作者: Alain Stankoff
DOI:
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摘要: A metal pipeline detector is described in which a generator generates magnetic field. The field couples the when located vicinity thereof, and as result eddy currents are induced pipeline. Detector coils arranged to be coupled by produced but not generated generator. spaced apart so that magnitude of each coil representative distance between coil. Electrical processing circuitry acts detect difference determine degree displaced from optimum path for tracking In addition means response outputs provide an indication detector.