CPC G08B 13/2425 (2013.01) [G08B 13/246 (2013.01); G08B 13/2411 (2013.01); G08B 13/2417 (2013.01); G08B 13/2448 (2013.01)] | 20 Claims |
1. A method for operating a marker, comprising:
receiving, by an active (radio frequency identification) RFID element, a RFID deactivation signal transmitted from an external device; and
responsive to the RFID deactivation signal, supplying power from the active RFID element to a detuner element so that the detuner element switches from a first state to a second state, the detuner element electrically coupled between the active RFID element and a passive Acousto-Magnetic circuit of the marker,
wherein the active RFID element is separate from the passive Acousto-Magnetic circuit, and a resonant frequency of the passive Acousto-Magnetic circuit is changed to a first value outside of an operating frequency range when the detuner element switches from the first state to the second state.
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