Re: [AFMUG] OT Project update
Didn’t Mythbusters build an air gun to fire a ping pong ball at supersonic speed? From: AF On Behalf Of Bill Prince Sent: Thursday, April 2, 2020 5:47 PM To: af@af.afmug.com Subject: Re: [AFMUG] OT Project update The well watch sounds like a sudden puff of air. You drop a tube from the unit into the inside of the pipe fitting. From the outside it sounds like a little pop ... pop ... pop. bp On 4/2/2020 3:21 PM, ch...@wbmfg.com <mailto:ch...@wbmfg.com> wrote: It will be interesting to see what the well sounding units use for a ping. From: Cameron Crum Sent: Thursday, April 2, 2020 4:10 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] OT Project update Submarine sonar ping? On Thu, Apr 2, 2020 at 4:51 PM mailto:ch...@wbmfg.com> > wrote: Polyethylene has a sound velocity of propagation of a shear wave about 4x the speed of sound in air. So we have to be careful not to couple any of the strike into the actual pipe itself. That was a surprising discovery. From: Carl Peterson Sent: Thursday, April 2, 2020 3:28 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] OT Project update I would think you would want a strike. Like taking the solenoid from a starter and using that to strike a metal disk. Disc would need appropriate waveguide to interface with conduit. On Thu, Apr 2, 2020 at 3:35 PM mailto:ch...@wbmfg.com> > wrote: I hear it hurts. From: Adam Moffett Sent: Thursday, April 2, 2020 2:33 PM To: af@af.afmug.com <mailto:af@af.afmug.com> Subject: Re: [AFMUG] OT Project update Yeahminiature thunder. On 4/2/2020 4:04 PM, Ken Hohhof wrote: I vaguely remember something from about 30 years ago, where they were using focused ultrasound to break up kidney stones. It looks like the technical term is focused ultrasound lithotripsy. My recollection is they used a high voltage spark for the sound source. High voltage spark sounds like it would be in your wheelhouse. Might not work, but still sounds like fun. From: AF mailto:af-boun...@af.afmug.com On Behalf Of Adam Moffett Sent: Thursday, April 2, 2020 2:45 PM To: af@af.afmug.com <mailto: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 <mailto: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 <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- _ -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com _ -- AF mailing list AF@af.afmug.com <mailto: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
Re: [AFMUG] OT Project update
The well watch sounds like a sudden puff of air. You drop a tube
from the unit into the inside of the pipe fitting. From the
outside it sounds like a little pop ... pop ... pop.
bp
On 4/2/2020 3:21 PM, ch...@wbmfg.com
wrote:
It will be interesting to see what the well sounding
units use for a ping.
From: Cameron
Crum
Sent: Thursday, April 2, 2020 4:10 PM
To: AnimalFarm Microwave Users
Group
Subject: Re: [AFMUG] OT Project update
Submarine sonar ping?
On Thu, Apr 2, 2020 at
4:51 PM <ch...@wbmfg.com>
wrote:
Polyethylene has a sound velocity of
propagation of a shear wave about 4x the speed
of sound in air. So we have to be careful not
to couple any of the strike into the actual pipe
itself. That was a surprising discovery.
From: Carl Peterson
Sent: Thursday, April 2, 2020
3:28 PM
To: AnimalFarm
Microwave Users Group
Subject: Re: [AFMUG] OT Project
update
I would think you would want a
strike. Like taking the solenoid from a
starter and using that to strike a metal
disk. Disc would need appropriate waveguide
to interface with conduit.
On Thu,
Apr 2, 2020 at 3:35 PM <ch...@wbmfg.com>
wrote:
I hear it hurts.
From: Adam
Moffett
Sent: Thursday,
April 2, 2020 2:33 PM
To: af@af.afmug.com
Subject: Re:
[AFMUG] OT Project update
Yeahminiature thunder.
On 4/2/2020 4:04 PM, Ken
Hohhof wrote:
I vaguely
remember something from
about 30 years ago, where
they were using focused
ultrasound to break up
kidney stones. It looks
like the technical term is
focused ultrasound
lithotripsy. My
recollection is they used a
high voltage spark for the
sound source.
High
voltage spark sounds like it
would be in your
wheelhouse. Mi
Re: [AFMUG] OT Project update
It will be interesting to see what the well sounding units use for a ping. From: Cameron Crum Sent: Thursday, April 2, 2020 4:10 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] OT Project update Submarine sonar ping? On Thu, Apr 2, 2020 at 4:51 PM wrote: Polyethylene has a sound velocity of propagation of a shear wave about 4x the speed of sound in air. So we have to be careful not to couple any of the strike into the actual pipe itself. That was a surprising discovery. From: Carl Peterson Sent: Thursday, April 2, 2020 3:28 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] OT Project update I would think you would want a strike. Like taking the solenoid from a starter and using that to strike a metal disk. Disc would need appropriate waveguide to interface with conduit. On Thu, Apr 2, 2020 at 3:35 PM wrote: I hear it hurts. From: Adam Moffett Sent: Thursday, April 2, 2020 2:33 PM To: af@af.afmug.com Subject: Re: [AFMUG] OT Project update Yeahminiature thunder. On 4/2/2020 4:04 PM, Ken Hohhof wrote: I vaguely remember something from about 30 years ago, where they were using focused ultrasound to break up kidney stones. It looks like the technical term is focused ultrasound lithotripsy. My recollection is they used a high voltage spark for the sound source. High voltage spark sounds like it would be in your wheelhouse. Might not work, but still sounds like fun. From: AF mailto:af-boun...@af.afmug.com On Behalf Of Adam Moffett Sent: Thursday, April 2, 2020 2:45 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 -- 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
Re: [AFMUG] OT Project update
Submarine sonar ping? On Thu, Apr 2, 2020 at 4:51 PM wrote: > Polyethylene has a sound velocity of propagation of a shear wave about 4x > the speed of sound in air. So we have to be careful not to couple any of > the strike into the actual pipe itself. That was a surprising discovery. > > *From:* Carl Peterson > *Sent:* Thursday, April 2, 2020 3:28 PM > *To:* AnimalFarm Microwave Users Group > *Subject:* Re: [AFMUG] OT Project update > > I would think you would want a strike. Like taking the solenoid from a > starter and using that to strike a metal disk. Disc would need appropriate > waveguide to interface with conduit. > > On Thu, Apr 2, 2020 at 3:35 PM wrote: > >> I hear it hurts. >> >> *From:* Adam Moffett >> *Sent:* Thursday, April 2, 2020 2:33 PM >> *To:* af@af.afmug.com >> *Subject:* Re: [AFMUG] OT Project update >> >> >> Yeahminiature thunder. >> On 4/2/2020 4:04 PM, Ken Hohhof wrote: >> >> I vaguely remember something from about 30 years ago, where they were >> using focused ultrasound to break up kidney stones. It looks like the >> technical term is focused ultrasound lithotripsy. My recollection is they >> used a high voltage spark for the sound source. >> >> >> >> High voltage spark sounds like it would be in your wheelhouse. Might not >> work, but still sounds like fun. >> >> >> >> >> >> *From:* AF mailto:af-boun...@af.afmug.com *On Behalf Of *Adam Moffett >> *Sent:* Thursday, April 2, 2020 2:45 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 > > -- > 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
Re: [AFMUG] OT Project update
Polyethylene has a sound velocity of propagation of a shear wave about 4x the speed of sound in air. So we have to be careful not to couple any of the strike into the actual pipe itself. That was a surprising discovery. From: Carl Peterson Sent: Thursday, April 2, 2020 3:28 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] OT Project update I would think you would want a strike. Like taking the solenoid from a starter and using that to strike a metal disk. Disc would need appropriate waveguide to interface with conduit. On Thu, Apr 2, 2020 at 3:35 PM wrote: I hear it hurts. From: Adam Moffett Sent: Thursday, April 2, 2020 2:33 PM To: af@af.afmug.com Subject: Re: [AFMUG] OT Project update Yeahminiature thunder. On 4/2/2020 4:04 PM, Ken Hohhof wrote: I vaguely remember something from about 30 years ago, where they were using focused ultrasound to break up kidney stones. It looks like the technical term is focused ultrasound lithotripsy. My recollection is they used a high voltage spark for the sound source. High voltage spark sounds like it would be in your wheelhouse. Might not work, but still sounds like fun. From: AF mailto:af-boun...@af.afmug.com On Behalf Of Adam Moffett Sent: Thursday, April 2, 2020 2:45 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 -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
Re: [AFMUG] OT Project update
I would think you would want a strike. Like taking the solenoid from a starter and using that to strike a metal disk. Disc would need appropriate waveguide to interface with conduit. On Thu, Apr 2, 2020 at 3:35 PM wrote: > I hear it hurts. > > *From:* Adam Moffett > *Sent:* Thursday, April 2, 2020 2:33 PM > *To:* af@af.afmug.com > *Subject:* Re: [AFMUG] OT Project update > > > Yeahminiature thunder. > On 4/2/2020 4:04 PM, Ken Hohhof wrote: > > I vaguely remember something from about 30 years ago, where they were > using focused ultrasound to break up kidney stones. It looks like the > technical term is focused ultrasound lithotripsy. My recollection is they > used a high voltage spark for the sound source. > > > > High voltage spark sounds like it would be in your wheelhouse. Might not > work, but still sounds like fun. > > > > > > *From:* AF mailto:af-boun...@af.afmug.com *On Behalf Of *Adam Moffett > *Sent:* Thursday, April 2, 2020 2:45 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
Re: [AFMUG] OT Project update
I hear it hurts. From: Adam Moffett Sent: Thursday, April 2, 2020 2:33 PM To: af@af.afmug.com Subject: Re: [AFMUG] OT Project update Yeahminiature thunder. On 4/2/2020 4:04 PM, Ken Hohhof wrote: I vaguely remember something from about 30 years ago, where they were using focused ultrasound to break up kidney stones. It looks like the technical term is focused ultrasound lithotripsy. My recollection is they used a high voltage spark for the sound source. High voltage spark sounds like it would be in your wheelhouse. Might not work, but still sounds like fun. From: AF mailto:af-boun...@af.afmug.com On Behalf Of Adam Moffett Sent: Thursday, April 2, 2020 2:45 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
Re: [AFMUG] OT Project update
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 Ahso 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. Ohwhat 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
Re: [AFMUG] OT Project update
Yeahminiature thunder. On 4/2/2020 4:04 PM, Ken Hohhof wrote: I vaguely remember something from about 30 years ago, where they were using focused ultrasound to break up kidney stones. It looks like the technical term is focused ultrasound lithotripsy. My recollection is they used a high voltage spark for the sound source. High voltage spark sounds like it would be in your wheelhouse. Might not work, but still sounds like fun. *From:* AF *On Behalf Of *Adam Moffett *Sent:* Thursday, April 2, 2020 2:45 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 <mailto: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
Re: [AFMUG] OT Project update
I vaguely remember something from about 30 years ago, where they were using focused ultrasound to break up kidney stones. It looks like the technical term is focused ultrasound lithotripsy. My recollection is they used a high voltage spark for the sound source. High voltage spark sounds like it would be in your wheelhouse. Might not work, but still sounds like fun. From: AF On Behalf Of Adam Moffett Sent: Thursday, April 2, 2020 2:45 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 <mailto: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
Re: [AFMUG] OT Project update
Ahso 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. Ohwhat 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
Re: [AFMUG] OT Project update
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
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
[AFMUG] OT Project update
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
