Re: designing a laser rangefinder


"erique82" <eric_rsaup@xxxxxxxxx> wrote in message
news:1134615308.012795.45500@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi, i'm wondering if anyone here has ever attempted/successfully
> designed a rangefinder? i'm designing one currently based on phase
> measurement, but i'm just not so sure if it will work out. I greatly
> appreciate ideas and suggestions . My questions are:
> 1. is it ok to use a normal laser pointer as a transmitter? if i do
> need to modulate it, then to what frequency should i modulate it to as
> so an electronic receiver circuit can detect it?

Depends on the distance - how far do you want to go? A mile or so and you
need CO2 - to teh street then maybe HeNe - in the lab then a pointer.

>
You really need to understand Interferometers if you are doing this work.
The better coherence a laser has the more chance of success. You will need a
MM Interfeometer. Also a Bragg Cell probably an RF down-convertor (and
amplifier) and a PLL.

Ing


.

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