The reduction of device components is of a major interest for the conception of low-cost devices with a simple design. Generally, the boxes method measures the effective thermal conductivity of relatively large-sized samples due to its industrial purposes. However, to determine the thermal conductivity of small samples, additional sensors are required. In this work, a new experimental procedure is developed to characterize the thermal conductivity of small samples without any additional sensor. A detailed uncertainty analysis in the thermal conductivity measurements is conducted. The improvement of the instrument uncertainty was also considered. Three different scenarios were examined, from ideal to worst-case, in order to assess the performance of the proposed methodology. The values of the measured thermal conductivity were compared with those obtained by a reference method (hot disk). The comparison shows a good agreement and proves the effectiveness of the used technique. The overall study of the propagation of measurement uncertainties shows that the instrument’s uncertainty was found to be less than 6.1 %.

中文翻译：

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使用带简化传感器的盒法测量小样品热导率的新方法

设备组件的减少对于具有简单设计的低成本设备的概念具有重要意义。通常，由于其工业用途，盒子法测量较大尺寸样品的有效热导率。然而，为了确定小样品的热导率，需要额外的传感器。在这项工作中，开发了一种新的实验程序来表征小样品的热导率，而无需任何额外的传感器。在热导率测量中进行了详细的不确定性分析。还考虑了仪器不确定度的改进。从理想情况到最坏情况，研究了三种不同的情况，以评估所提出方法的性能。将测得的热导率值与通过参考方法（热盘）获得的值进行比较。比较显示出良好的一致性，并证明了所用技术的有效性。对测量不确定度传播的总体研究表明，发现仪器的不确定度小于 6.1%。