Author(s): Xu Sheng-zhi, Huang Chun-lin, Liu Tao, Qin Yao, Lu Min
Pages: 2742-2748
Year: 2015 Issue:  11
Journal: Journal of Electronics & Information Technology
Keyword:  Continuous wave subsurface penetrating radar; Interference fringes; Nondestructive detection; Cylindrical subsurface detection;
Abstract: The interference fringe phenomenon appears when continuous wave subsurface penetrating radar is used to image on the uneven surfaces for nondestructive detection. As one of the main disturbances, the fringes will deteriorate the imaging results. The principle of this phenomenon is briefly studied and a filtering method to remove the fringes based on the distribution difference in frequency domain between cylindrical surfaces and target is proposed. Besides, according to the regular angle distribution of small target in frequency domain, a compensatory method by interpolation in a certain angle is studied to optimize the imaging results.Moreover, an effective imaging process for cylindrical subsurface detection based on the wavefront imaging algorithm is illustrated. The numerical and experimental data validate the applicability of proposed method and the results outperform the traditional approach of average subtraction.