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Development simultaneous of a simultaneous measurement system of temperature and concentration fields and effect of double-diffusive convection on crystallization

温度场、浓度场同时测量系统的研制及双扩散对流对结晶的影响

基本信息

批准号：
13650808
负责人：
YOSHIDA Masamichi
金额：
$ 1.79万
依托单位：
Toyama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

In order to illustrate the mechanism of double-diffusive convection generated in the system with which heat convection and solutal convection coexist, a basic study was performed to develop a simultaneous measurement system of temperature and concentration fields using He-Ne laser holographic interferometry (HI) in combination with Ar laser-induced fluorescence (LIF).First, HI was applied to the double-diffusive convection and calculation of local concentration was tried from the interference fringes obtained Following facts were employed that interference fringe agree with contour lines of reflective index, and that both temperature and concentration influence reflective index. As s result, local concentrations at given times in a quasi-steady state were determined using interference fringe and measured local temperatures. The concentration obtained from interference fringes was appropriate.From the above-mentioned result, when a temperature field is obtained, a concentration field can be predicted. Therefore, for the purpose of development of techniques obtaining the temperature field, the visualization of temperature field in a liquid phase using LIF was performed. Through the analysis of the tristimulus values (RGB) of the fluorescence image, it was found that the change in the brightness of reel is linear with temperature. The quantification of LIF images became possible by using this relation.When the concentration field was measured for the system with stable temperature and concentration, it was measurable with ±5% of error.

为了阐明热对流和溶质对流共存体系中双扩散对流的产生机理，开展了He-Ne激光全息干涉（HI）与Ar激光诱导荧光（LIF）相结合的温度场和浓度场同时测量系统的基础研究。本文将HI应用于双扩散对流，并尝试由干涉条纹计算局部浓度。利用干涉条纹与折射率等值线一致的事实，温度和浓度都影响反射率。结果表明，在准稳态下，利用干涉条纹和测量的局部温度确定了给定时间的局部浓度。由干涉条纹得到的浓度是合适的，由上述结果可以在得到温度场的同时预测浓度场。因此，为了开发获得温度场的技术，进行了使用LIF的液相中的温度场的可视化。通过对荧光图像的三刺激值（RGB）的分析，发现卷轴亮度的变化与温度呈线性关系。利用这一关系，可以对激光诱导荧光图像进行定量分析，在温度和浓度稳定的情况下，测量浓度场时，测量误差为±5%。