Scalar concentration measurements in liquid-phase flows with pulsed lasers
Scalar concentration measurements in liquid-phase flows with pulsed lasers
复制标题
使用脉冲激光测量液相流中的标量浓度
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
P. Dimotakis
中科院分区：
文献类型：
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作者：
J. Shan;D. Lang;P. Dimotakis
研究了脉冲激光用于液相流中标量局部浓度的激光诱导荧光（LIF）测量的适用性。用调Q倍频Nd：YAG激光器激发罗丹明-6G氯化物水溶液，测量了其荧光强度。荧光强度与染料浓度呈线性关系，但与照明功率密度不成线性关系。荧光强度在激光功率密度下饱和，很容易被短脉冲持续时间激光超过。讨论了一种仅依赖于弱吸收和荧光强度与浓度的线性关系的校准和归一化原始图像数据的程序。该过程能够利用脉冲激光诱导荧光进行定量浓度测量。
The suitability of pulsed lasers for laser-induced-fluorescence (LIF) measurements of the local concentration of scalars in liquid-phase flows is investigated. Experiments were performed to measure the fluorescence intensity of aqueous solutions of rhodamine-6G chloride excited by a Q-switched, frequency-doubled, Nd:YAG laser. The fluorescence intensity is found to be linear with dye concentration, but not with illumination power density. The fluorescence intensity saturates at laser power densities easily exceeded by short-pulse-duration lasers. A procedure for calibrating and normalizing the raw image data is discussed which relies only on weak absorption and the linearity of fluorescence intensity with concentration. This procedure enables quantitative concentration measurement with pulsed-laser-induced fluorescence.