The scanning acoustic microscope utilizes a beam of fixed angular illumination with large numerical aperture limiting the amount of information that is obtainable. It is suggested that a multizone transducer–spherical‐lens configuration can yield a more flexible acoustic illumination source. Numerical calculations indicate that it should be possible to vary the half‐angle of the illumination from about 5° to 57°, thus allowing an estimate of the specimen acoustic impedance to be made and critical angles determined experimentally. A fast, programmed microprocessor will be essential for phase‐amplitude control of individual zones and signal detection.
REFERENCES
1.
2.
R. Kompfner and C. F. Quate, Physics in Technology (1977), p. 231.
3.
4.
5.
G. Chao, B. A. Auld, and D. K. Winslow, in IEEE Ultrasonics Symposium Proceedings (IEEE, New York, 1972), p. 140.
6.
This content is only available via PDF.
© 1980 American Institute of Physics.
1980
American Institute of Physics
You do not currently have access to this content.