Ultrasonic transducers and applications thereof

Details Ultrasonic transducers and applications thereof Ultrasonic transducers and applications thereof

1984-01-26

1985-05-28

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

128663, G01F 166

Patent

active

045192600

ABSTRACT:
Transducer structures for use in volume flow measurements which generate a first uniform beam and a second focused beam within the uniform beam. The transducer may include concentric elements, a linear array, or combinations thereof. In a two element concentric array, a central disc generates a uniform beam and a peripheral annular element having a lens thereon defines a second focused beam within the first beam. In a linear array a plurality of juxtaposed linear elements define a scan surface and a segmented element within the linear element array defines a focused reference sample volume within the scanned surface. A concentric array having a plurality of annular elements is driven with amplitude weighting of each element in accordance with a Fourier-Bessel approximation to the desired beam pattern thereby electronically achieving ultrasonic beam width control.

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patent: 4155259 (1979-05-01), Engeler
patent: 4371805 (1983-02-01), Diepers et al.

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