Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1995-02-03
1996-05-14
Williams, Hezron E.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73 29020, G01N 19100
Patent
active
055157238
ABSTRACT:
A humidity sensor 1 has an impedance Zs thereof changed exponentially with respect to a relative humidity. A z-f conversion circuit 2 generates a pulse signal S1 corresponding to the impedance Zs. A time constant controlled differentiating circuit 3 has an impedance Zt of a voltage control variable impedance element 32 changed exponentially by a control voltage Vc, and outputs a differentiated signal S2 obtained by differentiating the pulse signal S1. A waveform shaping circuit 4 outputs a pulse signal train S3 obtained by binary-coding the differentiated signal S2. An integrating circuit 5 causes a first integrating circuit 51 to obtain the control voltage Vc by integrating the pulse signal train S3 and causes a second integrating circuit 52 to obtain a humidity signal S4 by integrating the pulse signal train S3. A bias circuit 6 applies a bias voltage to a control terminal 323 of the voltage control variable impedance element 32.
REFERENCES:
patent: 4330718 (1982-05-01), Kinomoto et al.
patent: 4386336 (1983-05-01), Kinomoto et al.
patent: 4801211 (1989-01-01), Yagi et al.
patent: 5065625 (1991-11-01), Nakagawa et al.
patent: 5317274 (1994-05-01), Nakagawa et al.
patent: 5396796 (1995-03-01), Kotani et al.
Nakagawa Shiro
Tsuchida Atsuko
Politzer Jay L.
TDK Corporation
Williams Hezron E.
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