被动式红外传感器是用来检测对象的存在或占用。
PIR Sensors are used to detect the presence or occupancy of an object.
分析介绍了已有的主动和被动式孤岛检测方法。
Traditional passive and active islanding detection methods are discussed in the paper.
对车辙等变形类路面病害，提出了主动式路面车辙深度检测方法和被动式路面车辙深度检测方法。
For deformation distress in pavement such as rut, active and passive pavement rut depth detecting methods are put forward.
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