Panoramic dual-directional shearography assisted by a bi-mirror

作者：Hanyang Jiang, Yinhang Ma, Meiling Dai, Xiangjun Dai, Fujun Yang, Xiaoyuan He · 发表于：Applied Optics · 年份：2020 · DOI：10.1364/ao.394218 · 被引用次数：11 · 研究领域：Optical measurement and interference techniques、Image Processing Techniques and Applications、Advanced Optical Sensing Technologies

A panoramic dual-directional shearography system is proposed to simultaneously determine out-of-plane deformation derivatives in two directions and globally inspect the object to be tested. A dichroic filter (DF), a 3CCD camera, and dual-wavelength light are used in the proposed shearography configuration. The dual-wavelength light coupled with the corresponding imaging sensors of the 3CCD camera provides independent color signals and shearograms. Through adjustment of the tilted stereo-angle of the DF, which offers a second wavelength-dependent measurement, an additional independent image-shearing can be introduced into the setup. The auxiliary bi-mirror surrounding the object helps to fully illuminate the object surface and capture it in a single shot. Theoretical analysis and experimental results demonstrated the utility of the system.