Inductance-change detection apparatus

Details Inductance-change detection apparatus Inductance-change detection apparatus

1997-10-14

1999-03-30

Ballato, Josie

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324656, 361188, 361159, G01R 2728

Patent

active

058894063

ABSTRACT:
The inductance-change detection apparatus comprises an inductance-change converter that converts inductance-change in coils into voltage to output, a reference-voltage generator that generates and outputs a predetermined reference voltage, a frequency characteristic adder that adds a frequency characteristic similar to that of the converted voltage converted by the inductance-change converter to the reference voltage, a reference-voltage compensator that varies and compensates the frequency spectrum of the reference voltage containing the added frequency characteristic, in parallel in the direction of amplitude, corresponding to a parallel variation of the frequency spectrum of the converted voltage in the direction of amplitude, and an inductance-change detector that compares the converted voltage with the compensated reference voltage to detect inductance changes in the coils.

REFERENCES:
patent: 5295038 (1994-03-01), Matsushita et al.
patent: 5608318 (1997-03-01), Yasui

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