Non-intrusive measurement of microscale temperature distribution by spontaneous Raman imaging
Non-intrusive measurement of microscale temperature distribution by spontaneous Raman imaging
复制标题
通过自发拉曼成像非侵入式测量微尺度温度分布
DOI：
10.1007/s10404-012-1110-8
复制
发表时间：
2013
影响因子：
2.8
通讯作者：
Yohei SATO
中科院分区：
文献类型：
--
作者：
Reiko KURIYAMA;Yohei SATO
提出了一种基于自发拉曼成像的非侵入式空间分辨温度测量技术，用于测量微流体系统中的二维温度分布。利用H2O分子OH拉伸振动引起的拉曼散射对温度的高灵敏度来测量局部通道流动温度。氢氧根拉伸带有两种不同的温度依赖模式：氢键模式（HB）和非氢键模式（NHB）。利用中心波长分别为642 nm和660 nm的两个带通滤波器，利用电子倍增电荷耦合器件相机分别捕获HB和NHB模式的拉曼图像。通过标定曲线得到两幅图像的二维温度分布，结果表明，在293 ~ 333 K范围内，温度与HB模式与NHB模式的强度比呈线性关系。在由聚二甲基硅氧烷芯片和硼硅玻璃载玻片组成的at型通道的交界区进行了混合流场的温度分布测量。在12.8 × 12.8 μm2的空间分辨率下，定量显示了三种不同加热条件下的非均匀温度分布。
A non-intrusive and spatially resolved temperature measurement technique based on spontaneous Raman imaging was developed to measure two-dimensional temperature distributions in microfluidic systems. Raman scattering arising from OH stretching vibrations of H2O molecules was used to measure the local channel flow temperature because of its high sensitivity to temperature. The OH stretching band has two parts with contrasting temperature dependences: hydrogen-bonded (HB) and non-hydrogen-bonded (NHB) modes. Raman images of HB and NHB modes were separately captured by an electron-multiplying charge-coupled device camera using two bandpass filters with center wavelengths of 642 and 660 nm, respectively. The two-dimensional temperature distributions were obtained from the intensity ratio of the two images by applying a calibration curve, which showed that there was a linear relationship between the temperature and the intensity ratio of HB to NHB modes for temperatures in the range 293–333 K. Temperature distribution measurements were demonstrated in the mixing flow field in the junction area of aT-shaped channel composed of a poly(dimethylsiloxane) chip and borosilicate glass slides. Non-uniform temperature distributions were quantitatively visualized at a spatial resolution of 12.8 × 12.8 μm2for three different heating conditions.