TITLE

Restricted aperture acoustic microscope lens for Rayleigh wave imaging

AUTHOR(S)
Davids, D. A.; Wu, P. Y.; Chizhik, D.
PUB. DATE
April 1989
SOURCE
Applied Physics Letters;4/24/1989, Vol. 54 Issue 17, p1639
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The performance of an acoustic microscope lens is reported that permits both Rayleigh wave velocity measurement of anisotropic media as well as raster-scanned imaging. The lens surface is spherical and uses a circular p-wave transducer; however, an acoustic absorbing layer is applied to the spherical surface in order to limit the angular range over which Rayleigh waves are launched. When operated at 50 MHz, a lens having a slot-like aperture of 0.8 mm width permits measurement of VR (θ) of y-cut quartz with a maximum error of less than 2%. The same system employed in imaging provides spatial resolution of about one wavelength in a direction parallel to the axis of the slot and between two and three wavelengths in the perpendicular direction.
ACCESSION #
9830978

 

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