本文用激光全息二次曝光干涉法对环氧树脂光弹性模型的等厚线和等色线及有机玻璃模型的等厚线进行了实验研究。采用的方法是,模型加载前底板曝光一次,记录下模型未变形前的光学信息,然后,模型和底板位置保持不变,进行加载,再曝光一次,把模型受力后的光学信息记录于同一张底板上。经显影定影,两次曝光的光学信息都“冻结”在全 In this paper, laser holographic double exposure interferometry was used to study the isopachy lines and isochromatic lines of the photoelastic models of epoxy resin and the isopachy lines of plexiglass models. The method used is that the model is exposed once before the bottom plate is exposed and the optical information before the deformation of the model is recorded. Then, the position of the model and the bottom plate remains unchanged, loaded and exposed again, and the optical information of the model force is recorded in the same Zhang on the floor. After the development of fixation, the two exposure of optical information are “frozen” in the whole