Abstract

A calibration technique for OH laser-induced fluorescence (LIF) density measurements through the use of the thermal dissociation of ambient H₂O in an atmospheric air furnace with a tunable KrF laser has been demonstrated. The stable and uniform concentration of OH produced in the furnace permits direct calibration of LIF signals without the uncertainties associated with reference flames. The presence of OH in atmospheric air that is heated to temperatures exceeding 1500 K is sufficient for LIF measurements with most OH LIF laser systems. The measured OH density is found to agree well with the computed OH chemical-equilibrium density over a temperature range of 1500–1850 K.

© 1994 Optical Society of America

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