A volumetric temperature and velocity measurement technique for microfluidics based on luminescence lifetime imaging
A volumetric temperature and velocity measurement technique for microfluidics based on luminescence lifetime imaging
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DOI：
10.1007/s00348-018-2616-y
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发表时间：
2018-11-01
影响因子：
2.4
通讯作者：
Cierpka, Christian
中科院分区：
文献类型：
--
作者：
Massing, Julian;Kaehler, Christian J.;Cierpka, Christian
一种新的光学测量技术的介绍和资格，使同时确定的三维温度场和三维速度场的三个组成部分，在微流体应用中，只有一个相机。温度是通过评估个别发光聚合物颗粒的发射衰减，而速度场可以同时计算从流动引起的位移的个别粒子图像的时间。为了获得深度信息，采用了成熟的像散粒子跟踪测速技术。利用这种方法，可以避免体积照明和窗口平均的空间分辨率降低，由于在微粒图像测速（mu-PIV）或激光诱导荧光（LIF）的系统误差。该技术可以很容易地针对所研究的温度范围和流速进行优化，并提供极高的空间分辨率和精度。[图片]
A novel optical measurement technique is introduced and qualified which enables the simultaneous determination of the three-dimensional temperature field and the three components of the three-dimensional velocity field in microfluidic applications with only one camera. The temperature is obtained by evaluating the emission decay of individual luminescent polymer particles, whereas the velocity field can be calculated simultaneously from the flow-induced shift of individual particle images in time. To acquire the depth information, the well-established astigmatism particle-tracking velocimetry technique is employed. With this method, systematic errors caused by volume illumination and the reduced spatial resolution due to window averaging as in microparticle image velocimetry (mu-PIV)or laser-induced fluorescence (LIF)can be avoided. The technique can easily be optimized for the investigated temperature range and flow velocities and offers an exceptionally high spatial resolution and accuracy.[GRAPHICS]