A proximity sensor often emits an electromagnetic or electrostatic field, or a beam of electromagnetic radiation (infrared, for instance), and looks for changes in the field or return signal.
一个接近性传感器通常会发出电磁或静电场，或电磁辐射光束(例如红外)，以及在外地或返回信号的变化看。
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In that case, the array would transmit to the wrong beam, and the user might miss the return signal entirely.