Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1991-06-21
1992-05-26
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310312, 73 232, 73 2401, 73 32A, 73597, H01L 4108
Patent
active
051171465
ABSTRACT:
Solid-state acoustic sensors for monitoring conditions at a surface immersed in a liquid and for monitoring concentrations of species in a liquid and for monitoring electrical properties of a liquid are formed by placing interdigital input and output transducers on a piezoelectric substrate and propagating acoustic plate modes therebetween. The deposition or removal of material on or from, respectively, a thin film in contact with the surface, or changes in the mechanical properties of a thin film in contact with the surface, or changes in the electrical characteristics of the solution, create perturbations in the velocity and attenuation of the acoustic plate modes as a function of these properties or changes in them.
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Martin Stephen J.
Ricco Antonio J.
Budd Mark O.
Chafin James H.
Moser William R.
Ojanen Karla
The United States of America as represented by the United States
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