Industrial humidity sensor measures volume fraction of water in air via its effect on speed of sound. Only portion of sensor exposed to sensed atmosphere is pair of stainless-steel tubes, one containing dry air and other containing moist air. Counters measure intervals between reflected pulses. Sensor rugged enough for use in harsh environments like those used to control drying of paper in paper mills, where most humidity sensors do not survive.
Acoustic Humidity Sensor
NASA Tech Briefs ; 14 , 4
1990-04-01
Miscellaneous
No indication
English
SPIE | 1990
|NTRS | 1986
|European Patent Office | 2021
|Sensor for High-Air-Humidity Measurement
British Library Online Contents | 1996
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