300 GHz THz walk-through body scanner


  • Chiko Otani RIKEN Center of Advanced Photonics


A 3-D terahertz imaging system for security gate applications by terahertz wave in 275−305 GHz has been developed and experimentally demonstrated to detect concealed objects carried by pedestrians. This system performs 3D measurement by combining depth detection using FM-CW radar, vertical scanning of the detection spot using a 1D high-speed mechanical beam scanner, and horizontal movement of the irradiated area and the detection spot as the pedestrian walks. The high-speed beam scanner consists of an F-Theta telecentric lens and a polygon mirror. It achieves a vertical line scan rate of 142 lines/sec. The spatial resolution was about 10 mm, consistent with the design value, and the depth resolution was about 10 mm, twice the theoretical value estimated from the FM-CW radar principle. The depth-dependent lateral distortion in 3D images, so call telecentricity, measuremed by the body scanner imaging system was also evaluated, as it is important for oblique 3D image of pedestrians. As a result, images with the same magnification were obtained over a range of more than 500 mm of depth of focus. Finally, the detection of concealed objects carried by pedestrians was demonstrated, showing that the system can cope with a pedestrian walking at a 7 km/sec.

About the Speaker

Chiko Otani, RIKEN Center of Advanced Photonics

Chiko Otani is currently the Team Leader of the Terahertz Sensing and Imaging Team at the RIKEN Center of Advanced Photonics (RAP). He obtained his Ph.D. from The University of Tokyo in 1995. He has previously held postdoctoral research positions at the Cosmic Radiation Laboratory and Kawase Laboratory in RIKEN and served as the Group Director of the Terahertz-wave Research Group, RAP, RIKEN from 2013−2019.



Article ID



Invited Presentations



How to Cite

C Otani, 300 GHz THz walk-through body scanner, Proceedings of the Samahang Pisika ng Pilipinas 41, SPP-2023-INV-1B-02 (2023). URL: https://proceedings.spp-online.org/article/view/SPP-2023-INV-1B-02.