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    <title>超声波传感 on 办公AI智能小助手</title>
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      <title>超声波运动传感技术原理与应用</title>
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      <description>&lt;h2 id=&#34;超声波存在检测原理&#34;&gt;超声波存在检测原理&lt;/h2&gt;&#xA;&lt;p&gt;基于超声波的存在检测（USPD）通过设备内置扬声器发射超声波信号（≥32 kHz），并监测麦克风接收信号的变化来检测运动。超声波传感器主要分为多普勒传感和飞行时间传感两类。&lt;/p&gt;</description>
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