THz imaging based on Frequency Domain Spectroscopy

In this paper, preliminary research into Terahertz frequency-domain spectroscopy imaging is presented. Terahertz imaging is mainly based on broadband systems in reflection mode. Resolution is lower, but the data acquisition time is high. In the proposed method, a continuous wave system was utilized. The proposed imaging approach is a hybrid between raster imaging and full-frame imaging. Several overlapping full-frame images were acquired and processed using the proposed image reconstruction. The proposed image reconstruction consists of intensity, phase difference estimation, and Gauss spotlight filter. Experimental results show great promise for further development of the proposed Terahertz imaging approach.