Computer Science – Sound
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rsci...46.1016c&link_type=abstract
Review of Scientific Instruments, Volume 46, Issue 8, pp. 1016-1020 (1975).
Computer Science
Sound
High-Pressure Apparatus, Shock Tubes, Diamond Anvil Cells
Scientific paper
A pressure gauge is described which accurately measures high static pressures. It features continuous digital readout, simple construction, and freedom from aging and hysteresis effects. While this device is thoroughly tested over the pressure range 170-1000 bar, its characteristics can be reliably extrapolated to 7000 bar. As tested, the maximum pressure uncertainty is typically 0.1%, and substantial improvement is anticipated with minor design modification. This gauge is shown to be a practical alternative to the commonly used manganin cell at pressures less than 7000 bar. It uses the well-established principle of the acoustic dilatometer: A compressible fluid (n-hexane) is contained in a closed volume by a piston of mercury, and the height of the free mercury surface is accurately monitored using a sound-ranging (ultrasonic echo time) technique. Pressure changes cause the compressible fluid to expand or contract. This in turn changes the height of the mercury surface and hence also the ultrasonic echo time. Thus, a measurement of ultrasonic echo time provides an indication of the pressure on the system.
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