摘要
介绍了一种相位移数字云纹变形测量系统．测试系统采用ＣＣＤ摄像系统记录光栅图像，控制采样的空间频率大约为光栅线密度的整数倍，对试件栅进行采样后用数字信号处理的方法，实现空间相位移及进行实时数字云纹条纹显示。
A new deformation measurement technique with digital moire methods is presented. The image of a grating bonded onto a body under exa min ation is acquired with a CCD camera. The sample frequency is chosen as the times of grating density. Then, a special phase shifting method is realized by using digital signal processing technique. The influence of phase shift error and high harmonics in grating signal is automatically corrected.
出处
《力学学报》
EI
CSCD
北大核心
1997年第3期380-384,共5页
Chinese Journal of Theoretical and Applied Mechanics
基金
上海市自然科学基金
国家留学回国人员基金
