WO2017030284A1 - 지하 물성 탐사시스템 및 이를 이용한 지하 물성 분석방법 - Google Patents
지하 물성 탐사시스템 및 이를 이용한 지하 물성 분석방법 Download PDFInfo
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- WO2017030284A1 WO2017030284A1 PCT/KR2016/007082 KR2016007082W WO2017030284A1 WO 2017030284 A1 WO2017030284 A1 WO 2017030284A1 KR 2016007082 W KR2016007082 W KR 2016007082W WO 2017030284 A1 WO2017030284 A1 WO 2017030284A1
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- underground
- magnetic field
- antenna
- electric field
- exploration system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
Definitions
- the present invention relates to an apparatus and method for analyzing the physical properties of the underground by using the principle of underground radar exploration, more specifically, a dipole-type sensor that transmits and receives an electric field signal is mainly used loops, coils for transmitting and receiving magnetic field signals Due to the exclusion of the type of sensor, only underground images using electric field reflected waves can be obtained, and underground images using magnetic field reflected waves cannot be obtained, and radar using ground-penetrating radar (GPR) of the prior art.
- GPR ground-penetrating radar
- the present invention relates to an underground physical property exploration system and a method for measuring underground physical properties using the same.
- the present invention in order to solve the problems of the prior art GPR probe techniques that mainly receive the electric field signal and exclude the reception of the magnetic field signal as described above, the transmission to copy the electromagnetic pulse signal located at a specific point of the ground Including an antenna and a receiving antenna pair for measuring the electric and magnetic field signals respectively formed by the above-mentioned radiation signal, the underground reaction of the electric field as well as the magnetic field is simultaneously performed by operating the electric field signal receiving sensor and the magnetic field signal receiving sensor in parallel.
- the underground property exploration system configured to more accurately and effectively identify the underground physical properties than the existing ones, and About underground property analysis method to be.
- a technique for exploring and analyzing underground physical properties includes radar exploration techniques for transmitting and receiving electromagnetic waves to explore underground physical properties, and electromagnetic induction exploration for exploring underground physical properties using magnetic fields. induction techniques are widely used.
- the radar probe technique is a method of transmitting and receiving an electric field signal of approximately 100 MHz to 1 GHz for exploring underground physical properties
- the electromagnetic (EM) induction technique is a magnetic field of several kHz or less. It is a method of exploring underground properties by transmitting and receiving signals.
- an ultra-wideband pulse is used as another example of the related art related to the apparatus and method for performing underground exploration using GPR as described above. It is possible to detect more precisely, to facilitate the interface of each module, to detect the site and to move the equipment, and to be able to detect the speed of 4km / Day, thereby improving the work efficiency and reducing the cost through compact integration.
- the signal analysis device for the detection of underground facilities using the GIRP system which is configured to be possible has been presented.
- a low frequency band pulse signal A low frequency radar module that generates and radiates a response signal reflected from an underground cavity formed on the lower side of the pavement, and generates and radiates a high frequency band pulse signal and recognizes the metal wire mesh between the middle and base layers of the pavement and between the base and soil layers.
- a plurality of high frequency radar modules for acquiring a response signal reflected from the ruler and an image processing device for displaying the signals obtained from the low frequency radar module and the signals obtained from the high frequency radar module.
- Underground exploration level configured to detect underground cavities at high speed simultaneously It has been suggested a paved road safety inspection system and method for more.
- a dipole type antenna that is light and simple and has a small difference in radiation pattern according to frequency change is advantageous to use than a loop type.
- a dipole type sensor is mainly used.
- the senor in EM induction using a lower frequency band than GPR, in the electromagnetic induction range, the sensor has a very small structure relative to the wavelength, which is advantageous in that the loop shape is relatively impedance compared to the dipole shape. For this reason, a loop or coil type sensor has been mainly used as a sensor for transmitting and receiving magnetic field signals.
- the electric field signal receiving sensor and the magnetic field signal receiving sensor are operated in parallel. It is desirable to provide a new configuration of underground property exploration system and method configured to acquire underground images as well as underground images, but there are no devices or methods that satisfy all such requirements. to be.
- the present invention is to solve the problems of the prior art as described above, and therefore the object of the present invention is that a dipole type sensor for transmitting and receiving an electric field signal is mainly used and a loop, coil type sensor for transmitting and receiving a magnetic field signal is excluded. Therefore, in order to solve the problems of the conventional ground-penetrating radar (GPR) exploration techniques that have been relatively excluded, the underground image using the electric field reflected wave and the acquisition of the underground image using the magnetic field reflected wave have been relatively excluded. It is intended to provide an underground property exploration system and underground property analysis method using the same by operating a signal receiving sensor in parallel to acquire underground images using magnetic field reflected waves as well as underground images using existing electric field reflected waves.
- GPR ground-penetrating radar
- Another object of the present invention in order to solve the problems of the GPR survey techniques of the prior art that has been mainly obtained the underground image using the electric field reflected wave and the acquisition of the underground image using the magnetic field reflected wave as described above, It consists of a transmitting antenna located at a specific point on the ground and radiating electromagnetic pulse signals, and a pair of receiving antennas measuring electric and magnetic field signals formed by the above-mentioned radiation signals, thereby simultaneously conducting underground reactions of the electric field as well as the magnetic field.
- the purpose of the present invention is to provide an underground property exploration system and an underground property analysis method using the same, which are configured to more accurately and effectively identify the physical properties of the underground than by the conventional measurement.
- the underground underground radar (GPR) of the prior art which mainly acquires underground images using electric field reflected waves and acquires underground images using magnetic field reflected waves, has been excluded.
- the transmission antenna unit comprising at least one transmission antenna installed on the ground of a specific point predetermined for the area to be explored to radiate an electromagnetic wave pulse signal;
- a reception antenna unit including at least one pair of electric field signal receiving antennas and magnetic field signal receiving antennas for measuring electric and magnetic field signals respectively formed by radiation signals of the transmitting antenna unit;
- An analysis unit for analyzing physical properties of the underground medium based on the signals collected through the transmission antenna unit and the reception antenna unit;
- a control unit for controlling the overall operation of the exploration system, and by operating the electric field signal receiving sensor and the magnetic field signal receiving sensor in parallel, the underground image using the magnetic field reflected wave as well as the underground image using the existing electric field reflected wave.
- Underground property exploration system is provided, characterized in that it is also possible to obtain
- the transmission antenna of the transmission antenna unit any antenna can be used as long as it is an antenna capable of radiating an ultra-wideband electromagnetic wave pulse.
- the electric field signal receiving antenna of the receiving antenna unit is characterized in that it is configured in the form of a dipole antenna capable of receiving an ultra-wideband pulse signal is provided with two conductive radiators side by side based on the feed point.
- the magnetic field signal receiving antenna of the receiving antenna unit is characterized in that it is configured in the form of a loop antenna that is installed in the form of a single conductive radiator wound to receive an ultra-wideband pulse signal.
- the transmitting antenna is installed on the ground, and through the separate electric field signal receiving antenna and the magnetic field signal receiving antenna, respectively, the electric and magnetic fields formed by electromagnetic wave signals radiated from the transmitting antenna.
- the electric field by a single source obtained by theoretical modeling ( ) And magnetic field ( ) Is represented by the following equation,
- the underground physical property exploration system by measuring the electric and magnetic field signal by the radiation of a single transmission antenna in the air medium at each of the same point away from the transmission antenna through each receiving antenna ( And ),
- the ratio of electric and magnetic field sizes in air Is the intrinsic impedance (
- a correction function for correcting the ratio of the electric field signal and the magnetic field signal received at each of the antennas of the reception antenna unit based on the intrinsic impedance, when Is performed so that the respective antennas of the transmitting antenna portion and the receiving antenna portion are used in vacuum or air so that the ratio when the electric field signal and the magnetic field signal are obtained has a constant characteristic regardless of frequency. Characterized in that configured to have.
- the underground property exploration system is configured to perform the process for obtaining the correction function in the same manner for other mediums other than air, so that the correction function may be used in combination with two or more different types of media. It is characterized in that it is configured to.
- the underground physical property exploration system places the transmission antenna on the ground, not in the air, and places the electric and magnetic field signals radiated by the transmission antenna at the same point on the ground at a different point from the transmission antenna.
- the measurement is performed through the electric field signal and the magnetic field signal receiving antenna, respectively, so that in addition to the electric field response corresponding to the conventional GPR image, the magnetic field response or the measurement data for the magnetic field image can be obtained. It is characterized by.
- the underground physical property exploration system when the transmission antenna is installed on the ground to measure the electric field signal and the magnetic field signal, the characteristics of each of the receiving antenna is the correction function ( Is compensated for by the ratio of the receiver function ) Is eliminated so that a process for obtaining the properties of the underground medium by the measurement is performed using the following equation.
- the underground physical property analysis method it is configured to measure and analyze underground physical properties using the underground physical property exploration system described above, so that not only underground images using existing electric field reflected waves but also underground images using magnetic field reflected waves can be obtained.
- the physical property analysis method is provided, characterized in that it is configured to more accurately and effectively measure and analyze the physical properties of the underground medium.
- the basement configured to acquire not only the underground image using the existing electric field reflected wave but also the underground image using the magnetic field reflected wave.
- a dipole type sensor that transmits and receives an electric field signal is mainly used, and a loop and coil type sensor that transmits and receives a magnetic field signal is excluded, thereby acquiring underground images using electric field reflected waves.
- the acquisition of the underground image using the magnetic field reflected wave can solve the problems of the conventional ground-penetrating radar (GPR) exploration techniques that have been relatively excluded.
- GPR ground-penetrating radar
- An underground physical property exploration system comprising a transmitting antenna positioned at a specific point and radiating an electromagnetic wave pulse signal, and receiving antenna pairs measuring electric and magnetic field signals formed by the above-described radiation signal, and an underground physical property analysis method using the same
- FIG. 1 is a block diagram schematically showing the overall configuration of an underground physical property exploration system according to an embodiment of the present invention.
- FIG. 2 is a conceptual diagram schematically illustrating a process of measuring and analyzing physical properties of an underground medium by using an underground physical property exploration system according to an exemplary embodiment of the present invention shown in FIG. 1.
- FIG. 3 is a conceptual diagram schematically illustrating a process of measuring and analyzing physical properties of an underground medium by theoretical modeling.
- the present invention since a dipole type sensor that transmits and receives an electric field signal is mainly used, and a loop or coil type sensor that transmits and receives a magnetic field signal is excluded, an underground image using an electric field reflected wave is mainly obtained, and a magnetic field reflected wave is used.
- GPR ground-penetrating radar
- the present invention to solve the problems of the conventional GPR exploration techniques of the prior art that obtain the underground image using the electric field reflection wave and the acquisition of the underground image using the magnetic field reflection wave is relatively excluded, It consists of a transmitting antenna which is located at a specific point and radiates an electromagnetic wave pulse signal, and a pair of receiving antennas measuring the electric and magnetic field signals formed by the above-mentioned radiation signals, thereby simultaneously measuring the underground response of the magnetic field as well as the electric field.
- the present invention relates to an underground property exploration system and a method for analyzing underground properties using the same, which are configured to more accurately and effectively identify underground properties than before.
- FIG. 1 is a block diagram schematically illustrating the overall configuration of an underground physical property exploration system according to an embodiment of the present invention.
- the underground physical property exploration system 10 is largely divided to analyze underground physical properties using the principle of underground radar exploration such as a ground-penetrating radar (GPR).
- a transmission antenna unit 11 including at least one transmission antenna positioned at a specific point on the ground to radiate an electromagnetic wave pulse signal, and an electric and magnetic field signal formed by the radiation signal of the transmission antenna unit 11 described above.
- a received antenna unit 12 including at least one pair of electric field signal receiving antennas and magnetic field signal receiving antennas for measurement, and the signals collected through the transmitting antenna unit 11 and the receiving antenna unit 12.
- receiving antenna unit 12 and the exploration system 10 It may be configured to include a control unit 14 for controlling.
- the electric field signal reception antenna for measuring the electric field may be configured in the form of a dipole antenna having two conductive radiators side by side based on the feed point.
- the electric field signal receiving antenna for measuring the electric field may be configured in the form of the impedance of a part or the whole of the antenna arm in order to increase the resolution of the received signal.
- the magnetic field signal reception antenna for measuring the magnetic field may be configured in the form of a loop antenna wound around a single conductive radiator.
- the magnetic field signal reception antenna for measuring the magnetic field may be configured to be loaded with an impedance having a specific value at a single point of the antenna or a constant value for a plurality of sections. .
- the transmission antenna for copying the electromagnetic wave pulse signal may be configured as one of the antennas described above, but is not necessarily limited to the above configuration, in addition to the ultra-wideband electromagnetic wave Note that any antenna can be used as long as the pulse can be radiated.
- each of the antennas of the transmitting antenna portion 11 and the receiving antenna portion 12 described above is used in vacuum or air so that When the magnetic field signal is obtained, the ratio may be configured to include a calibration function to have a constant characteristic regardless of frequency.
- FIG. 2 is a conceptual diagram schematically illustrating a process of measuring and analyzing physical properties of an underground medium by using the underground physical property exploration system 10 according to the exemplary embodiment of the present invention.
- FIG. 3 is a conceptual diagram schematically illustrating a process of measuring and analyzing physical properties of an underground medium by theoretical modeling.
- FIG. Is the source signal copied through the transmitting antenna during the measurement, Is the receiver function of the electric field signal receiving antenna during the measurement, Is the receiver function of the magnetic field receiving antenna during the measurement, And Is the electric and magnetic fields (measured values) from the source signal, And Denotes the underground physical property system obtained by the measurement, respectively.
- FIG. I the source signal in theoretical modeling and is applied directly without an antenna, Is ignored because there is no antenna as a function of electric field receiver in theoretical modeling, Is ignored because there is no antenna as a function of magnetic field signal receiver in theoretical modeling, And Is the electric and magnetic fields (theoretical modeling values) from the source signals, And Denote each underground physical system obtained by theoretical modeling.
- the transmission antenna is installed on the ground
- the electric field and the magnetic field formed by the electromagnetic wave signals radiated by the transmitting antenna are received at the same point through separate electric field signal receiving antennas and magnetic field signal receiving antennas.
- Equation 1 the electric and magnetic fields by a single source obtained by theoretical modeling ( And ) can be represented by Equation 1 below.
- Equation 2 when Fourier transform of the above-described Equation 1 into the frequency domain is performed, the following Equation 2 is used.
- the inversion problem is a common analysis target of the geophysical exploration, and is a problem of obtaining a reaction due to the water component of the underground medium and obtaining an unknown component of the underground medium from it.
- the complete waveform inversion of the GPR survey data is used to update the properties of the underground medium (electric conductivity and permittivity) by iterative calculation method in order to minimize the residual between the measured radar survey data and the theoretical survey data simulated through numerical modeling. It is a technique to find the electrical conductivity and permittivity distribution, which are the physical properties of underground.
- the full waveform inversion algorithm requires a large amount of computation and computer resources because it compares the entire waveform in measurement data and theoretical modeling data.
- the time-domain signal of the transmitter that is actually radiated underground must be known or accurately predicted.
- the application of the electromagnetic pulse signal as the transmitting source is generally applied as it is at a specific point in the simulation, whereas in the measurement, since the pulse signal is fed to the transmitting antenna and then radiated from the antenna, the characteristics of the transmitting antenna Therefore, the distortion of the pulse signal is inevitable due to the electrical characteristics of the ground surface and the coupling state between the transmitting antenna and the ground surface.
- the transmission signal ( ) Is the response signal (
- the transmission signal is distorted by the transmission antenna, the subterranean physical properties, the coupling state of the antenna and the ground surface, the result of the full waveform inversion is not affected, and the accurate inversion result can be obtained.
- the same transmission source should be applied to the same transmission antenna when receiving the electric and magnetic field signals, respectively.
- the electric field signal caused by radiation of a single transmitting antenna in the air medium ( ) And magnetic field signals ( ) Is measured at each of the receiving antennas at the same point away from the transmitting antenna.
- the ratio of the electric and magnetic field sizes in air ( ) Is the intrinsic impedance Is defined.
- Equation 4 a function for correcting the ratio of the electric field and the magnetic field signal received at each receiving antenna; Can be obtained using the intrinsic impedance.
- the calibration function obtained in the above process can be obtained in the same manner in other media (eg, water) than air, and the calibration function obtained for two or more media can be used in combination. have.
- the above-described process is a process at the time of measurement, and in theoretical modeling, since the electric field and the magnetic field itself are calculated directly without transmitting and receiving antennas, the ratio of the electric field and magnetic field sizes in the air without a correction function This right To be obtained.
- the electric field signal ( ) And magnetic field signals ( ) are measured at the same point on the ground located at a different point from the transmitting antenna through each of the electric and magnetic field signal receiving antennas.
- the underground property exploration system and the underground property analysis method using the same according to the present invention can be implemented as described above.
- the present invention by implementing the underground physical property exploration system and the underground physical property analysis method using the same according to the present invention as described above, by operating in parallel with the electric field signal receiving sensor and the magnetic field signal receiving sensor By providing the underground property exploration system and underground property analysis method using the same, it is possible to obtain underground image using magnetic field reflected wave and underground image using magnetic field reflected wave.
- the ground-penetrating radar (GPR) exploration technique of the prior art which mainly acquires underground images using electric field reflected waves and acquires underground images using magnetic field reflected waves, due to the exclusion of loop and coil type sensors that transmit and receive signals. Solve their problems .
- An underground physical property exploration system comprising a transmitting antenna positioned at a specific point and radiating an electromagnetic wave pulse signal, and receiving antenna pairs measuring electric and magnetic field signals formed by the above-described radiation signal, and an underground physical property analysis method using the same
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Claims (10)
- 전기장 반사파를 이용한 지하 영상을 주로 획득하고 자기장 반사파를 이용한 지하영상의 획득은 배제되어 왔던 종래기술의 지하탐사 레이더(Ground-penetrating radar, GPR) 기법들의 문제점을 해결하기 위한 지하 물성 탐사시스템에 있어서,탐사하고자 하는 지역에 대하여 미리 정해진 특정 지점의 지면에 설치되어 전자기파 펄스 신호를 복사하는 적어도 하나의 송신안테나를 포함하여 이루어지는 송신안테나부;상기 송신안테나부의 복사신호에 의해 형성되는 전기장 및 자기장 신호를 각각 측정하기 위한 적어도 한 쌍의 전기장신호 수신안테나 및 자기장신호 수신안테나를 포함하여 이루어지는 수신안테나부;상기 송신안테나부와 상기 수신안테나부를 통하여 수집된 신호에 근거하여 지하 매질의 물성에 대한 분석을 수행하는 분석부; 및상기 탐사시스템의 전체적인 동작을 제어하는 제어부를 포함하여 구성됨으로써,상기 전기장신호 수신센서와 상기 자기장신호 수신센서를 병행하여 운용하는 것에 의해 기존의 전기장 반사파를 이용한 지하 영상뿐만 아니라 자기장 반사파를 이용한 지하 영상도 획득 가능하여 종래의 GPR 기법에 비해 상기 지하 매질의 물성을 더욱 정확하고 효과적으로 측정하고 분석할 수 있도록 구성되는 것을 특징으로 하는 지하 물성 탐사시스템.
- 제 1항에 있어서,상기 송신안테나부의 상기 송신안테나는,초광대역 전자기파 펄스를 복사할 수 있는 안테나라면 어떠한 안테나든지 사용 가능한 것을 특징으로 하는 지하 물성 탐사시스템.
- 제 1항에 있어서,상기 수신안테나부의 상기 전기장신호 수신안테나는,급전점을 기준으로 2개의 전도성 복사체가 나란히 설치되어 초광대역 펄스 신호를 수신할 수 있는 쌍극자 안테나의 형태로 구성되는 것을 특징으로 하는 지하 물성 탐사시스템.
- 제 1항에 있어서,상기 수신안테나부의 상기 자기장신호 수신안테나는,단일 전도성 복사체가 감긴 형태로 설치되어 초광대역 펄스 신호를 수신할 수 있는 루프 안테나의 형태로 구성되는 것을 특징으로 하는 지하 물성 탐사시스템.
- 제 1항에 있어서,상기 지하 물성 탐사시스템은,상기 송신안테나를 지면에 설치하고, 상기 송신안테나에서 복사하는 전자기파 신호에 의해 형성되는 전기장과 자기장을 각각 별도의 상기 전기장신호 수신안테나와 상기 자기장신호 수신안테나를 통하여 동일한 지점에서 수신하며,(여기서, 는 이론 모델링에서의 단일 전자기파 송신원, 는 이론 모델링에서의 지하 물성 특성을 나타내는 임펄스 응답(Impulse response), 는 이론 모델링에서의 전기장신호 수신안테나의 수신함수, 는 이론 모델링에서의 자기장신호 수신안테나의 수신함수를 나타냄)상기 수학식을 주파수영역으로 푸리에 변환(Fourier transform) 하여 이하의 수학식으로 변환하고,이하의 수학식을 이용하여 상기 전기장과 상기 자기장의 비를 구하는 처리가 수행되도록 구성됨으로써,응답신호()에서 송신신호()가 소거되는 것에 의해 측정시 상기 송신신호가 왜곡되더라도 완전파형역산 결과는 영향을 받지 않게 되어 종래의 GPR 기법에 비해 정확도가 높은 역산결과를 얻을 수 있도록 구성되는 것을 특징으로 하는 지하 물성 탐사시스템.
- 제 5항에 있어서,상기 지하 물성 탐사시스템은,이하의 수학식을 이용하여, 상기 고유임피던스에 근거하여 상기 수신안테나부의 각각의 안테나들에 수신된 상기 전기장신호 및 상기 자기장신호의 비율을 보정하는 보정함수(calibration function ; )를 구하는 처리가 수행되도록 구성됨으로써,상기 송신안테나부 및 상기 수신안테나부의 각각의 안테나가 진공 또는 공기 중에서 사용되어 상기 전기장신호 및 상기 자기장신호가 얻어졌을 때의 비율이 주파수에 관계없이 일정한 특성을 가지도록 구성되는 것을 특징으로 하는 지하 물성 탐사시스템.
- 제 6항에 있어서,상기 지하 물성 탐사시스템은,공기가 아닌 다른 매질에 대하여도 동일한 방법으로 상기 보정함수를 구하는 처리가 수행되도록 구성됨으로써,서로 다른 두 종류 이상의 매질에 대한 경우에도 상기 보정함수를 복합적으로 이용할 수 있도록 구성되는 것을 특징으로 하는 지하 물성 탐사시스템.
- 제 7항에 있어서,상기 지하 물성 탐사시스템은,공기 중이 아닌 지면상에 상기 송신안테나를 위치시키고, 상기 송신안테나에 의해 복사되는 전기장신호 및 자기장신호를 상기 송신안테나와는 다른 지점의 지면상의 동일 지점에 위치한 각각의 상기 전기장신호 및 상기 자기장신호 수신안테나를 통해 각각 측정하는 처리가 수행되도록 구성됨으로써,종래의 GPR 영상에 해당하는 전기장 반응에 더하여, 자기장 반응 또는 자기장 영상에 대한 측정데이터를 획득할 수 있도록 구성되는 것을 특징으로 하는 지하 물성 탐사시스템.
- 전기장 반사파를 이용한 지하 영상을 주로 획득하고 자기장 반사파를 이용한 지하영상의 획득은 배제되어 왔던 종래기술의 지하탐사 레이더(Ground-penetrating radar, GPR) 기법들의 문제점을 해결하기 위한 지하 물성 분석방법에 있어서,청구항 1항 내지 청구항 9항 중 어느 한 항에 기재된 지하 물성 탐사시스템을 이용하여 지하 물성을 측정하고 분석하도록 구성됨으로써,기존의 전기장 반사파를 이용한 지하 영상뿐만 아니라 자기장 반사파를 이용한 지하 영상도 획득 가능하여 종래의 GPR 기법에 비해 상기 지하 매질의 물성을 더욱 정확하고 효과적으로 측정하고 분석할 수 있도록 구성되는 것을 특징으로 하는지하 물성 분석방법.
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JP6567162B2 (ja) | 2019-08-28 |
CN107850688A (zh) | 2018-03-27 |
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