Constant temperature hygrometer
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United States of America Patent
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-
Dec 27, 1988
Grant Date -
N/A
app pub date -
Jun 2, 1987
filing date -
Jun 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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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