Abstract
A surface acoustic wave (SAW) sensor has been used to study water-vapor condensation and to measure the dew point. SAW sensor measurements of condensation density are compared with visual observations of condensation density. SAW theory predictions of surface density are in agreement with the experimental results. The minimum detectable surface density of the SAW sensor is shown to be more than two orders of magnitude smaller than that which can be detected by optical techniques. The high sensitivity of the SAW sensor suggests that it may be able to improve dew-point measurement accuracy by compensating for surface contamination. SAW sensor dew-point measurements are particularly sensitive to the surface density of the dew that is maintained on the sensor surface, the cleanliness of the sensor surface, and gas flowrates. Preliminary studies of hydrophilic and hydrophobic chemical treatments of the sensor surface also indicate an effect on dew-point measurements.
Published Version
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