Surface Acoustic Wave Microhygrometer

Paper #:
  • 972393

Published:
  • 1997-07-01
Citation:
Hoenk, M., Cardell, G., Price, D., Watson, R. et al., "Surface Acoustic Wave Microhygrometer," SAE Technical Paper 972393, 1997, https://doi.org/10.4271/972393.
Pages:
8
Abstract:
A microhygrometer has been developed at JPL's Microdevices Laboratory based on the principle of dewpoint/frostpoint detection. The surface acoustic wave device used in this instrument is approximately two orders of magnitude more sensitive to condensation than the optical sensor used in chilled-mirror hygrometers. In tests in the laboratory and on the NASA DC8, the SAW hygrometer has demonstrated more than an order of magnitude faster response than commercial chilled-mirror hygrometers, while showing comparable accuracy under steady-state conditions. Current development efforts are directed toward miniaturization and optimization of the microhygrometer electronics for flight validation experiments on a small radiosonde balloon.
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