An approach to non-contact, fast, and precision measurement of small roll angle using digital shearography is introduced. The roll angles are determined directly by recording the interferometric phase changes when using a dual-beam digital shearography to measure tested surfaces. Phase at a point rather than full-field phase distribution is used to calculate the roll angle, so global image processing is no longer needed and the measurement speed becomes much faster. The proposed approach is robust due to the nature of digital shearography, making it a promising method in field applications. The theoretical measurement resolution of the method is from 1.5 µrad to deep sub-microradian, which can compete with the best resolution of the existing methods.

介绍了一种使用数字剪切成像技术对小滚转角进行非接触式、快速和精确测量的方法。当使用双光束数字剪切成像测量测试表面时，通过记录干涉相位变化直接确定滚动角。滚动角的计算采用点的相位而不是全场的相位分布，因此不再需要全局图像处理，测量速度变得更快。由于数字剪切成像的性质，所提出的方法是稳健的，使其成为现场应用中一种很有前途的方法。该方法的理论测量分辨率为1.5 µrad至深亚微弧度，可与现有方法的最佳分辨率相媲美。