitoring and diagnosis system are based on ultrasound to diagnose the arc or corona discharge state of a housing containing a high voltage panel inside.
  • the high-pressure panel equipped with the arc and corona discharge monitoring and diagnosis system of ; And, based on the ultrasonic signal detected by the sensor unit, detects arc or corona discharge generated in the facility, and configures an abnormality determination unit for controlling the internal state of the housing according to the detected arc or corona discharge information
  • a high-voltage panel a low-pressure panel, a distribution panel, and a motor control panel equipped with an ultrasound-based arc and corona discharge monitoring and diagnosis system including a monitoring device.
  • An object of the present invention is to provide a portable ultrasound equipment failure diagnosis apparatus capable of overlaying an ultrasound image, an optical image, and a thermal image measured by a thermal imager on a single screen by superimposing 2-3 types.
  • a medical ultrasound diagnostic device that visualizes an internal shape by a reflected wave after an ultrasonic wave is emitted by a conventional ultrasound device, an ultrasonic sound source that is naturally radiated by interaction between components in a pipe leakage, defective power equipment, and broken mechanical equipment (devices)
  • the present invention can implement the sound of the ultrasonic region more efficiently than the vibration sound that can diagnose the initial failure in machinery failure diagnosis, failure prediction, and monitoring, and the ultrasonic sensor, the processing device, the battery, the display device (display), etc. are one It is provided in the body case and enables the user to perform ultrasound visualization while easily moving the measurement point, and to display the result in real time with a thermal image as a visual display device or to recognize it through an auditory display device. to provide the device.
  • the present invention optimizes and minimizes the data processing amount (processing step) for radiation ultrasound visualization without losing the location size information of the ultrasound sound source in the ultrasound region where the data processing capacity is inevitably large, thereby providing proper performance and computational processing capability.
  • a program and electronic means that form an arithmetic processing step so as to be executable by electronic means having a
  • the present invention visually shows the thermal images taken with a thermal imaging camera together with the ultrasonic visualization results in real time so that not only the visualization of ultrasound but also the heat dissipation phenomenon can be visualized together with the results of ultrasound visualization, pipe leakage, faulty power equipment and
  • An object of the present invention is to provide a portable ultrasonic visualization device equipped with a thermal imaging camera that increases the accuracy of detecting malfunctions in mechanical equipment (device).
  • the apparatus for diagnosing a mobile ultrasound imaging facility of the present invention is an apparatus for diagnosing equipment failure using radiated ultrasonic sensing, and includes a plurality of (N) ultrasonic sensors and a sound wave sensor array that senses ultrasonic signals radiated from the equipment while oriented toward the radiated sound source.
  • N the number of ultrasonic sensors
  • S sound wave sensor array
  • a data acquisition board having an electronic circuit mounted on a substrate for acquiring ultrasonic signals (x n ) at a sampling frequency (f s) of ultrasonic signals detected by the ultrasonic sensor array;
  • a main board having an arithmetic processing device for processing the ultrasonic signal received from the data acquisition beam mounted on a substrate, and transmitting the processed ultrasonic sound source information to the display device;
  • a data storage medium for storing data processed by the arithmetic processing unit of the main board
  • a display device for visually displaying the data processed by the arithmetic processing device of the main board; an optical camera that captures an image in a direction in which the sound wave sensor array is directed and delivers it to the main board 30; It characterized in that it comprises a; thermal imaging camera for taking a thermal image (Thermal Image) in the direction the optical camera is directed.
  • Thermal Imaging camera for taking a thermal image (Thermal Image) in the direction the optical camera is directed.
  • the portable ultrasound imaging equipment diagnosis apparatus of the present invention further includes a case-built rechargeable battery or an external portable battery for supplying power to the data acquisition board, the main board, and the display device, the sound wave sensor array) and the data acquisition board
  • the main board and data storage medium are mounted and fixed in a hard plastic body case,
  • the main board expresses at least two or three selected from the ultrasonic sound source information, the optical image in the direction the sensor array imaged by the optical camera is facing, and the thermal image photographed by the thermal imaging camera by matching the position coordinates. It is preferable to display it by overlaying it on the device together.
  • an ultrasound image, an optical image, and a portable ultrasound equipment failure diagnosis device capable of overlaying two or three types of thermal images (thermal images, infared images) measured through a thermal imaging camera by superimposing them on one screen is provided
  • a portable ultrasound equipment failure diagnosis apparatus that visualizes an ultrasound sound source image naturally radiated by a thermal image or an optical image.
  • the present invention it is possible to implement the sound of the ultrasonic region more efficiently than the vibration sound that can diagnose the initial failure in the diagnosis of machinery failure or failure prediction and monitoring, and the ultrasonic sensor, processing device, battery, display device (display), etc.
  • a portable ultrasonic wave provided in this single body case that enables the user to perform ultrasound visualization while easily moving the measurement point, and to display the result in real time with a thermal image as a visual display device or to recognize it through an auditory display device
  • a device for diagnosing equipment failure is provided.
  • the data processing amount (processing step) for radiation ultrasound visualization is reduced as much as possible without losing the ultrasonic sound source position size information, so that proper performance and calculation processing are performed.
  • a program and electronic means that form an arithmetic processing step so as to be executable by electronic means having the capability,
  • thermo images taken with a thermal imaging camera are visually displayed together with the ultrasonic visualization results in real time to visualize the heat dissipation phenomenon as well as the visualization of ultrasonic waves.
  • a portable ultrasonic visualization apparatus equipped with a thermal imaging camera having increased accuracy of anomaly detection is provided.
  • FIG. 1 is a conceptual diagram showing the coordinates of the radiation ultrasound visualization sensor and the virtual plane coordinates of the present invention.
  • Figure 2 is a conceptual diagram of the time delay summation of the radiation ultrasound visualization of the present invention.
  • FIG. 3 is a block diagram of a mobile ultrasound equipment failure diagnosis apparatus according to the present invention.
  • Figure 6 is a state diagram showing the ultrasonic sound source generated from the side of the laptop and the high and low of the temperature with a color gradient.
  • the apparatus for diagnosing a mobile ultrasound imaging facility of the present invention is an apparatus for diagnosing equipment failure using radiated ultrasonic sensing, and includes a plurality of (N) ultrasonic sensors and a sound wave sensor array that senses ultrasonic signals radiated from the equipment while oriented toward the radiated sound source.
  • N the number of ultrasonic sensors
  • S sound wave sensor array
  • a data acquisition board having an electronic circuit mounted on a substrate for acquiring ultrasonic signals (x n ) at a sampling frequency (f s) of ultrasonic signals detected by the ultrasonic sensor array;
  • a main board having an arithmetic processing device for processing the ultrasonic signal received from the data acquisition beam mounted on a substrate, and transmitting the processed ultrasonic sound source information to the display device;
  • a data storage medium for storing data processed by the arithmetic processing unit of the main board
  • a display device for visually displaying the data processed by the arithmetic processing device of the main board; an optical camera that captures an image in a direction in which the sound wave sensor array is directed and delivers it to the main board 30; It characterized in that it comprises a; thermal imaging camera for taking a thermal image (Thermal Image) in the direction the optical camera is directed.
  • Thermal Imaging camera for taking a thermal image (Thermal Image) in the direction the optical camera is directed.
  • the portable ultrasound imaging equipment diagnosis apparatus of the present invention further includes a case-built rechargeable battery or an external portable battery for supplying power to the data acquisition board, the main board, and the display device, the sound wave sensor array) and the data acquisition board
  • the main board and data storage medium are mounted and fixed in a hard plastic body case,
  • the main board expresses at least two or three selected from the ultrasonic sound source information, the optical image in the direction the sensor array imaged by the optical camera is facing, and the thermal image photographed by the thermal imaging camera by matching the position coordinates. It is preferable to display it by overlaying it on the device together.
  • FIG. 1 is a conceptual diagram of the radiation ultrasound visualization sensor coordinates and virtual plane coordinates of the present invention
  • FIG. 2 is a conceptual diagram of the radiation ultrasound visualization time delay summation of the present invention
  • FIG. It is a configuration diagram of the apparatus
  • FIGS. 4 and 5 are explanatory diagrams of the radiation ultrasound visualization process of the present invention.
  • the present invention does not analyze echo-reflected ultrasonic waves by providing ultrasonic waves with a projectile and an ultrasonic receiver, but shows the location of ultrasonic waves that are naturally radiated (not echo signals) from mechanical equipment or gas pipes as image images, and also generates ultrasonic waves.
  • the present invention relates to a portable ultrasound imaging equipment diagnosis apparatus used to diagnose equipment failures by displaying a location image and a thermal image on one screen.
  • An apparatus for diagnosing a portable equipment failure provided with an electronic means for radiation ultrasound visualization and a computer program includes an ultrasonic sensor array (10, Array), a data acquisition board (DAQ board, 20), and a main board (30). ), a data storage medium 40 , a battery 50 , a plastic body case 60 , a display device 70 , an optical camera 80 , and a thermal imaging camera 90 .
  • the ultrasonic sensor array 10 is composed of a plurality of (N) ultrasonic sensors 11 and senses ultrasonic signals radiated from the facility while directing the radiation sound source.
  • the ultrasonic sensor array 10 may be a type in which a plurality of MEMS microphones, ultrasonic transducers, and ultrasonic sensors are mounted on a flat printed circuit board (PCB) or a curved (three-dimensional) flexible printed circuit board (Flexible PCB).
  • the data acquisition board (DAQ board, 20) has an electronic circuit for acquiring the ultrasonic signals (x n ) at a sampling frequency (Sampling Frequency, f s ) of the ultrasonic signals detected by the ultrasonic sensor array (10, Array) on the board. is mounted
  • the data acquisition board (DAQ board) 20 may be in charge of sampling and may have a built-in signal amplification circuit.
  • the main board 30 has an arithmetic processing unit 31 that processes digital (or analog) ultrasonic signals received from the data acquisition board (DAQ board, 20) mounted on the board, and displays the processed ultrasonic sound source information ( 70).
  • the data storage medium 40 stores data processed by the arithmetic processing unit 31 of the main board 30 .
  • the battery 50 supplies power to the data acquisition board 20 and the main board 30 , and it is preferable that it is provided in a removable and rechargeable manner inside the plastic body case 60 , but on the outside of the plastic body case 60 . It may be a separate portable rechargeable battery that is located and supplies power to the data acquisition board 20 and the main board 30 and the display device 70 with wires. Alternatively, both an internal battery and an external auxiliary battery may be provided and used.
  • the plastic body case 60 is made of a hard material for fixing the ultrasonic sensor array 10 , the data acquisition board 20 , the main board 30 , and the data storage medium 40 .
  • the plastic body case 60 supports an array 10 composed of a plurality of ultrasonic sensors 11 electrically connected to each other, or an ultrasonic sensor array PCB on a flat or curved plate on which the ultrasonic sensors 11 are mounted. It is preferable to support the ultrasonic sensor array (10, Array) by supporting and fixing the substrate.
  • a hollow chamber is formed inside the plastic body case 60 , and the data acquisition board 20 and the main board 30 having arithmetic processing capability are fixedly installed in the hollow chamber.
  • the display device 70 visually expresses the data processed by the arithmetic processing device 31 of the main board 30 and is integrally installed in the plastic body case 60 .
  • the expression device 70 is integrally fixed to the plastic body case 60 so as to be exposed to the outside of the plastic body case 60 .
  • the optical camera 80 captures an image in a direction in which the ultrasonic sensor array 10 is oriented and transmits it to the main board 30 .
  • the lens of the optical camera 80 when the sensor array 10 (Array) has a flat plate shape, the optical lens is exposed toward the direction it is directed.
  • the front of the plastic body case 60 has a hole for exposing the lens of the optical camera 80 .
  • the thermal imaging camera 90 photographing takes a thermal image in the direction the optical camera 80 is oriented and transmits it to the main board 30 having an arithmetic processing unit.
  • the main board 30 is displayed by overlaying the ultrasonic sound source information and the optical image in the direction in which the sensor array 10 captured by the optical camera 70 is facing on the display device 70 (Over Lay).
  • the thermal imaging camera 90 may be replaced by a thermal imaging camera having a different thermal imaging principle.
  • the thermal imaging camera takes an infrared image in the direction the user is pointing, and transmits the high and low temperature to the display device as a color gradient.
  • 5 is a flow chart of the radiation ultrasound visualization method of the present invention. 1 to 5 , in the delay distance calculation step S10 , the distances between the sensors 11 and the virtual plane points are calculated using the sensor coordinates and the virtual plane coordinates.
  • 1 is a diagram showing the relationship between sensor coordinates and virtual plane coordinates. As shown, the distance d k between the sensor coordinates (Xs, Ys) and the virtual plane coordinates (Xg, Yg) is calculated as follows. When the distance L is 1 m, the operation of +L 2 is expressed as +1 operation.
  • the ultrasonic sensor array (10, Array) consisting of a plurality of (N) ultrasonic sensors 11 and directing the radiation source detects ultrasonic signals.
  • the data acquisition board (DAQ board, 20) acquires the ultrasonic signals (x n ) by sampling the ultrasonic signals detected by the ultrasonic sensor array (10, Array) at a sampling frequency (Sampling Frequency, f s ) do.
  • a detailed equation for the ultrasound signal (x n ) is as follows.
  • S Sample Number.
  • f s Sampling Rate (frequency).
  • the main board 30 having the arithmetic processing unit is preset to the ultrasonic signals (x n ) acquired in the step (S30) in the ultrasonic frequency band (f 1 to f 2 ) band
  • a step S40 of applying a band pass filter is performed.
  • x nf [s] 1 ⁇ nf ⁇ N.
  • FIG. 2 is a conceptual diagram illustrating the time delay summation of radiation ultrasound visualization according to the present invention.
  • step (S50) time delay correction is applied to each of the ultrasound signals (x n ) using the delay distances of the step (S10), and by summing them, the sound source values of M virtual plane points ( r nk ) are computed.
  • the number of delayed samples is calculated.
  • the time delay is calculated using the distance between the sensor and the virtual plane and the speed of sound, and the number of delay samples is calculated using the calculated time delay. Details are as follows.
  • C d is the time delay coefficient
  • c is the speed of sound
  • N k is the number of delayed samples.
  • the sum is performed after compensating for the time delay using the number of delayed samples. At this time, a correction coefficient for each sensor is applied.
  • M is the number of all elements in the row and column in the imaginary plane coordinates.
  • a beam power level calculation step (S60) of calculating the beam power levels (z, Beam Power Levels) of the sound source values (r nk ) generated in step S40 is performed.
  • the beam power levels (z) calculated in the step (S50) are overlaid on the display device 70 together with the optical image of the direction in which the sensor array 10 (Array) is facing. ) to express
  • the ultrasonic sensor array 10 may be configured in such a way that a plurality of ultrasonic sensors 11 are mounted on a printed circuit board forming a single plane.
  • the ultrasonic sensor array (10, Array) is exposed to the front of the device and positioned so as to face the front (one direction).
  • a plurality of ultrasonic sensors 11 may be arranged at regular intervals on a sphere, a substantially ball-shaped polyhedron, a hemisphere, or a rear open convex curved body.
  • the ultrasonic sensor array 10 may be in a form in which a MEMS microphone, an ultrasonic transducer, or a plurality of ultrasonic sensors are mounted on a flexible printed circuit board (Flexible PCB) on a curved (three-dimensional) surface.
  • a MEMS microphone an ultrasonic transducer
  • a plurality of ultrasonic sensors are mounted on a flexible printed circuit board (Flexible PCB) on a curved (three-dimensional) surface.
  • sampling Frequency is in the range of 20KHz (40KHz) to 200KHz
  • the lower limit (f 1 ) and the upper limit (f 2 ) of the ultrasonic frequency band of the band pass filter are 10 KHz It is preferable that one range exists between (20KHz) and 100KHz.
  • the apparatus for diagnosing a portable equipment failure provided with an electronic means for visualizing radiation ultrasound and a computer program according to an embodiment of the present invention further includes an audio output means (80, speaker) for listening.
  • the main board 30 converts some or all of the generated sound source values (r nk ) by heterodyne conversion to convert an audible sound signal of a sound wave band (100Hz to 20KHz), and the main board 30 transmits the audible sound signal to the audio output means 90 for listening, so that the user can perceive the radiated ultrasound by hearing.
  • the portable ultrasound imaging equipment diagnosis apparatus includes an input window for a user interface electrically and electronically connected to the main board 30 so as to be exposed to the plastic body case 60, and includes a band pass filter. It is preferable that the lower limit (f 1 ) and the upper limit (f 2 ) of the ultrasonic frequency band of can be input by the user through an input window for a user interface. That is, before the ultrasonic sensing step ( S20 ), the step of inputting the lower limit ( f 1 ) and the upper limit ( f 2 ) of the ultrasonic frequency band of the band pass filter through the input window is performed. It may be entered through a user input window or a method may be performed in which the user selects from among a plurality of ranges previously input by the designer.
  • FIG. 6 is a state diagram showing the ultrasonic sound source generated from the side of the notebook computer and the high and low temperature in a color gradient.
  • the detection of the anomaly can be more perfect, and it was found that it is more effective than when only the noise visualization was applied to the detection of the anomaly.
  • thermo images taken with a thermal imaging camera are visually displayed together with the ultrasonic visualization results in real time to visualize the heat dissipation phenomenon as well as the visualization of ultrasonic waves.
  • a portable ultrasonic visualization apparatus equipped with a thermal imaging camera having increased accuracy of anomaly detection is provided.

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  • General Health & Medical Sciences (AREA)
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Abstract

La présente invention concerne un dispositif de diagnostic de dysfonctionnement d'installation faisant appel à la détection d'ondes ultrasonores émises. Plus précisément, la présente invention concerne un dispositif de diagnostic d'installation mobile par images ultrasonores comprenant un moyen électronique servant à visualiser des ondes ultrasonores émises, le dispositif comprenant : un réseau de capteurs ultrasonores (10) qui comprend de multiples (N) capteurs ultrasonores (11) et qui est conçu pour détecter les signaux ultrasonores émis par une installation tout en visant une source sonore émise ; une carte d'acquisition de données (carte DAQ, 20) comportant un circuit électronique monté sur son substrat de façon à acquérir des signaux ultrasonores (xn) à une fréquence d'échantillonnage (fs) à partir de signaux ultrasonores détectés par le réseau de capteurs ultrasonores (10) ; une carte principale (30) comportant un dispositif informatique/traitement (31) monté sur son substrat de façon à traiter des signaux ultrasonores reçus en provenance de la carte DAQ (20), la carte principale (30) transférant des informations de source sonore ultrasonore traitée à un dispositif d'affichage (70) ; un support de stockage de données (40) servant à stocker des données traitées par le dispositif informatique/traitement (31) de la carte principale (30) ; un dispositif d'affichage (70) servant à afficher visuellement des données traitées par le dispositif informatique/traitement (31) de la carte principale (30) ; une caméra optique (80) servant à capturer des images dans la direction dans laquelle est orienté le réseau de capteurs ultrasonores (10) et à les transférer à la carte principale (30) ; et une caméra thermographique (90) servant à capturer des images thermiques dans la direction dans laquelle est orientée la caméra optique (80).
PCT/KR2020/014485 2020-04-21 2020-10-22 Dispositif de visualisation ultrasonore portable équipé d'une caméra thermographique WO2021215600A1 (fr)

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KR10-2020-0048054 2020-04-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101522996B1 (ko) * 2015-01-30 2015-05-27 (주)코어센스 비파괴 검사용 복합 영상 출력장치
WO2018212574A1 (fr) * 2017-05-16 2018-11-22 (주)에스엠인스트루먼트 Dispositif de diagnostic d'une installation d'imagerie ultrasonore mobile
KR20190052445A (ko) * 2017-11-08 2019-05-16 한국전력공사 전력기기 내부이상 측정용 복합센서 및 이를 이용한 진단 장치
KR20190122459A (ko) * 2018-04-20 2019-10-30 한국전력공사 전력설비의 불량지점 진단장치 및 진단방법
CN110608804A (zh) * 2019-08-16 2019-12-24 宁海县雁苍山电力建设有限公司 一种具备红外和局放功能的智能检测设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101522996B1 (ko) * 2015-01-30 2015-05-27 (주)코어센스 비파괴 검사용 복합 영상 출력장치
WO2018212574A1 (fr) * 2017-05-16 2018-11-22 (주)에스엠인스트루먼트 Dispositif de diagnostic d'une installation d'imagerie ultrasonore mobile
KR20190052445A (ko) * 2017-11-08 2019-05-16 한국전력공사 전력기기 내부이상 측정용 복합센서 및 이를 이용한 진단 장치
KR20190122459A (ko) * 2018-04-20 2019-10-30 한국전력공사 전력설비의 불량지점 진단장치 및 진단방법
CN110608804A (zh) * 2019-08-16 2019-12-24 宁海县雁苍山电力建设有限公司 一种具备红外和局放功能的智能检测设备

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