Development of imaging system using heterodyne interferometer with terahertz waves

点击翻译按钮获取中文摘要

THz imaging techniques to image the internal structure and map the functional state of various targets are promising and desirable diagnostic tools because of their non-invasiveness under adequate incident power of a few mW. The advantages of THz imaging are that THz-wave radiation is non-ionizing and safe, the observed image has submillimeter-scale resolution, and many materials are relatively transparent to THz waves, including paper, plastics, and cardboard. In this research, we propose an imaging system with a heterodyne detection receiver for high sensitivity imaging. For a practical use, we developed a THz CT imaging system using heterodyne detection method. Furthermore, We demonstrated a depth-resolved 3D imaging based on absorption contrast using the tomosynthesis technique, which is similar to computed tomography except that the number of projections is much smaller. We applied the back-projection method suitable for the constructed detection configuration to an image reconstruction. Using the system, we imaged a paper phantom, and reproduced characters written by pencil.