Crime-Fighting Metal Detectors Could Count Stacks of Cash—and Foil Smugglers

The utilization of magnetised inks in currentness already countenance pitch car to verify the authenticity of bank notes . But new enquiry picture that metal sensor at security checkpoint coulddetect and count large wads of notesfrom a distance for catching moon curser .

PhysicistsChristopher Fuller and Antao Chen , from the University of Washington in Seattle , found that ordinary handheld metal detectors were able-bodied to recognize the magnetic ink in a single dollar posting from just over an inch away . And as multiple flyer were stacked , the size of their magnetic field also increased , allow the researchers to not only detect them from a greater space , but also count how many there were .

While the investigator intend to submit their work at an upcomingDefense , Security and Sensingconference , there ’s still a lot of work to be done before detector could be smart enough to find a cache of smuggled bills . At the moment determining the dollar value is impossible since different denomination all use the same amount of magnetic ink . And alloy detectors would have to be vastly better so they could automatically separate the magnetic ink from other sources . [ IOP ScienceviaNew Scientist ]

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