STEPWISE INTERFEROMETRIC METHOD OF MEASURING THE REFRACTIVE-INDEX OF LIQUID SAMPLES

被引：16
|
作者：
LI, TC
TAN, XD
机构：
[1] National Institute of Metrology, Beijing
[2] Xian Institute of Technology, Xian
来源：
APPLIED OPTICS | 1993年 / 32卷 / 13期
关键词：
REFRACTOMETRY; REFRACTIVE INDEX; LIQUID; INTERFEROMETRY;
D O I：
10.1364/AO.32.002274
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An iterative interferometric technique for accurately determining the refractive index (RI) of liquid samples is presented. The liquid is measured in an extremely stable stepped cell that is inserted into one arm of a Michelson-type interferometer. The uncertainty of the RI measurement is repeatedly improved by taking successive measurements of the interferometric fringe shifts on adjacent steps in the cell. It is shown that in practice the temperature nonuniformity in the liquid limits the ultimate uncertainty of the RI measurement. The RI resolution of the apparat;us described is designed to be 4.3 x 10E-6, and the final RI uncertainty is 1.2 x 10E-5 (2sigma) for a liquid with a RI temperature coefficient of 4 x 10E-4.
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页码：2274 / 2277
页数：4
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