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Non-intrusive Laser-based Diagnostic Techniques for Hypersonic Flows (1-Day)
Defense Forum, Kossiakoff Center at Johns Hopkins University Applied Physics Laboratory, Laurel, MD
High-speed vehicles are subject to complex fluid effects including shocks, turbulence, real gas effects such as dissociation and nonequilibrium energy distributions, high-temperature gas-surface reactions, and combustion. Due to these complexities, detailed experimental measurements are necessary for the successful design and optimization of supersonic and hypersonic vehicles. However, most of these phenomena are difficult or impossible to study using surface measurements due to their limited domain or physical probe-based techniques that inherently perturb the environment they aim to study. In contrast, optical and spectroscopy-based techniques offer the ability to make off-body measurements with little-to-no system perturbation of qualitative and quantitative flow properties including velocity, gas temperature, and species densities. This course aims to provide background theory on several spectroscopy techniques, technology required to execute measurements, and examples how they have been implemented previously for large scale wind tunnel testing.
- Learn basic theory related to gas-phase spectroscopy that rely on either natural luminescence in reacting gases or laser-based excitation.
- Understand basic light-matter interactions including absorption, emission, and light-scattering.
- Receive an introduction on linear and nonlinear spectroscopy methods.
- Learn about the state-of-the-art technology available for optical measurements of reacting flows.
- Gain an appreciation for the complexities encountered when applying laser- and optical-based measurements for both ground-based testing and in-flight flow sensors.
- Spectroscopy Fundamentals:
- Advanced Laser Techniques:
- Laser absorption spectroscopy (LAS)
- Planar laser-induced fluorescence (PLIF)
- Coherent anti-Stokes Raman scattering (CARS)
- High speed lasers and applications:
- Fixed and tunable sources for various techniques
- Applications to high-speed reacting and non-reacting flows
- Implementation of diagnostic techniques in experimental hypersonic systems
Who Should Attend: Practicing engineers and graduate students involved with experimental hypersonic research. Program managers and technical area leaders responsible for future Hypersonics development.
AIAA MEMBER / GOVERNMENT EMPLOYEES (Early by March 29, 2022) – $299
AIAA MEMBER / GOVERNMENT EMPLOYEES (Standard) – $399
NON-MEMBER – $499