Simultaneous measurement of stress-optic constant and stress field of transparent plate by digital holographic interferometry

In this paper, a simultaneous measurement method of stress-optic constant and stress field of transparent plate is presented based on digital holographic interferometry. An image-plane digital holographic system is used to capture holograms and measure phase difference of object wave at different loading states. The relationship among the phase difference, the stress-optic constant and stress of transparent plate is given. The stress-optic constant and stress field of a polymethyl methacrylate (PMMA) specimen with a hole under uniform tensile force are measured by this method. The experimental results are in accordance with the existed and theoretical ones.