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 >> >> >> Yeah....miniature 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 >
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