Towards Photonic based Pascal Realization as a Primary Pressure Standard
J Ricker1, J Hendricks1, P Egan2
1Thermodynamic Metrology, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA.
Abstract:
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.
Related Concept Videos
Pascal's Law
Application of Pascal's Law
Hydraulic systems are used to operate automotive brakes, hydraulic jacks, and numerous other mechanical systems. We can derive a relationship between the forces in a simple hydraulic system...
Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer
Fluid Pressure
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific...
Measurement of Fluid Pressure
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
Pressure Gauges


