A diaphragm is a diaphragm...wiring a speaker up backwards creates a (piss poor) microphone, just as wiring a microphone up backwards creates a (even more piss poor than the other way around) speaker.
Fact:
Yes, shining a laser at something like a window, and measuring its reflected energy, creates a "laser microphone"... This is literally 70's technology...
Fact:
I leaned long ago that you can use headphones as a microphone.
Fact :
The Three letter agencies have laser microphones
Fact:
A diaphragm is a diaphragm...wiring a speaker up backwards creates a (piss poor) microphone, just as wiring a microphone up backwards creates a (even more piss poor than the other way around) speaker.
Fact:
Yes, shining a laser at something like a window, and measuring its reflected energy, creates a "laser microphone"... This is literally 70's technology...
Fact:
We are far, FAR beyond that now....
But... Can you induce vibrations with a laser? Or only measure them?
As far as I’m aware, you could only induce vibrations on something very small, such as a hair or piece of paper.
Just happened to read something where "light waves" have no mass, but do have momentum.... Perhaps that is the mechanism at play here?