The Short-Term Performances of Two Independent Gas Modulated Refractometers for Pressure Assessments

Refractometry is a powerful technique for pressure assessments that, due to the recent redefinition of SI system, also offers new route realizing unit pressure, Pascal. Gas modulation refractometry (GAMOR) methodology that has demonstrated an outstanding ability mitigate influences drifts and fluctuations, leading long-term precision in 10?7 region. However, its short-term performance, which importance variety applications, not yet been scrutinized. To assess this, we investigated performance (in terms precision) two similar, but independent, dual Fabry–Perot cavity refractometers utilizing GAMOR methodology. Both systems assessed same produced by dead weight piston gauge. That way, their responses were without being compromised any fluctuations gauge or gas delivery system. We found refractometer have significantly higher degree concordance 10?8 range at 1 s) than what either them with This shows under scrutiny are capable assessing rapidly varying pressures (with bandwidths up 2 Hz) range.