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WO1999004287A1 - Procede et dispositif pour la detection acoustique de mines et autres objets artificiels enterres - Google Patents

Procede et dispositif pour la detection acoustique de mines et autres objets artificiels enterres Download PDF

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Publication number
WO1999004287A1
WO1999004287A1 PCT/US1998/014443 US9814443W WO9904287A1 WO 1999004287 A1 WO1999004287 A1 WO 1999004287A1 US 9814443 W US9814443 W US 9814443W WO 9904287 A1 WO9904287 A1 WO 9904287A1
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WO
WIPO (PCT)
Prior art keywords
signal
vibration
signals
source
compliant
Prior art date
Application number
PCT/US1998/014443
Other languages
English (en)
Other versions
WO1999004287B1 (fr
Inventor
Dimitri M. Donskoy
Alexander M. Sutin
Original Assignee
Trustees Of The Stevens Institute Of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/895,122 external-priority patent/US5974881A/en
Application filed by Trustees Of The Stevens Institute Of Technology filed Critical Trustees Of The Stevens Institute Of Technology
Priority to JP2000503445A priority Critical patent/JP2001510901A/ja
Priority to US09/462,956 priority patent/US6415666B1/en
Priority to CA002296510A priority patent/CA2296510C/fr
Priority to AU85695/98A priority patent/AU750725B2/en
Priority to EP98936833A priority patent/EP0995129A4/fr
Priority to IL13400698A priority patent/IL134006A/en
Priority to KR1020007000431A priority patent/KR100552931B1/ko
Publication of WO1999004287A1 publication Critical patent/WO1999004287A1/fr
Publication of WO1999004287B1 publication Critical patent/WO1999004287B1/fr

Links

Classifications

    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H11/00—Defence installations; Defence devices
    • F41H11/12—Means for clearing land minefields; Systems specially adapted for detection of landmines
    • 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
    • G01N29/11—Analysing solids by measuring attenuation of acoustic waves
    • 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
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
    • 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
    • G01N29/40—Detecting the response signal, e.g. electronic circuits specially adapted therefor by amplitude filtering, e.g. by applying a threshold or by gain control
    • 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
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
    • 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
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/48—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by amplitude comparison
    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/04—Systems determining presence of a target
    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/86—Combinations of sonar systems with lidar systems; Combinations of sonar systems with systems not using wave reflection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/001—Acoustic presence detection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/01—Indexing codes associated with the measuring variable
    • G01N2291/014—Resonance or resonant frequency

Definitions

  • TITLE METHOD AND APPARATUS FOR ACOUSTIC
  • the present invention generally relates to a method and apparatus for acoustic detection of buried man-made obj ects, and more particularly to a method and apparatus which emits an acoustic signal comprising one or more frequencies and measures vibrations of the ground/sediment surface to detect buried objects such as mines.
  • the present invention also relates to a method and apparatus which emits an electromagnetic RF probing signal and sound or vibration signal (modulating signal), detects the reflected electromagnetic signal from the buried object, and processes the received signal, identifying the modulation caused by vibration.
  • metal detectors are used to detect mines by measuring the disturbance of an emitted electromagnetic field caused by the presence of metallic objects in the ground.
  • magnetometers are employed. These sensors measure the disturbance of the earth's natural electromagnetic field. Both types of detectors cannot differentiate a mine from metallic debris, leading to 100-1000 false alarms for each real mine.
  • most of the modern antipersonnel mines are made of plastic with very few or no metal parts, making them undetectable by metal detectors.
  • House, et al.mix U.S. Patent No. 5,357,063 discloses a method and apparatus for acoustic energy identification of objects buried in soil. This method identifies a buried object by viewing the images of the acoustic energy reflected from the soil and, therefore, is unable to differentiate a mine from debris with the similar acoustic reflectivity.
  • Rogers, et al.. U.S. Patent No. 5,563,8408 compares a reflected signal with a reference signal reflected from the ground where presumably no buried objects are located. The differences between these two signals indicates the presence of an object.
  • the drawback of this method is that any variations in the physical properties of the ground (density, porosity, moisture content, etc.) as well as the presence of non-target objects (rocks, tree and grass roots, debris, etc.) will create a difference from the reference signal and, consequently, lead to a high rate of the false alarms.
  • U.S. Patent No. 4,922,467 discloses an acoustic detection method is based on comparison of the measured "signature" of the object with the predetermined and stored reference “signatures.”
  • the signature is derived from the properties of the object such as acoustic impedance, absorption, velocity and the porosity.
  • This method is intended to identify the substance inside an enclosure and may work well for detecting and identifying substances in enclosures with known acoustical properties such as a suitcase, mail package, etc.
  • this method may not work at all because the acoustical properties of the earth may vary in wide ranges which cannot be predicted.
  • U.S. Patent No. 4,439,485 discloses a sonar system for identification of certain resonant body target such as mine.
  • the system radiates two acoustic signals of different frequencies F, and F 2 which are transmitted toward the target and the acoustic returns are separated into the component frequencies, detected, and thereafter subtracted from one another.
  • a signal above a threshold value indicates a resonant body target.
  • the received signals have the same F, and F 2 frequencies as the radiated signals.
  • the frequencies F, and F 2 must be within the resonance frequency of the expected target.
  • a processing algorithm subtracts envelopes of received signals with the frequencies Fj and F 2 looking at the time- variation of the resulting signal due to a resonance "ringing" effect from resonating target.
  • U.S. Patent No. 3,705,381 discloses a resonant target sonar system for detection and classification of underwater targets. The system broadcasts two signals: one is a high frequency signal, and the other one is a low frequency signal with the frequency "substantially similar to the resonant frequency of the target.” This patent searches resonance targets and requires prior knowledge of their resonance frequencies. Processing of the signal consists of subtraction (in time domain) of two high frequency signals reflected from the target: one is reflected from the target during the broadcasting resonant low frequency signal, and another one without resonant signal.
  • nonlinear vibrating signals are received from the surface by means of a sensor.
  • the amplitude of the measured nonlinear signals indicates the presence of an acoustically compliant object such as a mine.
  • the acoustically compliant object can be identified when the probe signal includes more than one frequency.
  • the present invention employs the effect of modulation of a probing RF signal by the vibration of a buried object.
  • the invention employs a RF probing signal capable of penetrating underground and an acoustic signal. These signals are transmitted toward a target.
  • the acoustic signal excites vibration of the buried object.
  • Such vibration is much larger for acoustically compliant objects such as mines, unexploded ordinance, pipes and other shell-type object, as compared with much less compliant solid objects (rocks, tree roots, etc.).
  • the RF probing signal reaches the object, reflects back and is then received by a receiving antenna. Vibration of the compliant objects causes modulation of the reflected RF signal. The presence of this modulation serves as an object discrimination characteristic, since less compliant non-target objects (rocks, tree roots, etc.) reflect the RF signal without the modulation.
  • FIG. 1 is a schematic diagram of an embodiment of the apparatus of the present invention.
  • FIG. 2 is a schematic diagram of another embodiment of the apparatus of the present invention.
  • FIG. 3 is a schematic diagram of an experimental apparatus used for conducting experiments according to the present invention.
  • FIGS. 4a, 4b, and 4c show schematic diagrams and a corresponding graph of the spectrum level of the difference frequency signal.
  • FIGS. 5a, 5b and 5c show schematic diagrams and a corresponding graph of nonlinear frequency responses.
  • FIG. 6 is a schematic diagram of another embodiment of the apparatus of the present invention.
  • FIG. 7 is a schematic diagram of another embodiment of the apparatus of the present invention.
  • the present invention relates to a method and apparatus for the acoustic detection of buried, man-made objects such as mines.
  • a schematic of one embodiment of the apparatus of the present invention is shown in the FIG. 1.
  • the detecting apparatus is generally indicated at 10.
  • a probe sound signal is emitted by one or more sound sources 12 and 14 suspended above the ground.
  • the probe signal can be created with a signal generator 16 and a power amplifier 18.
  • Each of the one or more sound sources 12 and 14 emits a signal, preferably a finite duration (burst) sinusoidal signal, with a given frequencies such as frequencies f, and f 2 .
  • the sound sources could be electric powered (such as loudspeakers, etc.) or air powered (air horns).
  • the signal generator and the power amplifier can be substituted with a compressed gas source.
  • the probe signal is emitted by an acoustic (seismic) source (sources) 112 located directly on the ground.
  • the probe signal penetrates the ground and interacts with a compliant buried object 8 such as a mine.
  • a compliant object is an object whose compliance in the specified frequency range is different from the compliance of the surrounding media. Mines have shells which are generally compliant. Acoustic energy is used as a probe for a compliant object.
  • a signal with combination frequencies f, ⁇ f 2 is generated.
  • This signal causes vibration of the surface of the ground above the buried object.
  • This vibration is received with a sensor 20 or 120 and processed by a processor 22 or 122 to extract the signal with the combination frequencies f, ⁇ f 2 .
  • This signal can then be displayed by display 24 or 124.
  • the receiving sensor 20 or 120 could be an accelerometer (placed on the ground-contact sensor) or a microphone or ultrasonic (or laser) vibrometer suspended above the ground. Additionally, it should be pointed out that such sensing can be performed remotely.
  • a signal with the combination frequencies f, ⁇ f 2 exceeding a predetermined threshold level, which is set during calibration of the apparatus, indicates the presence of a compliant object 8. While the probe signal is in one frequency range, the received signal, or vibration signal can be in a different frequency range.
  • the method of the present invention can be further enhanced by implementing the measurement of the nonlinear frequency response of the object.
  • the nonlinear frequency response can be obtained by sweeping one or both excitation frequencies fj and f 2 within the range ⁇ f, or by radiating a multi-frequency signal in the same range ⁇ f. Observation of the difference frequency f, - f 2 , while sweeping, for example f,, will produce a nonlinear frequency response of the object in the frequency range ⁇ f. It was observed experimentally, that a compliant object produces a resonance-like response, while non-compliant objects return practically no response at all.
  • the observation of the resonance-like nonlinear response can be used, in addition to the combination frequency observation, to further increase the detection probability of the method of the present invention. It was also experimentally observed that the nonlinear resonance frequency varies for various objects. This, therefore, can be additionally utilized for identification of a particular object. Accordingly, a reference nonlinear frequency response can be used for object identification. There is no need for a reference signal for object detection.
  • the experimental setup 210 employs two signal generators 216 and 217 respectively, supplying sinusoidal signals with the frequencies f, and f 2 , respectively, the summing and gating devices 232 and 234 forming a probe bi-harmonic burst signal.
  • the duration of the burst is controlled with a pulse generator 236.
  • the probe signal radiates from a loudspeaker 212 suspended above the ground where the object 8 is buried.
  • the vibration of the ground surface is picked up with an accelerometer 220 and processed with a spectrum analyzer 244 after the signal is fed through an amp 242.
  • FIG. 4 shows examples of the spectral component of the difference frequency, fj - f 2 , received from a compliant plastic container (FIG. 4a), a background level (no object is buried) (FIG. 4b), and solid steel disk (FIG. 4c).
  • the level of the signal from the compliant plastic container is 16 times greater than the signal from the solid non-compliant steel disk, as well as the background signal.
  • FIG. 5 depicts examples of the nonlinear frequency responses from two different compliant objects, namely, a four and one half inch plastic cylindrical container (FIG. 5a) a four inch steel disk (FIG. 5b) and a four inch solid steel container (FIG. 5c).
  • FIG. 6 shows another embodiment of the present invention wherein two signal generators 316 feeds source 312 to create a probe signal to vibrate compliant object 8.
  • the source 313 emits a high frequency ultrasonic signal to pick up vibration.
  • the vibrations are sensed by sensor 314 and fed to signal acquisition 325 such as an Ultrasonic Vibrometer, and then fed to signal processing 323 wherein the signal can be processed and displayed.
  • the present invention is based on the effect of nonlinear interactions between the compliant housing of the buried object and the surrounding media.
  • a low frequency (below 5000 Hz) air/water-borne or solid-borne sound waves (the probe signal) containing two or more frequencies are utilized.
  • This probe signal penetrates into the ground/sediments and excites vibrations of the buried object.
  • acoustically compliant objects such as mines (as opposed to stones, solid metal objects, bricks, etc., which are much less compliant) these vibrations lead to "bouncing" of the object boundaries against the surrounding medium.
  • the acoustical manifestation of this phenomenon is the nonlinear distortion of the probing signal including the generation of harmonics and acoustic waves with the combination frequencies (nonlinear signals). These nonlinear vibrating signals are picked up from the surface of the ground/sediments with a sensor. The amplitude of the measured nonlinear signals indicates the presence of an acoustically compliant object. This allows for the detection of non-metallic objects (e.g. plastic mines and pipes), with non-sensitivity to less-compliant objects such as rocks, solid metal objects, tree roots, etc.
  • non-metallic objects e.g. plastic mines and pipes
  • less-compliant objects such as rocks, solid metal objects, tree roots, etc.
  • the method of the present invention can be practiced in a portable or semi- stationary mode.
  • the method includes producing an acoustic signal such as a sound or seismic acoustic signal which is directed either through water, air, or sediments to the ground and then into the ground where a mine or other compliant object may be buried.
  • the acoustic signal can be emitted by means of loudspeakers, air horns, or a seismic source or other means known in the art.
  • the signal may include more than one frequency component and may include one or more sources for emitting the signal.
  • the signal travels into the ground where it encounters a compliant object and causes the compliant object to vibrate.
  • This vibration impacts the surrounding medium and causes same to vibrating, creating a nonlinear distortion and generating harmonics and acoustic waves.
  • These vibrations signals received by a sensor on or above the surface of the ground or other medium. These signals are fed through a processor to analyze same for determination of the existence of a compliant object.
  • This embodiment of the invention employs a signal generator 416, a power amplifier for amplifying the signal and a source 412 for emitting the acoustic signal.
  • the acoustic signal vibrates a compliant object 8.
  • An RF signal generator 417 is employed to create a ground penetrating RF probing signal.
  • the RF probing signal is reflected back to a sensor 414 and then fed into a demodulator 425 and then to a signal processor 423 such as a computer.
  • the vibration of the compliant object caused by the acoustic signal modulates the reflected RF signal to allow this embodiment of the invention to serve as an object discriminator.
  • the RF signal can be a burst sinusoidal signal and may be synchronously admitted with a RF transmitter also suspended above the ground. Both acoustic and the RF signal penetrate into the ground.
  • the acoustic signal excites vibration of the buried mechanically compliant target.
  • This vibration cause a phase or frequency modulation of the RF signal reflected from the vibrated target.
  • This modulated signal is then received by the receiver, demodulated and analyzed to detect the presence of the modulation frequencies.
  • the presence of modulation frequencies indicates the presence of the compliant target such as a mine.
  • One mode may involve a CW air or solid borne signal causing the Doppler shift of a reflected RF probing signal.
  • Another mode may employ a more complex acoustic signal, such as a dual frequency (frequencies f, and f 2 ) signal.
  • This signal in addition to vibration excitation of the target with the same frequencies f, and f 2 , causes a nonlinear transformation of target vibration into the combination frequencies f, + f 2 and ⁇ - f due to the nonlinear interaction of the vibrating target interface and the surrounding soil.
  • These frequencies will also produce the modulation of the RF signal, further enhancing the discrimination capabilities of the invented detection technique.
  • the processing unit of the device of this invention incorporates the means or steps of demodulation of the received signal by multiplying the received RF signal by a reference signal corresponding to the initially radiated RF signal, low-pass filtering, and post-processing such as the spectral analysis to identify the presence of the modulating frequencies.
  • the invented technique can be utilized as a stand alone device or combined with existing target detection devices such as ground penetrating RADAR.
  • the GPR's, RF transmitting/receiving equipment can be combined to implement invented technique. This can be a complimentary mode of operation of GPR, greatly enhancing its discrimination capability.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Acoustics & Sound (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

Cette invention se rapporte à un dispositif (10) qui fait usage d'un signal acoustique d'une ou de plusieurs fréquences pour pénétrer le sol, l'eau ou des sédiments et pour faire vibrer un objet (8) enterré et doté d'une certaine élasticité acoustique. Lorsque ces signaux acoustiques rencontrent un objet (8) doté d'une certaine élasticité acoustique tel qu'une mine, ils mettent en vibration l'objet (8) élastique, et font ainsi vibrer l'objet (8) à élasticité acoustique contre les limites du milieu environnant du type sédiment terrestre, lesdits signaux créant ainsi une distorsion non linéaire du signal de déminage et générant notamment des harmoniques et des ondes acoustiques dotées de fréquences de combinaison (signaux non linéaires). Ces signaux oscillants issus de la surface sont reçus par un capteur (20). L'amplitude des signaux non linéaires mesurés indique la présence d'un objet (8) doté d'une certaine élasticité acoustique, tel qu'une mine. La présente invention se rapporte à un procédé et à un appareil qui émet un signal de déminage R.F. électromagnétique et un signal acoustique ou un signal oscillant (signal de modulation), détecte le signal électromagnétique réfléchi par l'objet (8) enterré, et traite le signal reçu, identifiant ainsi la modulation provoquée par la vibration.
PCT/US1998/014443 1997-07-16 1998-07-15 Procede et dispositif pour la detection acoustique de mines et autres objets artificiels enterres WO1999004287A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2000503445A JP2001510901A (ja) 1997-07-16 1998-07-15 鉱石及びその他の埋設された人工物の音響検出装置及び方法
US09/462,956 US6415666B1 (en) 1997-10-07 1998-07-15 Method and apparatus for acoustic detection of mines and other buried man-made objects
CA002296510A CA2296510C (fr) 1997-07-16 1998-07-15 Procede et dispositif pour la detection acoustique de mines et autres objets artificiels enterres
AU85695/98A AU750725B2 (en) 1997-07-16 1998-07-15 Method and apparatus for acoustic detection of mines and other buried man-made objects
EP98936833A EP0995129A4 (fr) 1997-07-16 1998-07-15 Procede et dispositif pour la detection acoustique de mines et autres objets artificiels enterres
IL13400698A IL134006A (en) 1997-07-16 1998-07-15 Method and device for acoustic detection of man-made mines and objects, other buried
KR1020007000431A KR100552931B1 (ko) 1997-07-16 1998-07-15 지뢰 및 다른 매설 인조물의 어쿠스틱 탐지 방법 및 장치

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/895,122 US5974881A (en) 1997-07-16 1997-07-16 Method and apparatus for acoustic detection of mines and other buried man-made objects
US08/895,122 1997-07-16
US6257697P 1997-10-07 1997-10-07
US60/062,576 1997-10-07

Publications (2)

Publication Number Publication Date
WO1999004287A1 true WO1999004287A1 (fr) 1999-01-28
WO1999004287B1 WO1999004287B1 (fr) 1999-04-01

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EP (1) EP0995129A4 (fr)
JP (1) JP2001510901A (fr)
KR (1) KR100552931B1 (fr)
AU (1) AU750725B2 (fr)
CA (1) CA2296510C (fr)
IL (1) IL134006A (fr)
WO (1) WO1999004287A1 (fr)

Cited By (5)

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WO2001075485A1 (fr) * 2000-04-03 2001-10-11 Ewootec Co. Ltd. Systeme de gestion d'objet enterre
GB2385127A (en) * 2002-02-11 2003-08-13 Roke Manor Research An underwater vehicle for detecting buried objects
JP2011101821A (ja) * 1999-05-03 2011-05-26 Remon Medical Technologies Ltd 埋め込み可能な音響バイオセンシングシステムおよび方法
US9731141B2 (en) 2007-06-14 2017-08-15 Cardiac Pacemakers, Inc. Multi-element acoustic recharging system
US12032109B2 (en) 2017-06-08 2024-07-09 Total Sa Method for acquiring a seismic dataset over a region of interest

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JP3552203B2 (ja) * 1999-09-09 2004-08-11 株式会社東芝 埋設物探知方法及び埋設物探知装置
US7283874B2 (en) 2000-10-16 2007-10-16 Remon Medical Technologies Ltd. Acoustically powered implantable stimulating device
US8593107B2 (en) 2008-10-27 2013-11-26 Cardiac Pacemakers, Inc. Methods and systems for recharging an implanted device by delivering a section of a charging device adjacent the implanted device within a body
JP5448153B2 (ja) * 2009-08-05 2014-03-19 Ｎｅｃネットワーク・センサ株式会社 人工物検出システム、及び該システムに用いられる人工物検出方法
JP2012013522A (ja) * 2010-06-30 2012-01-19 Korea Atomic Energy Research Inst 超音波を用いる低周波数振動加振方法および装置
KR101348989B1 (ko) 2012-03-21 2014-01-10 재단법인 국방기술품질원 전투화에 탈부착이 가능한 지뢰탐지장치
CN102645674B (zh) * 2012-04-17 2013-12-18 河北煤炭科学研究院 工作面煤层采前立体探测方法

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AU8569598A (en) 1999-02-10
CA2296510A1 (fr) 1999-01-28
WO1999004287B1 (fr) 1999-04-01
KR20010021867A (ko) 2001-03-15
JP2001510901A (ja) 2001-08-07
EP0995129A1 (fr) 2000-04-26
IL134006A (en) 2004-07-25
KR100552931B1 (ko) 2006-02-22
CA2296510C (fr) 2006-02-07
AU750725B2 (en) 2002-07-25
IL134006A0 (en) 2001-04-30
EP0995129A4 (fr) 2000-10-18

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