SUBJECT: M.S. Thesis Presentation
BY: Carlos De La Camara Castillo
TIME: Wednesday, November 25, 2020, 11:00 a.m.
PLACE:, Online
TITLE: Reconstruction of Planar Fuel Concentration Measurements in a Diesel Spray from Line-Of-Sight Diffuse Back Illumination Imaging.
COMMITTEE: Dr. Caroline Genzale, Chair (ME)
Dr. Nico Declercq (ME)
Dr. Oleksandr Bibik (ME)


The main topic of this thesis is to evaluate the use of Abel inversion methods to reconstruct the planar fuel concentration field of a diesel spray using line-of-sight diffuse back-illumination imaging. The Abel transform enables reconstruction of planar data from line-of-sight imaging with just one viewing angle, which is a common limitation for imaging diagnostics applied to experiments under high-pressure and temperature environments. The technique enables cross-validation of data taken from both planar and line-of-sight imaging techniques. This thesis evaluates the sensitivities of the Abel inversion to noise, turbulent fluctuations and asymmetries in data sets and defines a methodology for accurate reconstruction of the planar field. The methodology developed is applied to validate the accuracy of a new optical diagnostic for fuel concentration measurements in a diesel spray known as Ultraviolet-Visible Diffuse Back-Illumination (UV-DBI) imaging. Ultimately, planar fields of fuel concentration are reconstructed from the UV-DBI measurements and are quantitatively validated against existing planar Rayleigh measurements of fuel concentration at matching experimental conditions.