THERMODYNAMIC EFFECTS IN A GAS MODULATED INVAR-BASED DUAL FABRY-PÉROT CAVITY REFRACTOMETER ADDRESSING 100 KPA OF NITROGEN

T. Rubin, I. Silander, J. Zakrisson, M. Hao, C. Forssén, P. Asbahr, M. Bernien, A. Kussicke, K. Liu, M. Zelan, O. Axner

Abstract

An Invar-based dual Fabry-Pérot cavity refractometer used for assessments of pressure by the gas modulation refractometry (GAMOR) methodology has been scrutinized with respect to the influence of thermodynamic effects (pV-work) that originates from the gas exchange process when 100 kPa of nitrogen is addressed. It is shown that the actual temperature variation of the cavity spacer solely is a fraction of the previously assessed upper limits (0.5 mK/100 kPa), limited to sub-parts-per-million (ppm) levels. This finding additionally supports the conclusion that the thermodynamic effects will not be a limiting factor when the system is used for assessments of pressure.

Keywords

pressure; pV-work; refractometry; gas modulation; Fabry-Perot cavity

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IMEKO-TC16-2022-117.pdf

DOI

10.21014/tc16-2022.117

IMEKO TC

TC16 - Pressure and Vacuum Measurement

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