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- เผยแพร่เมื่อ 13 มิ.ย. 2024
- This video takes a close look at those little chirping sonar cylinders that might have helped your robot avoid bumping into furniture. They're sort of like a microphone or a speaker, but looking closer they seem more like a tiny tuning fork with a hat.
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amara.org/v/IKCo/ - วิทยาศาสตร์และเทคโนโลยี
brilliant!! I love the hands on approach and the "hey, let's try this" attitude. I feel like I'm sitting at your workbench exploring with you. Thanks, Micah! I walked away smarter than I was!
Your videos are great! Thanks so much for spending the time to make them. The cork in those automotive ultrasound sensors is probably a cheap and effective sound absorber that reduces the echos caused by parts inside the car's bumper. Getting rid of acoustic energy from the transducer backside is surprisingly difficult sometimes.
I've often wondered about transmit vs receive air piezo elements. I'm starting to think its mostly marketing. Buying a "matched pair" makes it sound more valuable than just grabbing a handful of the devices from a bin.
The difference between transmitting and receiving part should be in theory by mechanical design. Older parts for receiving has two transducers stack on top of each other, thus produding double voltage on incoming sound, which is easier to amplify. Transmitter has single element because opposite situation: with low voltage producing more sound pressure. The problem is that cheap Chinese stuff... you never know what you will found. I am searching for the same transducers, but all I found is paired R and T. So, If I want to build parametric speaker with say 10 elements, I should to buy 10 pairs... And if I got luck to buy R and T paired, but someone made mistake during production and just put letters T and R on the same product - I will be more than happy to buy those.
Your videos are great too ;)
Excellent video. More than I even thought I would need to know about these transducers. A lot of your experiments are things that I would not have thought of or had time for. It is great getting all that info on one thing, in one place at one time!!
Out of the many DIY videos I've watched on TH-cam (which would include just about everything produced by Ben @ Applied Science), this video would rank as one of the better ones I've seen.
One off the very rare times I'm subscribing to a TH-cam channel. Thanks, limescan!
Micah great video! I've worked with ultrasonics in the industrial world for 35 years first as a tech and the last 18 years I've worked for a company that makes sensors of all kinds, we make around half of the industrial ultrasonics in the world now. One of the uses for the silicone and the cork in the automotive sensor may be for mechanical isolation. If an ultrasonic sensor is mounted so that it can ring through the structure it is mounted to it sometimes causes an interference. It's kind of interesting that steam or compressed air leaks near an ultrasonic will interfere with them also, they throw off frequencies and harmonics close to what industrial distance sensors listen for. Air temperature has an effect on accuracy also, you can actually use an ultrasonic pair to measure air temperature.
Hi Jim. Can I focus ultrasonic sensor to more recievers and measure each of theirs distance?
Outstanding video! Very thorough and detailed. Thanks for producing such a great tutorial on ultrasonic tx/rx.
Great video, It's funny how much we take for granted in these cheap little sensors but there is so much interesting engineering in them. Also, those articulating lightbulb sockets you have for your desk are really cool haha
I have to give props to Mrs lady here.. ma'am from a to z threw out this whole video I was able to follow and understand of course mines slightly diff but I have to tell u there is only 1 other person to reach me on the level u have kinda like u we're explaining things as u carefully took things apart I was able to "explain" to self what u we're talking about even at times before u explained some things explained them a lil early but mines threw sound of bass vibration an using diff things to amplify an as well as the type I have to no how things work an why they work that way I'm sure u no exactly how that goes .. bit however I wanted to give u Monday an mounds of props and I have to say u don't get paid enough they need to double ur pay and either u are were or need to be a teacher the world can use ur help u no how to get on just about everyone's level of explanitories as well as pace like the glue that sticks things together and make a proper sturdy durable foundation well Mrs I must say U ARE THAT GLUE that's the only way I can explain it at this moment I'm just so excited that there's another one out there like myself but with alot more extensive vocab and prob understanding..... 🥂🌋🏆🎖️📷📕📜📊📈⚖️💯💯💯🤙🖕👍👍👍👐👏👑....
That's what I was looking for.
Very good explanation.
Thank you!
This is great! Thanks for coving this in so much detail.
This is exactly what I was looking for. Thank you very much for your effort.
As a first timer to the channel and find the video as suggestion from some other video, the end was such a bummer I didn't expected am going to see a woman. Like I listened to whole video and thought am listening to some tech guy, I was bit shocked and amused with the reveal at the end. Guess you never knew what's coming. Giving you a sub tho 🤭
Thanks for all these videos! I am learning a ton from you. :D
im making a delay line memory, this helped heaps thanks!!!
Awesome! I bought a few of those years ago, and I've always wanted to have a good play with them. This satisfies some of that, and makes me want to dig them out. Was this the video with the improved audio? I noticed the noise reduction being a little weird at the beginning, but not at the end.
Awesome information-stuffed video! Instant subscribe!
Excellent explanation.... Thank you
Great work!
Thank you! I was Googling about these today for a future project, I should have checked your archive first >_
Great insight great voice, thanks
Excellent experimentation. I have a handful of these transducers and never thought of tearing one open to see what makes it tick (pun intended)... :)
I love it =), such detailed demonstration! I am definitely building the same measurement setup, can you please give more detailes about measurement setup?
Like your videos. Great work.
I enjoyed this - one thought is that the variations between the Transmitters and Receivers may be ore evident at different distances (you only test very close distances where the differences may not matter).
wow, excellent content!
great video
if you put a 40KHz sine into a T, then you take the same sine wave into an FM (SSB) modulator and connect it to another T, and you modulate with a signal coming from a microphone or an audio source, you should be able to achieve the laser counterpart of sound. The audible spectrum would be generated by the two ultrasonic waves beating when the second (modulated) one shifts. The interesting thing to do would be to test both free propagation, tube propagation and using a small offset parabolic dish
Hi Micah,
Great video indeed. I have observed on my side some noise when pressing mechanically on the side of the closed-top transducer sample. It seems that the piezo membrane is in contact with the enclosure. From your observation, do you confirm this detail? Also do you think there is a chance to break it if we keep something in contact with the top surface for a long time?
Awesome video. The pickup microphone is a standard electret?
Thank you for such an informative video. Does the signal shape (sine vs square wave vs sawtooth) have any effect on loudness at the microphone?
Great job dear....
Deep study in ultrasonic module . Good work... Good camera. Advance thanks for a question. How can we penetrate the soil with ultrasonic sound? Which module should be used. And which frequency should be used. I am going for a project for detecting the position and tracking of a underground water pipe line. Please help me.
Excellent video! Did you ever try using a lighter piezo crystal inversely, as a mechanical actuator? I did it but with 250 volts dc applied no measurable expansion. Maybe with AC excitation at resonance?
At 13:30 have you tried to squeeze the hose to see if it produces a strong enough echo to be detected and the position determined? Would be awesome if you could use this as a robot bumper-sensor with a thin and flexible hose.
Do you think the noise from these would be loud enough to bother your cat? I know 40kHz is in their hearing range.
I cannot follow your description since I do not speak English/American. :) I am interested in this topic and would like to understand "if" with these capsules can be used as a high frequency microphone? Behind the capsules is stamped T (TX) and R (RX) but we know very well that they are identical and it is only the dedicated IC that makes them work in TX and RX. What do you think?
very useful information
Hi Micah, can you say anything about power in these devices? One maker of these is PUI Audio, but they only rate things like 30Vrms or 20Vrms Max, maybe give a value for capacitance, and of course frequency. You're using a sine wave, but I'm wondering what would happen if I drove these as hard as I could with a square wave? If my dv/dt gets too high, will my amps burn those little tiny hookup wires? I want to build something similar to the 'Parametric Speakers' I see around, albeit for a different purpose. Any thoughts on power? Thanks, and great vid!
Your video is very informative but was wondering if you can scan and build a 3d model and print it accurately.
I have been looking for information on producing v2k. and I've looked at a lot of Ultrasonic Transducer products and tried to understand their concept so that I could maybe start building a directional microphone that I could use to locate the source v2k. LRAD is another thing to tinker with. could you come back to the topic in those terms🤔
At 11:13, it is true that R performs slightly better than T, but it destroys if continous oscillations are used. I tried it for my project on ultrasonic parametric speaker, and getting pretty low amount of modulation on R in comparison to T element. Also, tried to overload both elements up to 150V peak to peak, and it get hot pretty soon. Even at 75 V p-p it works okay for modulated signal, but stil warm. T element survives much longer than R. On the other hand, R elements has better and stronger voltage output when ultrasound is present. I believe that difference is in ceramic - R element has probably more 'polarized' ceramic (something like electret), so that it gives more voltage out. But at cost of rapid destruction if used as a transmitter end.
Im interested in these things, just curious, what's the smallest transducer/piezo? I've been searching and haven't found much. Is there a way to waterproof them, without loosing too much attenuation? I'd like to use them for both receive and transmit, in a spherical array, but I need/want the frequency response to be lower in the spectrum than the ultrasonic range (ie LF/MF/HF). What do you think the freq response is on these? does it change with size/materials?
would this transdusers be usefull at drowning out hidden microphones when driven at 25khz like as a spybug jammer?
I'm rather sure this got mentioned by now but halfway through the video a guide tube is shown that produces a complex amplitude pattern in the far field. I guess bends are a rather tricky thing in general because they represent a discontinuity what reflects some power back and introduces different modes.
Regarding the general shape and intuition for acoustic guiding, Applied Science has a video well worth watching (watch?v=vcSc16tnVqk
How a horn amplifies sound)
Do you think its possible to use one of these sensors as a microphone to record ultrasonic waves?
Can I use these receivers as a transmitter ? Please tell me.
I want to make an Acoustic levitator, but in my area I have only found those distance tracking sets and I would like to use both these receivers and transmitters as a transmitter.
awesome !
Is there a way to modify or use an ultrasonic transducer to vibrate or resonate frequency waves to separate hydrogen from oxygen in water?
Do you have any circuit diagram to use these transducers with a microcontroller? HC-SR04 or Parallax are good but I want to make my own sensor.
Hi micah, could you please explain the connections of the transducers once. Thanks :)
Hi Micah, thank you for the video. what microphone do you use to capture ultrasound?
6mm electret capsules like WM61 will capture ultrasound if you're a little bit lucky, subject to individual variation and a good bit of response waviness.
Hi there, what kind of sonic transducer do I need to amplify 358 kHz?
can i change the transducer of the arduino module (hc-sr04) to one waterproof? tnks
...thanks....very clear
I would guess the glue in the center of the cone is to tune it to frequency.
Thanks
I'm looking for an ultrasonic transducer because i want to build an ultrasonic cleaner , its very useful if you want to exfoliate graphite with a solvent like acetone and water for example ...
What transducer can I use to penetrate through wood?
Awesome
Why can't the same transducer simply be alternatingly switched between transmitting and receiving? I guess the answer is spacial vs. temporal resolution.
Hey can you tell me if an individual can use this technology to harass an individual or group.
Could you please inform which microphone are you using?
My first instinct when trying to learn something is to bury my head in a text book for a few weeks and more often that not never actually make anything. Maybe I should try your approach instead! Eh, I just remembered opening up an ECM capsule a few years ago while learning about microphones, but it's usually far less of the latter approach.
+Micah Elizabeth Scott oops, yeah I realized after posting that could be taken as an assumption that there isn't also "book" research going on. point being balance between book learning and play/experimentation is super important. i tend to focus too much on finding the "correct" answer by book learning vs the sort of intuitive learning by discovery you're demonstrating here. Anyways, thanks for another inspiring video!
Can you use the HC-SR04 as two speakers?
Pzt is a Plumbum -Zirconate - Titanate
There are these waterproof sonar sensors that cars use in reverse parking, that have only a single cylinder unlike the ultrasonic module in your video that has a Rx and a Tx. I was wondering how do these car ones work as I could not see a Tx. Do you know how they work - are the Tx and Rx both in that single cylinder?
thank you so much! that helps.
What microphone did use on the scope (the one that hangs down)?
I'm waiting for this answer too...
Can i use it to make a mist maker ??
Can we check the transducer using multi meter?
Only on capacitance meter. Expect to see something like high pF to low µF range.
Sonic welding is what that transducer is for.
I bought the same sensors, but I do not know which of the two legs is the positive and negative, if I could tell you, you would do me a favor because there is no technical match and I can not solve this problem. tanks
Micah Elizabeth Scott I have to use it to push the air and in fact on one of the two legs there is black insulator
Can u make alarm with those ?
Wise girl
👍🏻👍🏻
Probably the r has less mass but can't handle as much power as the t.
very good. what is distance that can measure. how meter. war Iraq need radar to discover explosion.
wtf? This isn´t usefull to discover explosions, as they are not in the 40 kHz Range..
I heard from a colleague that it's not wise to dip your hand into a ultrasonic cleaner because the energy will pass through your flesh and make tiny bubbles around your bones. Pain comes with the bubbles before they get absorbed by your body much later. I assume holding the transducer from an ultrasonic cleaner will do the same to your hand...
+Micah Elizabeth Scott Yeah i guess the air transducers are just fine because they're designed to vibrate easily and pass the energy to the air, just as all normal speakers are. I was only concerned when i see you holding that cleaner transducer tightly - it has a much larger mass (to be able to transfer a lot of energy into water) - and you were getting it all by holding it firmly. Nothing to worry about if your hand feels nothing afterwards. Just saying.
+Micah Elizabeth Scott I really doubt there's anything to worry about. In a previous job, a collegue would test ultrasonic marine fishfinders by putting them against a temple, and if he could feel it on the opposite temple then it was transmitting :)
+Jacob J Did he find fish?
And if he COULDN'T feel it? Time to call the coroner.
Can I use a scavenged audio speaker coil / magnet for a transducer in a cleaning tank? I have a VERY strong hunch that I am paying more for the tank than I am for the transducers ... and, for the size tank I'm interested in, the prices are well in excess of $1200.
Thank you. Have decided to save up some shekels ($1,222) and buy a Lyman Power Pro TurboSonic cleaning tank. That is basically what I was hoping to DIY and I'll have the funds in about two weeks. Ten transducers, heater, timer, long tank and a, hopefully never-needed, warranty.
I DO want to say that I am pleased to find a woman over here in DIY / MAKE land. That doesn't happen often and you certainly seem to know your stuff (better than I do).
BY THE WAY: do you know anything about induction heating? I have some sand that I think contains gold and would like to concentrate it by melting it out of the sand ... and also a TON of brass that I need to anneal. I can hit the temps I need with propane, but that generates a LOT of waste heat.
hello how are you
Sweeet !
Hello
Can these be used in a device worn by cops who stand ground while protesters scream in their faces?
like and sub, good stuff
thank you for all explanation . and i surprise at the end of video that you are women. for all that you get from me like an subscribe . again thank you
I though that im listening to a guy 🤦🏼♂️😂 by the way i really wanna thank u for the information
you must be more slowly we are not english or us citizen
etc