| 摘要 |
A system for detecting a condition of a package, the package comprising a sensor responsive to electromagnetic induction and having response characteristics dependent on said condition, the system comprising: an excitation coil magnetically couplable to said sensor; and a receiving coil system magnetically couplable to said sensor, the receiving coil system being connectable to a processing system for determining the sensor response, wherein the receiving coil system is arranged so as to control the electromagnetic coupling between at least part of the receiving coil system and said excitation coil.
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