Abstract

Two-dimensional imaging of CO distributions in combustion gases is demonstrated using planar laser-induced fluorescence. The illumination technique is based on the combination of a nonlinear absorption scheme, in which two photons at 230.1 nm excite several rotational transitions of the B1+X1+ system, and the use of an ultraviolet multipass cell for producing the laser sheet. The subsequent visible fluorescence (B1+A 1Π) is imaged onto an intensified two-dimensional photodiode array. Experimental results are presented for carbon monoxide–air and methane–air flames.

© 1986 Optical Society of America

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