This paper presents a special infrared optoelectronic instrument for measuring the hot-rolled plate width, which USES the high accuracy linear CCD as the measuring detector.

分析了利用炽热钢板自身发光进行光学成像，采用高精度的线阵CCD作为测量传感器，对热轧中板宽度进行智能测量的专用红外光电仪表。

youdao

The camera works, the team explained, by bouncing lasers off distant objects, and measuring the time it takes for the light to travel back to the detector.

BBC: Long-distance 3D laser camera unveiled by Edinburgh team

By tuning the quantum cascade laser and measuring how much of the infra-red radiation is absorbed on its way to a detector, hazardous gases in between can be identified.

ECONOMIST: Lasers