Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-01-30
1991-09-24
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313R, 73579, H01L 4108
Patent
active
050516450
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.
REFERENCES:
patent: 3465535 (1969-09-01), Dodge, III
patent: 3641781 (1972-02-01), Nijo
patent: 3689907 (1972-09-01), Guajardo
patent: 3995240 (1976-11-01), Kerbel
patent: 4037427 (1977-07-01), Kramer
patent: 4102207 (1978-07-01), Frost et al.
patent: 4121433 (1978-10-01), Pomerantz
patent: 4126047 (1978-11-01), Sethares et al.
patent: 4176524 (1979-12-01), Kamiyama et al.
patent: 4206612 (1980-06-01), Gardner
patent: 4270105 (1981-05-01), Parker et al.
patent: 4312228 (1982-01-01), Wohltjen
patent: 4342971 (1982-08-01), Councilman et al.
patent: 4347709 (1982-09-01), Wu et al.
patent: 4348869 (1982-09-01), Massa
patent: 4404852 (1983-09-01), Goto
patent: 4530218 (1985-07-01), Janke et al.
patent: 4532806 (1985-08-01), Bruchmuller
patent: 4568922 (1986-02-01), Schwippert et al.
patent: 4604612 (1986-08-01), Watkins et al.
patent: 4661738 (1987-04-01), Skeie
patent: 4681855 (1987-07-01), Huang
patent: 4818961 (1989-04-01), Takahashi et al.
patent: 4878036 (1989-10-01), Yatsuda et al.
patent: 4891628 (1990-01-01), Zuckerman
patent: 4960329 (1990-10-01), Schofield
Hughes et al., "Liquid-Solid Phase Transition Detection with Acoustic Plate Mode Sensors: Application to Icing of Surfaces", Sensors and Actuators, A21-A23 (1990) pp. 693-699.
Hafeez, et al., "Ice Dectection using Surface Acoustic Waves", Acta Polytechnica Scandinavica, Applied Physics Series No. 118, Helsinki 1977, pp. 3-10.
Clark, "Water Frost and Ice: The Near-Infrared Spectral Reflectance 0.65-2.5 .mu.m", Journal of Geophysical Research, vol. 86, No. B4, Apr. 10, 1981, pp. 3087-3096.
Deom, et al., "Detection and Measurement of Ice Accretion on a Profile by an Ultrasonic Method", AlAA 25th Aerospace Sciences Meeting, AlAA-87-0179, Reno, Nev., Jan. 1, 1987, pp. 1-5.
Garnier, et al., "Capteur Ultrasonore pour la Detection et la Mesure d'Epaisseur de Givre sur un Profil", 2eme Colloque International sur la Securite Aerienne, Toulouse, Nov. 1986, pp. 1-10.
Brace John G.
Sanfelippo Thomas S.
Budd Mark O.
Dougherty Thomas M.
Johnson Service Company
LandOfFree
Acoustic wave H.sub.2 O phase-change sensor capable of self-clea does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Acoustic wave H.sub.2 O phase-change sensor capable of self-clea, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic wave H.sub.2 O phase-change sensor capable of self-clea will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1698935