This video shows air flow visualization using a laser pointer and mirror to see vibrations on a rubber membrane enclosing a Bluetooth speaker. A bluetooth speaker was placed in a plastic container and a large balloon was stretched over the opening of the container. A small mirror was then glued to the top of the balloon. A laser pointer was pointed at the mirror at an angle, which resulted in seeing the laser’s reflection on the wall. Using a function generator on my phone, I played different frequencies through the speaker and recorded the laser’s motion. The laser represents what is happening on a small cross section of the balloon. For the video, I used a Nikon D3100 filming at 1920×1080 and 24 frames per second.
Report: First Team Report John Monahan