Design of quasi-optical system for near-field passive millimeter wave imaging
RAO Lei1, ZHENG Jian2, LI Zhihao2
1. Department of Electronic Engineering, Shanghai Dianji University, Shanghai 201306, China;
2. Department of Criminal Investigation, The Third Research Institute of Ministry of Public Security, Shanghai 200031, China
Abstract：Near-field passive millimeter wave imaging is one kind of the most promising technologies for the safety inspection of concealed weapons. A quasi-optical system of near-field millimeter wave imaging is designed based on geometrical optics and Gaussian beam method. The system uses a pair of planar mirrors to scan the target plane along the vertical and the horizontal direction, respectively. A double refraction lens is used to realize focus imaging of millimeter wave. Meanwhile, it adopts a bolometer working at 3 mm wavelength as a detector to receive millimeter wave radiations. The distance between the target plane and the system is less than 1.5 m, the imaging area is 1.2 m×0.6 m and the spatial resolution is 30 mm. Theoretical analysis and simulation results show that the system has good imaging quality and meets the design index. It can be applied for public inspection in particular for non-contact safety inspection, and adapts to the development of near-field passive millimeter wave imaging system which features light weight, compact volume and high imaging quality.
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2016, Vol. 43 
