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MIT- Eerie Lasers That Transmit Whispers Only You Can Hear (Method for…
MIT- Eerie Lasers That Transmit Whispers Only You Can Hear
Laser light to whisper from meter away
Harmless
Localize an audible signal
Intensify soundwaves
1.9 mm thulium laser
Photoacoustic effect
Water vapuor absorbs emission
Then vibrates in audible frequency
Laser wavelength strongly absorbed
Method for transmitting
Laser's amplitude
8 feet away
Jiggling more water particles
Louder audio
Higher fidelity
Disadvantage
It works at a very specific distance from the transmitter
Closer - Too pitched
Further - Below audibility