4 ms·

For windows, they already have this, IIUC. You bound a laser beam of the window and measure the vibrations. Random guys can just do this in their garage. https

For windows, they already have this, IIUC. You bound a laser beam of the window and measure the vibrations. Random guys can just do this in their garage. https://www.youtube.com/watch?v=1MrudVza6mo https://www.youtube.com/watch?v=1MrudVza6mo

conistonwater 8y ago
The Applied Science guy is most definitely not a random guy in a garage, though, he's incredibly skilled and talented. The rest of his youtube channel is pretty amazing also.
- Shish2k 8y ago
  I am a random guy in a garage, and I made a functional laser microphone using random bits of electronics I had in my spare-bits box ($1 laser pointer, old pair of earphones, snip off the earphone and wire in a light dependent resistor) -- admittedly the quality was awful (you could only just make out voices if people in the room talked abnormally loud), but it was great for a fun weekend science project :D
  - gugagore 8y ago
    I would imagine an LDR would be too slow to have a good response to audio.
  - samstave 8y ago
    A write-up or vid of the components and build would be interesting..
- deleted 8y ago
  [deleted]
ehsankia 8y ago
You can do it with video too, even: https://www.youtube.com/watch?v=FKXOucXB4a8 https://www.youtube.com/watch?v=FKXOucXB4a8 Also, this is only tangentially related, but you can also see through walls using WiFi: https://www.youtube.com/watch?v=kBFMsY5ZP0o https://www.youtube.com/watch?v=kBFMsY5ZP0o
- ttul 8y ago
  I wonder if this technique has made its way from MIT to the clandestine services yet... you sort of have to assume it has.