Acoustic Microscopy at Cryogenic Temperatures.
Abstract
During this six month period we completed construction of a mechanical scanning device compatible with our dilution refrigerator and suitable for use at very low temperatures. This device has now been thoroughly tested and was used to record our first acoustic images in liquid helium at temperatures below 0.1 K. This report describes the design of the mechanical scanner and presents the first micrographs taken in this new regime of imaging. We also present theoretical results which account for much of the nonlinear imaging behavior described in the previous status report. In particular we investigate the theory of resolution improvement when high acoustic intensities are used, and quantitatively account for the onset of nonlinear excess attenuation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1982
- Accession Number
- ADA113312
Entities
People
- Calvin Quate
- J. Heiserman
Organizations
- Stanford University