Flatbed scanner image and single ultrasonic rangefinder technique for composite laminates defect detection

Inspection of composite laminates in production line using Ultrasonic C-scan for NDT requires a competent and experience inspector in order to analyze the signal which involve various technical instruction. In this paper, two approaches had been used which are image based approach and signal based approach of ultrasonic C-Scan method for NDT of composite laminate are developed and applied, with the aim to compare and validate both techniques instead of surface defect percentage area. The idea is, to propose an image analysis technique which easy to handle by general worker either the defect percentage area between the image and signal analysis are acceptable range or not. Composite laminates 6 plies which produced in-house with geometry 280 mm length × 80 mm width × 2 mm thickness was drilled to consider as defect area. Then, further analysis was performed using image scanning and processing to calculate the percentage of the defect area before we proceeds to the ultrasonic signal based approach. This research had been successfully done with the maximum and the minimum yield percentage between image processing and ultrasonic signal based approach method are 17.12 percent and 8.52 percent.