Humidity sensing apparatus

Details Humidity sensing apparatus Humidity sensing apparatus

1993-02-22

1994-09-06

Williams, Hezron E.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01N 2556

Patent

active

053437462

ABSTRACT:
A humidity sensing apparatus is operated by an AC power supply. The humidity sensing apparatus comprises a humidity sensing section including a humidity sensor and a divider resistor connected in parallel to the humidity sensor; a humidity sensor operating section for supplying the humidity sensor with an AC voltage within predetermined voltage levels; and, a humidity signal converting section including diodes, condensers and resistors. The humidity signal converting section converts the AC humidity signal output from the humidity sensing section into a corresponding DC humidity signal by selecting the time constants of the pair of condenser-resistor circuits and then supplies the peripheral digital circuits with the converted signals.

REFERENCES:
patent: 3196682 (1965-07-01), Johnson, Jr.
patent: 4335293 (1982-06-01), Kobayashi et al.
patent: 4546916 (1985-10-01), Tsuaki
patent: 4768378 (1988-09-01), Ando et al.
patent: 5040417 (1991-08-01), Rowlette

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