Cryogenic acoustic microscopy. Annual technical report, 1 April 1985-31 March 1986

Technical Report · Tue Jul 01 00:00:00 EDT 1986

OSTI ID:7005037

Quate, C F

The progress on the ultrahigh-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 with a wider scanning range with great precision operating in pressurized liquid helium are also described.

• Research Organization: Stanford Univ., CA (USA). Edward L. Ginzton Lab.
• OSTI ID: 7005037
• Report Number(s): AD-A-173188/4/XAB; GL-4068
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACOUSTIC MICROSCOPY
IMAGE SCANNERS
SIGNAL-TO-NOISE RATIO
BOLOMETERS
GALLIUM ARSENIDES
SUPERCONDUCTING DEVICES
SUPERFLUIDITY
TRANSDUCERS
ZINC OXIDES
ARSENIC COMPOUNDS
ARSENIDES
CHALCOGENIDES
GALLIUM COMPOUNDS
MEASURING INSTRUMENTS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
ZINC COMPOUNDS
420201* - Engineering- Cryogenic Equipment & Devices