Measurement of water film thickness by laser-induced fluorescence and Raman imaging
Measurement of water film thickness by laser-induced fluorescence and Raman imaging
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DOI：
10.1007/s00340-010-4200-x
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发表时间：
2011-01-01
影响因子：
2.1
通讯作者：
Schulz, C.
中科院分区：
文献类型：
--
作者：
Greszik, D.;Yang, H.;Schulz, C.
我们提出了两种非侵入式，基于激光的成像技术的定量测量水流体膜厚度。的诊断方法是基于激光诱导荧光（LIF）的有机示踪剂乙酰乙酸乙酯添加到液体中的分百分比（按质量计）的浓度水平，并在自发的拉曼散射的液体水，分别与激发在266 nm。信号强度用在0和500 μ m之间的范围内的已知厚度的液体层上的测量来校准。通过图像倍增器和适当的过滤在两个光路中的检测，使两种方法的二维液体膜厚度信息的同时检测。在透明石英玻璃板上的水膜的厚度被确定为9%的示踪LIF和15%的拉曼散射技术的准确度，分别。组合的LIF/拉曼测量也揭示了优先蒸发的电流示踪剂在时间分辨记录薄膜蒸发。
We present two non-intrusive, laser-based imaging techniques for the quantitative measurement of water fluid film thickness. The diagnostics methods are based on laser-induced fluorescence (LIF) of the organic tracer ethyl acetoacetate added to the liquid in sub-percent (by mass) concentration levels, and on spontaneous Raman scattering of liquid water, respectively, both with excitation at 266 nm. Signal intensities were calibrated with measurements on liquid layers of known thickness in a range between 0 and 500 mu m. Detection via an image doubler and appropriate filtering in both light paths enabled the simultaneous detection of two-dimensional liquid film thickness information from both methods. The thickness of water films on transparent quartz glass plates was determined with an accuracy of 9% for the tracer LIF and 15% for the Raman scattering technique, respectively. The combined LIF/Raman measurements also revealed a preferential evaporation of the current tracer during the time-resolved recording of film evaporation.