G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.3
G08B 13/24 (2006.01) G01V 3/10 (2006.01)
Patent
CA 1072653
Abstract of the Disclosure Apparatus and method for detecting the presence, in an inspection area, of a marker tag having preselected properties. Transfer of articles from a protected area can be monitored by coupling a marker tag with each article and by including an inspection area in all transfer paths. In a theft detection system, the coupled marker tag can be removed or made in- operative in some manner for authorized withdrawal of an article from the protected area. The marker tag is comprised of a small, thin strip of magne- tic material. A time-varying magnetic field is provided for interacting with a marker tag located in the inspection area. The magnetic field, which in- cludes components having frequencies f1 and f2, has a time-dependent spatial orientation which permits interaction with a marker tag having an arbitrary orientation in the inspection area. The magnetic field components of fre- quency f2 produce changes in the magnetic properties of the marker tag, resulting in the generation of a signal having components of frequencies f1 ?2f2. When the magnitude and phase of the signal having the component f1 + 2f2 falls within a range of values of magnitude and phase peculiar to the marker tag, an alarm is activated by signal detection apparatus. The restric- ted nature of the signals producing an alarm effectively distinguishes a marker tag from signals produced by other objects in the inspection area.
245781
Auger Robert
Holzinger Carl S.
Purinton Edwin C.
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