Penetration depth of the scanning acoustic microscope

Date
1985-03
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Source Title
IEEE Transactions on Sonics and Ultrasonics
Print ISSN
0018-9537
Electronic ISSN
2162-1403
Publisher
IEEE
Volume
32
Issue
2
Pages
164 - 167
Language
English
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Abstract

A definition for the penetration depth of the scanning reflection acoustic microscope is given. With this definition it is possible to calculate the penetration depth of a given lens geometry for a given material. The penetration depth depends on the elastic parameters of the object, the signal-to-noise ratio, and the operation frequency of the acoustic microscope. Calculations show that for high-impedance materials, the penetration depthis limited by the wavelength of the surface waves and hence by frequency. For low-impedance materials the opening angle of the lens can be properly selected to make the longitudinal or shear wave penetration dominant, effectively increasing the penetration well above the wavelength limit of the surface wave.

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