Brent Brown wrote:
> On 15 Apr 2008 at 14:40, Jinx wrote:
>
>   
>>> have 3 or more microphones, piezo's, or other vibration sensors
>>> connected to it. Monitor received analog signals with a fast micro
>>>       
>> The US military have a microphone system called Boomerang for
>> triangulating snipers. I saw it on 60 Minutes not so long ago
>>
>> http://www.gizmag.com/go/4497/
>>
>> http://www.youtube.com/watch?v=dYgsGoAlb1s
>>
>> I don't know if it's precise enough for targets though. Two IR
>> curtains (one vertical, one horizontal) may be better
>>     
>
> Very cool, but not so useful if the first shot hits you or your Boomerang.
>
> Speed of sound in steel is approx 5100m/s, so with a 1m target greatest time 
> differential would be around 200us. Probbaly use a little analog electronics to shape 
> the pulses and trigger timing. For a given target, similar type of rifle and ammunition 
> each time, I think it should be feasible to build something that works repeatably, 
> resolution probably around a cm or two.
>
>   
similar perhaps easier system would be to mount your steel sheet on 4 
strain guages
the difference in their recorded forces will tell you where on the sheet 
you had an impact.

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