| 摘要 |
The invention consists of an elongated three-dimensional transducer (1), whose length is adequate to cover the areas in which the transponder that needs to be read can be placed, it is equipped with suitable means for it to be anchored to the floor, on the ceiling or on the wall near the passage that needs to be controlled, it includes at least two electric coils one of which is the transmitter (Tx) and the other one is the receiver (Rx), the first one is usually homopolar, while the second one is usually multipolar.
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