Acoustics – Sound-modifying means – Lens
Patent
1987-06-02
1989-11-21
Fuller, B. R.
Acoustics
Sound-modifying means
Lens
181175, G10K 1106
Patent
active
048816183
ABSTRACT:
An acoustic lens for use in an acoustic microscope including a solid state medium for propagating an acoustic wave having a wavelength .lambda. and having opposed end surfaces, an electric-acoustic transducer applied on one end surface of the solid state medium and having a radius a, and a spherical lens portion formed in the other end surface of the solid state medium and having an aperture of a radius w. The length l and the aperture radius w are normalized by the transducer radius a such that Z=l.lambda./a.sup.2 and W=w/a. Values of Z and W are selected from such a region in a first quadrant of the Z-W coordinate system that desired power and/or phase are obtained. The region neighboring the point Z=1 and W=1 is excluded.
REFERENCES:
patent: 3295629 (1967-01-01), Papadakis
patent: 3687219 (1972-08-01), Langlois
patent: 3825887 (1974-07-01), Murry
patent: 3866711 (1975-02-01), Folds
patent: 4651850 (1987-03-01), Mastsuo
"Acoustic Microscopy by Mechanical Scanning" by R. A. Lemons, May, 1975 M. L. Report No. 2456.
"Characteristic Material Signatures by Acoustic Microscope" by R. D. Weglein and R. G. Wilson in "Electronics Letters", vol. 14, No. 12, Jun. 6, 1978.
"An Angular-Spectrum Approach to Contrast in Reflection Acoustic Microscopy" by A. Atalar in "Journal of Applied Physics", vol. 49, No. 10. pp. 5130-5139.
"Modulation Transfer Function for the Acoustic Microscope" by A. Atalar in "Electronics Letters", vol. 15, No. 11, May 24, 1979.
"Ray Interpretation of the Material Signature in the Acoustic Microscope" by W. Parmon and H. L. Berton, in "Electronics Letters", vol. 15, No. 21, Oct. 11, 1979.
Tateoka Hitoshi
Uchino Fumio
Fuller B. R.
Olympus Optical Co,. Ltd.
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