Sympathetic Resonance

This video is a demonstration of sympathetic vibration/resonance using the optical (flame) microphone. I designed this simple optical microphone back in 2004. It has many unique qualities and I have given the design to the World.
In this demo the device is placed in front of a normal loudspeaker. Music is played at moderate to high volume, the flame reacts to the complex sympathetic vibrations and resonances of the music. The sound you hear in this video is the actual vibrations of the flame. This is captured by the photoelectric panels on each side of the flame and this electrical signal is converted back to sound.
Thanks goes to the late Roy Orbison, who's unique vocal range gives the flame a real workout.