Capacitive humidity sensor

Details Capacitive humidity sensor Capacitive humidity sensor

2006-04-25

2006-04-25

Williams, Hezron (Department: 2856)

Measuring and testing

Gas analysis

Moisture content or vapor pressure

C073S029010, C073S029050, C073S335020, C361S280000, C361S281000, C361S286000

Reexamination Certificate

active

07032448

ABSTRACT:
A capacitive humidity sensor includes a detection portion and a reference portion. The detection portion includes detection electrodes and a moisture sensitive film. The reference portion includes reference electrodes and a moisture permeation film as a capacitance adjusting film. The capacitive humidity sensor detects humidity by converting a capacitance difference between a capacitance of the detection electrodes and a capacitance of the reference electrodes to an electric signal by using a capacitance-voltage conversion circuit. The moisture permeation film reduces offset voltage of the capacitive humidity sensor. Thus, an offset compensation circuit or the like is not required.

REFERENCES:
patent: 3891958 (1975-06-01), Wakabayashi
patent: 4393434 (1983-07-01), Imai et al.
patent: 4419888 (1983-12-01), Kitamura et al.
patent: 4473813 (1984-09-01), Kinjo et al.
patent: 4603372 (1986-07-01), Abadie et al.
patent: 5004700 (1991-04-01), Webb et al.
patent: 5036704 (1991-08-01), Pusatcioglu et al.
patent: 5050434 (1991-09-01), Demisch
patent: 5254371 (1993-10-01), Hegner et al.
patent: 5741540 (1998-04-01), Li et al.
patent: 5767687 (1998-06-01), Geist
patent: 5837884 (1998-11-01), Kimura et al.
patent: 5855849 (1999-01-01), Li et al.
patent: 6229318 (2001-05-01), Suda
patent: 6342295 (2002-01-01), Kobayashi
patent: 6445565 (2002-09-01), Toyoda et al.
patent: 6580600 (2003-06-01), Toyoda et al.
patent: 6615659 (2003-09-01), Shibue et al.
patent: 6840103 (2005-01-01), Lee et al.
patent: 2001/0015089 (2001-08-01), Kleinhans et al.
patent: 2003/0002238 (2003-01-01), Toyoda
patent: 2003/0010119 (2003-01-01), Toyoda
patent: 2194845 (1988-03-01), None
patent: WO 9103734 (1991-03-01), None
patent: WO 200142775 (2001-06-01), None

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