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Application of astigmatic method and snell's law on the thickness and refractive index measurement of a transparent plate

机译：象散法和斯涅尔定律在透明板厚度和折射率测量中的应用

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摘要

In this study, a thickness and refractive index measuring system for the transparent plate has been proposed. The measuring system is composed of an astigmatic measurement module and a light spot measurement module using a DVD optical pickup, a laser diode and a quadrant photodiode detector. Both of the thickness and refractive index of a transparent plate are converted into the focusing error of DVD pickup based on astigmatic method and the light spot displacements based on snell's law in our proposed system. The thickness and the refractive index are simultaneously calculated by means of two nonlinear formulas. The accuracy of the proposed system is 99% verified by a height Gauge and the refractive index by the TF-166.
机译：在这项研究中，已经提出了用于透明板的厚度和折射率测量系统。该测量系统由像散测量模块和使用DVD光学头，激光二极管和象限光电二极管检测器的光斑测量模块组成。在我们提出的系统中，将透明板的厚度和折射率都转换为基于像散方法的DVD拾取器的聚焦误差和基于斯涅尔定律的光点位移。厚度和折射率是通过两个非线性公式同时计算的。所提出系统的精度通过高度计和TF-166的折射率得到了99％的验证。

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