圆光栅副多头取样信号分析

• 作 者: 沃具良 曹向群 陈远绳
• 机 构: 浙江大学,浙江大学,浙江大学
• 出 处: 仪器仪表学报
• 发表日期: 1987年1期
• 关键词: 圆光栅 中径 信号分析 合成信号 编程模拟 莫尔条纹 三角波 尔光 初相位 信号变化

本文研究了在圆光栅系统中光栅黑白比改变,听引起的莫尔信号变化;指出一般的圆光栅副(小间隙、中径处黑白比为1)取样时,在刻划中径附近的区域其信号可用三角波表示,多头读数时的合成信号可以解析得到,合成信号的分析变得便利而直观。莫尔信号多头迭加由计算机编程模拟,频幅分析采用FFT 算法,大大缩短了分析众多参数所需的时间。

In this paper, the change of the black-and-white ratio of the grating in the circular grating system and the change of the moiré signal caused by the hearing are studied. It is pointed out that in the sampling of the general circular grating (the small gap and the black-white ratio at the middle diameter is 1) Its signal can be expressed in triangular wave, the synthesized signal when the multi-head reading can be analyzed, the analysis of the synthesized signal becomes convenient and intuitive. Moore signals are buffered by computer programming simulations, and the amplitude analysis uses FFT algorithms, greatly reducing the time required to analyze numerous parameters.