焦距法测试自聚焦透镜折射率分布常数

本文介绍了一种测量自聚焦透镜折射率分布常数的方法─—焦距法，并进行了原理公式推导，和精度分析，其测量不确定度为±１×１０￣（－３）；其次，简要地介绍了实验方法。实验结果证明了焦距法是测量自聚焦透镜折射率分布常数的简单实用的方法，它具有装置简单、数据处理也不复杂的特点，是一种非破坏性的测试方法。

Testing distribution constant of refractive index of self-focussing lens by focus method

A method to test the distribution constant of refractive index of a self-focussing lens──focus method is presented,the fundamental formula is deduced and the accuracy is analyzed.The inde-terminacy is 1× 10￣(-3).The experimental method is also introduced briefly.It is proved by the results ofexperiments that focus method is a simple and practical method to test the index distribution constant ofthe self-focussing lens. It is a nondestructive method, noted for its simple device and uncomplicated da-ta treatment.