A simple method to measure refractive index of optical glasses using focal displacement method

Neeraj Pandey; M. P. Singh; L. M. Pant; A. Ghosh

doi:10.1117/12.2181509

15 June 2015 A simple method to measure refractive index of optical glasses using focal displacement method

Neeraj Pandey, M. P. Singh, L. M. Pant, A. Ghosh

Proceedings Volume 9654, International Conference on Optics and Photonics 2015; 96540L (2015) https://doi.org/10.1117/12.2181509
Event: International Conference on Optics and Photonics 2015, 2015, Kolkata, India

Abstract

A method is presented to measure refractive index of a plane parallel plate of optical glass. We have applied focal displacement method to measure refractive index of a plane parallel plate of an optical glass having thickness of the order of millimeters. The best focus position is found by applying edge detection algorithm. We have measured LAF2 optical glass using focal displacement method and obtained the value 1.746, which is within 0.1% of the standard value 1.747 at 555 nm. In comparison to Abbe refractometer, this method is simple in terms of sample preparation, experimental set up and for measuring high refractive index of Zinc Sulfide. Using this method, refractive indices of other optical glasses are also measured.

Citation Download Citation

Neeraj Pandey, M. P. Singh, L. M. Pant, and A. Ghosh "A simple method to measure refractive index of optical glasses using focal displacement method", Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 96540L (15 June 2015); https://doi.org/10.1117/12.2181509

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KEYWORDS

Glasses

Refractive index

Edge detection

Cameras

Detection and tracking algorithms

Optical testing

Zinc

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