Abstract

We demonstrate an all-fiber-coupled, UV, laser-induced-fluorescence (LIF) detection system of the hydroxyl radical (OH) in flames. The nanosecond-pulsed excitation of the (1,0) band of the OH A2+X2Π system at 283nm is followed by fluorescence detection from the (0,0) and (1,1) bands around 310nm. The excitation-laser beam is delivered through a 400μm core UV-grade optical fiber of up to 10m in length, and the fluorescence signal collected is transmitted through a 1.5mm core 3m long fiber onto the remote detector. Single-laser-shot planar LIF (PLIF) imaging of OH in flames is also demonstrated using fiber-based excitation. The effects of delivering intense UV beams through long optical fibers are investigated, and the system improvements for an all-fiber-coupled OH-PLIF imaging system are discussed. Development of such fiber-based diagnostics and imaging systems constitutes a major step in transitioning laser diagnostic tools from research laboratories to reacting flow facilities of practical interest.

© 2011 Optical Society of America

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