File(s) under embargo

Reason: Some content is still in the publication process

7

month(s)

8

day(s)

until file(s) become available

Ultrafast laser-absorption spectroscopy in the mid-infrared for spatiotemporally resolved measurements of gas properties

thesis
posted on 27.04.2021, 19:28 by Ryan J TancinRyan J Tancin
Laser-absorption spectroscopy (LAS) is widely used for providing non-intrusive and quantitative measurements of gas properties (such as temperature and absorbing species mole fraction) in combustion environments. However, challenges may arise from the line-of-sight nature of LAS diagnostics, which can limit their spatial resolution. Further, time-resolution of such techniques as scanned direct-absorption or wavelength-modulation spectroscopy is limited by the scanning speed of the laser and the optical bandwidth is often limited by a combination of a laser's intrinsic tunability and its scanning speed. The work presented in this dissertation investigated how recent advancements in mid-IR camera technology and lasers can be leveraged to expand the spatial, temporal, and spectral measurement capabilities of LAS diagnostics. Novel laser-absorption imaging and ultrafast laser-absorption spectroscopy diagnostics are presented in this dissertation. In addition, the high-pressure combustion chamber (HPCC) and high-pressure shock tube (HPST) were designed and built to enable the study of, among others, energetic material combustion, spectroscopy, non-equilibrium and chemistry using optical diagnostics.

Funding

FA9550-18-1-0210

CBET Grant 1834972

History

Degree Type

Doctor of Philosophy

Department

Aeronautics and Astronautics

Campus location

West Lafayette

Advisor/Supervisor/Committee Chair

Christopher S. Goldenstein

Additional Committee Member 2

Steven F. Son

Additional Committee Member 3

Terrance R. Meyer

Additional Committee Member 4

Robert P. Lucht