--- In Nick Gordon <>
wrote:
> Does anyone know why there are no lasermics for fielduse?
> I know they exist for pointing at windows so you can record a mile
away
> whats being said indoors.
> But I think a laserbeam pointing somewhere inside the mic could
> register a very small object trembling on airdisturbence.
> But I never heard of such a microphone. Why not?
>
> Nick
Lasermics pick up the movement of a window. In these surveillance
applications, the window is very close to the subjects. Therefore,
the distance between the window and the laser mic device (which is
bridged by the laser) will cause no attenuation. So, if you were
able to place a light-reflecting surface (a diaphragm) next to your
subject, it would work in the field too. However, using a laser beam
within a microphone capsule would probably not improve it's
performance.=20
Raimund
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