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How do Laser Range Finders/Meters measure distance?

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Peter_L

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I am trying to find the most effective/accurate method for measuring distance using laser technology.

I am aware of a few methods that are available:

1. Time of flight
2. Multiple frequency phase-shift
3. Interferometry
4. Using triangulation / trigonometry

Which method are current range finders, ie. the PD30 Range Meter (created by HILTI), and other similar range finders, using to measure distance with such accuracy (+ - 1/16")?

Any insight is much appreciated.
 

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