Towards an improved helium-based refractometer for pressure measurements

Zaccaria Silvestri (1) , Djilali Bentouati (1) , Pierre Otal (1) , Jean-Pierre Wallerand (1)

1 LCM - Laboratoire commun de métrologie LNE-CNAM

This paper describes a quantum realization of the pascal based a helium absolute refractometer at 532 nm. The short-term stability in pressure is ± 2 mPa with a resolution in pressure of this new optical pressure standard is better than 1 mPa with temperature stability about 1 mK. A new design of the refractometer is presented to have better temperature stability and accurate temperature measurements to reach uncertainties in pressure better than current conventional methods.

Keywords: refractometry; Fabry-Perot; pressure measurement; quantum pascal

Domains: Engineering Sciences [physics]

Zaccaria Silvestri, Djilali Bentouati, Pierre Otal, Jean-Pierre Wallerand. Towards an improved helium-based refractometer for pressure measurements. IMEKO TC16 - Pressure and Vacuum Measurement, 2020, Cavtat-Dubrovnik, Croatia. pp.305, ⟨10.21014/acta_imeko.v9i5.989⟩. ⟨hal-03911037⟩