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The Principle Of Laser Rangefinder

The principle of ranging can basically be attributed to measuring the time required for the light to travel to and from the target, and then calculating the distance D by the speed of light c = 299792458 m/s and the atmospheric refractive index n. Because it is more difficult to measure the time directly, it is usually to measure the phase of the continuous wave, which is called a phase measuring range finder. Of course, there are pulse rangefinders.

It should be noted that phase measurement does not measure the phase of the infrared or laser, but instead measures the phase of the signal modulated on the infrared or laser. The construction industry has a hand-held laser range finder for house measurements, which works in the same way.


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