passive infrared sensor

基本解释

After in-depth structure analysis, a passive infrared sensor ( PIR ) model was presented.
通过对系统的物理结构分析提出了一种被动式红外传感器模型。
The M1031-W also includes an integrated passive infrared sensor for motion detection, a white LED light, and two-way audio support with a built-in microphone and speaker.
M1031-W还包括一个适合移动侦测的集成被动红外传感器，白色LED灯，和支持内置麦克风和扬声器的双向音频。
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The Ceiling Mounted Dual Technology Occupancy Sensor employs both passive infrared (PIR) and ultrasonic technology to accurately detect occupancy and automatically turn on lighting.
吸顶式双鉴移动感应器 - 吸顶式双鉴移动感应器采用了被动红外线和超声波技术，以精确检测移动和自动开启照明。