Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Towards Photonic based Pascal Realization as a Primary Pressure Standard



Jacob E. Ricker, Jay H. Hendricks, Patrick F. Egan, Jack Stone, Kevin O. Douglass, Gregory Scace


New techniques using refractometry have enabled gas pressure to be measured using laser interferometry. Two key techniques have been studied at NIST which include the Fixed Length Optical Cavity (FLOC) and the Variable Length Optical Cavity (VLOC). The measurement techniques are described and the traceability of these measurements through quantum mechanics that enables them to be primary standards. This technology is critical for gas pressure metrology to move away from artifact based standards (and especially mercury based) and move to quantum based methods for realization of the pascal.
Journal of Physics: Conference Series


Pressure, Pascal, Photonic, Refractometry, Metrology


Ricker, J. , Hendricks, J. , Egan, P. , Stone, J. , Douglass, K. and Scace, G. (2019), Towards Photonic based Pascal Realization as a Primary Pressure Standard, Journal of Physics: Conference Series (Accessed May 20, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created February 7, 2019, Updated June 19, 2019