Visualizing Ultrasound with Schlieren Optics Part II

[@whosscruffylookin95]

this series deserves more views. wonderful explanation and a nice setup

[@NatSciDemos]

Glad you liked it!

[@glikar1]

Absolutely beautiful demonstration!

[@f_24-o8d]

Can you apply this setup for visualizing electrical breakdown in air?

[@fjs1111]

Love this professor, thank you!

[@DejanSpasovski]

The wavelenght in the video at 2:30 does not match the markings of the ruler. we should see 6 approx. 6 full wavelenghts but we count almost 10. How do you explain this. Is it a byproduct of the strobe maybe? Also observing the waves in the lower right part of the picture where we see two full wavelenghts per 1.2cm. Any thoughts?

[@wolfgangrueckner7151]

This is a standing wave (as opposed to a traveling wave) and a bright band occurs every half wavelength.

[@DejanSpasovski]

@@wolfgangrueckner7151 Oh..yes, my bad. That makes sense now! Thanks for your kind reply. Really amazing demonstrations.

[@mankap196]

Excellent presentation! But wouldn't the standing wave be visible to us, even without the strobing light?

[@wolfgangrueckner7151]

correct

[@IronMoe]

please make more videos like this

[@Stuff924]

I would like to see interference patterns of different frequencies

[@poweronegaming3681]

That's amazing 🔥

[@sahinmcelen]

Thanks for the answers I already dreamed

[@HumbleBasse]

wonderful ;) good job

[@purplepick5388]

mindboggling !

[@samjongman929]

could you maybe tell me something more about how you setup the transducer?

[@wolfgangrueckner7151]

The ultrasonic waves are generated by a 28 kHz transducer designed for ultrasonic cleaning baths. These are typically driven by a push-pull oscillator specially designed for this application. Many are controlled by an Arduino microcontroller. Ours is driven harmonically, powered by a Samson Servo 120 audio power amplifier. The input signal comes from a sine wave function generator. A home-made impedance matching transformer couples the 8-ohm output of the audio power amplifier to the ultrasonic transducer.

[@AdityaMehendale]

Aren't you worried about tissue/bone-damage when you touch the transducer with your finger? (Is the power really low?) Cool demo!

[@wolfgangrueckner7151]

The power is very low (8 watts).

[@DerptyDerptyDUM]

😮