分分析了测量摩擦焊接头表面法向变形的原理。在光路满足一定的条件下 ,双曝光全息图所再现出的干涉条纹反映了待测件表面法向变形的大小。试验中 ,以调Q红宝石激光器为光源 ,拍摄了摩擦焊接头的双曝光全息图。本文将其全息干涉条纹通过CCD图象采集系统数字化地采集数据 ,通过微机对图象数据进行处理 ,得到了待测件表面法向变形的大小。 Analysis of the principle of measuring the normal deformation of the friction welding surface. Under the condition that the optical path satisfies a certain condition, the interference fringes reproduced by the double exposure hologram reflect the size of the normal deformation of the surface of the test piece. In the experiment, a Q-switched ruby ​​laser was used as a light source, and a double exposure hologram of the friction welding head was taken. In this paper, the holographic interference fringes are collected digitally by CCD image acquisition system. The image data is processed by microcomputer to get the normal deformation of the surface of the test piece.