My video shows the phenomenon of sand resonance. The audio exciter is taped under a square foam board and sand is sprinkled on the foam board. When the audio exciter is activated, it transmits vibrations throughout the foam board, and the sand resonates as it forms different patterns under the influence of these vibrations. Even though sand is a solid, a large amount of sand can flow to form visible, unique visual patterns.
The control terminal (in this case it’s a smartphone) can be used to adjust the waveform and frequency. I tried the following combinations: 80 HZ sine wave, 180 HZ sine wave, 180 HZ triangle wave, 180 HZ square wave, 210 HZ sine wave, and 360 HZ sine wave. In this experiment, it seems that only the frequency affects the pattern formed by the resonance of the sand, while the waveform does not have much effect on the patterns.
Acknowledgments: Thanks to my team members Abhishek Raut and Alexandr Vassilyev, who provided equipment and suggestions on the filming.
- Camera: Sony ZVE10 Mirrorless Camera & Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD Lens for Sony E
- Lens/Focus length: 20mm
- Resolution: 2160×2160 (Final) 3840×2160 (Original)
- ISO: 250
- Aperture: f/3.5
- Shutter speed: 1/50 s