Liquid level sensor incorporating a capacitive rotary position e

Details Liquid level sensor incorporating a capacitive rotary position e Liquid level sensor incorporating a capacitive rotary position e

1997-12-04

1999-08-24

Oda, Christine K.

Measuring and testing

Liquid level or depth gauge

Float

73312, G01F 2330

Patent

active

059411228

ABSTRACT:
A circuit board has an arcuate array of conductor segments each subject to a digital waveform differing in phase for the various segments, and a concentric pickup conductor. A rotary encoder disk has a conductive pattern which sums and couples the waveforms from selected segments, depending on rotary position, to the pickup conductor. A synchronous phase detector generates a phase signal from the summed waveforms and the zero crossing of the phase signal is detected. A counter develops count signals used to generate the digital waveforms. The count signals are input to a latch which is clocked at the zero crossing point to latch the count value which is a digital measure of the encoder angle.

REFERENCES:
patent: 4160239 (1979-07-01), Adamson
patent: 4313114 (1982-01-01), Lee
patent: 4788546 (1988-11-01), Sasaki
patent: 4843387 (1989-06-01), Arai et al.
patent: 4879552 (1989-11-01), Arai et al.
patent: 5596188 (1997-01-01), McElroy

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