基于COSM的微通道非侵入式三维温度场测量.docVIP

 基于 COSM 的微通道非侵入式三维温度场 测量# * 5 10 15 20 25 30 35 40  摘要：微流体温度的测量对理解微尺度下流体的状态和传热特性具有重要意义。提出了基于 计算光学分层显微成像法与激光诱导荧光测温法相结合的方法对微通道三维温度场进行了 测量。包含 RhB 和 SR101 染料溶液的三维荧光发光体可看成若干个二维发光断层的组合， 利用两台 CCD 同时逐层聚焦拍摄各二维断层的像，利用图像反演算法可复原出各断层原始 的光强分布。选用温度敏感的染料溶液 (RhB) 和温度不敏感的染料溶液 (SR101) 以消除激 发光强度波动对测量值的影响。提出采用大通道代替小通道进行温度标定的方法，减小了微 通道三维温度场分布不均对标定结果的影响，获取了荧光染料在不同光谱段的积分光强比值 与溶液温度的标定关系，实现了微通道三维温度场的重建。 关键词：工程热物理；微尺度流动；非侵入式；计算光学分层显微成像技术；三维温度场重 建 中图分类号：TK 311 Non-invasive 3D Temperature Field Measurement of Micro-channel Using COSM Zhou Bin (Institute of Space Science and Technology, Southeast University, Nanjing 210096) Abstract: The temperature measurements of microfluidics is of great significance in understanding the micro-flow and heat transfer characteristics. The technology based on Computational Optical Sectioning Microscopy (COSM) method combine with Laser-induced Fluorescence (LIF) thermometry is put forward to measure the 3D temperature field in micro-channel. The 3D fluorescence irradiance of dyes mixture solution (Rhodamine B (RhB) and Sulforhodamine-101 (SR101)) can be regarded as a combination of a set of 2D luminous sections. Focusing on each 2D section and taking photos synchronously using two CCD cameras layer by layer, the original luminosity distribution of each section can be retrieved using the image inversion algorithm. Temperature-sensitive fluorescent dye (RhB) and temperature-insensitive fluorescent dye (SR101) are selected in tend to eliminate the effect caused by fluctuation of illuminating intensity. A temperature calibration method is put forward, and the influence of calibration results caused by uneven distribution of 3D temperature field in micro-channel is reduced. The calibration relationship between the ratio of intensities in different spectral bands and temperature is acquired, and the reconstruction of 3D temperature field is realized. Key words: thermal engineering; microscale flow; non-invasive; COSM; three-dimensional temperature field reconstr