Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-10-28
1996-07-02
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313A, H01L 4108
Patent
active
055325386
ABSTRACT:
A new type of acoustic wave which is nearly polarized in the shear horizontal direction, and which can propagate in thin elastic plates if the ratio h/.lambda. is less than about 3 where h is the plate thickness and .lambda. is the acoustic wavelength. Attractive properties of this quasi-SH wave include: (i) nearly nondispersive propagation, (ii) very large value of K.sup.2, the electromechanical coupling coefficient, and (iii) ability to propagate in contact with a liquid medium without suffering excessive attenuation. The nondispersive propagation and large value of K.sup.2 makes the wave attractive for use in signal processing and sensing devices. Further, the fact that the wave can propagate in contact with a liquid medium allows the wave to be used in sensors that have to operate in contact with a liquid medium.
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Jin Yu
Joshi Shrinivas G.
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