Presented By: Aerospace Engineering
Chair's Distinguished Lecture: Optical Interactions with High-Speed Flows: From Hypersonic Boundary Layers to Aero-Optics
Dr. Chris Limbach
Assistant Professor
Department of Aerospace Engineering
Texas A&M University
Advances in high-energy and high repetition rate laser architectures have enabled new diagnostic approaches that can provide crucial insight into the hypersonic flow environment and data for model validation and improvement, especially for studies of complex, multi-dimensional shock-dominated flows and high-temperature thermochemistry. The first part of the seminar will focus on two hypersonic diagnostic techniques: femtosecond laser electronic excitation tagging and burst-mode filtered Rayleigh scattering. Both approaches are applied to study the wake flow and transition behind a boundary layer trip array in the Texas A&M actively controlled expansion tunnel at Mach 6. Then, preliminary measurements in a Mach 10 expansion tunnel will serve to highlight ongoing integration of optical and burst-mode laser diagnostics with impulse facilities, along with emerging diagnostic approaches.
The second part of the talk will feature aero-optics and the physics of light propagation through terrestrial, hypersonic, and rarefied flow environments. A new concept for space propulsion based on combined laser and atomic beam self-guiding will be presented, including recent theoretical and numerical results that demonstrate beam propagation beyond the diffraction limit. The talk will conclude by describing progress toward the realization of optomechanical self-guiding in small-scale experiments.
About the speaker...
Dr. Chris Limbach was born in Milwaukee, Wisconsin and graduated from the University of Arizona in 2009 with Bachelor’s degrees in Engineering Physics and Astronomy. He received his doctorate in Mechanical and Aerospace Engineering from Princeton University in 2015 where he studied energy deposition by nanosecond and femtosecond pulsed lasers with applications to hypersonic measurement and flow control. After holding a Research Scientist position at Colorado State University from 2016-2017, he joined Texas A&M University (TAMU) as an Assistant Professor of Aerospace Engineering in 2017 where he founded and now directs the Laser Diagnostics and Plasma Devices Laboratory (LDPDL). In 2017 he also received the Nakayama Award for Fluid Measurement and Visualization and in 2018 and 2019 was named a NASA Innovative Advanced Concepts Program Fellow.
Assistant Professor
Department of Aerospace Engineering
Texas A&M University
Advances in high-energy and high repetition rate laser architectures have enabled new diagnostic approaches that can provide crucial insight into the hypersonic flow environment and data for model validation and improvement, especially for studies of complex, multi-dimensional shock-dominated flows and high-temperature thermochemistry. The first part of the seminar will focus on two hypersonic diagnostic techniques: femtosecond laser electronic excitation tagging and burst-mode filtered Rayleigh scattering. Both approaches are applied to study the wake flow and transition behind a boundary layer trip array in the Texas A&M actively controlled expansion tunnel at Mach 6. Then, preliminary measurements in a Mach 10 expansion tunnel will serve to highlight ongoing integration of optical and burst-mode laser diagnostics with impulse facilities, along with emerging diagnostic approaches.
The second part of the talk will feature aero-optics and the physics of light propagation through terrestrial, hypersonic, and rarefied flow environments. A new concept for space propulsion based on combined laser and atomic beam self-guiding will be presented, including recent theoretical and numerical results that demonstrate beam propagation beyond the diffraction limit. The talk will conclude by describing progress toward the realization of optomechanical self-guiding in small-scale experiments.
About the speaker...
Dr. Chris Limbach was born in Milwaukee, Wisconsin and graduated from the University of Arizona in 2009 with Bachelor’s degrees in Engineering Physics and Astronomy. He received his doctorate in Mechanical and Aerospace Engineering from Princeton University in 2015 where he studied energy deposition by nanosecond and femtosecond pulsed lasers with applications to hypersonic measurement and flow control. After holding a Research Scientist position at Colorado State University from 2016-2017, he joined Texas A&M University (TAMU) as an Assistant Professor of Aerospace Engineering in 2017 where he founded and now directs the Laser Diagnostics and Plasma Devices Laboratory (LDPDL). In 2017 he also received the Nakayama Award for Fluid Measurement and Visualization and in 2018 and 2019 was named a NASA Innovative Advanced Concepts Program Fellow.
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