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Focusing of an ultrasonic beam by a curved interface

✍ Scribed by Hyung-Chul Choi; John G. Harris


Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
966 KB
Volume
12
Category
Article
ISSN
0165-2125

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Focusing of flattened Gaussian beams by
✍ Xiaoling Ji; Baida LΓΌ πŸ“‚ Article πŸ“… 2003 πŸ› Elsevier Science 🌐 English βš– 232 KB

Focusing properties of attened Gaussian beams (FGBs) passing through an annular lens is studied based on the Collins formula. It is found that the on-axis irradiance distributions of focused FGBs are unsymmetrical with respect to the geometrical focal plane even for large values of Fresnel number Fw