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Differential phase contrast acoustic microscopy

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3 Author(s)
Routh, H.F. ; Bio-Imaging Res. Inc., Lincolnshire, IL, USA ; Pusateri, T.L. ; Nikoonahad, M.

The acoustic counterpart of the Nomarski differential-phase optical microscope is described and demonstrated at 50 MHz. A phase sensitivity of 190 mV/degree with a noise floor at 10 mV in a 1 kHz bandwidth was measured for this instrument. This suggests that the minimum measurable height with this system is 22 Å. A variety of images obtained from metal surfaces and composite materials is presented

Published in:

Ultrasonics Symposium, 1989. Proceedings., IEEE 1989

Date of Conference:

3-6 Oct 1989