Position sensor to compensate for change of temperature...

Details Position sensor to compensate for change of temperature... Position sensor to compensate for change of temperature...

2005-06-21

2005-06-21

Patidar, Jay (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

Reexamination Certificate

active

06909279

ABSTRACT:
A direct current and an alternate current are simultaneously supplied from a constant current circuit to a detection coil. At least one of the ratio of the direct current to the alternate current, the ratio of an alternate current component to a direct current component of an impedance in a detecting section, a temperature characteristic of the ratio of the direct current to the alternate current, and a temperature characteristic of the ratio of the alternate current component to the direct current component of the impedance of the detecting section is set in such a manner that the margin of fluctuation of a temperature coefficient of a peak value of an output voltage from the detecting section in a whole displacement zone of a core relative to the detection coil is smaller than the margin of fluctuation of a temperature coefficient of the alternate current component of the impedance of the detection coil at the frequency of the alternate current.

REFERENCES:
patent: 4864232 (1989-09-01), Redlich
patent: 5003258 (1991-03-01), Mancini
patent: 5107211 (1992-04-01), Rose
patent: 5115193 (1992-05-01), Bean et al.
patent: 5898300 (1999-04-01), Heizmann et al.
patent: 4-306890 (1992-10-01), None
patent: 9-33202 (1997-02-01), None
English Language Abstract of JP 9-33202, Feb. 7, 1997.

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