Exploring the method of measuring the refractive index of parallel transparent materials by tolansky interferometer
To improve the measurement accuracy of refractive index of parallel transparent materials,a refractive in-dex measurement method based on Tolansky interference is proposed.Through the analysis of geometric optics theory,the relationship between the lateral displacement of the center of the Tolansky interference concentric ring and the refrac-tive index was established.A parallel transparent material refractive index measurement simulation model was construc-ted,virtual experimental research on the measurement method was conducted,and the feasibility of the method was ex-amined.An experimental system was built to measure the refractive index of glass sheets,which was compared with oth-er instruments.The experimental results show that after measuring the material rotation angle,interference ring center lateral displacement,and material thickness,the relative error between the calculated refractive index value and the theo-retical value is only 0.11％,providing a new feasible solution for high-precision measurement of refractive index.The un-certain evaluation results indicate that the measurement results of this method are most affected by the thickness of the tested material.
physical opticsrefractive indextolansky interferenceconcentric ring
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