Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-03-13
1994-06-14
Williams, Hezron E.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
73 2401, 73 2406, 73 6453, 73 6179, 310313B, H01L 4108
Patent
active
053213319
ABSTRACT:
A fluid sensing device such as a Surface Transverse Wave device or a Love Wave device having controlled transfers of energy from a transduction surface of a piezoelectric substrate to a sensing surface and back to the transduction surface. A first wave-trapping structure adjacent to an input transducer tapers to provide a controlled diffraction of shear transverse wave energy to a second wave-trapping structure disposed on an opposite side of the piezoelectric substrate. The second wave-trapping structure interfaces with the fluid under test. The shear transverse waves are then recaptured by a third wave-trapping structure on the same surface as the first wave-trapping structure. The wave energy is then decoupled from the piezoelectric substrate. In the STW device, the wave-trapping structures are periodic fingers that are selectively varied in thickness or width or both. In the LW device, the wave-trapping structures are plates that each vary in thickness.
REFERENCES:
patent: 4361026 (1982-11-01), Muller et al.
patent: 4636678 (1987-01-01), Ballato
patent: 4814658 (1989-03-01), Suthers et al.
patent: 4837476 (1989-06-01), Mochizuki
patent: 4918349 (1990-04-01), Shiba et al.
patent: 4965479 (1990-10-01), Elliott et al.
patent: 5076094 (1991-12-01), Frye et al.
patent: 5111168 (1992-05-01), Panasik et al.
patent: 5117146 (1992-05-01), Martin et al.
patent: 5187980 (1993-02-01), Blair et al.
patent: 5220234 (1993-06-01), Flory et al.
Wenzel et al., "Flexural Plate-wave Gravimetric Chemical Sensor," Sensors and Actuators, A21-A23 (1990), pp. 700-703.
Martin et al., "Characterization of SH Acoustic Plate Mode Liquid Sensors," Sensors and Actuators, 20 (1989), pp. 253-268.
D. F. Thompson, "Temperature Compensation of Microwave Acoustic Resonators," doctoral dissertation for Stanford University, Jun. 1986, Chapter III.
C. Caliendo et al. "K+ detection using shear horizontal acoustic modes", IEEE 1990 Ultrasonics Symposium vol. 1, Dec. 4, 1990, pp. 383-387.
Baer Richard L.
Flory Curt A.
Finley Rose M.
Hewlett--Packard Company
Williams Hezron E.
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