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Optical Engineering

High-accuracy absolute measurement of the refractive index of air
Author(s): GuangPing Xie; You-Jin Wang; Lynn J. Reiter; John C. Tsai
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Paper Abstract

A high-accuracy absolute measurement system of the refractive index of air is proposed. The measurement of the instantaneous index of refraction is achieved by comparing two laser optical paths with a differential laser interferometer. The vacuum optical path length is varied via a motor-driven trapezoidal vacuum cavity moving through a known distance. Compared to other measurement methods, the sealed vacuum cavity requires no vacuum pumping between measurements, and allows this method to function well in industrial applications. The measurement accuracy is better than 5×10–8.

Paper Details

Date Published: 1 April 2004
PDF: 4 pages
Opt. Eng. 43(4) doi: 10.1117/1.1666860
Published in: Optical Engineering Volume 43, Issue 4
Show Author Affiliations
GuangPing Xie, Excel Precision Corp. (United States)
You-Jin Wang, Excel Precision, Inc. (United States)
Lynn J. Reiter, Excel Precision, Inc. (United States)
John C. Tsai, Excel Precision, Inc. (United States)

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