Abstract
In this paper, we describe the application of diode-laser continuous-wave cavity ring-down spectroscopy (cw-CRDS) to in-situ flame diagnostics. Spectra of the P17e acetylene feature at 1535.4 nm were recorded in a premixed laminar ethylene/air flame. The overall absorption of the feature was measured to be $\approx\!\!1.5\times 10^{-4} \text{cm}^{-1}$ , which is a short distance above the reaction zone for a flame fuel equivalence ratio of 1.66, and the minimum detection limit $(3\sigma)$ of the system was calculated to be $1.2\times 10^{-5} \text{cm}^{-1}$ . This demonstrates the potential of the technique for the measurement of weakly absorbing species in flames. Finally, we discuss the advantages and limitations of the cw-CRDS technique for flame measurements.
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