Femtosecond laser-induced plasma spectroscopy (FLIPS) was performed to achieve full-range mixture fraction measurements in non-reacting CH4/air flow fields. A femtosecond laser at 800 nm was used to generate a plasma channel with a uniform intensity distribution. Through measuring spatially resolved spectra and calibration, we found that the spectral intensity ratios of CH (431 nm)/N2 (337 nm), CH (431 nm)/N2 (357 nm), C2 (516.5 nm)/N2 (337 nm), C2 (516.5 nm)/N2 (357 nm) and CH (431 nm)/O (777 nm) could be used to realize mixture fraction measurements, and the first four intensity ratios can achieve full-range mixture fraction measurements. Furthermore, through quantitative analysis of the distribution along the plasma channel, we analyzed the one-dimensional measurement capability of FLIPS. The main advantages of FLIPS for mixture fraction measurements are one-dimensional quantitative measurement, full-range measurement, high spatial resolution and no Bremsstrahlung interference.
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Li, B., Zhang, D., Gao, Q. et al. One-dimensional full-range mixture fraction measurements with femtosecond laser-induced plasma spectroscopy. Exp Fluids 61, 33 (2020). https://doi.org/10.1007/s00348-020-2877-0