我使用PSoC3实现了接近传感器。用圆形线圈导体（厚度＝1mm，半径＝10cm）实现了17cm的接近范围。有没有更好的射程？
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I implemented a proximity sensor using PSoC3. A proximity range of 17cm was achieved with a circular loop conductor (thickness=1mm, radius=10cm). Anyone got a better range ?
