A W-band auto-focus holographic imaging system for security screening

IEICE Electronics Express

Haitao Zheng¹  Handan Jing¹  Houjun Sun¹  Shiyong Li¹  Hang Cheng¹ 

[1] School of Information and Electronics, Beijing Institute of Technology

关键词: holography;    auto-focus;    millimeter-wave;    imaging;    security screening;   

DOI  :  10.1587/elex.14.20170347

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

Millimeter-wave Holography is a promising technique for security screening to detect concealed weapons. However, a crucial disadvantage of this technique is that the close-range large-aperture operation result in a very short depth of focus. In this paper, a W-band auto-focus holographic imaging system is presented. By calculating and comparing the amplitude integral value of holographic imaging results reconstructed at different focusing distances, the algorithm can assess focusing quality of each imaging result, choose the optimal focusing distance, and extract the optimum viewing image from the imaging results. The scheme of imaging system is described in detail. Both simulation and experimental results are provided to demonstrate that the focusing performance of new auto-focus imaging system is much better than conventional holographic system.

【 授权许可】

CC BY