用全息干涉法测量物体表面应变

Measuring the surface strain by holographic interferometry

提出了用全息干涉术测量物体表面应变的一种方法。首先由条纹失量理论计算空间应变场,然后应用投影交换关系来求解表面应变。据此测定了电木圆筒和地质结构模型的表面应变。介绍了条纹矢量理论、投影变换矩阵、表面应变计算公式及实验计算实例。结果表明,这种方法能实现对实验测试数据的快速处理,因而对于处理复杂形体表面的微小应变是方便而有效的。

This paper puts forward a method for measuring object's surface strain by holographic inter ferometry. First.one uses fringe-vector theory to calculate spatial strain field. Then projection transformation is employed to find the surfaec strain. A cording to this method, the surface strains of a thick tube-shaped object and a geologic structure model are measured. Fringe-vector theory, projection trans formation matrix, operational formula and an experimental example arc presented, Experimental results show that the method given in this paper can perform fast-speed data handling and it is convenient and valid for dealing with minute strain of complex object's surface.