Method and apparatus for exciting bulk acoustic wave

Details Method and apparatus for exciting bulk acoustic wave Method and apparatus for exciting bulk acoustic wave

1996-10-24

1998-08-18

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73632, 73655, 73657, G01N 2904

Patent

active

057960046

ABSTRACT:
In a method and an apparatus for exciting acoustic waves, the surface of an object is irradiated with coherent parallel energy beams and coherent focusing energy beams which have different frequencies in such a manner that they overlap each other to generate interference fringes (concentric circles) propagating from outside to the inside at propagation speed which is higher than a specific acoustic speed of the object. The acoustic waves are excited in accordance with distortion distribution generated in the surface of the object attributable to the photo-thermal effect of the interference fringes, the acoustic waves being focused to a small region in the object, the position of which is determined by the specific acoustic speed of the object and the propagation speed of the interference fringes.

REFERENCES:
patent: 3506327 (1970-04-01), Leith et al.
patent: 3978713 (1976-09-01), Penney
patent: 4541280 (1985-09-01), Cielo et al.
patent: 4581939 (1986-04-01), Takahashi
patent: 4683750 (1987-08-01), Kino et al.

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