| Acoustic Microscopy at Cryogenic Temperatures |
JAN 1982 |
|
| Authors:
C. F. Quate; J. Heiserman; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
|
 | 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 ... |
|
| Acoustic Microscopy at Cryogenic Temperatures |
NOV 1981 |
13 pages |
| Authors:
C. F. Quate; J. Heiserman; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
|
 | This report summarizes our progress in a research program devoted to high resolution acoustic microscopy and cryogenic temperatures. During the past year we have studied the acoustic properties of two cryogenic fluids - liquid argon and liquid 4He below the temperature of 0.5 degrees K. In argon we have determined that nonlinear effects provide us with a dramatic increase in resolving power for focused acoustic beams. In liquid helium we ... |
|
| Acoustic Microscopy at Cryogenic Temperatures. |
JUL 1980 |
|
| Authors:
C. F. Quate; J. Heiserman; STANFORD UNIV CA EDWARD L GINZTON LAB
|
| This report summarizes our progress in development of high resolution acoustic microscopes for use at cryogenic temperatures. During the past year we have concentrated on development of efficient acoustic matching layers for use in liquid helium and extension of our techniques to temperatures below 0.5K in liquid helium. As a first step at these low temperatures, we have begun probing the acoustic properties of the liquid at frequencies at least ... |
|
| cryogenic acoustic microscopy |
MAY 80 |
|
| Authors:
J. Heiserman; D. Rugar; C. F. Quate
|
| resolution in the scanning acoustic microscope is determined by wavelength which is in turn limited by attenuation in the acoustic medium. in order to make use of the low attenuation found in cryogenic liquids we have developed an acoustic microscope suited for use at low temperatures. in this paper we present images taken in liquid argon held at 85 deg k and in superfluid helium at 1.95 deg k. in ... |
|
| Acoustic Microscopy at Cryogenic Temperatures. |
SEP 1979 |
|
| Authors:
C. F. Quate; J. Heiserman; STANFORD UNIV CA EDWARD L GINZTON LAB
|
| We report progress in work on a cryogenic acoustic microscope. Results in liquid argon and nitrogen at about 4300 angstrom wavelength are discussed. Images of gratings and integrated circuits are presented as examples of resolution and contrast. Work on producing effective matching layers to improve acoustic power transfer between solids and helium is summarized. Finally we present images taken in superfluid helium held at 1.95 degrees K. A wavelength of ... |
|
| Acoustic Microscopy at Cryogenic Temperatures. |
29 SEP 1978 |
|
| Authors:
C. F. Quate; J. Heiserman; STANFORD UNIV CALIF EDWARD L GINZTON LAB
|
| During the past year work has been accomplished on developing an acoustic microscope in superfluid helium. In order to test the apparatus, we have studied its behavior using focussed beams in water and a plane beam in helium. Images of various objects have been produced using water and liquid argon as propagating media. Some initial work has been done towards producing quarter wave matching layers to reduce the interface loss ... |
|
Reports by Author
