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How Motion Sensors Turn on Outdoor Lights
运动传感器如何触发户外灯亮起
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Outdoor lights turn on only when someone walks nearby.室外灯只在有人走近时才会亮起。
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A motion sensor uses infrared waves to detect body heat.运动传感器利用红外波探测人体热量。
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It watches for warm shapes moving across its field of view.它监测视野内移动的温暖物体轮廓。
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When heat moves, the sensor sends a signal to the light circuit.一旦检测到热量移动，传感器便会向照明电路发送信号。
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The light stays on for about 30 seconds after motion stops.运动停止后，灯光会持续亮约30秒。
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This saves energy compared to lights left on all night.相比整夜常亮，这种方式更省电。
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Sensors ignore wind, rain, or small animals most of the time.传感器大多时候会忽略风、雨或小型动物。
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They make yards safer and more convenient after dark.它们让庭院在夜间更安全、更便利。