NDLI: Unidirectional bulk acoustic wave excitation by scanning interference fringes and its application to acoustical imagings

Content Provider	IEEE Xplore Digital Library
Author	Nishino, H. Tsukahara, Y. Cho, H. Sato, H. Yamanaka, K.
Copyright Year	1995
Description	Author affiliation: Tech. Res. Inst., Toppan Printing Co. Ltd., Saitama, Japan (Nishino, H.; Tsukahara, Y.)
Abstract	Excitation of high-frequency bulk acoustic waves (BAW) using scanning interference fringes (SIF) is presented. The SIF are produced by intersecting two coherent laser beams with different frequencies on an opaque specimen. It is possible to generate unidirectional BAW which propagate into the specimen by this method. Propagation direction of the BAW is determined by the phase-matching condition between the SIF and the wave front of the BAW at the surface, which could be controlled by incident angles of laser beams. The principle and verification of this method are briefly described in the first part. Application to the BAW velocity measurement was introduced and was experimentally verified using Si/sub 3/N/sub 4/ specimen. Acoustical imagings taken by the BAW generation method were also shown in the last part.
Starting Page	673
Ending Page	678
File Size	288484
Page Count	6
File Format	PDF
ISBN	0780329406
ISSN	10510117
DOI	10.1109/ULTSYM.1995.495662
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic waves Laser excitation Acoustic beams Laser beams Acoustic propagation Optical propagation Interference Frequency conversion Surface waves Surface emitting lasers
Content Type	Text
Resource Type	Article

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