Detector for detecting foreign matter in object by using discriminant electromagnetic parameters
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United States of America Patent
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Sep 3, 1991
Issued Date -
N/A
app pub date -
Jul 26, 1989
filing date -
Jul 26, 1988
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Expired
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Abstract
A foreign matter detector includes an oscillator for generating an oscillating signal, a phase shifter connected to the oscillator and adapted to provide a phase shifted oscillating signal, and an electromagnetic transducer. The transducer includes an excitation coil connected to the oscillator and two interconnected detection coils magnetically coupled to the excitation coil and adapted to produce a differential signal therebetween when an object is passed through the transducer. The detector also includes a first detector adapted to produce a first detected analog signal corresponding to the component of the differential signal in phase with the oscillating signal and a second detector adapted to produce a second detected analog signal corresponding to the component of the differential signal in phase with the phase shifted oscillating signal. The detector further includes an analog to digital converter connected to the first and second detectors adapted for converting the first and second analog detected signals into first and second series of digital values, respectively, and circuitry connected to the converter for selecting a representative value for the object from each of the first and second series of the digital values.
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