Millimeter Wave SAR Imaging for the Non-Destructive Testing of 3D-printed Samples

This paper provides a method for the non-destructive testing (NDT) of 3D printed samples, based on synthetic aperture radar (SAR) imaging. The 3D-printed technology has gained a wide popularity and importance as it contributes in different applications. The dependency on this technology nowadays leads to proposing different methods for safely testing the 3D samples. In this research, the NDT has been achieved by using microwave imaging. The tested sample has been placed on a positioning table which has been used to achieve a rectangular-scan mode for the SAR imaging. The gathered SAR measurements have been processed by the matched filter technique for image formation. The obtained SAR images of the sample inner structure have been investigated to determine any possible defects within the structure. The algorithm has been used to test a sample with a pre-designed inner defect, and the obtained SAR images show a high precision in detecting the inner defect.