CIA Laser Listener
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Uploader Comments (GBPPR2)
All Comments (20)
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@GBPPR2 Wow, thanks, I thought they just measured the changes in light intensity or maybe the differences in the time the light lingered in returning.
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It's Snell's Law! OMG - Snellius - your observations - they're being used by spies!
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@2204Alpha 300??? Dude you can build one for like 30 dollars. All you need is a laser pointer and a cadmium photocell
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It should be possible to use a sort of small telescope to pick up the laser from the window and filter out all wavelengths but the relevanty one. Which would be a wavelength not seen by the human eye obviously.
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I'm building one now for a Capstone project for school. Check out the Evil Genius Electronic Gadgets. Circuits schematics and all.
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1:15 he is faping :3
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I thought just the laser beam on the window was enough... is the prism really necessary?
agormanvideos 2 months ago
@agormanvideos
The prism acts as a retroreflector so the returned beam is in line with the transmitted beam. You can then detect the slight phase shifts (audio) in an interferometer setup.
GBPPR2 2 months ago
Does anyone know how to set the audio source (like the cassette player) on the laser beam end itself to make the laser send the sound? Or do i have to use a mirror like everyone else?
pencilman222000 2 months ago
@pencilman222000
You need a circuit to modulate the laser's power supply with the signal you want to send.
GBPPR2 2 months ago
This comment has received too many negative votes show
I built one that doesn't need a prism. I can hear inside a window without being directly across from it.
Not telling how I did it though :)
I'll be producing them for sale soon.
conspiracy777 2 years ago
Replace the laser with a microwave Gunnplexer and it will go through walls....
GBPPR2 2 years ago 2