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Compressed Sensing Based Super-Resolution Layer Structure Analysis for Terahertz Time-domain Spectroscopic Imaging System

This paper introduces a super-resolution depth imaging method based on a compressed sensing scheme with reference signal optimization, particular for data obtained out of focus. The inherent problem in the conventional terahertz time-domain spectroscopic (THz-TDS) system is that the depth resolution is considerably degraded due to pulse dispersion at the out-of-focus area. To overcome the above issue, we introduce the compressed sensing (CS) based super-resolution depth imaging, with the appropriate reference signal model. The effectiveness of our method is validated through TDS-THz measured data from double layer structure object.