Visualizing Ultrasound with Schlieren Optics Part II

Part 2 of 3. We use our strobing schlieren system to look at diffraction and standing wave patterns in air created by an ultrasonic transducer (driven at 28 kHz) and a reflecting glass plate. More information about our schlieren optics set-up and how it works can be found on our website: https://sciencedemonstrations.fas.harvard.edu/presentations/schlieren-optics Safety Note: Although 28 kHz is beyond the range of human hearing, ear protection should be worn whenever attempting this experiment to avoid damaging vibrations in parts of the ear. Any high-pitched whines you hear in this video are not dangerous.