High-accuracy absolute measurement of the refractive index of air

被引：5

作者：

Xie, GP ^{[1
]}

Wang, YJ ^{[1
]}

Reiter, LJ ^{[1
]}

Tsai, JC ^{[1
]}

机构：

[1] Excel Precis Corp, Santa Clara, CA 95054 USA

来源：

OPTICAL ENGINEERING | 2004年 / 43卷 / 04期

关键词：

refraction index; air; laser interferometer; absolute measurement; vacuum cavity; vacuum pump;

D O I：

10.1117/1.1666860

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 X 10(-8). (C) 2004 Society of Photo-Optical Instrumentation Engineers.

引用

页码：950 / 953

页数：4

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