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Acoustic MicroscopySecond Edition$
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Andrew Briggs and Oleg Kolosov

Print publication date: 2009

Print ISBN-13: 9780199232734

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780199232734.001.0001

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Focusing and scanning

Focusing and scanning

(p.13) 2 Focusing and scanning
Acoustic Microscopy

G. A. D. Briggs

O. V. Kolosov

Oxford University Press

You cannot make a high resolution acoustic lens which will give an image of an extended object all at once. But it is possible to make an acoustic lens which has excellent properties on its axis. The refractive index for acoustic waves passing from a solid such as sapphire to a fluid such as water is n = 0.135, and as a result the geometrical aberrations for on‐axis focusing are almost negligible, and usually much less than a wavelength. By focusing on the axis and then scanning in a raster, a high resolution image can be built up. The first acoustic microscopes operated in transmission, with two lenses aligned confocally. Most acoustic microscopes operate in reflection, with a single confocal lens for both transmitting a wave and receiving the reflection. A grating with a period of 0.8 μm can be resolved with an acoustic frequency of 2 GHz.

Keywords:   lens, axis, refractive index, focus, aberration, transmission, reflection, confocal

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