正透镜

实验室正透镜焦距测量方法之CCD成像技术的运用

The convex lens focal distance measurement method of imaging technology with CCD

基于液晶分划和数字图像处理的正透镜焦距测量研究

Study focus measurement based on LCD and digital image processing

其中，最主要的特点是傅里叶透镜组与准直扩束系统共用同一片正透镜。

The main characteristic of the designed optical system is that Fourier transforms lens and collimating and beam expanding system uses the same lens .

本文从理论上分析了因孔洞而产生的正透镜或负透镜效应并给出了归一化透过率的表达式。

We analyze the positive and negative lens effect caused by the hole theoretically and give the expression of normalized transmittance in this condition .

通过对比分析光斑变化趋势，热容方式运行的钕玻璃激光器的热透镜效应是负透镜效应，明显有别于常规方式运行的正透镜效应。

The contrastive facular pictures show that the thermal lens effect of heat capacity operation is negative lens effect not same as convex effect of general water-cooling operation .

在实验部分，本文给出了热气体透镜焦距与输入功率、缓冲气体压强的关系，描绘了热气体透镜从负透镜变化到正透镜的动态过程。

As results of the experiment , the relations between the focal length of the thermal gas lens and the input power and buffer gas pressure are presented . The evolution process of the thermal gas lens from concave to convex lens is described .

提出了一种测定正、负透镜折射率的简单方法。

In this paper , a simple method for measure the refractive index of the thin lenses is presented .

在测量中，根据莫尔条纹的斜角确定正、负透镜的焦距。

In the measurements , the focal lengths of positive and negative lens are determined by the tilt angle , of the Moire fringe .

大多数人熟悉的是具有正折射率的透镜，常见于照相机、大镜、微镜及望远镜之中。

Most of us are familiar with positive-index lenses - in cameras , magnifying glasses , microscopes and telescopes .