Gui development for defect visualization of composite structures based on terahertz wave

In this paper, we introduce the nondestructive inspection technique of composite materials using terahertz wave, which has been attracting much attention. The limitations of defect visualization results using commercial software are discussed. In this study, a terahertz time domain spectroscopy system based on photo conductivity antenna was hired to detect the internal defects of composites, and hidden multi delamination, a type of composite defect, was simulated in the GFRP composite specimen using Teflon film. In addition, the defect inspection was performed by attaching a plastic card to the CFRP plate with silicon tapes. The terahertz waveform was measured in the time domain using the raster scan method to visualize defects, and the terahertz signal in both the time domain and the frequency domain was analyzed. The MATLAB-based GUI was built to enable the user to easily analyze the acquired terahertz signal in A-scan, B-scan, and C-scan functions and, thereafter, to export the data.