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AB&RACTMillimeter wave holographic imaging systems capable of imaging through clothing to detect contraband, metal, plastic, or ceramic weapons may provide a practical solution to personnel inspection needs in mass transportation centers. TraditiOnal inspection systems, such as metal detectors and x-ray imaging systems, have limitations for the detection of concealed weapons. Metal detectors are limited because they cannot detect plastic weapons and x-ray imaging systems are limited in use due to radiological health considerations. A prototype millimeter wave holographic surveillance system has been developed and demonstrated at the Pacific Northwest Laboratory (PNL). The prototype millimeter wave holographic surveillance system developed at PNL consists of a sequentially switched 2 x 64 elemsnt array coupled to a 35 GHz bi-static transceiver. The sequentially Switched array of antennas can be used to obtain the holographic data at high s by electronically sequencing the antennas along one dimension and performing a mechanical scan along the other dimension. A one-dimensional mechanical scan can be performed in about one second. The prototype system scans an aperture of 0.75 by 2.05 m. This system has been demonstrated and images have been obtained on volunteers at Sea-Tac InternatiOnal airport in Seattle, Washington.

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