A Complete Collection of 100000 Whys
Fav十万个为什么
为什么摄像头晚上会有红点？
简单的摘要：摄像头晚上出现红点的原因主要是电源指示灯亮起、红外夜视功能启动以及红外灯的波长特性。
1、电源指示灯亮起：摄像头通电后，电源指示灯会亮起，通常为红色，表示设备处于工作状态。
2、红外夜视功能启动：在低照度环境下，摄像头会自动启动红外夜视功能，红外灯发出红外线用于补光，从而实现夜间监控。
3、红外灯的波长特性：红外灯的波长通常在850nm左右，虽然属于不可见光范围，但由于其波长不纯，部分光线会以红点的形式被肉眼观察到。
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