Randi W.
Schlieren photography is a visual process that captures the flow of fluids and nonvisual gases of varying densities. The technique was created by German physicist August Toepler in 1864 for the purpose of studying supersonic motion. Utilizing this approach, my project illustrates the effectiveness of various masks. An open flame sits below the camera’s lens, and, with a light source shining through a magnifying glass and into the camera, the glass’ rainbow effect splits the high pressure from the low pressure distortions, effectively showing the imperceptible waves above the flame. I then attempt to blow out this flame. The amount that these attempts distort the image is an indicator of mask effectiveness, i.e. the amount of air able to pass through the mask and hit the candle.
My class–Ecology and Infectious Disease–encouraged me to create this project. The vehicle in which transmission occurs was a vocal point in the class. Direct transmission, like an individual coughing, is a form of transmission infectious diseases use. Although masks, regardless of effectiveness, are recommended, it is important to note the strength of each mask, and what works best. Visually seeing this demonstrates that any individual can test and verify these ideas. During the creation of this project, the set design went through many iterations. The first version involved a curved parabolic mirror, a LED light, camera, and trust. Unfortunately, the light source was not concentrated enough to efficiently divide the pressures, and the mirror’s optics were insufficient. The second version included a magnifying glass, iPhone spotlight, and a Canon Rebel T6. The camera was not strong enough to capture the glass’ rainbow effect - which resulted in a circular, bright, solid light that could not capture air distortions.
In the last version, which is the one presented, a Canon EOS 7D was used. This camera is capable of achieving a shutter speed of 1/8000, and an aperture of F16. This allowed the device to capture the rainbow effect, producing sufficient results. My project is meant to artfully and scientifically showcase the efficacy of different kinds of masks–and furthermore, it allowed me to engage in a new type of photography.