采用对离面位移敏感的单束激光照明散斑干涉光路，将数字散斑相关法和电子散斑干涉术结合起来测量物体的三维变形。在无参考光时采集一幅物体变形前的散斑图，加入参考光并实现散斑干涉，结合相移技术测量物体离面位移。去掉参考光再采集一幅物体变形后的散斑图。对物体变形前后的散斑图进行散斑相关运算，得到二维面内位移分量，实现三维变形测量。对三点弯曲梁进行了实验，结果表明，该方法可以测量变形场的三个位移分量，具有光路简单、易操作的优点。

Based on an electronic speckle pattern interferometry (ESPI) optical setup with one illuminating light sensitive to out-of-plane displacement, a method is presented for three-dimensional deformation measurement by using the combination of digital speckle correlation method (DSCM) and ESPI. One speckle pattern before deformation is captured by a CCD camera without a reference light. The reference light is used and an ESPI system is constructed. The out-plane displacement component can be measured after the test object is deformed by using phase shifting technique in the ESPI system. Another speckle pattern is captured without reference light after deformation. The in-plane displacement components can be obtained by using DSCM from the two speckle patterns, one obtained before deformation and another after deformation. In this way the measurement of the three-dimensional displacement of an object is completed. A typical three-point-bending beam experiment is carried out by the method proposed. Experimental results show that the three displacement components can be obtained effectively. The deformation measurement system is simple and useful for it has a simple setup and easy operation.