Measuring refractive index of glass by using two captures under speckle field illumination

Changliang Guo; Dayan Li; Damien P. Kelly; John T. Sheridan

doi:10.1117/12.2186306

9 September 2015 Measuring refractive index of glass by using two captures under speckle field illumination

Changliang Guo, Dayan Li, Damien P. Kelly, John T. Sheridan

Proceedings Volume 9598, Optics and Photonics for Information Processing IX; 95980M (2015) https://doi.org/10.1117/12.2186306
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Measurement of the refractive index of regular shaped glass by speckle correlation is reported. One intensity image in the diffraction field of a speckle-illuminated sample is captured by a CCD before the presence of glass sample and another intensity image is captured after the presence of glass sample. As the position of peak correlation coefficient is quantitatively related to the change in optical path length arising due to the presence of glass, the refractive index of the glass can be evaluated by the correlation of the intensity images before and after the glass insertion. The theoretical correlation function is first derived that describes the relationship between optical path length change and speckle decorrelation. In experiment, various regular shaped glasses are measured to demonstrate the accuracy and robustness of the proposed technique.

Citation Download Citation

Changliang Guo, Dayan Li, Damien P. Kelly, and John T. Sheridan "Measuring refractive index of glass by using two captures under speckle field illumination", Proc. SPIE 9598, Optics and Photonics for Information Processing IX, 95980M (9 September 2015); https://doi.org/10.1117/12.2186306

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