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.
