Advanced diagnostics for reacting flows

Progress is reported for the fourth year of an interdisciplinary program to innovate modern diagnostic techniques applicable to reacting and plasma flows. Research topics include: (1) fiber optic absorption/fluorescence sensors employing tunable ultraviolet, visible and infrared laser sources for species measurements; (2) wavelength-modulation spectroscopy, using rapid-scanning ultraviolet, visible and infrared laser sources, for absorption and fluorescence measurements of species, temperature and absorption lineshapes; (3) quantitative flow visualization, including temporally and spatially resolved species and temperature measurements in a plane, using laser-induced fluorescence; (4) quantitative particle visualization in spray flames using Mie scattering; (5) multiple-point velocity visualization; (6) advanced solid-state camera/computer systems for high speed and high-resolution recording, processing and display of flow visualization data; (7) plasma diagnostics, utilizing planar laser-induced fluorescence and wavelength modulation techniques; (8) optical processing and phase conjugation studies; and (9) investigation of other new diagnostic concepts.