What is it about?
Silica glass will undergo density increase when exposed to pressure. At ambient temperature, density increase begins near 9 GPa and reaches maximum density increase of 21% near 20 GPa. This density increase is well-calibrated and can be used to determine the pressure reached in devices which which offer no means of pressure determination while in use.
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Why is it important?
We show in this paper how optical methods (Raman spectroscopy) can be used to determine the density increase of a silica glass sample after recovery from exposure to high pressures. Radial & axial Raman profiles can determine the achieved pressure distribution within the sample chamber.
Perspectives
Using silica glass in this way is nearly a 100-year old idea, but density increase of silica glass is sensitive to temperature, pressure uniformity, time of pressure application, and time of measurement after pressure release. Untangling these factors has not been achieved until now, in doing so we allow a robust means of pressure calibration to be utilized.
Dr. Michael Guerette
GE Aviation
Read the Original
This page is a summary of: Permanent densification of silica glass for pressure calibration between 9 and 20 GPa at ambient temperature, High Pressure Research, January 2019, Taylor & Francis,
DOI: 10.1080/08957959.2019.1580364.
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