transmitting sound using laser to 1 mile

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ahmed fathi

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Hello,

I am an engineering student , beginner in electronics , and I wanted to ask :

If I try to make a transmission of sound using laser over 1 mile in the darkness, and about 50 meters in the light , how much would something like that cost , and where to start learning about what to do ?!

to clarify : it is some kind of competition between students , ending in about two weeks , between teams not individuals

thanks in advance
 

If we are to believe the article in the above link, then the kit should be less then £100 UK. The problem I see is actually keeping the laser spot pointing at the target, because at a mile you will not be able to see it , even in the dark from the transmitting end. A large parabolic mirror at the receiving end will give you a bigger target to shoot at, because any temperature differentials down your path will cause the beam to deflect as will any breeze blowing on the transmitter.
I would go for a PWM link, only costs a few £s more and gives you 100 X sensitivity.
Frank
 

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