Method for detecting presence of e.g. radio frequency identification-tag in proximity of reading device used at electronic door lock of tool cabinet to identify goods, involves identifying tag based on time curve of voltage

摘要

The method involves activating electrical oscillator circuits (C, L) at discrete time points and de-activating the electrical oscillator circuits, where the time interval between two consecutive time points is greater than 0.5 seconds and less than 5 seconds. A time curve of electrical voltage is evaluated after de-activating the electrical oscillator circuits, where the electrical voltage is controlled in the electrical oscillator circuits. The presence of a radio frequency identification (RFID)-tag is identified based on the time curve of the electrical voltage. Independent claims are also included for the following: (1) a software program for detecting presence of a radio frequency identification (RFID)-tag and hand-held unit (2) a RFID-reading device for detecting presence of a RFID-tag and hand-held unit.