A large-field laser holographic focusing schilieren systemA large-field laser holographic focusing schlieren system for high-speed flow visualization has been built and evaluated. This system is based on a recently improved large-field focusing schlieren technique and is combined with laser holography methods to record three-dimensional flows. A coordinated experimental and computational study of supersonic flows over wedge, cone, and sphere geometries was conducted to evaluate the capabilities and limitations of the system. The ability of the system to focus on planes normal to its optical axis is demonstrated. The sharpness of focus of the present system was found to be limited. Issues regarding obtaining quantitative measurements of the density gradient are discussed.
Document ID
19920074142
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Doggett, Glen P. (NASA Headquarters Washington, DC United States)
Chokani, N. (North Carolina State University Raleigh, United States)