被动毫米波成像是公共安全检查的一个重要发展方向，目前国内外主要集中在纯反射系统的多元探测成像，以及采用透射形式的阵列探测成像两个领域。本文采用单点探测加扫描的形式，设计完成一套低成本近场被动毫米波成像系统，实现探测距离1.5 m、成像范围1.2 m×1.2 m、空间分辨率优于1.5 cm。该系统可应用于各公共检查场所，实现非接触式安全检查。

Passive millimeter wave imaging is an important application in the field of public security. Recently, researchers have concentrated their efforts on the reflex system with FPA, which involves high costs and increased difficulties in building off-axis paraboloidal mirrors of large enough dimensions. In this article, we present a passive millimeter wave imaging system with one HDPE lens and a single detector, which can produce an image within a range of 1.5 m, with an imaging area of 1.2 m×1.2 m, and having a resolution greater than 1.5 cm. This system can be applied to public security and allows for non-contact safety inspections.