Method and apparatus for efficiently generating elastic waves wi

Details Method and apparatus for efficiently generating elastic waves wi Method and apparatus for efficiently generating elastic waves wi

1979-04-25

1981-02-03

Ciarlante, Anthony V.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

042480922

ABSTRACT:
Disclosed is a method for generating an ultrasonic wave in a material, utilizing a transducer adapted to induce a higher than fundamental mode wave in the material and a signal generator adapted to drive the transducer at a frequency above the cutoff frequency below which the higher mode wave will not propagate. For a horizontal shear wave, optimal transducer efficiency is obtained by selecting a driven frequency between a minimum cutoff frequency f.sub.c =v.sub.s n/2t and an upper frequency sufficiently close to f.sub.c to drive the transducer with at least a preselected increase in efficiency.

REFERENCES:
patent: 3786672 (1974-01-01), Gaerttner
patent: 3850028 (1974-11-01), Thompson et al.
patent: 4058002 (1977-11-01), Moran
patent: 4127035 (1978-11-01), Vasile

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