A novel calibration method for an infrared thermography system applied to heat transfer experiments
A novel calibration method for an infrared thermography system applied to heat transfer experiments
复制标题
传热实验红外热成像系统的新型标定方法
DOI：
10.1088/0957-0233/20/7/075103
复制
发表时间：
2009
影响因子：
2.4
通讯作者：
H. Bauer
中科院分区：
文献类型：
--
作者：
M. Ochs;T. Horbach;A. Schulz;R. Koch;H. Bauer
在壁面热流密度高度不均匀的换热测量中，需要高空间分辨率的壁面温度才能完全捕捉到复杂的热状况。红外热像仪系统提供了这种空间分辨率。为了满足热精度，通常使用嵌入测试表面的热电偶进行现场校准，热电偶必须覆盖感兴趣的整个温度范围。然而，放置在温度和热流密度梯度较高的区域的热电偶往往不能用于校准，校准的总体精度显著下降。因此，在本工作中，提出了一种不需要在整个表面温度范围内使用热电偶的新型现场校准方法。通过优化系统对操作条件的改变的不敏感度来减少校准函数的自由参数的数量。参考测量结果表明了新方法的优越性。
In heat transfer measurements with highly non-uniform wall heat fluxes, high spatial resolution of wall temperatures is required to fully capture the complex thermal situation. Infrared thermography systems provide that spatial resolution. To meet the thermal accuracy, they are usually calibrated in situ using thermocouples embedded in the test surface, which have to cover the complete temperature range of interest. However, thermocouples which are placed in regions of high temperature and heat flux gradients often cannot be used for the calibration and the overall accuracy of the calibration decreases significantly. Therefore, in the present work a novel in situ calibration method is presented which does not require thermocouples over the complete surface temperature range. The number of free parameters of the calibration function is reduced by an optimized insensitivity of the system with respect to changes in operating conditions. Reference measurements demonstrate the advantages of the new method.