Acoustic wave H.sub.2 O phase-change sensor capable of self-cleaning and distinguishing air, water, dew, frost and ice
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United States of America Patent
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Sep 24, 1991
Grant Date -
N/A
app pub date -
Jan 30, 1990
filing date -
Jan 30, 1990
priority date (Note) -
Expired
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Abstract
A surface-acoustic-wave (SAW) H.sub.2 O phase-change sensor capable of distinguishing air, water, dew, frost and ice. The sensor can also distinguish various frost thicknesses. The sensor has a size allowing batch fabrication of the chips, and allowing the device to fit in small spaces such as between fins of an evaporator. The sensor is fabricated on a strong piezoelectric substrate with a short acoustic path length. The SAW phase-change sensor experiences large changes in insertion loss and impedance upon deposition of water in various phases. The sensor has a hydrophobic surface treatment covering the SAW sensor surface, and if placed in a vertical position will self-clean during a refrigeration defrost cycle.
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