Abstract-Bifocal dual reflector system for active terahertz imaging

Deliang Zhou, Liwei Hou, Yi Yuan, Yuanzhang Zang, Xuecou Tu, Jian Chen, and Peiheng Wu

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-57-12-3224&origin=search

This paper introduces a method for optimizing the terahertz (THz) imaging resolution in a specified field of view (FoV) for a scanning dual reflector system (Gregory or Cassegrain system) based on the theory of field curvature. The authors built a Gregory scanning system to verify the ability of this method. The operating frequency of the verification system is 220 GHz, the FoV at a specified distance of 8 m is approximately 50 cm * 100 cm, and the imaging resolution throughout the entire FoV is better than 3 cm. Experimental results show that the imaging resolution of the classical dual reflector system can be optimized, and the proposed verification system can realize active THz imaging of the human body.

© 2018 Optical Society of America

Abstract-Practical dual-band terahertz imaging system

Deliang Zhou, Liwei Hou, Wei Xie, Yuanzhang Zang, Bin Lu, Jian Chen, and Peiheng Wu

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-11-3148

This paper introduces a dual-band terahertz imaging system as a potential product for nondestructive testing using heterodyne detectors and continuous-wave sources. The operating frequencies of the system are 110.4 and 220.8 GHz. Multiband fusion technology combines the advantages of the greater spatial resolution of the high-frequency band and the enhanced sensitivity of the low-frequency band to improve the detection ability of the system. Additionally, the interference cancellation technology is used to obtain a superior image quality. The spatial resolution of this system was approximately 3 mm. The results show that the system can be used for bonding quality and embedded defect detection in radomes and foam materials adhered to metal plates in aircrafts.

© 2017 Optical Society of America