In this paper, a digital shearing speckle interferometer for evaluation of composite materials non destructively is reported. Samples of CFRP and GFRP with dimensions of 6" x 6" 1mm have been used for the study. A variety of defects such as bonding voids, delamination, resin rich, starved regions etc., have been simulated in the samples during fabrication. The characterization of strained regions due to the above defects is presented. The defect profiles thus obtained are compared with results obtained from Ultrasonic C-scan Images.