| Author | Message | ||
     Anonymous |
Would it work to just bounce a laser* off of a mirror (not a really small mirror) - letting raw speech vibrations shake the mirror? [this is as for the sending end] Wait...as for a simple receiver, could you bounce the laser up into a flat piece of black construction paper with a small number (50?) grains of sand**, (perhaps needing a hearing cone to help)? * which could also be sunlight (**The sand thing is what little I remember from a Mr. Wizard episode. -God I wish I could find that.) | ||
| Simon Quellen Field (Sfield) |
Laser eavesdropping (bouncing a laser off of a window to let the vibrations modulate the beam) requires a much more complicated receiver. There are kits you can buy from Information Unlimited, but actually using one to listen in on conversations without permission is illegal. Sunlight on a good day brings over 100 watts of energy per square foot to the earth. Using a one square-foot mirror made of stretched aluminized mylar, you can reflect that sunlight onto a black surface, and modulate it by aiming sound at the mirror. You might then be able to detect the minute sounds made by the sand moving as the black surface expanded and contracted in time with the modulated light. However, a 100 watt laser is a little harder to come by. The Class III lasers you can buy are all limited to 5 milliwatts. They are 20,000 times less powerful than the mirror, and will not move the sand grains. | ||
| justine aquino (Mnado) Senior Member Username: Mnado Post Number: 103 Registered: 12-2005 |
i've tried it its possible,and doesn't require a complicated receiver i placed the photo capacitor inside a cardboard tube and blocked the end so it dark a placed a magnifying glass at the the opening,...and then another cardboard tube and blocked by a filter paper so it would only pick up the strong light(laser)and doesn't pick up much of the disturbing ambient light(maybe sun's rays)and is very effective then for the transmitter a laser inside a cardboard tube blocked at the end,then blocked by a cling wrap(this will make the laser rays shake more than a mirror) then another tube,then a speaker loud enough to make booms then place it underneath the tubei'll be sending pictures when i get mt camera charged.. | ||
| justine aquino (Mnado) Senior Member Username: Mnado Post Number: 104 Registered: 12-2005 |
if there are any questions just ask i'll be willing to answer it,ask only the things related to the topic.. =) or you could just e-mail me |
