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Proceedings Paper

Measurement of optical glass refractive index free from effect of environmental temperature
Author(s): Jian-rong Ma; Qun Hao; Qiu-dong Zhu; Yao Hu; Xu Cheng
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Paper Abstract

A method based on measurement of critical refraction angle is proposed for measurement of optical glass refractive index independent of environment temperature. The critical refraction angle difference between the test sample and a standard refractive index block is measured first, and then the refractive index difference is obtained by a linear regression algorithm and the refractive index of the sample can be calculated from it. The requirement for environmental temperature is 25±5 °C , which can be easily satisfied on the production line. Compared with the non-linear algorithm used for direct measurement, this method is simpler, more efficient, and can directly get the refractive index value at standard temperature. Experimental result shows that the measurement repeatability is 1×10-5. The method can be used for fast and accurate measurement of the refractive index for the same glass material in mass production (e.g. X-cube made of K9 optical glass).

Paper Details

Date Published: 28 December 2010
PDF: 7 pages
Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 754471 (28 December 2010); doi: 10.1117/12.885236
Show Author Affiliations
Jian-rong Ma, Beijing Institute of Technology (China)
Qun Hao, Beijing Institute of Technology (China)
Qiu-dong Zhu, Beijing Institute of Technology (China)
Yao Hu, Beijing Institute of Technology (China)
Xu Cheng, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 7544:
Sixth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Xianfang Wen, Editor(s)

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