Application of continuous-wave cavity ring-down spectroscopy to laminar flames

Gordon S. Humphries, Iain S. Burns, Michael Lengden

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5 Citations (Scopus)
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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 ≈ 1.5×10−4 cm−1 a short distance above the reaction zone for a flame fuel equivalence ratio of 1.66, and the minimum detection limit (3σ) of the system was calculated to be1.2×10−5 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.
Original languageEnglish
Article number3900110
Number of pages10
JournalIEEE Photonics Journal
Issue number1
Early online date12 Jan 2016
Publication statusE-pub ahead of print - 12 Jan 2016


  • cw-CRDS
  • combustion
  • cavity ring-down
  • diode laser


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