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    • 6. 发明专利
    • UNDERGROUND OBJECT SEARCHING METHOD
    • JPH07270544A
    • 1995-10-20
    • JP8275494
    • 1994-03-30
    • NIPPON TELEGRAPH & TELEPHONE
    • SAITO HIROTONAGASHIMA YUJIKOBAYASHI SHIGERUMASUDA JUNICHI
    • G01B15/00G01S13/88G01V3/12
    • PURPOSE:To prevent erroneous recognition due to the effect of reflected wave by notifying a person in charge that the sum of data map of propagation time and moving distance of a difference data obtained from a signal received after movement of a predetermined distance and a signal received at a position separated by a predetermined distance therefrom exceeds a prescribed value. CONSTITUTION:A difference data is obtained from the differential waveform of amplitude for the same propagation time based on a waveform signal picked up every time when a searcher further moves a predetermined distance after moving a predetermined distance from a start point and a waveform picked up at a position separated by a predetermined distance therefrom. The maximal in the positive direction, maximal in the negative direction and the remaining values of the difference data are then standardized, respectively, to '1', '-1' and '0', thus obtaining a two-dimensional data map having the moving distance and the propagation time as the axes. It is decided that an object is embedded when the sum of difference of moving distance and propagation time obtained from the difference between the first normalization results, i.e., the reference coordinates of '1' and '-1', and next standardization results, i.e., related coordinates of line data, exceeds a prescribed value.
    • 8. 发明专利
    • METAL BURIED OBJECT DETECTING SENSOR ASSEMBLY DEVICE
    • JPH06308253A
    • 1994-11-04
    • JP10245593
    • 1993-04-28
    • NIPPON TELEGRAPH & TELEPHONE
    • HAGIWARA YUTAKANISHIMURA TSUTOMUSATO MASASHIMASUDA JUNICHI
    • E02F9/26G01V3/08G01V3/10
    • PURPOSE:To extend the detection limit distance and facilitate construction by fitting a required number of detecting sensors each constituted of a resonance circuit or a hole element around a spacer side, and allowing them to freely scan via the rotary spacer. CONSTITUTION:Detecting sensors 15a-15l are fitted to angular faces of a 12-side angular face-shaped spacer 14 screwed 13 to the tip section of an underground excavating machine to form a detecting sensor assembly beta', and it is horizontally stored with its front face directed to the tip. The sensors 15a-15l are LCR resonance circuits having the same resonance frequency as the output frequency of a ground transmission AC power source. When an AC current is fed from the ground transmission AC power source to electrodes buried near the excavation start point and the completion point, if a metal buried object having very small inherent electrical resistivity as compared with the electrical resistivity of the ground exists, the current flows in the metal buried object, and the alternating magnetic field is generated around it. When the magnetic lines of force of the alternating magnetic field are extracted by the LCR resonance circuits of the sensors 15a-15l by resonance, the existence of the metal buried object can be detected.
    • 9. 发明专利
    • METHOD FOR DETECTING BURIED OBJECT
    • JPH06258428A
    • 1994-09-16
    • JP6593993
    • 1993-03-03
    • NIPPON TELEGRAPH & TELEPHONE
    • NAGASHIMA YUJIARIOKA RYOSUKEKOBAYASHI SHIGERUMASUDA JUNICHI
    • G01S13/88G01V3/12G08B3/10
    • PURPOSE:To enable the detection of a buried object by receiving a reflected wave every specified period and differenciating the amplitude value of the received signal to examine the relevancy between successively received two signals. CONSTITUTION:A pulse signal which is sent to a sending antenna 2 prepared on an earth surface 20 is converted into an electromagnetic wave to be radiated in the earth and is reflected on a buried pipe 30. The reflected electromagnetic wave is received by an receiving antenna 3 based on the timing of the signal sent from a time counter 5 and is converted into an electric signal by a receiver 4. In the time position where the differentiated value of the received signal becomes zero, if the amplitude sign of the original received signal at the time position shows plus, the amplitude value is standardized as '1' and if it shows minus, the amplitude value as '-1', respectively, and further the amplitude values at the time position other than the above are standardized as '0.' Then a data map in which the standardized result on successively received two signals is described is prepared. Therefore, the position of the buried pipe 30 can be detected by examining the relevancy between the standardized value and the respective coordinates of line data.