Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1995-02-09
1996-07-02
Williams, Hezron E.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73 2901, 7333502, 7333503, 324667, 324677, G01W 100, G01N 2712
Patent
active
055310974
ABSTRACT:
An absolute humidity meter in which a humidity sensor changes an electrical impedance thereof-exponentially with respect to the relative humidity. A z-f converting circuit (impedance to frequency ) generates a pulse signal corresponding to the impedance. A time constant control differentiating circuit has an impedance of a voltage control variable impedance element changed exponentially by a control voltage, and outputs a differentiated signal obtained by differentiating the pulse signal. A waveform shaping circuit outputs a pulse signal train obtained by binary-valued the differentiated signal. An integrating circuit causes a first integrating circuit to obtain the control voltage by integrating the pulse signal train and a second integrating circuit to obtain an output voltage of a relative humidity signal by integrating the pulse signal train, and obtains an absolute humidity signal by causing at least one of these integrating circuit to control the control voltage or the output voltage with increasing temperature.
REFERENCES:
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patent: 3831450 (1974-08-01), Schipke et al.
patent: 4379406 (1983-04-01), Bennewitz et al.
patent: 4793182 (1988-12-01), Djorup
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
TDK Corporation
Wiggins J. David
Williams Hezron E.
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