Three dimensional schlieren using iterative phase tomography

Tomography technique was used to recover the three-dimensional density distribution of a flow field generated by a rectangular nozzle. The flow field was investigated through background oriented schlieren (BOS) setup, where the flow induced density gradients were captured as a 2D projected image. These 2D information were post-processed to retrieve back the phase of the interrogating beam, which later used in tomography. The research was an attempt to use iterative tomography technique with BOS captured data for quantifying the three-dimensional flow field. The ability of the proposed technique, which required relatively lesser projections to recover the three-dimensional domain was verified through iterative phase numerical simulations. Even CFD simulations showed good agreement with experimental data.