This project seeks to develop a MHz repetition rate Pulse-Burst Laser system to imaging high-speed flow fields. It makes use of the fact that light is scattered from the air molecules so that a high-power laser focused to a sheet can be used to generate a cross-sectional image of a flow field. Background scattering from windows and walls is eliminated by passing the light through a newly developed molecular filter which is placed in front of the camera. This project involves the development of the optical filter technology and the extension of the imaging approach to the capture of time-evolving flow strucure and volumetric images. Using the MHz repetition rate pulse-burst laser system and MHz framming rate CCD camara, (developed by Princeton Scientific Ins. Inc.), we can capture the dynamics of the supersonic and hypersonic flow structure.
Experiments have been done using the MHz imaging system:
(The Quicktime Movie plugin is required to view these movies. This plugin can be downloaded free of charge from Apple.)
Visualization of Shock-Wave/Boundary-Layer Interaction in Mach 2.5 Windtunnel (Quicktime movie)
Separation Shock Structure at Mach 2.5 (Quicktime movie)
Transition study of Mach 8 flow over a 4:1 Elliptic Cone (Quicktime movie)
Propagation of shock wave initiated by MHz repetition rate pulsed laser in supersonic flow. (Quicktime movie)
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