Development of Image Processing Technology for Shearography Phase Fringe Patterns

Shearography is a high-precision, non-contact optical full-field measurement method that can perform non-destructive testing of composite material components such as delamination, debonding, wrinkles, cracks, and impact damage. It has been widely used in the field of nondestructive testing of aerospace composite materials. Starting from the principle of shearography and phase shift technology, this paper discusses fringe image processing algorithms such as phase fringe pattern filtering and phase unwrapping technologies, and finally introduces the application of deep learning network in shearography.