Cryogenic Acoustic Microscopy.

Abstract

The progress on the ultra-high resolution acoustic microscope is described. Two main areas are investigated: signal-to-noise ratio and a mechanical scanner. The signal-to-noise ratio (SNR) is improved by developing higher efficiency acoustic transducers for generating coherent sound and superconducting bolometers for broadband detection of sound. Some experiments to understand the effects of pressurizing liquid helium on the propagation of high intensity focused sound waves in superfluid helium are described. The possibility of utilizing parametric amplification of sound in liquid helium to improve the SNR is reported. Finally, the design and development of a new scanner which will have a wider scanning range with great precision operating in pressurized liquid helium are also described.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1986
Accession Number
ADA173188

Entities

People

  • Calvin Quate

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Microscopes
  • Acoustic Propagation
  • Acoustic Waves
  • Bandwidth
  • Critical Temperature
  • Detection
  • Diagrams
  • Electric Fields
  • Electric Motors
  • High Pressure
  • High Resolution
  • Microscopes
  • Microscopy
  • Radiation Resistance
  • Sound Waves
  • Thin Films
  • Transducers

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Image Processing and Computer Vision.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.