Calculation
The distance between point A and B is given by
where c is the speed of light in the atmosphere and t is the amount of time for the round-trip between A and B.
where φ is the phase delay made by the light traveling and ω is the angular frequency of optical wave.
Then substituting the values in the equation,
In this equation, λ is the wavelength c/f; Δφ is the part of the phase delay that does not fulfill π (that is, φ modulo π); N is the integer number of wave half-cycles of the round-trip and ΔN the remaining fractional part.
Read more about this topic: Laser Rangefinder
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