Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-04-06
1994-06-14
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310318, 310328, 367158, 367159, G01S 174, H01L 4104
Patent
active
053213335
ABSTRACT:
A low frequency torsional transducer for the generation and/or reception of shear waves in a substantially solid medium. The transducer includes a spool like radiating structure to which are fixedly attached spaced piezoelectric elements. The elements undergo shear movement upon being electrically excited or upon receiving shear waves. This shear movement causes the opposite ends of the radiating structure to move torsionally. The torsional movement causes radiation of shear waves which can be detected by a sensor and used to determine the degree of support for shear wave propagation in the media.
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Howarth Thomas R.
Walden Alan K.
Dougherty Thomas M.
McDonnell Thomas E.
Miles Edward F.
The United States of America as represented by the Secretary of
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