全息干涉计量法测量微小位移是全息术成熟的应用之一，而数字全息是传统的全息术和数字技术相结合的产物， 是一种较新的获取光学信息的方法. 本文把数字全息技术应用到了现有的光学全息物理实验教学中，采用数字全息比较法对 铝板在微小外力作用下所发生的微小形变量进行测量，通过计算得到所用铝板的杨氏模量; 并与传统光学全息法在相同实验 环境下的测量结果以及所用铝板的给定标准值进行了比较. 实验结果表明，该方法不仅省略了光学全息术中的曝光、化学显 影等湿处理过程，缩短了测量时间，而且减少了外界环境干扰因素对测量结果的影响，提高了测量结果的准确性，由该方法所 得的测量结果与给定标准值的相对误差为3.9%.

The measurement of tiny displacement is one of the applications of holographic interferometry，and the digital holography，which is a combination of the traditional optical holography and the digital technology，is a relatively new method of getting optical information. In this paper，the technology of digital holography is applied to the existing physical experiment teaching of optical holographic，and the tiny displacement variables of aluminum plate which is derived from the effect of external force，is measured by digital holography comparison method. According to the experimental data measured，Young's modulus of aluminum plate is obtained by the calculation formula，then which is compared with the measurement result of traditional optical holography method under the same experimental environment and the given standard values of aluminum plate. The experimental results show that the digital holography comparison method does not only omit the processing procedure in optical holography such as optical exposure and chemical wet treatment etc.，shortens the experimental operation time，but also reduces the influence of external environment factors，improves the accuracy of the measurement result. The relative error between the measurement result acquired by this method and the given standard value is 3.9%.