Patent ID: 8931690
Filing Date: 2015-01-13
Classification: G01S,G06K,G07B,G07C

Abstract:
1. A method of focusing a laser beam to a receiver region, the method comprising: providing an RFID receiver configured to receive an initialization event information containing signal relating to an RFID device when the RFID device is within a detectable distance from the RFID receiver, wherein the detectable distance from the RFID receiver defines an RFID scanning region; positioning a laser scanning system a known distance from the RFID receiver such that the laser scanning system can scan the RFID scanning region; determining the RFID device's distance from said receiver based on the received initialization event information containing signal relating to the RFID device; logging a transaction associated with the RFID device; activating the laser scanning system, wherein the laser scanning system comprises a laser and a light detector; scanning the RFID scanning region with the laser scanning system, wherein the scanning comprises illuminating the RFID scanning region with the laser; detecting a spectral property of the illumination reflected from a surface of the RFID device; generating a value representing the spectral property of the illumination reflected from the surface of the RFID device; and identifying a type of substance on a surface of the RFID device by the spectral property of the illumination reflected from the surface, the spectral property comprising magnitude and frequency of the illumination reflected.