提出了一种利用载频电子散斑干涉测量三维位移场的新技术。首先，设计了一种新型的大错位方棱镜，利用该方棱镜可实现大错位电子散斑干涉。其次，被测物和参考物由布置在水平和竖直位置上的3个激光光源分别照明，三维电子散斑干涉系统由3个激光器、大错位方棱镜、CCD和参考物面组成。参考物面的一次偏转可同时引入3个干涉场的载波条纹。分别采集3个激光器照明下物体形变前后及参考物面偏转后的散斑干涉图样，图像相减后得到不同照明条件下的载波条纹和受形变调制的载波条纹。结合傅里叶变换方法，可解调出形变场的相位，进一步计算得到3个位移分量。利用该三维测量系统对三点弯曲梁进行了典型实验，实验结果表明，该系统可以有效的同时测量形变场的3个位移分量。具有光路简单，操作相对简单的优点，为电子散斑干涉三维测量提供了新的途径。

A technique with carrier modulation for three-dimensional displacement measurement by using electronic speckle pattern interferometry (ESPI) is presented. Firstly, a new block prism, named large-shearing block prism, is designed. A large-shearing electronic speckle pattern interferometer can be constituted when large-shearing block prism is used. Secondly, the test object and reference object are illuminated separately by three lasers which are fixed on horizontal and perpendicular position. A new three-dimensional (3D) ESPI system is constructed by three lasers, a large-shearing block prism and a CCD camera as well as a reference object. The carrier fringes in three interference fields can be introduced by rotating the reference object with a small angle. Interference speckle patterns before and after deformation, and interference speckle patterns after rotation of reference surface are collected when three lasers are used respectively. After the images are subtracted, three carrier fringe patterns and three modulated carrier fringe patterns under different illumination are obtained. Finally, three phase maps can be demodulated by using Fourier transform. Further phase calculation is needed to separate three displacement components. A typical three-point-bending-beam experiment is completed by the 3D system presented. Experimental results are offered, which show that three displacement components can be determined effectively. The 3D system has simple optical setup and has an easy way to operate, therefore it provides a new approach to three-dimensional deformation measurement.