Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1987-06-02
1988-12-27
Levy, Stewart J.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73 29, G01W 100
Patent
active
047931825
ABSTRACT:
A constant temperature hygrometer comprising a piezoelectric substrate supporting a temperature coefficient resistor on one face and a conducting electrode on the opposite face, one or both conductor faces partially or completely covered by a hygroscopic layer of aluminum oxide anodized from aluminum metal deposited on one or both conductor faces, operated by a feedback controlled constant temperature bridge circuit, excited and read out by radio frequency oscillator circuitry; together with alternate forms of hygrometer transducer structures and water vapor sorptive materials.
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Levy Stewart J.
Roskos Joseph W.
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