B - Operations – Transporting – 06 – B
Patent
B - Operations, Transporting
06
B
B06B 1/00 (2006.01) G01N 29/04 (2006.01) G01N 29/14 (2006.01) G01N 29/24 (2006.01) G01N 29/34 (2006.01)
Patent
CA 2188705
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 inter- ference 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.
Nakaso Noritaka
Tsukahara Yusuke
Ridout & Maybee Llp
Toppan Printing Co. Ltd.
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