红外线测距或激光测距的原理
测距原理基本可以归结为测量光往返目标所需要时间，然后通过光速c =299792458m/s 和大气折射系数n 计算出距离D。
按照测距方法分为相位法测距仪和脉冲法测距仪，脉冲式激光测距仪是在工作时向目标射出一束或一序列短暂的脉冲激光束，由光电元件接收目标反射的激光束，计时器测定激光束从发射到接收的时间，计算出从观测者到目标的距离。
The principle of infrared ranging or laser ranging
The ranging principle can be basically boiled down to measuring the time it takes for light to travel to and from the target, and then calculating the distance D from the speed of light c = 299792458 m/s and the atmospheric refractive coefficient n.
According to the ranging method, it is divided into phase method rangefinder and pulse method rangefinder, pulsed laser rangefinder is to shoot a beam or a sequence of short-term pulse laser beams to the target when working, the laser beam reflected by the target is received by the optoelectronic element, and the timer measures the time of the laser beam from transmission to reception, and calculates the distance from the observer to the target.
