LIBS法による炭化水素混合気の高速局所当量比計測 : 熱工学,内燃機関,動力など

概要

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A new method for measuring local equivalence ratios in hydrocarbon mixture fields was established with an application of LIBS, Laser-Induced Breakdown Spectroscopy. Gas molecules of the mixture were separated to excited atoms by introducing the focused lights of Nd, YAG laser, to obtain atomic emissions from the excited atoms. The emission peaks of H, O, and N were observed at different wavelengths. The wavelengths for their representative peaks include 656 nm, 777 nm, and 871 nm respectively. The ratios of the emission intensity from H and O, F_H/F_N, or from H and N, F_H/F_N had a good correlation to the equivalence ratios, regardless of the laser power. The experimental results showed that local equivalence ratios above 0.01 thereabout were measured instantaneously and with high accuracy for propane-air mixtures.
2001-06-25