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[DPRG] LASER rangefinder

Subject: [DPRG] LASER rangefinder
From: TomD TomD at austin.rr.com
Date: Sat Jul 5 13:36:20 CDT 2008

Instead of trying to measure time of flight, look into modulating the 
beam at a high frequency
and measuring the phase shift.
The turn on time of the LASER diode and delays in your optical pickup 
are going to make ps accuracy
impossible to measure.

Modern range finders use multiple modulation frequencies, low freq 
(10Mhz) for coarse
and fast measurements and high frequency (250Mhz) for fine , but slow 

Google 'laser rangefinder pll' and start from there.

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