Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1995-06-01
1996-09-03
Snow, Walter E.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324243, 340551, G01N 2772, G01R 3312, G08B 1324
Patent
active
055527051
ABSTRACT:
A non-obtrusive, non-threatening weapon detection system for discriminating between a concealed weapon and other metal objects. The system is designed for a high probability of detection with a low false alarm rate. When the subject system is in use, a person under surveillance need not be aware that he or she is being monitored nor is the person's privacy invaded. The system includes the use of a magnetic field generator for transmitting low intensity electromagnetic step pulses causing eddy currents to flow in any metal object carried by the person. The eddy currents scatter a signal that is detected by one or more fast response magnetic field sensors. The eddy currents excited in the metal body, which may be called a target, by the leading edges of the transmitted step pulses take the form of an exponentially decaying transient immediately following the step pulses abrupt initial rise. This "decay curve" provides a basic observable, namely, a time constant of the current decay. The decay curve is analyzed by an appropriate means such as a preprogrammed computer, to determine accurately the time constant of the decay curve. The processed information can then be compared with similar values of the time constant contained in a stored data base to predict the nature of the target. The analyzed information allows an observer to identify the target as being threatening or non-threatening.
REFERENCES:
patent: 3707672 (1972-12-01), Miller et al.
patent: 4894619 (1990-01-01), Leinonen et al.
Crabtree Edwin H.
Margolis Donald W.
Pizarro Ramon L.
Snow Walter E.
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