System design of focal plane array based Millimeter-wave Imaging radiometer for concealed weapon detection

In this paper, we developed and experimented of the W-band 1-D focal plane array (FPA) passive imaging radiometer which was called by Millimeter-wave Imaging Radiometer Equipment (MIRAE). This consists of quasi-optics including a dielectric aspheric lens and a metal mirror as a reflector, 30 channels FPA receiver based on the direct conversion type, scanner, image processor and displayer. To get 2-D radiometer image with 1 Hz frame rate, the radiometric 1-D FPA receiver is moved into one direction by the linear scanner. From the experiment results, it is certain that MIRAE system can get enough good outdoor radiometer images to detect concealed metal weapons under clothing in the short range application such as security, comparing with other commercial and competitive passive imaging radiometer systems at W-band.