Last Friday, Dr. Aman Satija gave a seminar over, “Development and Application of Laser Spectroscopy for Gas-Phase Diagnostics.” Dr. Satija is a Research Engineer at the Applied Laser Spectroscopy Lab at Purdue University.
Abstract: Laser diagnostics are employed in combustion and propulsion research due to their non-intrusiveness to the flow field, high-accuracy, and fast response time. Laser based techniques are used for measuring important flow parameters such as temperature, pressure, velocity and species concentration. Some laser methods, based on linear optical processes, such as absorption spectroscopy and particle image velocimetry have matured to an extent that they are commercially available and are being actively used in the industry. In this seminar, Dr. Satija will provide a survey of his research in quantitative non-linear spectroscopic methods and high-repetition rate diagnostics. He will: a) discuss the similarities and differences between various types of nanosecond coherent anti-Stokes Raman scattering (CARS) methods along with some applications b) present recent developments in chirped-probe-pulse femtosecond CARS for 5 kHz thermometry c) describe the principle of polarization spectroscopy and present its application towards measurement of minor species in reacting flows d) discuss progress of high-average power high-repetition lasers and present examples of high-repetition rate diagnostics in turbulent atmospheric and high- pressure combustion and e) comment on the challenges and opportunities of quantum modeling of nonlinear light-matter interaction in context of atoms and small molecules.
Bio: Aman Satija is currently a research engineer at the Applied Laser Spectroscopy Lab at Purdue University. His research interests include spectroscopy, photonics, combustion and fluid mechanics. His expertise is in the development of laser-based techniques and tools and their application to gas-phase environments. He has applied linear and non-linear spectroscopic techniques in a variety of applications including laminar flames, turbulent flames and plasmas. Aman received B.E in Mechanical Engineering from the Army Institute of Technology, Pune University in 2002, M. Sc. in Aerospace Engineering from Auburn University in 2007 and Ph. D. in Mechanical Engineering from Purdue University in 2013.