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From: etxbrfa@kklm01.ericsson.se
Newsgroups: sci.electronics,misc.misc,misc.wanted
Subject: Measuring distance using lasers  (followup)
Message-ID: <122@ericom.ericsson.se>
Date: 7 Nov 88 17:21:51 GMT
Sender: news@ericom.ericsson.se
Organization: Ericsson Telecom, Stockholm, Sweden
Lines: 18

It seems as many people out there are interested in laser-rangefinders.
I got lots of answers to my question earlier, and I've done the homework
for this time. Now for todays questions.

If the beam is modulated with a frequency of, say, 10MHz (30 meters), how
can I electronically measure the phase difference between outgoing signal
and reflex. If I use an oscilloscope, it's easy to se how many millimeters
the reflex is from the output and multiplying that with the timebase gives
the time. (And from that ofcource the distance.) But how can this be done
electronically? I suppose the solution is't that difficult, but at least
I don't know how to do it.

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