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复合孔径与单孔径记录条纹形成基本原理并无区别,仅在频谱面上将光能大大集中于所选择的空间频率处,经滤波即可获得清晰的全场条纹,使得散斑法测位移全场分析成为有实用价值的测试手段。本文给出双孔光阑散斑干涉原理及方法,并将此法应用于断裂力学,测定带内裂纹圆环在集中力作用下的应力强度因子,得到较满意的结果。
There is no difference between the composite aperture and the basic principle of single aperture recording stripe formation. The light energy is concentrated on the selected spatial frequency only on the spectrum plane, and a clear full-field stripe can be obtained by filtering, Field analysis has become a practical means of testing. In this paper, the principle and method of speckle interference of double aperture diaphragm are given, and the method is applied to fracture mechanics to determine the stress intensity factor of the crack ring in the belt under concentrated force. The satisfactory results are obtained.