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TECHNICAL PAPERS

Recent Advances in Acoustic Microscopy for Nondestructive Evaluation

[+] Author and Article Information
C. Miyasaka, B. R. Tittmann

Department of Engineering Science and Mechanics, The Pennsylvania State University, 212 Earth Engineering Sciences Building, University Park, PA 16802

J. Pressure Vessel Technol 122(3), 374-378 (Apr 12, 2000) (5 pages) doi:10.1115/1.556195 History: Received March 01, 2000; Revised April 12, 2000
Copyright © 2000 by ASME
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References

Figures

Grahic Jump Location
Acoustic images obtained by focusing on back surface using (a) conventional, and (b) high N. A. lenses (frequency: 30 MHz)
Grahic Jump Location
Acoustic images of internal structures of a plastic mold IC package using conventional lenses—(a) frequency f=30 MHz, scanning size 12.0 mm×9.0 mm; (b) frequency f=50 MHz, scanning size 12.0 mm×9.0 mm; (c) frequency f=75 MHz, scanning size 12.0 mm×9.0 mm; (d) frequency f=110 MHz, scanning size 12.0 mm×9.0 mm  
Grahic Jump Location
Acoustic image of internal structures of the same plastic mold IC package using the high N. A. lens with a frequency at 30 MHz
Grahic Jump Location
Acoustic images obtained by focusing on back surface using (a) conventional and (b) high N. A. lenses (frequency: 30 MHz), wherein the images are from the IC chip internally located in the IC package. Clearly visible are the improvement in resolution and reduction in surface features for the high N. A. lens.
Grahic Jump Location
Schematic diagram of noncontact and air-coupled transducer

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