Ultrasonic horn - measuring vibration amplitude 

I'd just like to add that you can drive the Piezo with a DC voltage and it will precisely move via growing or shrinking, depending on polarity. I think you have measured larger deflections when it is AC resonating due to inertia and elastic effects. I mention using DC for positioning your optical experiments because it far easier to accurately change the size of the Piezo element with a DC power supply say +/- 10 V and varying 100-1000th of a volt) than the finest (and bulky) micrometer. You can make _repeatable_ Sub-Micron movements via a 20Turn Pot + voltmeter, or even an Arduino DAC output! Bonus: It will draw nil DC current = will not heat up and drift, AND you don't need the horn element at all. P.S. Thanks for the Resonant Horn video!

That's a clever little hack, very cool!

Hello Lindasay, i could close the PLL loop for the CD4046. i ve been following your job a long! kind regards

Wow, that ultrasound really messes with the microphone on the camera. How about hearing damage on these frequencies? Should you wear hearing protection - i would think so ...

Great video - very basic question for testing off shelf ultrasonic driver board if you might entertain an answer... Can a load such as a bulb or shunt be connected to the transducer output to see if its working correctly? I do have a scope and meters but curious why/why not the output stage wouldn't drive a bulb?? Tryinv to repair one and eliminate transducers as failure point. Thanks!

Hey Lindsay, nice experimental setup dude! One question though: how do you know you can assume that the horn is stopping exactly at its midpoint every time you switch off the power supply? I would expect that the resting position could vary somewhat depending on the phase of the amplitude at the time you switch it off. This could be a source of the scatter in your measured amplitude...

Bravo.......piezoelectric pickup.......maybe mount another horn on the other end ........and us is like a microphone or signal generator ....cheers

Hello , I have an ultrasonic homogenizer toption 1800E horn type , I bough it one year ago . Now it doesn't work and fail to produced ultrasonic wave ... Can the problem the horn metal

cool! does anyone know where i can find that inverter? been searching everywhere

A jfet pre amp mounted really close to the ball bearing might be able get the impedance to a readable level for the oscilloscope, similar to a condenser microphone capsule. This method apparently works pretty well though too. Love the giant micrometer head, now I want one!

Hello, I saw a few of your videos on youtube and thought i give it a shot and reach out to you. i can send you a 3d rendering of my lint remover to see more of what i am talking about if need be! I put a few vibrator or erm motors in my prototype and is definitely helps performance but then we took the philips sonmic care toothbrush and this even more helped performance. I was wondering if you could guide me on how to get the sonic vibration i need and if preferably if i could just borrow like 10 minutes from you to get on a phone call to perhaps guide me on how to get that desired sonic vibration i need! The erm motors are more so rotary motors and this then has to translate into a liner movement on my razor blades, but i know that if i use at least a 3.7 volt (rated voltage) sonic motor and somehow add some magnetic pressure or a magnetic bar, this would be more so a magnetic motor and since the motor is already moving in a linear direction it would more efficiently transmit the mechanical energy to the blades in the desired back and forth (side to side) motion as opposed to going from a rotary force from the motor, which would give me more vibrations per minute, which would increase performance! I think that all these things that i need can be sourced by my chinese manufacturer and they would just plug it in the handle and that would be it I really hope i am making sense, becasue as you can see i desperately can use the help and i will pay you for your time if you decide to have a quick call as i am very bad at explaining these kind of things over writing as English is also my second language Although a motor that moves more so side to side versus in a rotary fashion, would be most efficient in the oscialltion effect i need in my application! Hope to hear back from you and please fell free to call me if you like anytime that is good for you and i will definately pay you for your time no problem at all as it would be so worht it to relieve a lot of this stress Sincerely Eldar-

compliments for the precision of your measurements!

Hi, I'm doing research on the application of ultrasonic in chemical reaction, which will involve surmounting an ultrasonic horn in a vessel. I wish to know what brand your are using and the diamater & length of the ultrasonic horn you were using. Thank you.

Hey Lindsey, great video and problem solving skills. look forward to see what you come up with for FO sensor to monitor amplitude. Very practical idea.

Awesome videos! I have been researching ultrasonic transducers the past few weeks. I was curious to find out if making a DIY ultrasonic soldering iron was feasible. Purchased a cheap 60w transducer + driver board for ultrasonic cleaners from ebay to experiment with and having my friend machine a horn for it on his lathe. The most basic 40w to 100w Ultrasonic irons cost several thousands, but all seem very simple in construction and operation. From what I understand, inorder to ultrasonically bond solder onto otherwise non-solderable materials, you just need to vibrate the puddle of molten solder, not so much the whole iron tip. Your thoughts? - Mike :)

Very educational video.

How can we check horn ? No crake seen on horn

hi lindsay i did speak while ago i have bought this power unit dont know how it works TA Systems TA-40ECS Ultrasonic Plastic Welder Welding Head Converter 40kHz

hi lindsay ,i was wondering , would a be possibble to make diy ultrasonic welding machine? could you give me some information please i am base in edinburgh dalry road, fabric revelation

Price?

Won't it be easier to use a eddy current probe?

is this LVDT ?

If you had a flat surface opposing the horn tip 20 um away, that would be about 100 pF. I haven't much experience with electrical measurements, but one simpleminded approach would be to make that one leg of a wheatstone bridge, excited at 1 MHz or so, to get differential capacitance measurements. Also, I recall running across some or other integrated circuit to measure small capacitances when I last considered solving a problem like this. There might be an easy solution in that domain.