Microphones are overwhelmed by the muzzle blast. Or they are
with our avalanche guns. We found we could hear the breach work,
hear it recoil, even tell when the round hit, but the actual
point where it exited the muzzle was always referred to as "somewhere in
this bit" of the recording. We actually were
able to hear the impacts on a 3km shoot. Mind you we shoot 4lb
mortar like rounds so they tend to go smack nice.

Dave


> On Sat, Jul 22, 2006 at 09:12:11PM -0400, CSB wrote:
> >
> > Microphone= to 'listen' when the bullet goes past? Hmmm....
> Could work. What
> > if I mounted a small microphone at the end of a small tube,
> perpendicular
> > to the projectile's path? Then amplify the signal and 'listen'
> for a variation.
> > If the mic is at 0.05 m from the source, it would take about
> 145 us for the
> > sound wave to propagate... It could be a problem with very
> high-speed shots,
> > though I don't expect them to be supersonic!
>
> I don't know how well a microphone will register the passage of a
> projectile, but what I had in mind was to place the microphone next to the
> muzzle. The report caused by the bullet and exhaust gases exiting
> the barrel
> is what the microphone responds to. I want to think that this is
> the type of
> setup that has been used by high-speed photography of bullets...
>
> Matthew
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