Displacement sensor having a phase variation of an impedance

Details Displacement sensor having a phase variation of an impedance Displacement sensor having a phase variation of an impedance

2007-12-04

2007-12-04

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S2140RC

Reexamination Certificate

active

11188602

ABSTRACT:
A displacement sensor comprising: a detecting portion including a coil arranged in such manner that a relative position to a magnetic response substance varies in correspondence to a displacement of an object to be measured; an oscillating circuit to supply an alternating-current signal with a prescribed frequency to the detecting portion; an externally attached circuit connected to the detecting portion; and a displacement detecting means to detect the displacement of the object to be measured based on an amount of phase variation of an impedance in the detecting portion and the externally attached circuit, wherein parameters of the externally attached circuit are set in such manner that the amount of the phase variation by the displacement becomes larger than the amount of the phase variation by temperature variation.

REFERENCES:
patent: 4006637 (1977-02-01), Kinosita
patent: 2000-292201 (2000-10-01), None

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