高精度测量光学玻璃折射率的一种新方法

摘要: 准确测量光学玻璃的折射率已成为了保证光学系统成像质量非常重要的环节。本文介绍了光学玻璃折射率测试方法和国内外发展现状。提出了一种利用测量棱镜三个顶角所对应的三个最小偏向角的折射率测量新方法，该方法的特点是测量精度随被测光学玻璃的折射率增大而提高。在精度0.5²的测角仪上，折射率测量精度高于1x10-6。文中推导出了新方法的计算公式，并对精度做了理论分析。该方法由于测量精度高，有较好的应用前景。

A New Method for High Accurate Determination of Refractive Index of Optical Glass

In order to measure accurately the refractive index of optical glass to improve the imaging quality of optical systems,several measuring methods of refractive index for optical glass were analyzed and both foreign and domestic development situations for optical glass measurement were introduced.A new method to calculate refractive index by measuring the three least deflection angles of three vertex angles of a prism was presented.Proposed new method made full use of the orientation dominance of complementary method or three-image method improve the accuracy of refractive index measurement,and it was characteriszed by the accuracy improvement of refractive index measurement with refractive index increasing.The formula of new method was deduced,the measurement accuracy was analyzed in the theory.Result indicates that measurement accuracy has improved more than twice as compare with that of traditional least deflection angle method,which can meet the requirement of high accuracy measurement of refractive index.