11 January 2005 Measuring refractive index of plate glass using joint transform correlative technique
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A method for measuring refractive index of plate glass by joint transform correlative technique is given. In the one of two correlative light beams passing through the two correlative images of certain separation in input plane, a unknown refractive index and known thickness plate glass is inserted with a certainty angle (θ). Joint transform power spectrum (JPS) is recorded separately at the back focal plane of the lens by a CCD detector when Θ = 90° or Θ = 45°, the JPS is sent to the LCD on the input plane by the computer. Then two groups of correlative points will be recorded separately by the CCD detector. On the basis of the interval difference value between two groups of altered correlative points, the refractive index is calculated. Theory analysis and examination result are given.
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Xueju Shen, Xueju Shen, Hongqi Gao, Hongqi Gao, Yongzhong Wang, Yongzhong Wang, Wensheng Hua, Wensheng Hua, R. Xue, R. Xue, Yong Zhang, Yong Zhang, } "Measuring refractive index of plate glass using joint transform correlative technique", Proc. SPIE 5642, Information Optics and Photonics Technology, (11 January 2005); doi: 10.1117/12.572958; https://doi.org/10.1117/12.572958

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