Displacement sensing circuit with coil and band pass filter for

Details Displacement sensing circuit with coil and band pass filter for Displacement sensing circuit with coil and band pass filter for

1990-12-26

1992-04-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420716, 32420725, 32420726, 328167, G01B 714

Patent

active

051072106

ABSTRACT:
A displacement sensing circuit for sensing a displacement of a measured object without any contact with the measured object. A detecting coil is disposed relative to the measured object to be capable of changing its inductance in response to a displacement of the measured object from a predetermined position. An output signal from the detecting coil is passed through a band-pass filter. The filter has a frequency band width which is equal to at least twice the upper limit of a response frequency of the sensing circuit, thereby outputting a signal less influenced by a noise. An output from the band-pass filter is detected to provide a signal corresponding to the displacement of the measured object.

REFERENCES:
patent: 3488581 (1970-01-01), Foster
patent: 3715659 (1973-02-01), Abnett et al.
patent: 4321602 (1982-03-01), Kipp
patent: 4654589 (1987-03-01), Whetham et al.
patent: 4678992 (1987-07-01), Hametta
patent: 4856098 (1989-08-01), Morra

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