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电涡流式通道安全检查门(简称安检门)通常有1个发射线圈和6个扁平接收线圈,分布在安检门两侧的上、中、下部位,形成______个探测区。发射线圈的激励源频率为几十______赫。当有导电的金______物体通过接收线圈时,改变了每一个接收线圈的感应电动势相位,从而可以在接收线圈中产生电压差。计算机根据感应电压的差值以及与激励源的______差来判定金属物体的大小和所处的位置。
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