Patent ID: 6469624
Filing Date: 2002-10-22
Classification: G01V,G06K

Abstract:
A non-obtrusive weapon detection system for detection of and discrimination between a concealed ferromagnetic weapon and other objects, the system comprising:a transmitter for transmitting low intensity electromagnetic step pulses, the step pulses creating a combination of a magnetization field signal and a scattered eddy current signal with a crossover point in the metal object under observation; a receiver for detecting said magnetization field signal, said eddy current signal and said crossover point; and data processing and computing equipment means connected to said receiver, said data processing and computing equipment means digitally processing the combination of said magnetization field signal and said scattered eddy current signal with said crossover point for defining a crossover time constant, the processed information of said crossover time constraint providing an accurate determination of the metallurgical composition of the object under surveillance using appropriate mathematical equations, the processed information allowing an observer to identify objects that are threatening and non-threatening.