Abstract
Laser-induced fluorescence spectroscopy (LIF) is being developed as an in-situ, real time diagnostic for polycyclic aromatic hydrocarbons (PCAH) in combustion systems. PCAH are known to be formed in sooting flames1,2 and are of interest both for their carcinogenic properties and possible role in the soot formation process. Gas chromatography and mass spectrometry have provided probe measurements of PCAH in flames; however, there is a need for a real time, non-intrusive technique for measurement of PCAH in combustion systems. Probe measurements have indicated individual PCAH concentrations in the 10 ppb to 10 ppm ranged3. LIF has been shown to be capable of detection of flame radicals at these concentrations4 and is expected to give similar limits for PCAH. The individual PCAH of interest include naphthalene, pyrene, fluoranthene, phenanthrene, anthracene, benzpyrene, and others. In a combustion environment many PCAH will be present in varying concentrations, so that detection of an individual species
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