红外光束 meaning in English

infrared beam

Alarm systems . part 2 : requirements for intruder alarm systems . section three - requirements for infrared - beam interruption dectors in buildings
报警系统.第2部分:闯入者报警系统的要求.第3节:建筑物内红外光束中断探测器的要求
The size of a mobile phone , the instrument emits a weaker form of infrared , or near - infrared , which penetrates the skin on the finger and homes in on the bloodstream
该设备如手机大小，它通过发射出弱的红外或近红外光束，穿透手指的皮肤，追踪血流得到检测数据。