Adhesion detector (single system / double system)

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  • There are micro-switch type and sensor type which eliminates mechanical contact and detects objects in a non-contact manner. Currently, proximity sensor type is used in domestic railway.
  • When a metal object approaches the center of a high frequency magnetic field combined with LC, an eddy current flows through the metal due to the electromagnetic induction phenomenon. This eddy current I and the intrinsic resistance R cause energy loss. As a result, the oscillation state can not be maintained due to the impedance change of the detection section oscillation coil, so that the oscillation stop or oscillation amplitude is reduced. The principle of generating an output signal by detecting the amount of change in oscillation energy of the oscillating portion is applied.
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