WO2005085902A1 - Appareil et procede de detection d'un objet enterre au moyen d'une onde solitaire - Google Patents

Appareil et procede de detection d'un objet enterre au moyen d'une onde solitaire Download PDF

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Publication number
WO2005085902A1
WO2005085902A1 PCT/KR2005/000661 KR2005000661W WO2005085902A1 WO 2005085902 A1 WO2005085902 A1 WO 2005085902A1 KR 2005000661 W KR2005000661 W KR 2005000661W WO 2005085902 A1 WO2005085902 A1 WO 2005085902A1
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WIPO (PCT)
Prior art keywords
reflected wave
acoustic
buried object
sensor
solitary
Prior art date
Application number
PCT/KR2005/000661
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English (en)
Inventor
Do-Young Kim
Original Assignee
Do-Young Kim
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
Application filed by Do-Young Kim filed Critical Do-Young Kim
Priority to JP2007502714A priority Critical patent/JP2007528498A/ja
Publication of WO2005085902A1 publication Critical patent/WO2005085902A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
    • B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
    • B66B5/185—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces by acting on main ropes or main cables
    • 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

Definitions

  • the present invention relates to an apparatus and a method for detecting a buried object. More specifically, the present invention relates to an apparatus and a method for detecting a buried object using solitary waves.
  • a natural and/or an artificial buried object(s) may be buried in a medium in which the natural and/or the artificial buried object(s) may have different physical and/or chemical properties from those of the medium.
  • a buried object and/or the type of the buried object itself such as a typical example of a land mine buried under ground. It is simple to bury mines. However, it is extremely difficult to find and remove the mines which are buried over a wide area because it is not easy to determine exact points where the mines are buried, and more importantly the points of the buried mines may be changed due to various environmental factors as well.
  • Some mine detection methods in prior art may determine the buried points of mines by using animals having a keen sense of smell, or by a prodding and excavation method. However, it is very inefficient in terms of time to find mines buried over a very wide area through the prior art mine detection methods.
  • metal detectors have been used as a detection method for detecting metal mines in prior art. However, because the prior art metal detectors respond to all the metals buried in a medium, it is very hard to detect only the metal mines and more importantly it is impossible to detect plastic mines which are currently widely used.
  • a method for detecting a nitrogen component which is buried under ground has been proposed and used, based on the fact that a nitrogen component is included in gunpowder contained in a mine.
  • this prior art method detects gamma-rays emitted from a nitrogen component included in gunpowder and determines whether a mine is buried or not.
  • this prior art method has a problem in terms of a practical use because it requires a huge sized oscillator in order to excite nitrogen included in gunpowder and a further problem arises in particular in terms of portability due to the use of a huge sized oscillator.
  • Other prior art detection methods for detecting a mine and/or a buried object may be classified depending on a source wave such as X-ray, ultrasonic wave, microwave, and electromagnetic wave, etc., which is used for detecting a buried object.
  • An object of the present invention is to solve the prior art problems by providing a novel apparatus and a method for detecting a buried object which improves reliability and exactness in detecting a mine and/or a buried object by using solitary waves as a new source wave and processing effectively a reflected wave of the solitary waves by means of highly sensitive sensors.
  • an apparatus for detecting a buried object using solitary waves comprises an acoustic source for emitting a solitary wave; at least one first acoustic sensor for generating a first reflected wave signal corresponding to a reflected wave of the solitary wave emitted from the acoustic source; at least one second acoustic sensor for generating a second reflected wave signal corresponding to a reflected wave of the solitary wave emitted from the acoustic source; and a control unit for driving the acoustic source to emit the solitary wave toward a medium expected to have the buried object, receiving the first and the second reflected wave signals from the first acoustic sensor and the second acoustic sensor, respectively, and determining the existence of the buried object in the medium based on the first and the second reflected wave signals.
  • an apparatus for detecting a buried object using solitary waves comprises an acoustic source for emitting a solitary wave; at least one acoustic sensor for generating a reflected wave signal corresponding to a reflected wave of the solitary wave emitted from the acoustic source; and a control unit for driving the acoustic source to emit the solitary wave toward a medium expected to have the buried object, receiving the reflected wave signal from the acoustic sensor, and determining the existence of the buried object in the medium based on the reflected wave signal.
  • a detector for detecting a buried object having an apparatus for detecting a buried object using solitary waves
  • the apparatus for detecting a buried object comprises an acoustic source for emitting a solitary wave; at least one first acoustic sensor for generating a first reflected wave signal corresponding to a reflected wave of the solitary wave emitted from the acoustic source; at least one second acoustic sensor for generating a second reflected wave signal corresponding to a reflected wave of the solitary wave emitted from the acoustic source; and a control unit for driving the acoustic source to emit the solitary wave toward a medium expected to have the buried object, receiving the first and the second reflected wave signals from the first acoustic sensor and the second acoustic sensor, respectively, and determining the existence of the buried object in the medium based on the first and the second reflected wave signals; wherein the detector
  • a method for detecting a buried object using solitary waves comprises the steps of emitting a solitary wave toward a medium; generating a first reflected wave signal corresponding to a reflected wave of the solitary wave; generating a second reflected wave signal corresponding to a reflected wave of the solitary wave; calculating a first characteristic frequency for the first reflected wave signal; calculating a second characteristic frequency for the second reflected wave signal; determining the existence of the first characteristic frequency in a first predetermined frequency range; determining the existence of the second characteristic frequency in a second predetermined frequency range; and determining that a known buried object corresponding to both the first and the second predetermined frequency ranges exists in the medium, when the first and the second characteristic frequencies respectively exist in the first and the second predetermined frequency ranges.
  • Fig. 1 is a block diagram of an apparatus for detecting a buried object in accordance with an embodiment of the present invention.
  • Fig. 2 shows a side view and a plan view of a structure for a GMI sensor which is applied to an apparatus for detecting a buried object in accordance with an embodiment of the present invention.
  • Fig. 1 is a block diagram of an apparatus for detecting a buried object in accordance with an embodiment of the present invention.
  • Fig. 2 shows a side view and a plan view of a structure for a GMI sensor which is applied to an apparatus for detecting a buried object in accordance with an embodiment of the present invention.
  • Fig. 1 is a block diagram of an apparatus for detecting a buried object in accordance with an embodiment of the present invention.
  • Fig. 2 shows a side view and a plan view of a structure for a GMI sensor which is applied to an apparatus for detecting a buried object in accordance with an embodiment of the present invention.
  • FIG. 3 is a graph showing frequency characteristics in a reflected wave of solitary waves received by a GMI sensor in accordance with the present invention.
  • Fig. 4 shows a side view and a plan view of a structure for an SCM sensor which is applied to an apparatus for detecting a buried object in accordance with one embodiment of the present invention.
  • Fig. 5 is a graph showing frequency characteristics in a reflected wave in accordance with the present invention.
  • Fig. 6 is a perspective view of a detector for detecting a buried object in accordance with an embodiment of the present invention.
  • Fig. 7 is a view of a lower body of a detector for detecting a buried object seen from "A" direction as illustrated in Fig. 6.
  • Fig. 8 is a flow chart showing a method for detecting a buried object using solitary waves in accordance with an embodiment of the present invention.
  • FIG. 1 illustrates a block diagram of an apparatus 10 for detecting a buried object in accordance with an embodiment of the present invention. As illustrated in Fig.
  • the apparatus 10 for detecting a buried object in accordance with an embodiment of the present invention comprises an acoustic source 130 for emitting a solitary wave; at least one first acoustic sensor 160 for generating a first reflected wave signal corresponding to a reflected wave of the solitary wave emitted from the acoustic source 130; at least one second acoustic sensor 165 for generating a second reflected wave signal corresponding to a reflected wave of the solitary wave emitted from the acoustic source 130; and a control unit 100 for driving the acoustic source 130 to emit the solitary wave toward a medium 190 expected to have the buried object, receiving the first and the second reflected wave signals from the first acoustic sensor 160 and the second acoustic sensor 165, respectively, and determining the existence of the buried object 195 in the medium 190 based on the first and the second reflected wave signals.
  • the control unit 100 includes an electronic control unit 110 (hereinafter referred to "ECU") which controls overall functions of the control unit 100.
  • ECU 110 may be embodied by one or more microprocessors operated by predetermined programs, and the predetermined programs may include a series of instructions for performing respective steps of a method for detecting a buried object in accordance with an embodiment of the present invention as illustrated in Fig. 8.
  • the control unit 100 has a memory 115 which stores various data used for performing the functions of ECU 110.
  • the memory 115 pre-stores a first characteristic frequency to be searched by a first acoustic sensor 160 and a second characteristic frequency to be searched by a second acoustic sensor 165 for respective buried objects to be detected, and the error scopes for the first characteristic frequency and the second characteristic frequency.
  • the memory 115 stores, as its first frequency range, a peak frequency range measured by the first acoustic sensor 160 embodied by a Giant Magnetic Impedance sensor (hereinafter referred to "GMI sensor”) for reflected waves of solitary waves which are reflected from the plastic mines, and also stores, as its second frequency range, a peak frequency range measured by the second acoustic sensor 165 embodied by a Micro Electro-Mechanical Systems sensor (hereinafter referred to "MEMS sensor”) having a cantilever for the reflected waves of the solitary waves which are reflected from the plastic mines.
  • GMI sensor Giant Magnetic Impedance sensor
  • MEMS sensor Micro Electro-Mechanical Systems sensor
  • the MEMS sensor described above may be embodied by Silicon Cantilever Magnetometer sensor (hereinafter referred to "SCM sensor").
  • SCM sensor Silicon Cantilever Magnetometer sensor
  • ECU 110 is possible to determine the existence of burial of plastic mines by comparing real peak frequencies measured by the first and the second acoustic sensors 160,165, respectively, for unknown buried objects with pre-stored peak frequency ranges for known buried objects as described above.
  • the control unit 100 also includes a function generator 120 for acoustic source which receives a signal for driving the acoustic source 130 from the ECU 110 and generates a signal for driving the acoustic source 130; and an amplifier 125 for amplifying the signal from the function generator 120 for acoustic source and transferring it to the acoustic source 130.
  • the acoustic source 130 applied to the present invention may be embodied by, for example, an electrically drivable speaker and is controlled to generate solitary waves by the control unit 100.
  • solitary waves have a propagation characteristic without any interference and dispersion between waves during superposition, unlike a general characteristic of a wave.
  • solitary waves maintain its original wavelength even when passing through a medium which has a buried object or when reflected by a buried object.
  • solitary waves cannot pass through a medium having a natural frequency identical to a characteristic frequency of the solitary waves, and rather are reflected from the medium (frequency characteristic).
  • the control unit 100 detects the reflected waves and searches frequency components thereof and therefore it is possible to determine the existence of the unknown buried object and the type thereof.
  • the control unit 100 includes a function generator 140 for sensor which drives the first and the second acoustic sensors 160,165.
  • the first and the second acoustic sensors 160,165 are respectively embodied by a GMI sensor (see Fig. 2) and SCM sensor (see Fig. 4), and operation performances thereof depend on the characteristics of an external electric power.
  • a frequency range of 100kHz ⁇ 10MHz may be used for driving a GMI sensor and especially a GMI sensor operates most sensitively to a change of magnetic field near about 1 MHz.
  • the function generator 140 for sensor generates a frequency of about 1 MHz and a voltage signal of about 1V (hereinafter referred to "driving signal") and feeds them to the first and the second acoustic sensors 160,165.
  • driving signal generated by the function generator 140 for sensor
  • the scope of the present invention is not limited to this range of frequency.
  • optimal operations of the first and the second acoustic sensors 160,165 may be variably set up depending on the different specifications thereof.
  • the function generator 140 for sensor is to be one, the scope of the present invention shall not be limited thereto.
  • the function generator 140 for sensor may be provided separately for driving the first acoustic sensor 160 embodied by a GMI sensor and for driving the second acoustic sensor 165 embodied by a SCM sensor. Also, since the output value from a SCM sensor to be used for the second acoustic sensor 165 is related to capacitance thereof, the control unit 100 is provided with a capacitance bridge circuit 167 in order to obtain a reduced value from the output value. From the above description, the function generator 140 for sensor is described to feed a driving signal to the second acoustic sensor 165. However, if the capacitance bridge circuit 167 is used, then the second acoustic sensor 165 embodied by an SCM sensor may operate regardless of the driving signal fed from the function generator
  • the control unit 100 further comprises a first lock-in amplifier and a second lock-in amplifier.
  • the first lock-in amplifier 170 receives a signal generated from the first and the second acoustic sensors 160, 165 (hereinafter referred to "generated signal") and also receives a driving signal outputted from the function generator 140 for sensor. Then, the first lock-in amplifier 170 compares the driving signal with the generated signal and outputs a deviation between the generated signal and the driving signal to the second lock-in amplifier 150.
  • a detection signal indicating the deviation between the generated signal and the driving signal by the first lock-in amplifier 170 directly shows an intensity of a received reflected wave of a solitary wave emitted from the acoustic source 130.
  • the detection signal of the first lock-in amplifier 170 is also transmitted to a display device 105. Further, the signal outputted from the amplifier 125 is transmitted to the acoustic source 130 and is also transmitted to the second lock-in amplifier 150 and the display device 105 simultaneously.
  • the second lock-in amplifier 150 can determine a specific frequency of the solitary wave emitted from the acoustic source 130 by using a signal received from the amplifier 125 (hereinafter referred to "reference signal").
  • the second lock-in amplifier 150 searches whether the detection signal received from the first lock-in amplifier 170 contains the specific frequency component of a reflected wave of the solitary wave from the reference signal.
  • the second lock-in amplifier 150 calculates the intensity of the reflected wave of the solitary wave (seen Fig. 5), and transmits the calculated intensity to the ECU 110. From a method described above, it is possible to know an intensity of the received reflected wave of the solitary wave for a specific frequency. Thus, by emitting solitary waves having various frequencies through the acoustic source 130 and calculating the intensities of the received reflected waves of the respective solitary waves, it is possible to obtain a graph of frequency characteristics (Figs. 3 and 5) where the medium 190 and the buried object 195 respectively reflect corresponding solitary waves.
  • Fig. 2 shows a side view and a plan view of a structure for a GMI sensor 160 which is applied to an apparatus 10 for detecting a buried object in accordance with an embodiment of the present invention.
  • the GMI sensor 160 includes a membrane 210 which responds to external vibrations. When the membrane 210 receives an external vibration, a change of high-frequency impedance occurs in the membrane 210 and is detected by electrodes 220 connected to the membrane 210 by lead lines.
  • the GMI sensor 160 is typically used for measuring a fine magnetic field.
  • the GMI sensor 160 described above causes a vibration of the membrane 210 when a solitary wave is incident onto the membrane 210 of the GMI sensor 160, and thus can be used for measuring an incident solitary wave.
  • a GMI sensor typically used for measuring a fine magnetic field may be used as the first acoustic sensor 160 of the apparatus 10 for detecting a buried object in order to measure a solitary wave.
  • the membrane 210 of the GMI sensor 160 used in an embodiment of the present invention may include a material showing an impedance valve phenomenon formed by a method disclosed in Korean laid- open patent publication No. 2001-86630 (Patent No. 383564 entitled "a method for forming an impedance valve type material and a magnetic sensor using the same").
  • the GMI sensor 160 disclosed in Korean laid-open patent publication No. 2001-86630 is incorporated by reference herein.
  • the detailed description of a specific structure and its function of the GMI sensor 160 is disclosed in Korean laid-open patent publication No. 2001-86630 in detail and thus may be omitted herein.
  • FIG. 3 is a graph showing frequency characteristics in a reflected wave of solitary waves received by a GMI sensor in accordance with the present invention.
  • the graph in Fig. 3 shows a scanned drawing by a GMI sensor at 10Hz unit regarding frequency intervals for a case that steel is buried in a medium and for a case that plastic is buried in the medium, respectively.
  • the reflected wave of a solitary wave shows a very high peak value at around 725 Hz when plastic is buried in the medium 190
  • the reflected wave of a solitary wave shows a very high peak value at around 780 Hz when steel is buried in the medium 190.
  • the SCM sensor 165 includes a cantilever 310 which responds to external vibrations.
  • a SCM sensor having the cantilever 310 there is a MEMS sensor disclosed in US Patent No. 5,925,822 issued to Michael J. Naughton. The MEMS sensor disclosed in US Patent No. 5,925,822 is incorporated by reference herein. The detailed description of a specific structure and its functions of the SCM sensor 165 is disclosed in US Patent No.
  • Fig. 5 is a graph showing frequency characteristics in a reflected wave in accordance with the present invention. More specifically, Fig. 5 shows a frequency characteristic (dot line graph) of a reflected wave of a solitary wave obtained from sand which is filled in a box with a dimension of 1.5mx1.5mx1.5m and a frequency characteristic (solid line graph) of a reflected wave of a solitary wave obtained from a plastic mine made of FRP (Fiberglass-Reinforced Plastic) material which is buried with a depth of 10cm from the sand surface, respectively.
  • FRP Feberglass-Reinforced Plastic
  • a high level of the reflected wave shown in a low frequency range below 300Hz is an effect due to a wall of the sand box, which resulted from an experimental condition in a laboratory.
  • the level of a reflected wave is expected to be very low in a low frequency range if a search is made to detect a buried object in a wide area.
  • the result shows that the frequency-based characteristics of a reflected wave of a solitary wave for a plastic mine is quite different.
  • the standard data value of a medium is initialized by building a database after measuring a reflected wave of a solitary wave under the same medium environment where a buried object does not exist and checking a wave form of the reflected wave.
  • different peak frequencies of a reflected wave signal of a solitary wave detected by the first acoustic sensor 160 and the second acoustic sensor 165 for a same buried object in a medium may be obtained. This result comes from different characteristics between a GMI sensor and an SCM sensor which are used for the first acoustic sensor 160 and the second acoustic sensor 165, respectively.
  • Fig. 6 is a perspective view of a detector 600 for detecting a buried object in accordance with an embodiment of the present invention. As illustrated in Fig.
  • the detector 600 for detecting a buried object in accordance with an embodiment of the present invention comprises a lower body 610 for mounting the first acoustic sensor 160, the second acoustic sensor 165, and the acoustic source 130 shown in Fig. 1 ; a connection bar 620 extending from the lower body 610; a fixing device 630 mounted to the connection bar 620 for fixing a part of a user's body such as arm, etc.; and a display device 105 installed to a part of the connection bar 620.
  • the display device illustrated in Fig. 6 is to display the existence or not of an unknown buried object, in accordance with a determination result by the control unit 100 shown in Fig.
  • the display device 105 may include a lighting lamp.
  • the display device 105 may include a display panel 640 for visually displaying the measured result obtained from the first acoustic sensor 160 and the second acoustic sensor 165 using, for example, graphics.
  • the display panel 64 may be embodied by a flat panel display device such as, for example, an LCD panel, etc.
  • Fig. 7 is a view of a lower body 610 of a detector 600 for detecting a buried object seen from "A" direction as illustrated in Fig. 6. That is, Fig.
  • FIG. 7 shows an arrangement relationship on how the acoustic source 130, the first acoustic sensor 160 and the second acoustic sensor 165 used for the detector 600 are arranged in the lower body 610. More specifically, in the detector 600 of the present invention depicted in Fig. 7, the acoustic source 130 is placed in the center of the lower body 610, while the first acoustic sensor 160 and the second acoustic sensor 165 are placed alternately along the circumference of the lower body 610. Thus, the first acoustic sensor 160 and the second acoustic sensor 165 respectively receive a reflected wave of a solitary wave emitted from the acoustic source 130 with same conditions.
  • Fig. 8 is a flow chart showing a method for detecting a buried object using solitary waves in accordance with an embodiment of the present invention.
  • ECU 110 drives the function generator 140 for senor and transmits the driving signal described above to the first acoustic sensor 160 and the second acoustic sensor 165, and the first lock- in amplifier 170 (S810). Therefore, the first acoustic sensor 160 and the second acoustic sensor 165 are in a waiting state for detecting a reflected wave of a solitary wave.
  • the first lock-in amplifier 170 is in a waiting state for comparing the generated signal with the driving signal and transmitting a detection signal equivalent to a deviation therebetween to the second lock-in amplifier 150.
  • ECU 110 sets up a specific frequency and transmits a solitary wave generation signal corresponding to the specific frequency to the function generator 120 for acoustic source (S815).
  • the function generator 120 for acoustic source generates a solitary wave signal corresponding to the specific frequency which is transmitted to the amplifier 125 (S820).
  • the amplifier 125 transmits a reference signal which is an amplified signal of the received solitary wave signal to the acoustic source 130 (S822), and the acoustic source 130 emits a solitary wave signal toward a medium (S825).
  • the reference signal of the solitary wave outputted from the amplifier 125 is inputted into the second lock-in amplifier 150 (S827).
  • the solitary wave emitted from the acoustic source 130 is reflected from a buried object 195 in the medium 190 (S830). Then, the reflected wave is detected by the first acoustic sensor 160 and the second acoustic sensor 165.
  • the first acoustic sensor 160 generates a first reflected wave signal corresponding to the reflected wave of the solitary wave (S835) and the second acoustic sensor 165 generates a second reflected wave signal corresponding to the reflected wave of the solitary wave (S837). Then, the generated first and second reflected wave signals are inputted into the first lock-in amplifier 170 (S840). Thereafter, the first and the second reflected wave signals are modulated by the first lock-in amplifier 170 and then transmitted to the second lock-in amplifier 150.
  • the first lock-in amplifier 170 calculates a deviation (i.e., a modulated first reflected wave signal) between the first reflected wave signal and a driving signal from the function generator 140 for sensor (S845) and simultaneously calculates a deviation (i.e., a modulated second reflected wave signal) between the second reflected wave signal and a driving signal from the function generator 140 for sensor (S847). Then, the second lock-in amplifier 150 extracts, from the first and the second reflected wave signals, frequency components (i.e., reflection intensities of the reflected wave relating to the specific frequency described above) corresponding to the reference signal inputted from the amplifier 125 and transmits the frequency components to ECU 110 (S850).
  • a deviation i.e., a modulated first reflected wave signal
  • a driving signal from the function generator 140 for sensor S845
  • a deviation i.e., a modulated second reflected wave signal
  • the second lock-in amplifier 150 extracts, from the first and the second reflected wave signals,
  • ECU 110 receives the frequency components by the first acoustic sensor 160 and the frequency components by the second acoustic sensor 165 of the reflected waves from the medium 190 and the buried object 195 for the specific frequency used for driving the function generator 120 for acoustic source (S855).
  • ECU 110 performs repeatedly the steps (S815-S855) for detecting the reflection intensities of reflected waves relating to a variety of specific frequency by varying the specific frequency. As an example, it is possible to detect the reflection intensities of reflected waves for various specific frequencies with a unit interval of 10Hz over a frequency range of 10Hz ⁇ 10KHz.
  • the unit interval between specific frequencies may be adjusted to be a narrower range (e.g., 5Hz) or to be a wider range (e.g., 20Hz) on a necessity basis. More specifically, ECU 110 which completed the steps (S815-S855) for detecting the reflection intensities of a reflected wave relating to one specific frequency determines whether further steps for detecting the reflection intensities of reflected waves relating to all specific frequencies having a unit interval of 10Hz over the frequency range of 10Hz ⁇ 10KHz (S860). If the determination in step S860 is "No," then the method for detecting a buried object of the present invention proceeds to step S815.
  • ECU 110 calculates a first characteristic frequency for the first reflected wave signal (S862) and calculates a second characteristic frequency for the second reflected wave signal (S864).
  • the first and the second characteristic frequencies are calculated as peak frequencies for the first and the second reflected wave signals.
  • ECU 110 determines whether both the first and the second characteristic frequencies exist in a first predetermined frequency range and a second predetermined frequency range (S870). That is, ECU 110 determines whether both the first predetermined frequency range covering the first characteristic frequency and the second predetermined frequency range covering the second characteristic frequency exist among a plurality of frequency ranges.
  • the first predetermined frequency range covering the first characteristic frequency should be identical to the second predetermined frequency range covering the second characteristic frequency.
  • the first characteristic frequency and the second characteristic frequency may vary depending on the characteristics of sensors to be used as described above. If it turns out that both the first and the second predetermined frequency ranges exists in step S870, ECU 110 warns that a buried object exists by lighting a lighting lamp included in the display device 105 (S875).
  • ECU 110 determines the type of the buried object corresponding to both the first and the second predetermined frequency ranges (S880). That is, ECU 110 retrieves the type of the buried object, corresponding to both the first and the second predetermined frequency ranges, which is pre-stored in the memory 115. Once the type of the buried object is determined, ECU 110 displays the determined type on the display device 105 (S885). Thus, it is displayed that a predetermined substance corresponding to both the first predetermined frequency range for the first acoustic sensor and the second predetermined frequency range for the second acoustic sensor is buried in the medium.
  • step S870 proceeds to the initial step and performs detection processes continuously for the unknown buried object.
  • the apparatus and the method for detecting a buried object of the present invention can detect the existence of a buried object and the type thereof reliably and exactly and the apparatus for detecting a buried object can be made in a compact size by using with compact sized sensors having high performance.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

L'invention concerne un appareil conçu pour détecter un objet enterré au moyen d'ondes solitaires comprenant une source acoustique qui émet une onde solitaire; au moins un premier capteur acoustique qui génère un premier signal d'onde réfléchie correspondant à une onde réfléchie de l'onde solitaire émise de la source acoustique; au moins un second capteur acoustique qui génère un second signal d'onde réfléchie correspondant à une onde réfléchie de l'onde solitaire émise de la source acoustique; et une unité de commande qui entraîne la source acoustique pour émettre l'onde solitaire en direction d'un milieu censé renfermé l'objet enterré, qui reçoit les premier et second signaux des premier et second capteurs acoustiques, respectivement, et qui détermine l'existence de l'objet enterré dans ledit milieu sur la base des premier et second signaux d'ondes réfléchies.
PCT/KR2005/000661 2004-03-10 2005-03-09 Appareil et procede de detection d'un objet enterre au moyen d'une onde solitaire WO2005085902A1 (fr)

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JP2007502714A JP2007528498A (ja) 2004-03-10 2005-03-09 孤立波を利用して埋設物を探知する装置及び方法

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KR1020040016150A KR100671266B1 (ko) 2004-03-10 2004-03-10 솔리톤 웨이브를 이용한 매설물 탐지 장치 및 방법

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* Cited by examiner, † Cited by third party
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WO2009099469A1 (fr) 2008-02-07 2009-08-13 California Institute Of Technology Procédé et appareil pour une évaluation non destructive et un contrôle non destructif de matériaux et de structures
US9080088B2 (en) 2008-02-07 2015-07-14 California Institute Of Technology Granular crystal
US20200116881A1 (en) * 2018-10-12 2020-04-16 Massachusetts Institute Of Technology Heterogeneous subsurface imaging systems and methods
US11841265B2 (en) 2018-10-12 2023-12-12 The Trustees Of Boston University Heterogeneous subsurface imaging systems and methods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101310215B1 (ko) * 2009-12-21 2013-09-24 한국전자통신연구원 착용형 지하 매설물 탐지 장치 및 방법

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03257980A (ja) * 1990-03-08 1991-11-18 Matsushita Electric Ind Co Ltd レーザ装置
US5819859A (en) * 1996-01-11 1998-10-13 Vermeer Manufacturing Company Apparatus and method for detecting an underground structure
WO1999010755A2 (fr) * 1997-08-28 1999-03-04 Northeastern University Detection acoustique de mines induite par impulsion optique
US5974881A (en) * 1997-07-16 1999-11-02 The Trustees Of The Stevens Institute Of Technology Method and apparatus for acoustic detection of mines and other buried man-made objects
US6415666B1 (en) * 1997-10-07 2002-07-09 Stevens Institute Of Technology Method and apparatus for acoustic detection of mines and other buried man-made objects
US6536553B1 (en) * 2000-04-25 2003-03-25 The United States Of America As Represented By The Secretary Of The Army Method and apparatus using acoustic sensor for sub-surface object detection and visualization

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03257980A (ja) * 1990-03-08 1991-11-18 Matsushita Electric Ind Co Ltd レーザ装置
US5819859A (en) * 1996-01-11 1998-10-13 Vermeer Manufacturing Company Apparatus and method for detecting an underground structure
US5974881A (en) * 1997-07-16 1999-11-02 The Trustees Of The Stevens Institute Of Technology Method and apparatus for acoustic detection of mines and other buried man-made objects
US6134966A (en) * 1997-07-16 2000-10-24 The Trustees Of The Stevens Institute Of Technology Method and apparatus for acoustic detection of mines and other buried man-made objects
WO1999010755A2 (fr) * 1997-08-28 1999-03-04 Northeastern University Detection acoustique de mines induite par impulsion optique
US6415666B1 (en) * 1997-10-07 2002-07-09 Stevens Institute Of Technology Method and apparatus for acoustic detection of mines and other buried man-made objects
US6536553B1 (en) * 2000-04-25 2003-03-25 The United States Of America As Represented By The Secretary Of The Army Method and apparatus using acoustic sensor for sub-surface object detection and visualization

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009099469A1 (fr) 2008-02-07 2009-08-13 California Institute Of Technology Procédé et appareil pour une évaluation non destructive et un contrôle non destructif de matériaux et de structures
EP2238442A1 (fr) * 2008-02-07 2010-10-13 California Institute of Technology Procédé et appareil pour une évaluation non destructive et un contrôle non destructif de matériaux et de structures
EP2238442A4 (fr) * 2008-02-07 2014-04-16 California Inst Of Techn Procédé et appareil pour une évaluation non destructive et un contrôle non destructif de matériaux et de structures
US9080088B2 (en) 2008-02-07 2015-07-14 California Institute Of Technology Granular crystal
US20200116881A1 (en) * 2018-10-12 2020-04-16 Massachusetts Institute Of Technology Heterogeneous subsurface imaging systems and methods
US11841265B2 (en) 2018-10-12 2023-12-12 The Trustees Of Boston University Heterogeneous subsurface imaging systems and methods
US11940580B2 (en) * 2018-10-12 2024-03-26 Massachusetts Institute Of Technology Heterogeneous subsurface imaging systems and methods

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