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全内反射测速技术(TIRV)中界面隐失波基准光强I_0的确定
Determination of the interfacial evanescent wave base intensity I_0 in total internal reflection velocimetry (TIRV)

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史飞 1   郑旭 2   陈荣前 1   李战华 2 *  
文摘 基于隐失波全内反射的测速技术TIRV (Total internal reflection velocimetry)是微纳流动中测量壁面附近几百纳米范围内速度的有效方法。隐失波的光强分布I(z)随离开壁面的高度z指数衰减。若荧光粒子位于光强分布中,其亮度也将符合此指数关系,通过测量粒子亮度可确定粒子的垂向位置z,而确定隐失波的基准光强I_0是该技术的关键之一。基于粒子近壁Boltzmann浓度分布、粒子粒径不均匀性和隐失波光强公式,给出了粒子亮度概率密度分布的数值解。实验测量粒子统计亮度分布后,依据实验和理论分布相同原则可定量确定基准光强I_0。采用φ100nm和φ250nm荧光粒子验证此方法并定量分析了粒径分散性对确定I_0的影响。进一步采用φ100nm粒子进行近壁速度测量实验,结果验证了本方法的有效性。
其他语种文摘 The total internal reflection velocimetry (TIRV) based on evanescent wave is an efficient method for velocity measurement within a few hundred nanometers to the wall. The evanescent wave intensity, I(z), decays exponentially with the distance z away from the wall. When a nanotracer located in this field is illuminated by evanescent wave, its radiation intensity will also obey the exponential decay low, and thus it is possible to determine the nanotracer’s z position by its illuminated intensity. Obviously, one of the key issues of this technology is to determine the base intensity I_0. In this paper, a numerical solution of the nanotracer intensity probability density function is given to predict the intensity distribution according to the exponential decay of the evanescent wave, the tracer concentration distribution and the tracer size variation. By comparing the measured intensity distribution with the theoretical prediction, the base intensity I_0 can be quantitatively determined. Fluorescent polystyrene spheres of φ100nm and φ250nm are used in the measurements. The validity of this method is verified. The effect of the nanotracer size variation on the determination of I_0 is also analyzed. Furthermore, φ100nm nanotracers are used to measure the velocity close to the wall, and the result verifies the validity of our method.
来源 实验流体力学 ,2014,28(6):80-85 【核心库】
DOI 10.11729/syltlx20140048
关键词 全内反射测速技术(TIRV) ; 隐失波 ; 基准光强 ; 纳米粒子 ; 亮度分布
地址

1. 中国计量学院计量测试工程学院, 杭州, 310018  

2. 中国科学院力学研究所, 北京, 100190

语种 中文
文献类型 研究性论文
ISSN 1672-9897
学科 力学
基金 国家自然科学基金
文献收藏号 CSCD:5317907

参考文献 共 13 共1页

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1 王涵 高斯光束通过颗粒系统的衰减特征 上海大学学报. 自然科学版,2018,24(3):392-401
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