High-pressure calibration with a new absolute-pressure gauge

Abstract

Based on the simultaneous measurement of length and transit time of a specimen under pressure, we have developed a new way of determining absolute high pressure. The mercury freezing point at 0 °C has been determined with this new method at 7571.2±1.6 bar. Accurate high-pressure calibration of a secondary-pressure gauge such as a manganin gauge is possible with this method. The maximum deviation from linearity of the present gauge studied is 11.6±0.1 bar between atmospheric pressure and the mercury freezing point at 0 °C.