Study on the Concentration Measurement in a Liquid Jet by the Optical Fiber LIF Method
Study on the Concentration Measurement in a Liquid Jet by the Optical Fiber LIF Method
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光纤LIF法测量液体射流浓度的研究
DOI：
10.11395/jjsem.14.s30
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Yasumasa ITO
中科院分区：
文献类型：
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作者：
Toshiki TAKEICHI;Yasuhiko SAKAI;Osamu TERASHIMA;Kouji NAGATA;Yasumasa ITO
本研究发展了一种新的测量液体轴对称湍流射流中扩散物质浓度的技术，该技术基于带自聚焦透镜的光纤激光诱导荧光（LIF）方法。首先，利用双光纤测量液体射流中扩散物质的浓度。通过带聚光透镜的光纤将光斑直径为60 μm的激光发射到漫射物质上，并通过另一光纤测量荧光。其次，通过发射激光束并收集荧光的同一光纤来执行同一液体射流中的浓度测量。初步的校准测试表明，光电倍增管的输出电压与扩散物质的浓度线性增加的理论预测在这两种测量技术。此外，两种测量方法都能测量液体射流中的平均浓度和脉动浓度场，但从浓度脉动功率谱的结果来看，单光纤测量方法的测量精度更高。
In this study, new techniques for measuring the concentration of diffusing matter in a liquid axisymmetric turbulent jet is developed based on the laser-induced fluorescence (LIF) method using optical fibers with GRIN lens. Firstly, the concentration measurement of the diffusing matter in a liquid jet by means of two optical fibers is performed. A laser light whose beam spot diameter is 60 μm is emitted on the diffusing matter by means of an optical fiber with condenser lens and the fluorescence is measured by the other optical fiber. Secondly, the concentration measurement in the same liquid jet by means of the same optical fiber which emits the laser beam and collects the fluorescence is performed. Preliminary calibration tests show that the output voltage of the photomultiplier linearly increases with the concentration of the diffusing matter as theoretically predicted in both two measurement techniques. In addition, the mean concentration and fluctuating concentration field in a liquid jet can be measured in both two measurement techniques, whereas the measurement accuracy is better in the measurement with using only one optical fiber from the results of the power spectra of the concentration fluctuation.