Date of Award


Degree Name

Master of Science in Engineering


Mechanical and Aerospace Engineering

First Advisor

Dr. Tianshu Liu

Second Advisor

Dr. Christopher Cho

Third Advisor

Dr. Javier Montefort


Optical Flow, background, oriented, Schlieren, measurements

Access Setting

Masters Thesis-Open Access


This research describes an experimental study on the density gradient by applying the Background Oriented Schlieren technique with the physics-based optical flow using a simple setup. The design of the BOS setup primarily consists of a background which has random dots, and a high-speed camera focused on the dots. Variation of the density between the undisturbed image and the disturbed image led to a shift of the dots, which is used to generate displacement field by using the optical flow method. In addition: different pressure conditions were applied, to provide distinct displacement fields. Finally, the density gradient of flow was visualized by BOS measurements based optical flow.