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[DPRG]Wall-E -> 1GHZ computers laser rangefinding
Subject: [DPRG]Wall-E -> 1GHZ computers laser rangefinding
From: John Swindle
swindle at compuserve.com
Date: Wed Jul 9 21:46:20 CDT 2008
Folks:
I think we all like the idea of direct time-of-flight measurement
of light because it seems so straightforward and cool, but as you
probably already know, the laser rangefinders do it with the
phase of the light, not the flight time. Indeed, it can be done
with cheap parts at about 25MHz, not 1GHz. When I was playing
around with rangefinder ideas, I found the plans for the circuit,
but I discarded the link. It didn't take much searching.
When I was in college, I thought I could directly measure the
speed of light using a strobe, a photodetector, and a fast
digitizing oscilloscope. It is considerably harder than it would
seem. I only got a C on that project. Ouch!
Back to my passive sonar stuff now.
John Swindle
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