正交光栅信号的脉宽调制细分技术  

Fine Dividing Technique of Orthogonal Moire Signal by Pulse Width Modulation

作　　者：曹国荣[1] 曹俊卿[2] 陈家璧[2] 

机构地区：[1]镇江师范专科学校物理系,镇江212003 [2]上海理工大学仪器仪表学院,上海200093

出　　处：《光学仪器》1997年第3期3-10,共8页Optical Instruments

摘　　要：介绍了将正交光栅信号合成近似三角波，再对合成信号进行脉宽调制的细分技术。该方法的细分精度主要决定于原始正交光栅信号的稳定性，一个周期内的非线性误差可由软件修正，整个测量过程的系统误差也可由软件补偿。A new fine dividing technique is presented in this paper, which combines two orthogonal moire signals into a triangular wave and then modulates it using pulse width modulation method. Theoretic analysis and experimental results show that its accuracy depends on the stability of original orthogonal moire signals. The nonlinear error within one periodcan be compensated by means of a software method and so is the systematic error of the whole measurement.

关 键 词：莫尔条纹 幅度合成 脉宽调制 细分 光栅 

分 类 号：TH741.6[机械工程—光学工程]