Absolute Length Measurement at High Pressure

Publisher Website
Google Scholar
Abstract
A length measurement system is described which can make absolute length change measurements of a meter long specimen within a pressure vessel (to pressures of 8 kilobar) with a fractional 3σ random error of ± 6 × 10−8 and a possible systematic error of less than 4 × 10−7 for changes in length of 1 cm. Possible uses of such a system for measuring the volume thermal expansivity (at pressure) and the isothermal bulk modulus (at pressure) are described. Moreover it is noted that when this system is combined with an ultrasonic velocity measurement system, the adiabatic bulk modulus (at pressure) and Grüneisen parameter as a function of pressure can be directly determined and the absolute pressure itself can be measured.

This publication has 10 references indexed in Scilit: