Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1990-05-02
1991-11-19
Noland, Tom
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73 2902, 73 2905, G01W 100
Patent
active
050656252
ABSTRACT:
A humidity meter includes a humidity-frequency converter which is essentially a pulse oscillator, the frequency of which depends upon the impedance of a humidity sensor, a pulse width modulator for adjusting pulse width of an output pulse of the converter for assuring a linear relationship between humidity and the output signal, and an integrator for integrating the output of the pulse width modulator to provide an output signal as a DC level. A feedback path is provided to apply the output signal to the pulse width modulator for assuring a linear output irrespective of the exponential characteristics of the humidity sensor.
REFERENCES:
patent: 4326414 (1982-04-01), Terada et al.
patent: 4373392 (1983-02-01), Hagamoto
patent: 4646066 (1987-02-01), Baughman et al.
patent: 4649736 (1987-03-01), Austin
patent: 4816748 (1989-03-01), Tazawa et al.
Domon Taisuke
Imai Takehiro
Nakagawa Shiro
Tsuchida Atsuko
Francos W.
Noland Tom
Novack Martin M.
TDK Corporation
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