Measuring device of buried position of underground cable


PURPOSE:To search buried position of an underground cable with high accuracy removing the disturbance caused by buried metallic body around here by measuring the ground surface magnetic field with plurality of search coils attached to a frame having a matrix construction. CONSTITUTION:A frame 2 is set straddling a cable buried position so that it may be approximiately right angle to the buried direction thereof. Then, the frame 2 is moved horizontally and fixed initially at a point where magnetic field intensity signals of searh coils 3a, 3b, and 3c mounted horizontally to the frame. Then, detecting signals of search coils 4a-21a designed at arbitrary angles are selected by a scanning part 27, amplified selectively in order, input to a coil rotation cotrolling part 30 and control the angle of the coil so that an induced voltage of the search coil may be min. This angle shows a direction of the magnetic field in this point and an output of each of search coils 4b-21b perpendicular to this shows a magnetic intensity. The buried position of the cable can be confirmed by the selection of the output of efficacious coil group having a fluxity even if there exists another buried material in its neighbourhood.




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Cited By (8)

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    JP-H0820524-B2March 04, 1996日本電気株式会社, 東京瓦斯株式会社海底埋設導体の検知器からの埋設深さ測定装置
    JP-S59162474-ASeptember 13, 1984Ian Houeru MaakuElectromagnetic surveying device for conductor
    JP-S59183387-AOctober 18, 1984Nec CorpSystem for measuring laid depth of submarine conductor
    JP-S629286-AJanuary 17, 1987Tokyo Gas Co LtdMethod and device for detecting underground installation
    JP-S6335978-UMarch 08, 1988
    JP-S6355448-AMarch 09, 1988Nec Corp, Tokyo Gas Co LtdMethod and device for deciding deterioration of covering of buried object
    JP-S64481-AJanuary 05, 1989Nkk CorpDetection of damage of coated film
    US-4691165-ASeptember 01, 1987Laszlo SzedlmajerMethod and apparatus including spaced antennas for determining the trace and depth of underground metallic conductors