Apparatus for and method of detecting a coded magnetic thread
作者： Barry Clifford Scowen , Peter Dilwyn Evans , John Alan Skinner , John Buttifant , Michael Potter
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摘要: A method of detecting a coded magnetic thread is provided that includes sensing the response field detector as passes detector, varying from an initial magnitude in first and second senses to exhibit peak, then sense peak; comparing with thresholds disposed about respectively; indicating passage code element when threshold predetermined manner characterized adjusted accordance algorithm based on peak. The adjusts so average number preceding peaks.
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