Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1985-06-20
1987-05-05
Levy, Stewart J.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
324 61R, G01W 100
Patent
active
046622209
ABSTRACT:
A method and apparatus using a known water-absorbent polymer as a capacitor which is operated at a DC voltage for measuring relative humidity. When formed as a layer between porous electrically-conductive electrodes and operated in an RC oscillator circuit, the oscillator frequency varies inversely with the partial pressure of the moisture to be measured. In a preferred embodiment, the capacitor is formed form Nafion and is operated at a low DC voltage with a resistor as an RC circuit in an RC oscillator. At the low voltage, the leakage current is proper for oscillation over a satisfactory range. The frequency of oscillation varies in an essentially linear fashion with relative humidity which is represented by the moisture being absorbed into the Nafion. The oscillation frequency is detected by a frequency detector.
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R. Samuel et al., Electronic Humidity Measuring System, Patent Associated Literature, 4-1976.
Jones Thomas H.
Levy Stewart J.
Manning John R.
McCaul Paul F.
The United States of America as represented by the Administrator
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