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Thread: "Lasers again" distance measurement + extreme idea
face BY : David VanHorn email (remove spam text)

>This is what Like Dave VanHorn said:
>         "You simply mix the received light with the transmitted light.
>         Dark means out of phase, bright means in-phase."
>I must agree with him but I agree with you too. You can easily modulate a
>laser light by controlling the current. This allows you to send pulses by
>connecting the laser to a square wave generator and then it's possible to
>compare the phase between the incoming and transmitted pulse.

You can do both I suppose, modulate the beam with one carrier, and phase
detect that to get distance, then use the interference rate to get speed,
during the interval that the beam is on.

Dave's Engineering Page: http://www.dvanhorn.org
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

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Subject (change) "Lasers again" distance measurement + extreme idea

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