On a sunny day (Tue, 24 Nov 2015 11:09:52 -0600) it happened amdx <nojunk@knology.net> wrote in <n325gu$ll1$1@dont-email.me>:>On 11/24/2015 8:59 AM, Jan Panteltje wrote: >> On a sunny day (Tue, 24 Nov 2015 08:37:22 -0600) it happened amdx >> <nojunk@knology.net> wrote in <n31sj0$g82$1@dont-email.me>: >> >>> On 11/24/2015 6:25 AM, Jan Panteltje wrote: >>> >>>> >>>> I came across this video: >>>> https://www.youtube.com/watch?v=LWO93G-zLZ0 >>> >>> RE; sonoluminescence >>> >>> Back about 15 years ago I worked at a company building High power High >>> frequency ultrasonic amps and transducers. >>> >>> Our basic unit had a 2" piezo ceramic transducer and was driven at >>> 660kHz with up to 1000 watts. >>> >>> We could set it in a 20" aquarium filled with water. Dark adjust our >>> eyes and when powered up, we could see a 2" sonoluminescent beam from >>> the transducer hit the glass 20" away the reflect back to the other side >>> of the aquarium. >>> We had the transducer at a slight angle so it would reflect off the wall >>> at an angle. >>> >>> This was multibubble luminescence, This was supposed to be the >>> advantage of our high frequency system, the thousands and thousands of >>> bubble collapses were able to enhance the *reaction. >>> When we used a focused reflector, you could see a white fuzzy area in >>> the foci and hear a hiss from the ball of cavitation. >>> >>> * I guess we never found the proper reaction to enhance, as the company >>> is no longer in business. :-) I miss it. >>> Our claim to fame was selling a 4000 watt unit to CalTech. >>> It had a 1 gallon flow through vessel with four--4 inch x 4 inch >>> transducers. >>> >>> Mikek >> >> That is good to know. >> I want to do a simple experiment with the transducer end (40 kHz) itself a bit under water. >> >> | [] | glass vessel. >> |~~~/\~~~ | >> | | >[ ]- -Sony starlight camera >> | | >> --------- (not to scale) >> >> >> And I want to do this remote, from an other room, and wit hear plugs, >> as I do not want to listen to that high pitch noise for an other few days.... >> I did a hearing test (frequency response) on both ears after this, still seems to work, but why take the risk. >> Still waiting for the big transformer cores so I can put the final thing together, >> nice waterproof housing and connectors did arrive. >> >> That guy in the video works through the glass, dunno why... Coupling with hotglue, seems compicatiatiated to me.... >> >> Now I have to read up on neutron detectors I guess.. >> > > Do you just want to see the sonoluminescence or do you want to trap a >single bubble?I would not know how to get one bubble at this point, think I just want to see them bubbles glow for a start.> Ya, I would think the hot glue would be lossy. > On our lab system we isolated the transducer face from the solution >under test with a thin 0.003" clear FEP Teflon sheet. > The transducer was in ice water while the solution under treatment was >at any desired temperature. > > BTW, we had one customer replace the FEP Teflon to PTFE Teflon, during >experiments, and lost his kill rate. He was killing pathogens in milk. > > Hey, I pulled a picture of the setup from the Wayback Machine. >> https://web.archive.org/web/20070222075632/http://www.ultrasonic-energy.com/setup.jpg > >In it you will see the transducer, a gap for the cooling water, then the >flanges pinching the Teflon window, the RED solution under test and then >an air cavity formed with the aluminum cup over the concaved glass end >for focusing the ultrasound. > (the brick wrapped in black duct tape was just to hold the vessel in >position for the picture) > Glass/water interface does not reflect ultrasound like a glass/air >interface. > > MikekStormy waters! Interesting, yes a focusing mirror, will see if I can find something, I see the mass of that thing is smaller than the 40 kHz metal blocks I have, possibly causing the higher resonance. Is the light coming from the bubbles at the surface?
Steel melter for forty bucks? Needs a KW dc supply. Also $1 100nS 30KV! Also ALSO!
Started by ●November 21, 2015
Reply by ●November 24, 20152015-11-24
Reply by ●November 24, 20152015-11-24
On 11/24/2015 12:23 PM, Jan Panteltje wrote:> On a sunny day (Tue, 24 Nov 2015 11:09:52 -0600) it happened amdx > <nojunk@knology.net> wrote in <n325gu$ll1$1@dont-email.me>: > >> On 11/24/2015 8:59 AM, Jan Panteltje wrote: >>> On a sunny day (Tue, 24 Nov 2015 08:37:22 -0600) it happened amdx >>> <nojunk@knology.net> wrote in <n31sj0$g82$1@dont-email.me>: >>> >>>> On 11/24/2015 6:25 AM, Jan Panteltje wrote: >>>> >>>>> >>>>> I came across this video: >>>>> https://www.youtube.com/watch?v=LWO93G-zLZ0 >>>> >>>> RE; sonoluminescence >>>> >>>> Back about 15 years ago I worked at a company building High power High >>>> frequency ultrasonic amps and transducers. >>>> >>>> Our basic unit had a 2" piezo ceramic transducer and was driven at >>>> 660kHz with up to 1000 watts. >>>> >>>> We could set it in a 20" aquarium filled with water. Dark adjust our >>>> eyes and when powered up, we could see a 2" sonoluminescent beam from >>>> the transducer hit the glass 20" away the reflect back to the other side >>>> of the aquarium. >>>> We had the transducer at a slight angle so it would reflect off the wall >>>> at an angle. >>>> >>>> This was multibubble luminescence, This was supposed to be the >>>> advantage of our high frequency system, the thousands and thousands of >>>> bubble collapses were able to enhance the *reaction. >>>> When we used a focused reflector, you could see a white fuzzy area in >>>> the foci and hear a hiss from the ball of cavitation. >>>> >>>> * I guess we never found the proper reaction to enhance, as the company >>>> is no longer in business. :-) I miss it. >>>> Our claim to fame was selling a 4000 watt unit to CalTech. >>>> It had a 1 gallon flow through vessel with four--4 inch x 4 inch >>>> transducers. >>>> >>>> Mikek >>> >>> That is good to know. >>> I want to do a simple experiment with the transducer end (40 kHz) itself a bit under water. >>> >>> | [] | glass vessel. >>> |~~~/\~~~ | >>> | | >[ ]- -Sony starlight camera >>> | | >>> --------- (not to scale) >>> >>> >>> And I want to do this remote, from an other room, and wit hear plugs, >>> as I do not want to listen to that high pitch noise for an other few days.... >>> I did a hearing test (frequency response) on both ears after this, still seems to work, but why take the risk. >>> Still waiting for the big transformer cores so I can put the final thing together, >>> nice waterproof housing and connectors did arrive. >>> >>> That guy in the video works through the glass, dunno why... Coupling with hotglue, seems compicatiatiated to me.... >>> >>> Now I have to read up on neutron detectors I guess.. >>> >> >> Do you just want to see the sonoluminescence or do you want to trap a >> single bubble? > > I would not know how to get one bubble at this point, > think I just want to see them bubbles glow for a start. > > >> Ya, I would think the hot glue would be lossy. >> On our lab system we isolated the transducer face from the solution >> under test with a thin 0.003" clear FEP Teflon sheet. >> The transducer was in ice water while the solution under treatment was >> at any desired temperature. >> >> BTW, we had one customer replace the FEP Teflon to PTFE Teflon, during >> experiments, and lost his kill rate. He was killing pathogens in milk. >> >> Hey, I pulled a picture of the setup from the Wayback Machine. >>> https://web.archive.org/web/20070222075632/http://www.ultrasonic-energy.com/setup.jpg >> >> In it you will see the transducer, a gap for the cooling water, then the >> flanges pinching the Teflon window, the RED solution under test and then >> an air cavity formed with the aluminum cup over the concaved glass end >> for focusing the ultrasound. >> (the brick wrapped in black duct tape was just to hold the vessel in >> position for the picture) >> Glass/water interface does not reflect ultrasound like a glass/air >> interface. >> >> Mikek > > Stormy waters! > Interesting, yes a focusing mirror, will see if I can find something,I don't know what is important at 40kHz, At 660kHz, a thin aluminum concaved reflector backed my air. Somethings are coming back to me. If you drive a 40kHz transducer hard enough, you will get cavitation at the surface of the transducer, this will attenuate how much sound will get out into solution. It is blocked by the cavitation. Here on page 28 is a graph of frequency and pressure required to cause cavitation. At 620kHz we could get much more energy into solution before cavitating the face of the transducer. http://tinyurl.com/npc9v4h> I see the mass of that thing is smaller than the 40 kHz metal blocks I have,Actually the housing is 4" in diameter and the piezo ceramic is 2". I 'think' the 2" piezo was 0.080" thick and we bonded it to 0.0625" 6061 aluminum. This combination was resonant at around 620kHz.> possibly causing the higher resonance.Yes, I mentioned our systems were high frequency, usually about 620kHz. Many, many, tiny bubbles. This picture show a little about cavitation and frequency, also temp and surface tension reduction of your water.> http://www.ctgclean.com/blog/wp-content/uploads/dw-fig06.jpg> Is the light coming from the bubbles at the surface?I'm not sure If I understand the question, Surface of the transducer? As I mentioned the light could be seen all the way across the 20 inches of aquarium and then reflect back again. The sonoluminescence pretty much started at the surface of the transducer, but it was important not to have a lot of cavitation on the surface of the transducer, it would eat the aluminum. I worked with a Physicist that studied acoustics, he designed all of the transducers, amplifiers, driving networks, I just built them. Wish now I had got one for myself just to play with. He considered this one of his better books.> http://www.amazon.com/Sonics-T-F-Bolt-Hueter/dp/0471419761Contents> http://asa.aip.org/books/sonics.htmlThis book looks interesting,> http://tinyurl.com/qafp7hl'Sounds' like fun! Mike
Reply by ●November 24, 20152015-11-24
On a sunny day (Tue, 24 Nov 2015 13:53:20 -0600) it happened amdx <nojunk@knology.net> wrote in <n32f3e$ura$1@dont-email.me>:>On 11/24/2015 12:23 PM, Jan Panteltje wrote: >> On a sunny day (Tue, 24 Nov 2015 11:09:52 -0600) it happened amdx >> <nojunk@knology.net> wrote in <n325gu$ll1$1@dont-email.me>: >> >>> On 11/24/2015 8:59 AM, Jan Panteltje wrote: >>>> On a sunny day (Tue, 24 Nov 2015 08:37:22 -0600) it happened amdx >>>> <nojunk@knology.net> wrote in <n31sj0$g82$1@dont-email.me>: >>>> >>>>> On 11/24/2015 6:25 AM, Jan Panteltje wrote: >>>>> >>>>>> >>>>>> I came across this video: >>>>>> https://www.youtube.com/watch?v=LWO93G-zLZ0 >>>>> >>>>> RE; sonoluminescence >>>>> >>>>> Back about 15 years ago I worked at a company building High power High >>>>> frequency ultrasonic amps and transducers. >>>>> >>>>> Our basic unit had a 2" piezo ceramic transducer and was driven at >>>>> 660kHz with up to 1000 watts. >>>>> >>>>> We could set it in a 20" aquarium filled with water. Dark adjust our >>>>> eyes and when powered up, we could see a 2" sonoluminescent beam from >>>>> the transducer hit the glass 20" away the reflect back to the other side >>>>> of the aquarium. >>>>> We had the transducer at a slight angle so it would reflect off the wall >>>>> at an angle. >>>>> >>>>> This was multibubble luminescence, This was supposed to be the >>>>> advantage of our high frequency system, the thousands and thousands of >>>>> bubble collapses were able to enhance the *reaction. >>>>> When we used a focused reflector, you could see a white fuzzy area in >>>>> the foci and hear a hiss from the ball of cavitation. >>>>> >>>>> * I guess we never found the proper reaction to enhance, as the company >>>>> is no longer in business. :-) I miss it. >>>>> Our claim to fame was selling a 4000 watt unit to CalTech. >>>>> It had a 1 gallon flow through vessel with four--4 inch x 4 inch >>>>> transducers. >>>>> >>>>> Mikek >>>> >>>> That is good to know. >>>> I want to do a simple experiment with the transducer end (40 kHz) itself a bit under water. >>>> >>>> | [] | glass vessel. >>>> |~~~/\~~~ | >>>> | | >[ ]- -Sony starlight camera >>>> | | >>>> --------- (not to scale) >>>> >>>> >>>> And I want to do this remote, from an other room, and wit hear plugs, >>>> as I do not want to listen to that high pitch noise for an other few days.... >>>> I did a hearing test (frequency response) on both ears after this, still seems to work, but why take the risk. >>>> Still waiting for the big transformer cores so I can put the final thing together, >>>> nice waterproof housing and connectors did arrive. >>>> >>>> That guy in the video works through the glass, dunno why... Coupling with hotglue, seems compicatiatiated to me.... >>>> >>>> Now I have to read up on neutron detectors I guess.. >>>> >>> >>> Do you just want to see the sonoluminescence or do you want to trap a >>> single bubble? >> >> I would not know how to get one bubble at this point, >> think I just want to see them bubbles glow for a start. >> >> >>> Ya, I would think the hot glue would be lossy. >>> On our lab system we isolated the transducer face from the solution >>> under test with a thin 0.003" clear FEP Teflon sheet. >>> The transducer was in ice water while the solution under treatment was >>> at any desired temperature. >>> >>> BTW, we had one customer replace the FEP Teflon to PTFE Teflon, during >>> experiments, and lost his kill rate. He was killing pathogens in milk. >>> >>> Hey, I pulled a picture of the setup from the Wayback Machine. >>>> https://web.archive.org/web/20070222075632/http://www.ultrasonic-energy.com/setup.jpg >>> >>> In it you will see the transducer, a gap for the cooling water, then the >>> flanges pinching the Teflon window, the RED solution under test and then >>> an air cavity formed with the aluminum cup over the concaved glass end >>> for focusing the ultrasound. >>> (the brick wrapped in black duct tape was just to hold the vessel in >>> position for the picture) >>> Glass/water interface does not reflect ultrasound like a glass/air >>> interface. >>> >>> Mikek >> >> Stormy waters! >> Interesting, yes a focusing mirror, will see if I can find something, > >I don't know what is important at 40kHz, >At 660kHz, a thin aluminum concaved reflector backed my air.Yes, wavelength is a problem, the longer wavelength at 40 kHz may need a bigger parabolic reflector. Speed of sound in water is 1480 meter / second, at 40 kHz that gives a wavelength of 3.7 cm? This requires a large (several wavelength) reflector.> Somethings are coming back to me. >If you drive a 40kHz transducer hard enough, you will get cavitation at >the surface of the transducer, this will attenuate how much sound will >get out into solution. It is blocked by the cavitation. > >Here on page 28 is a graph of frequency and pressure required to cause >cavitation. At 620kHz we could get much more energy into solution before > >cavitating the face of the transducer.OK> http://tinyurl.com/npc9v4h > > >> I see the mass of that thing is smaller than the 40 kHz metal blocks I have, > > >Actually the housing is 4" in diameter and the piezo ceramic is 2". >I 'think' the 2" piezo was 0.080" thick and we bonded it to 0.0625" 6061 >aluminum. This combination was resonant at around 620kHz. > > >> possibly causing the higher resonance. > > Yes, I mentioned our systems were high frequency, usually about 620kHz. >Many, many, tiny bubbles. > > > >This picture show a little about cavitation and frequency, also temp and >surface tension reduction of your water. >> http://www.ctgclean.com/blog/wp-content/uploads/dw-fig06.jpg > > >> Is the light coming from the bubbles at the surface? > > I'm not sure If I understand the question, >Surface of the transducer? >As I mentioned the light could be seen >all the way across the 20 inches of aquarium and then reflect back again.I ment the surface-to air bubbles, but OK, everywhere is good enough for now :-)> The sonoluminescence pretty much started at the surface of the >transducer, but it was important not to have a lot of cavitation on the >surface of the transducer, it would eat the aluminum.Well, I am not going to run it 24/7 for sure, but will try to make a movie of the lights. So a litttle bit of surface damage to that transducer can be easily polished away I think.> I worked with a Physicist that studied acoustics, he designed all of >the transducers, amplifiers, driving networks, I just built them. >Wish now I had got one for myself just to play with.Nobody is stopping you to get one from ebay, 13 $ or so.>He considered this one of his better books. >> http://www.amazon.com/Sonics-T-F-Bolt-Hueter/dp/0471419761 > >Contents >> http://asa.aip.org/books/sonics.html > > This book looks interesting, >> http://tinyurl.com/qafp7hl > >'Sounds' like fun! > > MikeIt is a lot of study material, lemme build a model in my neural net when experimenting.
Reply by ●November 24, 20152015-11-24
On 11/24/2015 2:47 PM, Jan Panteltje wrote:> On a sunny day (Tue, 24 Nov 2015 13:53:20 -0600) it happened amdx>> >>> Is the light coming from the bubbles at the surface? >> >> I'm not sure If I understand the question, >> Surface of the transducer? >> As I mentioned the light could be seen >> all the way across the 20 inches of aquarium and then reflect back again. > > > I meant the surface-to air bubbles, but OK, > everywhere is good enough for now :-)The sonoluminesence follows the 2" diameter of the 2" (round) transducer. Just a tube of light.>> The sonoluminescence pretty much started at the surface of the >> transducer, but it was important not to have a lot of cavitation on the >> surface of the transducer, it would eat the aluminum. > > Well, I am not going to run it 24/7 for sure, but will try to make a movie of the lights. > So a little bit of surface damage to that transducer can be easily polished away I think. > > >> I worked with a Physicist that studied acoustics, he designed all of >> the transducers, amplifiers, driving networks, I just built them. >> Wish now I had got one for myself just to play with. > > Nobody is stopping you to get one from ebay, 13 $ or so.I meant one of our high power units, 250 watts or 1000 watts.>> > He considered this one of his better books. >>> http://www.amazon.com/Sonics-T-F-Bolt-Hueter/dp/0471419761 >> >> Contents >>> http://asa.aip.org/books/sonics.html >> >> This book looks interesting, >>> http://tinyurl.com/qafp7hl >> >> 'Sounds' like fun! >> >> Mike > > It is a lot of study material, lemme build a model in my neural net when experimenting. > >Just wanted to give you some reference material.
Reply by ●November 25, 20152015-11-25
On a sunny day (Tue, 24 Nov 2015 15:56:16 -0600) it happened amdx <nojunk@knology.net> wrote in <n32m9u$ulp$1@dont-email.me>:>On 11/24/2015 2:47 PM, Jan Panteltje wrote: >> On a sunny day (Tue, 24 Nov 2015 13:53:20 -0600) it happened amdx > >>> >>>> Is the light coming from the bubbles at the surface? >>> >>> I'm not sure If I understand the question, >>> Surface of the transducer? >>> As I mentioned the light could be seen >>> all the way across the 20 inches of aquarium and then reflect back again. >> >> >> I meant the surface-to air bubbles, but OK, >> everywhere is good enough for now :-) > >The sonoluminesence follows the 2" diameter of the 2" (round) >transducer. Just a tube of light. > > >>> The sonoluminescence pretty much started at the surface of the >>> transducer, but it was important not to have a lot of cavitation on the >>> surface of the transducer, it would eat the aluminum. >> >> Well, I am not going to run it 24/7 for sure, but will try to make a movie of the lights. >> So a little bit of surface damage to that transducer can be easily polished away I think. >> >> >>> I worked with a Physicist that studied acoustics, he designed all of >>> the transducers, amplifiers, driving networks, I just built them. >>> Wish now I had got one for myself just to play with. >> >> Nobody is stopping you to get one from ebay, 13 $ or so. > >I meant one of our high power units, 250 watts or 1000 watts.250 = about 4 x 60 so 4 in parallel.> Just wanted to give you some reference material.Yea, that is OK. I think I solved the 'how to make a single bubble' issue. It is simple, if you use a round vessel, like a lab bottle (retort), the _sides_ are the mirrors that do the focus . []( . )[] not to scale. From this: the lower the frequency the bigger the bottle should be. Focal points from left and right should point to the middle. See what sort of vases (flower?) I can find. But nuf theory, back to the real world.
Reply by ●November 25, 20152015-11-25
On 11/25/2015 1:05 AM, Jan Panteltje wrote:> > Yea, that is OK. > I think I solved the 'how to make a single bubble' issue. > > It is simple, > if you use a round vessel, like a lab bottle (retort), > the _sides_ are the mirrors that do the focus . > > []( . )[] > > not to scale. > From this: the lower the frequency the bigger the bottle should be. > Focal points from left and right should point to the middle. > > See what sort of vases (flower?) I can find. > > But nuf theory, back to the real world. > >Hobby Lobby and Michael's would be my sources for this type of glass item. Mikek
Reply by ●November 25, 20152015-11-25
On a sunny day (Wed, 25 Nov 2015 06:26:21 -0600) it happened amdx <nojunk@knology.net> wrote in <n3499b$oj5$1@dont-email.me>:>On 11/25/2015 1:05 AM, Jan Panteltje wrote: > >> >> Yea, that is OK. >> I think I solved the 'how to make a single bubble' issue. >> >> It is simple, >> if you use a round vessel, like a lab bottle (retort), >> the _sides_ are the mirrors that do the focus . >> >> []( . )[] >> >> not to scale. >> From this: the lower the frequency the bigger the bottle should be. >> Focal points from left and right should point to the middle. >> >> See what sort of vases (flower?) I can find. >> >> But nuf theory, back to the real world. >> >> > >Hobby Lobby and Michael's would be my sources for this >type of glass item. > MikekI found a few vaseline glass vases, this could work too: http://www.ebay.com/itm/281863655496 After long thought I think the problem is that my mama raised me drinking from vaseline glass. At later age I found a locked box in the attic full of that yellow green glass, it gave me a funny feeling when I touched it (little idea what radiation was) mama told me to leave it alone as it was radioactive. Somebody must have told her, and she changed tupper ware. It explains my early enlightenment and my hunger for ever more radiation. And supperior IQ of course. But for those with less activity there is expensive lab bottles, and there is cheap fish bowls and flower pots on ebay: http://www.ebay.com/itm/321609112817 2$99 free chipping of course. Will this arrive in _one_ piece? Nice the holes for the transducers, but not opposite each other. May Bee I will order one. Its too small for big fish, but maybe for _one_ shrimp? I mean _after_ the experiment.
Reply by ●December 1, 20152015-12-01
Cydrome Leader <presence@mungepanix.com> wrote:> sroberts6328@gmail.com wrote: >> Might want to check, the original designer of that was retailing them west of 80$. >> I was holding off at 80, but was watching it. Never know these days when a product is a clone of a clone. > > Just ordered one for $38.something. While the board does look real simple, > I think the exploding your own parts to get it right would exceed the > price of the ebay one.Wow, it arrived already- 8 days after order. China to Chicago is faster than free shipping from Amazon. Obviously the thing went airmail.
Reply by ●December 1, 20152015-12-01
amdx <nojunk@knology.net> wrote:> On 11/24/2015 6:25 AM, Jan Panteltje wrote: > >> >> I came across this video: >> https://www.youtube.com/watch?v=LWO93G-zLZ0 > > RE; sonoluminescence > > Back about 15 years ago I worked at a company building High power High > frequency ultrasonic amps and transducers. > > Our basic unit had a 2" piezo ceramic transducer and was driven at > 660kHz with up to 1000 watts. > > We could set it in a 20" aquarium filled with water. Dark adjust our > eyes and when powered up, we could see a 2" sonoluminescent beam from > the transducer hit the glass 20" away the reflect back to the other side > of the aquarium. > We had the transducer at a slight angle so it would reflect off the wall > at an angle. > > This was multibubble luminescence, This was supposed to be the > advantage of our high frequency system, the thousands and thousands of > bubble collapses were able to enhance the *reaction. > When we used a focused reflector, you could see a white fuzzy area in > the foci and hear a hiss from the ball of cavitation. > > * I guess we never found the proper reaction to enhance, as the company > is no longer in business. :-) I miss it. > Our claim to fame was selling a 4000 watt unit to CalTech. > It had a 1 gallon flow through vessel with four--4 inch x 4 inch > transducers. > > MikekAny good ultrasonic "burn" type accidents or injuries? As I've mentioned a bunch of times before, don't just grab even a dollar store transducer powered by a wall transformer out of water. Not only was it painful, it was sone of those weird types of pain that is just weird enough to feel even worse. Small RF burns can be like that- it can feel hot but there's nothing hot there etc.
Reply by ●December 1, 20152015-12-01
On 12/1/2015 2:32 PM, Cydrome Leader wrote:> amdx <nojunk@knology.net> wrote: >> On 11/24/2015 6:25 AM, Jan Panteltje wrote: >> >>> >>> I came across this video: >>> https://www.youtube.com/watch?v=LWO93G-zLZ0 >> >> RE; sonoluminescence >> >> Back about 15 years ago I worked at a company building High power High >> frequency ultrasonic amps and transducers. >> >> Our basic unit had a 2" piezo ceramic transducer and was driven at >> 660kHz with up to 1000 watts. >> >> We could set it in a 20" aquarium filled with water. Dark adjust our >> eyes and when powered up, we could see a 2" sonoluminescent beam from >> the transducer hit the glass 20" away the reflect back to the other side >> of the aquarium. >> We had the transducer at a slight angle so it would reflect off the wall >> at an angle. >> >> This was multibubble luminescence, This was supposed to be the >> advantage of our high frequency system, the thousands and thousands of >> bubble collapses were able to enhance the *reaction. >> When we used a focused reflector, you could see a white fuzzy area in >> the foci and hear a hiss from the ball of cavitation. >> >> * I guess we never found the proper reaction to enhance, as the company >> is no longer in business. :-) I miss it. >> Our claim to fame was selling a 4000 watt unit to CalTech. >> It had a 1 gallon flow through vessel with four--4 inch x 4 inch >> transducers. >> >> Mikek > > Any good ultrasonic "burn" type accidents or injuries? As I've mentioned a > bunch of times before, don't just grab even a dollar store transducer > powered by a wall transformer out of water. >I don't have any, but have heard stories about customers at tech shows sticking their hand in the aquarium while our transducer was powered. They weren't very happy. Mikek> Not only was it painful, it was some of those weird types of pain that is > just weird enough to feel even worse. Small RF burns can be like that- it > can feel hot but there's nothing hot there etc. >
