中文摘要：

阐述了超声散斑相关法测量物体表面应变的原理，组建了实验测量系统，对位于水下的硅橡胶试件的表面应变进行了非接触式测量，测量值与标定值符合较好．对实验误差的分析表明：在加载范围内，应变越大，测量误差越小，且测量误差主要与散斑的横向尺寸有关．针对应变大小对超声散斑退相关效应的影响进行了研究，实验结果表明在测量范围内，这种影响近似成线性变化．

英文摘要：

Principle of the ultrasonic speckle correlation method applied to measure the surface strain of object was introduced. An experimental measurement arrangement was set up, with which the surface strain of a silicone rubber specimen in water was measured in a non-contact way. The experimental data are in good agreement with the calibration ones. The analyses of experimental errors show that within the loading range the larger the strain, the smaller the experimental error is, and the measurement error is mainly related to the average transverse size of the ultrasonic, speckles. The anti- correlation between the ultrasonic speckles and the strain was also studied. It is shown by the experi- ment that there is an approximately linear relationship between them within the loading range.