圆光栅均匀性和调制度的数字检测

Digital Measurement of the Modulation and the D.C Level Shifting Rate of the Grating Discs

本文提出一种新的圆光栅均匀性和调制度检测方法。通过对莫尔信号的离散采集和数字化处理,可以抽样获取某些位置的信号平均幅值和调制度,在进一步的数据处理下可获得平均幅值漂移率。利用这种数字化检测方法不需要附加外部设备,实现了以软件工作代替原来人工、机构和硬件完成的工作;整个过程自动化,由计算机自动输出结果,速度快。另外,采用这种数字化方法有利于实现圆光栅多个指标的同时检测,计算机的数据处理功能已使某种意义上的信号质量改善得以实现。

A new method for measuring the modulation and the D. C lavel shifting rate of a grating disc is proposed in this paper. The values of the D. C level and the modulation are given by collecting sample data of Moire signals and digital processing, without requirement of additional equipment. Some of the work is carried out by software, rather than hardware and manual work. The whole work can be digitally finished quickly and automatically. Besides, the quality of the signals can be improved by the digital processing of the microcomputer and thus the high Accuracy can be obtained.