| 摘要 |
Transponder provided with: a receiving circuit for receiving interrogation signals and electromagnetic field energy, energy storage means for storing the received electromagnetic field energy and for delivering power to the transponder, interrogation signal processing means for detecting the interrrogation signal, a measuring circuit coupled to one or more sensors for measuring the value of one or more external ambient parameters, and a transmitting circuit which, after reception of an interrogation signal, transmits the parameter value(s) measured by the measuring circuit. The transponder is furthermore provided with a time-determining circuit which activates the measuring circuit at predetermined times to carry out one or more measurements of the said ambient parameter(s). The measuring circuit is provided with a memory in which a number of measured parameter values can be stored. The energy storage means have sufficient capacity to supply power within a predetermined period to the time-determining circuit in order to keep it in operation during said period and also to supply power to the measuring circuit if it is activated within said period by the time-determining circuit.
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