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Fuel vapor measurements by linear Raman spectroscopy using spectral discrimination from droplet interferences

机译:通过线性拉曼光谱法对燃油蒸气进行测量,并利用对液滴干扰的光谱判别

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摘要

Vapor-phase measurements by linear Raman spectroscopy are performed in the vicinity of methanol droplets. Several types of interference by these droplets are identified and removed by appropriate filtering. This procedure, together with the phase-dependent spectral shift of the OH stretching vibration frequency, is proved to permit single-pulse linear Raman measurements of methanol vapor and nitrogen on a line with coexisting droplets. Laser-induced droplet breakdown is found to limit the applicable laser irradiance to approximately 2 GW/cm~(2) and is avoided by use of a flash-lamp-pumped dye laser with high energy (1-7 J) and long pulses (1.5 μs).
机译:通过线性拉曼光谱的汽相测量在甲醇液滴附近进行。通过适当的过滤可以识别并消除这些液滴产生的几种干扰。事实证明,该程序与OH拉伸振动频率的相位相关频谱偏移一起,可以在共存液滴线上对甲醇蒸气和氮气进行单脉冲线性拉曼测量。发现激光诱导的液滴击穿将适用的激光辐照度限制在大约2 GW / cm〜(2),并通过使用具有高能量(1-7 J)和长脉冲( 1.5μs)。

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