Spray Droplet Size and Velocity Measurement using Light-field Velocimetry
T. Nonn, Vincent Jaunet, Samuel E. Hellman · 2012
The past decade has seen considerable activity reg arding light-field cameras and their application to p hotography. The ability to refo cus images over a finite depth range has consequently led to interest in mea suring the distance of objects from the camera. While originally developed for imaging structured opaque surfaces, interest has led to successful appl ication in volumetric flow-fields using a commercially developed light-field c amera. It is then expected that once particles are successfully imaged in 3D PIV flows, 2-phase and spray flows naturally follow. This paper focuses on the measurement of droplets in a spray using a light-field camera. While previous measurement techniques utilized a limiting 2D shadowing technique, measuring the size and velocity of droplets silhouetted from behind with uniform illumination, light-field measurements open the possibility of accessing the depth position, and th us the 3D position and velocity of individual droplets.