Multipoint temperature measurements in gas flows using 1-D laser-induced grating scattering
Multipoint temperature measurements in gas flows using 1-D laser-induced grating scattering
复制标题
使用一维激光诱导光栅散射进行气流中的多点温度测量
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
P. Ewart
中科院分区：
文献类型：
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作者：
C. Willman;P. Ewart
报道了一种利用激光诱导热光栅散射（LITGS）从一维线上的四个点同时进行时间和空间分辨温度测量的技术。来自线上的四个独立点的信号，间隔1毫米，在甲苯接种的氮气流中，被成像到光纤阵列上，并被传送到单独的光电二极管检测器，以记录它们的时间演变，从每个点的温度在大气压力下以1毫米的空间分辨率和0.7%的精度导出。组合物的变化对测量的准确性的影响进行了补偿的校准方法提供良好的协议从热电偶测量推断的值。平行气流之间的边界处以及热表面和冷表面处的温度梯度以5 K mm−1的分辨率进行测量。扩展的技术，以更多的测量点和空间分辨率的改进进行了简要讨论。
A technique is reported for simultaneous, time- and space-resolved measurements of temperature using laser-induced thermal grating scattering, LITGS, from four points on a 1-D line. Signals from four separate points on the line, separated by 1 mm, in toluene-seeded nitrogen flows, were imaged onto a fibre-optic array and delivered to separate photodiode detectors to record their temporal evolution from which the temperatures at each point were derived with a spatial resolution of 1 mm and a precision of 0.7% at atmospheric pressure. Effects of variation of composition on the accuracy of the measurements were compensated by a calibration method providing good agreement with values inferred from thermocouple measurements. Temperature gradients at the boundary between parallel gas flows and at the surface of hot and cold surfaces were measured with a resolution of 5 K mm−1. Extension of the technique to more measurement points and improvements in spatial resolution are briefly discussed.