[21a-212A-1~10] 3.9 Terahertz technologies

△ [21a-212A-4] Spectroscopic Range Points Migration Method for Auto-focusing Terahertz Imaging

〇Takamaru Matsui¹, Shouhei Kidera¹ (1.UEC)

Keywords:THz imaging, Auto focusing, Signal processing

This paper introduces a new spectroscopic imaging method for terahertz (THz) imaging applications. The inherent problem in the conventional THz imaging system is that the azimuth resolution depends on the penetration range due to the lens based dielectric focusing. This problem is efficiently solved by the synthetic aperture (SA) process assuming wider THz beam. Furthermore, the range points migration (RPM) method has a numerous advantages from the usual SA approaches, in terms of accuracy, resolution or computational cost. Moreover, focusing on the feature of RPM, spectroscopic data can be associated to each reflection point. The finite difference time domain (FDTD) based numerical analysis demonstrates that our method accurately reconstructs object boundary with frequency dependent characteristic.