Estimation of thickness and width of void under concrete slab using radar image processing

presence of voids under concrete slabs (such as pavements) or behind tunnel linings results in deterioration. One method of detecting such voids by non-destructive means is radar. This search is devoted to easily evaluating the efficiency of such non-destructive tests with radar. As foundation to this ongoing research, which aims to detect only voids and estimate the cross-sectional size (thickness and width) of voids using radar, a new method based on radar image processing is carried out with various void sizes and depths. The regression relationship between void size (thickness and width) which has different depth and amplitude characteristics of the radar return is considered in a new method of this research or the purpose of examining this regression relationship, experiments with change of void depth, surface area and thickness were carried out. Finally, the threshold value for image processing which aims to represent only voids to be fitted size (width) can be obtained is a result, a proposed method in this study has a possibility of detecting only voids and stimulating void size (thickness and width) with good accuracy.