Abstract
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 220GHz, the FoV at a specified distance of 8m is approximately 50cm * 100cm, and the imaging resolution throughout the entire FoV is better than 3cm. 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.
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