Transient detection of hydrogen atoms in flames based on cooperative multiphoton-induced fluorescence with femtosecond and nanosecond lasers
In order to accurately measure in-situ hydrogen atoms during the combustion process of hydrocarbon fu-els,this paper proposes a strategy for transient online detection of hydrogen atoms using a femtosecond-nanosecond laser co-excitation method.In this approach,hydrogen atoms in the ground state are excited to the 2S level through a two-pho-ton process using a 243 nm femtosecond laser.Subsequently,these hydrogen atoms are further excited to the 3P level by a 656 nm nanosecond laser,and the fluorescence emission from the 3P-2S transition is detected,enabling interference-free transient online measurement of hydrogen atoms over a wide equivalence ratio range.Experimental results demonstrate that the femtosecond-nanosecond co-excitation method effectively reduces the interference of hydrogen atoms produced by laser photolysis on the detection of in-situ hydrogen atoms.
hydrogen atom measurementfemtosecond laserlaser-induced fluorescenceonline measurement
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