首页>
外国专利>
Non-obtrusive weapon detection system and method for discriminating between a concealed weapon and other metal objects
Non-obtrusive weapon detection system and method for discriminating between a concealed weapon and other metal objects
展开▼
机译：用于区分隐藏武器和其他金属物体的非侵入式武器检测系统和方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
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.
展开▼
