High Speed Terahertz TDS Scanner for Automatic Detection of Defects

Automatic detection of defects in glass fibre reinforced polymer (GFRP) based on a terahertz time-domain spectroscopy (TDS) system is presented. We measured a GFRP sample with 15 round delaminations of different sizes by means of a TDS reflective scanner. The algorithm acquired a series of C-scans, which were then analysed using two complementary methods - adaptive threshold and Gaussian valley emphasis. 100
^%
of defects were successfully detected.