Ultrasonic acoustic levitation
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- เผยแพร่เมื่อ 22 ก.ย. 2024
- Making stuff float in the air with sound
Search acoustic levitation or ultrasonic levitation on youtube for other examples
Search ultrasonic transducer on ebay for transducer from China
Driver schematic electricstuff.c...
Very nice use of standing waves; never mind the levitation, I can see a use in an undergraduate laboratory to "visualize" nodes and anti-nodes.
My estimation (using your finger as yardstick) is that the anti-nodes are at about 1cm intervals, hence the wavelength of the sound is about 4cm. Given a propagation speed of about 330m/s, this gives a frequency of f=v/wavelength = 330/0.04=8250Hz=8.25kHz; that explains the "audible whine".
Well done!
Very cool project! I really enjoyed seeing this. If you are looking for other things to do with that powerful transducer, you might consider ultrasonic drilling.
Awesome vid Mike, your method of conveying very complex systems in not so complex ways, simply is not matched on TH-cam!
i was involved in development and prototyping of ultrasonic cleaners and I remember how powerful ZAP the piezo can build up over time of being just left alone
the rough surface is probably for better epoxy adhesion if you go for that kind of mounting
That's the most awesome suggestion anyone has ever made on my YT channel - will definitely try this once I remind myself about Shlieren optics (only barely understood it when I was trying to figure out how an eidophor worked)
This is really cool! I've just realised that a lot of the theory I use in my research for holographic modulation also applies to ultrasound... If you had a shaped plate (like a fresnel lens, or zone plate) you might be able to focus the energy to a point. If you modified it to give you a doughnut shaped point (like I believe they do in STED microscopy) you could probably levitate slightly denser objects (in a single point).
How rigid/string does that plate need to be?
Mike, this is 3 years old video, but I am just beginning to mess with ultrasound. I found that perforated PCB increases coupling from transducer to air almost 3 fold. I suspect that increasing surface area by introducing material with holes actually helpnig better coupling. Just one thing what I do not like in this case is short focal point of about 45 mm on 40 kHz transducer with diameter of 45 mm.
Parking sensors are a cheap source of powerful ultrasound. Being able to levitate liquids or insects is not a problem: www.acousticlevitator.com
Finally I got what I was looking for in this extraordinary channel!!
First though: Oh shit new mike video, cool! Upon watching: oh my god this is the coolest thing I've ever seen. Great video man, really quite incredible, plus you manage to teach me something new every video. Dry ice from fire extinguishers... Awesome. it looks like the electrostatic charge is keeping the balls in one line to me. Cheers for another great video, Mike!
I think that the sharp resonance will do a lot of the filtering mechanically - will play with drive more at some point. Source impedance probably also wants optimising. Main issue is to stay resonant as temp changes so needs some feedback to keep it at the maxpower point.
I like your selection of 'strange' topics. You and Be Krasnow definitely take the lead in in the category 'Topic Variety'. Keep them coming, I enjoy watching.
It needs some sort of error correction feedback loop to make levitation more stable .Could be done with optical feedback maybe lasers which determine when object position is becoming unstable ,then loop adjusts frequency or power to compensate . Good vid Mike .
Good stuff. It's very interesting to actually see what sound waves look like.
Use a tuning fork attached to the top of the acoustic transducer, its a design idea of mine, (patent pending) you can attach different tone tunic forks to the transducer and change them out... increasing or decreasing the frequency will change the tone the fork transmits, also using a aluminum tube surrounding the tuning fork will concentrate the sound waves in one direction, one could use a parabolic dish at one end of the tube to aim the sound waves at a specific point. It's the parabolic listening dish except in reverse, used to transmit sound rather than receive sound.
I can only a assume the variations are small and/or it's more about air motion than pressure.
I did filter the audio, but didn't want to muffle it too much
That transducer you are using has bad acoustic coupling through the air. It will be good to somehow glue many cones as resonators. I tried remove single one from Arduino distance meter and temporary stick to it - it increased effectiveness. Now experimenting with single small transducer, just transmitter part of distance meter HS-SR04 and got decent results. Great idea with soap bubble - excellent for visualizing standing waves and where is the focal point of the reflector I am using. Thanks again, great video!
Wow! Your videos never cease to amaze me.
Also, if your top surface is concave (try using a glasses lens) this will reflect and concentrate the field giving you a more stable field
Have just looked at the numbers, and it may be that, even with ideal lighting, a sensitive Schlieren system would be required to detect the standing waves. A 140dB sound results in about the same change in air density as a 1°C temperature rise.
WARNING, HEARING DAMAGE!!! WEAR EARPLUGS IF YOU BUILD ONE. Below ?50KHZ? your ears can't hear it, but it will slowly chew up your cochlear hair-cells. Symptoms: louder and louder hiss/squeal tinnitus in your ears which persists when power is turned off. SOMETIMES PERMANENT. I accidentally did this to myself in 1992 with three watts of 30KHz, but went away after weeks. A colleague got permanent tinnitus in one ear from building a hundred-watt 20KHz tweeter array to use against barking dogs.
+wbeaty Note for everyone else, this only applies to actually doing it yourself. Before digitisation, the high frequencies get filtered out so don't worry about watching the video! This would depend on the actual codec used by the video itself and exactly how it does the digitization. I can hear some pretty high frequencies coming out of the video, but they seem to be pretty quiet. It would also depend on how good your speakers are at reproducing the highest frequencies.
Oh no, terrorist weapon: websites which attack your ears with silent high-power 20KHz. If youtube bandwidth was wide enough, then just post viral videos with dangerous ultrasound and also a too-low soundtrack, causing people to crank up the volume to max.
+wbeaty if only I'm rich enough to afford a good hi-fi setup
Can this sound be absorbed by water or something soft like a construction foam? I'm trying to build an ultrasonic bath with a 60W 40KHz transducer and your comment has worried me a lot.
> be absorbed by water Yes, water blocks the sound, and usually sonic baths cause no problem. The hazard arises when the transducer face is in air, and especially when adjusted to create a standing-wave in air. Best: ultrasonic cleaner with auto shutdown if the water level is too low. Also provide a metal cover over the water. Usually these units have a cover, to prevent water splashes as well as the annoying screech of sub-harmonics from cavitation bubbles.
It feels kinda funny, no obvious immediate effect or pain but realised that tissue damage by cavitation is a definite possibility so avoided more contact
Erm... I had a phrase on my lips but it seems inappropriate considering how cool this is. Good work Mike!
so much more fun than that odd guy down under who only plays with test gear keep it up
Brilliant. Really enjoyed watching.
I'd also wager that if you put a screen mesh above the transducer you might be able to keep the falling objects off the transducer and still get it to operate. I'm curious though if a mesh would funk up the standing wave.
He did touch the surface of the transducer quite a few times during the video, didn't seem to have any noticeable affect (or a Mike scream).
Great vid Mike.
Will try it, but I think the emissivity of air is too low to see even very hot air streams. Need some Black gas....
"So your sonic device can turn screws?" Indeed. I can imagine you could attach two transducers to each end of some assembly and feed them with different frequencies to create a beat frequency which biases the screw. I'm sure there must be a specialist application where this is desirable.
Amazing! Great job, Mike!
Mike is a genius.
Try waving dry ice through the field - this shows up the position of the nodes nicely
This is absolutely amazing.
maybe aerogel, but I wonder if it may be damaged by the ultrasonic energy
I suppose there may be a small market for a driver kit but I really can't be bothered!
Yes, definitely.
This is excellent video! Thank you! Around 28Khz you say? Looks like resonating waves were creating an electric charge transfer process. Essentially magnetic field planes.
That's a cool experiment! I wonder if a nice damp PG/VG smoke machine mist would work ? Also maybe cranking it up on the variac will create a black hole?
I did play with cold alcohol but wasn't very successful - I think the droplets would be too heavy, if they formed at all
Very interesting Mike, even if the audible component reminds me of being at the dentists lol! In ultrasonic cleaners the transducers are indeed bonded to the tank with epoxy. Well, the one I have here falls off periodically and gets stuck back on with RS quick set :) the tank is stainless and not a good surface to bond anything to.
Nice use of the atc pc transformer!!!!
Problem is how to slow them down so they capture - they just shoot right past
Enjoyed this something people spend loads on and you do it cheap awesome work!
So your sonic device can turn screws? Fascinating. We must research this further.
Hi Mike: Well try this. Take one of your empty French cologne atomizers, fill with oil. Maybe you can get a finer less energetic mist than comes out of a spray can, I don’t know. Cheers, Mark
Also I noticed after the video a related video using a second transducer and plate to have the beads fixed in 2D space. Interesting idea to bump up the dimensions.
Great demo. I learned a lot from this. thanks for posting.
You're English, and now have a sonic screwdriver - Mike is the next Doctor Who!
Cool project, thanks for the video, gonna try it. What transformer is it?
your beads are sitting at the antinodes where no air is moving. you could theoretically do the same on a vibrating string,
As I understand it, a Shlieren setup isn't even that hard to build, it's just that it requires a spherical mirror larger then the subject you wish to analyse/photograph.
I actually once looked into buying a telescope primary mirror for Shlieren photography experiments, but they're expensive, and I couldn't afford it.
Good video!!! Could gravitational potential and electrical potential be linked together? They both use the inverse square law! In this theory gravity is a secondary force to the EM force. Objects just free-fall towards the greatest energy because it has the greatest time dilation! In this theory ‘time’ is an emergent property formed by each new photon oscillation of vibration. By the way this is an invitation to see an artist theory of the physics of ‘time’ as a physical process!
It's quite reminiscent of the motion in some UFO reports. I have long suspected they use a lot of standing wave constellations to do what they do. Although presumably not audio.
Some kind of standing gravity wave with earth induced by standing EM waves in the hull surface.
You could totally sell kits for these. I wonder if there was a way to create it so that you could noise cancel the ultrasonics outside of the space that the device sits.
It is interesting. Thanks
The problem I would guess is that the smoke in front of and behind the standing waves will obscure the smoke affected by the waves.
I'm wondering if you could use this to create layers of grapheme? What happens if you use a humidifier to transport a solution into your contraption?
Have you tried some smoke? Maybe you can visualize standing waves. As well, maybe soap bubbles would be interesting to try.
Perhaps forming a parabolic/concave dish and attaching it to an appropriate thread to screw into the transducer might help?
Instead of dry ice or alcohol, you could use a cheap ultrasonic humidifier/vaporiser and channel the stream into the standing waves of the main transducer. I'm guessing using the same transducer to also create the mist would not work well.
This was brilliant
Perhaps you should try something like this? I love your channel by the way. Very interesting stuff.
I maybe need to buy two more to see if 3D is possible
Yes - you don't see anything at all. Not sure why.
Hi Mike: Try levitating a mist of oil droplets from a spray can, WD-40 or the such. Think Faraday's oil drop experiment. Cheers, Mark
You should totally make an Ultrasonic Jenga Kickstarter.
i think hot air and an IR camera would be AWESOME
Great video Mike - thanks for sharing!
oh man those high pitch noises hurt my ears so much
dude this is freaking awesome
You tried Schlieren photography techniques to view the air currents? Cheers for the video, very interesting stuff.
Yes, it would. Smoke might work better though.
Will give it a try
very cool stuff!
That is so awesome! Thanks for sharing this.
imagine using transducers on cars in the future, take the friction off the road, that will be really efficient.
Mike you said what I was thinking- school science fairs! How many safety precautions would you add to let kids run it unsupervised?
I did - no effect. Flour is quite dense
Did you try letting smoke waft through the waves? I think that'd be pretty cool to see
maybe you could make a self tuning circuit with a pizo speaker stuck to it and some microcontroller to keep it from shifting frequency
My lcd tv sounds like that when I am in "game mode" (high refresh rate I guess...). Very cool experiment by the way, compared to these ultra "snob" setups
You have a concave mirror, don't you? (from the monochromator, I think).
You should try to rig up a Schlieren photography setup using that mirror, so you can see the density variations in the air. All you need it a light-source immediately adjacent to the camera's lens, and then you put the camera pointed into the mirror at the mirror's focal length.
Well that was disappointing... Tried a shlieren setup, sensitive enough to see heat rising from hand. But with the ultrasonics - nothing. Zip. Zilch.
Mike, have you tried welding plastic with this transducer?
You may have to make some kind of horn to concentrate the waves again.
I'm wondering if the fact that you're driving it with a square way destabilizes the thing, (or on the other hand maybe stabilizing it.) Have you tried putting a one or two stages of LC filtering at the output once you've figured out the tuning of the frequency? Also, a more function generator is probably desirable as well after all. Having the output power modulate the frequency probably is the best idea for stability.
very nice! and extremely interesting
Ultrasonic Jenga....lol. Cool vid very educational 👍
Cars driving down the street is my best guess. :)
Put a stainless rod on the business end and you have a sonicator, you can use it to disrupt bacterial cell walls, if you were into that sort of thing.
Fantastic video Mike! Did you work out how much power per bead was needed? Also like to point out that after long years of guitar filled nightclubs, (even with earplugs) I happened to acquire tinnitus. Y'know, constant high pitched squealing in you ears? I therefore happily could not hear the tone people have been complaining about in this vid. Might have been the exact same pitch. I never thought tinnitus would come in handy...:)
It makes me think about a large number of Tibetan Monks who performed deep throat singing with many in a group. I question, what achievements of levitation they managed to accomplish ?
Thanks for an interesting demonstration.
+Agui007 That is not a bad question - It's new agey and even wacko, but it's not a bad question.
Obviously if a human voice can shatter crystal, and speakers simply 'passing sound' can 'levitate matter' inside of a "standing wave"....
How 'weird" would it really be that certain aspects of things we see as 'wacko' are simply unscientifically experienced anomalies based in scientific fact...?
Our knowledge was many times greater thousands of years ago than today and now it has been seriously reduced to a very low level. I've visited Avebury and they seriously expect us to believe those stone were manually moved by man!! I can just imagine it "alright Bill you grab your end and Bob, you lift end up a bit". What we are discovering now is nothing new, simply rediscovering what once was. Thanks for your compliment too ;)
Derp mode activated
Just to check, were you using a continuous light source for the Schlieren? The pressure at any point averaged over a whole cycle of the oscillation will be extremely close to atmospheric pressure, so I wouldn't expect to see anything with a continuous light source. A stroboscopic light source synchronised (with some phase offset) to the transducer might well work better. (The phrase 'stroboscopic schlieren' comes up with a number of ultrasound-related papers.)
Can you try putting a wide-enough glass tube between the source and reflector? That might lessen drafts and make the system more visually stable.
Very cool.
I'm imaging all the dogs in your neighbourhood going beserk!
Really cool.
Absolutely amazing =)
search 70w ultrasonic transducer on ebay
Mike, I followed your design for this and it worked great! Thanks. Unfortunately it stopped working. It appears to be the transducer. How many ohms should I read across the terminals of the transducer?
It was my dog. She was in the room when I played the video. She left quite swiftly.