论文信息 - Accurate measurement of the refractive index of air

Accurate measurement of the refractive index of air

Abstract An interference refractometer for absolute measurement of the refractive index of air has been developed. It is essentially based on components of a commercial Zeeman type laser interferometer system and uses a differential interferometer and a vacuum chamber with four measurement cells. The resolution and accuracy of interference phase interpolation is improved by an electronic phase meter and a detection technique which compensates for interferometer non-linearity. The system has been designed for an accuracy of a few parts in 10 8 . Experimental investigations of individual components and comparison measurements with pure gases, with Edlen's formula and with the BCR interference refractometer confirm this goal.

R. Thalmann | W. Hou | R. Thalmann | W. Hou

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