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).
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