Presby H M, Marcuse D, Astle H W
Appl Opt. 1978 Jul 15;17(14):2209-14. doi: 10.1364/AO.17.002209.
A video-based system, which analyzes the output field of an interference microscope directly, has been developed to measure automatically the refractive-index distribution of optical fibers. Selected regions of the fringe field, detected with a silicon-vidicon, are digitized to 8-bit accuracy by an addressable video digitzer controlled with a programmable calculator. The calculator also makes fringe displacement measurements, corrects for certain misalignments, computes and plots the profile, and determines a best-fit power-law (alpha) curve. Profiles, with relative Deltan measured accurate to a few parts in 10(5), obtained at different wavelengths and for different fiber orientations are presented.
已开发出一种基于视频的系统，该系统可直接分析干涉显微镜的输出场，用于自动测量光纤的折射率分布。用硅靶视像管检测到的条纹场选定区域，由一台由可编程计算器控制的可寻址视频数字化仪以8位精度进行数字化处理。该计算器还进行条纹位移测量，校正某些未对准情况，计算并绘制轮廓图，并确定最佳拟合幂律（α）曲线。文中给出了在不同波长和不同光纤取向条件下获得的相对Δn测量精度达到10的5次方分之几的轮廓图。
