First I have to find the right energy to launch. I bought one of those well
sounding units Bill has to see how they are doing essentially the same thing.
While I want distance, I also want to see the reflections etc.
From: Adam Moffett
Sent: Thursday, April 2, 2020 1:59 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] OT Project update
Ah....so you want the echoes, but you don't want secondary sounds interfering
with picking up the echoes.
Big tuning fork? Let it ring for 100ms and then stop the vibration. The sound
travels 34m in that 100ms, so your dead zone is about 100 ft. You can probe
100ft with a rod though.
Oh....what about a "launch box"? Get a 100ft of conduit bent into a coil and
connect that to the pipe being tested. Make it long enough that the secondary
noises from your emission source are over before the first real reflection
comes back.
-Adam
On 4/2/2020 3:52 PM, ch...@wbmfg.com wrote:
Acoustical TDR for characterizing conduits. Best to know what it looks like
before you try to blow something through it.
From: Adam Moffett
Sent: Thursday, April 2, 2020 1:44 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] OT Project update
What's this for anyway?
Big sharp noise through a pipe is what I believe you said you wanted.....but
what is the purpose?
I suppose a gunshot sounds sharp in human terms, but it's really rapidly
expanding gasses being released. In hindsight it makes sense that there would
be an initial burst followed by diminishing secondary noises. If that's an
issue, then aren't echoes in the pipe an issue too? I don't see how you would
avoid the echoes.
-Adam
On 4/2/2020 3:37 PM, ch...@wbmfg.com wrote:
Walther handgun will not fire power hammer loads. Does not seem to strike
the rim at all.
But a 1908 Savage rifle will.
Seems gunshots are not a sharp impulse. Just a burst of noise I have
discovered. No where near a perfect impulse.
So having fun and probably scaring people driving up the highway but on a
quest for a high quality shock wave/sound impulse.
Recording engineers use balloons and clappers.
I have a high power speaker driver coming. Going to see what happens when
I get close to blowing it out with a capacitor discharge.
------------------------------------------------------------------------------
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
--------------------------------------------------------------------------------
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
