New perspectives to improve accuracy of the molar gas constant using pneumatic photonic structures

Abstract

In this work, a method is proposed to determine the molar constant R with the relative standard uncertainty near 10^-10 that is based on an extra accurate volume controlling and high sensitive pressure measurements in the framework of scale echeloning procedure. An essential moment of the method is uniting of results for two measurement scales with increased relative standard uncertainty (10^-5) to obtain the higher precise level. The gas-filled 1D elastic pneumatic photonic crystal is proposed as an optical indicator of pressure which can unite several pressure scales of magnitude.