A shearography nondestructive testing instrument for composite based on Wollaston prism

Shearography technique has the advantages of full-field noncontact, high precision and high sensitivity, and is widely used in the field of nondestructive detection of composites. For the practical engineering application of composite defect detection, a shearography nondestructive instrument based on a Wollaston prism with compact structure and strong anti-interference ability was proposed, so as to realize real-time dynamic defect detection. The system was used to teste the different types of composite materials. It achieved a detection rate of 97% and can detect defects as small as 2 mm.