Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 124, Issue 3, Pages -Publisher
SPRINGER
DOI: 10.1007/s00340-018-6912-2
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Funding
- Engineering and Physical Sciences Research Council (UK) [EP/K02924X/1]
- EPSRC [EP/K02924X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1355817, EP/K02924X/1] Funding Source: researchfish
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A systematic study of laser-induced thermal-grating scattering (LITGS) using nitric oxide as an absorbing species is presented as a means of thermometry in air-fed combustion. The relative contributions to the scattered signal from degenerate four-wave mixing, DFWM, and from laser-induced thermal-grating scattering, LITGS, are studied in the time domain for NO in N-2 buffer gas up to 4 bar, using a pulsed laser system to excite the (0,0) gamma-bands of NO at 226.21 nm. LITGS signals from combustion-generated NO in a laminar, pre-mixed CH4/O-2/N-2 flame on an in-house constructed slot burner were used to derive temperature values as a function of O-2 concentration and position in the flame at 1 and 2.5 bar total pressure. Temperature values consistent with the calculated adiabatic flame temperature were derived from averaged LITGS signals over 50-100 single shots at 10 Hz repetition rate in the range 1600-2400 K with a pressure-dependent uncertainty of +/- 1.8% at 1 bar to +/- 1.4% at 2.5 bar. Based on observed signal-to-noise ratios, the minimum detectable concentration of NO in the flame is estimated to be 80 ppm for a 5 s measurement time at 10 Hz repetition rate.
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