Abstract:Digital and analog design approaches are reviewed for handheld low-cost electronic signal processing boxes for close-up optical detection and identification of phosphor markers for authentication of paper money, legal documents, pharmaceuticals, clothing materials, and military friend and foe identification. For extending the range to longer distances of over a meter (several feet) we propose a novel low-cost handheld lock-in amplifier that uniquely identifies a phosphor at a distance of several feet in a nois… Show more
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