HANDHELD MULTISENSOR CONTRABAND DETECTOR TO IMPROVE INSPECTION OF PERSONNEL AT CHECKPOINTS

摘要

A handheld apparatus for measuring natural microwave electromagnetic radiation emanating from a human body to detect areas of anomalous emissions indicating concealed contraband is disclosed. In a particular embodiment the apparatus includes at least two radiometers directed toward a common viewing plane. Circuitry converts the strength of the microwave emissions into a spatially indexed electrical signal related to the localized intensity of the emanations. The lack of need for highly precise spatial resolution allows the use of a region of the microwave spectrum with an abundance of low cost components. A processing system is configured to analyze the time dependent signal from each radiometer during the scanning of a subject. Additional confirmation sensors that measure the body's acoustical reflection capability and metal content supplement the microwave measurements to provide more robust readings. Methods for determination of the relative position of the anomalous reading and communicating with the operator are discussed.