To detect a particular physical condition or change in physical condition (magnetic particle orientation, light transmission through paper) and output an electrical signal that can be used to identify it.

 
  • 检测一种特定的物理状态或在物理状态(磁微粒的取向,通过纸带的光传输)下的变化,并输出能用来辨认该变化的电信号。
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