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| PeterD... |
 Posted: Mon Mar 09, 2009 9:45 am |
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On Sun, 8 Mar 2009 22:07:58 -0400, "Jon" <jon8338 at (no spam) peoplepc.com> wrote:
[quote:c813cc8f90]What is the average speed of a bullet, anyway? This article says about Mach
4.
[/quote:c813cc8f90]
Bullet muzzle velocity varies greatly with the type of gun. Assume
about 1200 FPS for a handgun, twice that for a long gun, but there are
many exceptions, so plan accordingly.
1200 FPS is about 820 MPH. The speed of sound (Mach) is about 760 MPH
at sea level. Just a bit over Mach 1, a long gun would be abou Mach
2.2 or so.
There are no hard and fast constants in what you are doing, and it is
very possible for the sound to take longer to travel to one microphone
than to another one. |
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| Charles... |
| Posted: Sat Mar 14, 2009 5:36 pm |
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"Jon" <jon8338 at (no spam) peoplepc.com> wrote in message
news:z_OdnYmxYrKc5ynUnZ2dnUVZ_guWnZ2d at (no spam) earthlink.com...
[quote:21a1d24eac]I want to feed the signals from 3 microphones that pick up the shock wave
from a gunshot into a computer and calculate their time differences.
I figure 3 ADC's into 3 USB's and the software. I worked the math out,
[/quote:21a1d24eac]
I don't get the need for ADC's. I would think that a trip circuit based on
the impinging edge of the first wavefront is what you need. Three arrivals
(separated in time) should do it. |
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