|MadSci Network: Physics|
I was thinking about this, and I am wondering if one focused a laser beam on a surface, say a pane of glass would it reveal the vibrations of the medium it hit? The pane of glass or object would vibrate due to the pressure exerted on it, in terms of a voice, this transverse sound wave would impact the glass and make it minutely jiggle, right? If the glass vibrates from the speech in a certain way, this could be picked up by a laser, if what I think is right. Then with a computer and considerable processing power one could de-noise this data and turn it back into speech. If a laser can pick up the vibrations in the medium it hits and carry this information efficiently, this would make for a very effective surveillance microphone. One could "hear" a person talking on a cellphone inside of a car (if the windows were rolled up) from as far away as there was the ability to make a line of site hit of a laser to that car.
Re: Can a laser be used as a long distance microphone?
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