Rahman K Arafat, Patel Karna S, Slipchenko Mikhail N, Meyer Terrence R, Zhang Zhili, Wu Yue, Gord James R, Roy Sukesh
Appl Opt. 2018 Jul 10;57(20):5666-5671. doi: 10.1364/AO.57.005666.
Quantitative, kiloherz-rate measurement of carbon monoxide mole fractions by femtosecond two-photon, laser-induced fluorescence (TP-LIF) was demonstrated in high-pressure, luminous flames over a range of fuel-air ratios. Femtosecond excitation at 230.1 nm was used to pump CO two-photon rovibrational XΣ→BΣ transitions in the Hopfield-Birge system and avoid photolytic interferences with excitation irradiance ∼1.7×10 W/cm. The effects of excitation wavelength, detection scheme, and potential sources of de-excitation were also assessed to optimize the signal-to-background and signal-to-noise ratios and achieve excellent agreement with theoretically predicted CO mole fractions at low and high pressure.
通过飞秒双光子激光诱导荧光（TP-LIF）对一氧化碳摩尔分数进行千赫兹速率的定量测量，已在一系列燃料空气比的高压发光火焰中得到证实。在230.1 nm处的飞秒激发用于泵浦霍普菲尔德 - 伯奇系统中CO的双光子振转XΣ→BΣ跃迁，并避免激发辐照度约为1.7×10 W/cm时的光解干扰。还评估了激发波长、检测方案和去激发潜在源的影响，以优化信号与背景比和信噪比，并在低压和高压下与理论预测的CO摩尔分数实现极佳的一致性。
