Elsevier

Physica B+C

Volumes 109–110, July 1982, Pages 1978-1989
Physica B+C

Cryogenic acoustic microscopy: The search for ultrahigh resolution using cryogenic liquids

https://doi.org/10.1016/0378-4363(82)90223-6Get rights and content

Abstract

Cryogenic liquids have shown considerable promise as coupling liquids for use in high resolution acoustic microscopy. Using liquid nitrogen and argon, images have been obtained with excellent contrast and exhibiting resolution equal to high quality optical micrographs. Using an acoustic wavelength of 0.36 μm, images have been produced in superfluid helium held at 1.95 K. At very low temperatures even better performance is possible. Initial studies have been performed for frequencies near 1 GHz and at temperatures in the range 0.1–0.5 K. Attenuation has been evaluated and found to scale as the fourth power in temperature. Using an acoustic lens, a focused acoustic beam was studied and the onset of nonlinear effects at high input power was observed. Using existing data and theory, the ultimate performance of the acoustic microscope in superfluid helium can be evaluated.

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