Title :
A comparison of SAW and optical dew point measurement techniques
Author :
Vetelino, Kevin A. ; Story, Patrick R. ; Galipeau, D.W.
Author_Institution :
Dept. of Electr. Eng., South Dakota State Univ., Brookings, SD, USA
Abstract :
A comparison of SAW and optical dew point measurement techniques in the areas of condensation sensitivity, surface contamination effects, frost point transition behavior, and dew point measurement resolution was made using a novel hybrid SAW/optical sensor. In addition SAW frequency was used to compare SAW dew point measurements to a commercial optical sensor. The SAW dew point sensor was found to be much less susceptible than the optical technique to surface contamination. The frost point transition was found to cause significant instability to the dew point measurements when controlling condensation density with SAW velocity, or optical reflection voltage. SAW amplitude provided continuous dew point measurements. A SAW oscillator dew point system had a measurement resolution of 0.03°C as compared to a resolution of 0.2°C for a commercial optical dew point hygrometer
Keywords :
humidity sensors; optical sensors; surface acoustic wave sensors; surface contamination; SAW oscillator; condensation sensitivity; dew point measurement; frost point transition; hybrid SAW/optical sensor; optical hygrometer; resolution; surface contamination; water vapor; Area measurement; Density measurement; Frequency measurement; Measurement techniques; Optical sensors; Pollution measurement; Surface acoustic waves; Surface contamination; Velocity control; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495638
