Patent ID: 11922265
Assignee: INTELLIGENT MATERIAL SOLUTIONS, INC
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 7:
8. A method for authenticating identification cards, comprising:
(a) emitting a first wavelength of near infrared light to be received by a detector with a first signal strength;
(b) determining the presence of a card based on a comparison of the first signal strength and a second signal strength detected by the detector after the card has been inserted, the card comprising an infrared-blocking material capable of blocking a plurality of near infrared wavelengths and a phosphor particle capable of absorbing at least one near-infrared wavelength, wherein a card is considered present if the second signal strength is less than that of the first signal strength;
(c) emitting at least one second wavelength of near infrared light to be at least partially absorbed by the phosphor particle;
(d) receiving at least one third wavelength of near-infrared light at the detector, each of the at least one third wavelengths being emitted by the phosphor particle;
(e) identifying a location on the card of the phosphor particle, and identifying a rise time of the phosphor particle, a decay time of the phosphor particle, or both.