Measurement of optical glass refractive index free from effect of environmental temperature

Jian-rong Ma; Qun Hao; Qiu-dong Zhu; Yao Hu; Xu Cheng

doi:10.1117/12.885236

28 December 2010 Measurement of optical glass refractive index free from effect of environmental temperature

Jian-rong Ma, Qun Hao, Qiu-dong Zhu, Yao Hu, Xu Cheng

Proceedings Volume 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation; 754471 (2010) https://doi.org/10.1117/12.885236
Event: Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010, Hangzhou, China

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).

Citation Download Citation

Jian-rong Ma, Qun Hao, Qiu-dong Zhu, Yao Hu, and Xu Cheng "Measurement of optical glass refractive index free from effect of environmental temperature", Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 754471 (28 December 2010); https://doi.org/10.1117/12.885236

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KEYWORDS

Refractive index

Temperature metrology

Glasses

Prisms

Refraction

Environmental sensing

Error analysis

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