This work deals with the thermal characterisation of a low conductivity material of millimetre-sized used mainly in building insulation, the hemp shiv. Experimentally, the samples are positioned in a stainless steel chamber, in which it is possible to control the environment. They are heated during a few seconds on one side, and an infrared camera measures the temperature field of the sample surface. The experimental thermograms are compared with a theoretical estimation model derived from the fin model in order to estimate simultaneously two parameters by ordinary least-squares regression: the thermal diffusivity and a modified Biot number. This estimation procedure is applied to measure the thermal diffusivity of polycarbonate, balsa and hemp shiv. The influence of the surrounding environment (vacuum, air in natural or forced convection) is discussed.

这项工作针对的是主要用于建筑物隔热的低导电率毫米级低导热材料（大麻）。实验上，将样品放置在不锈钢腔室内，可以在其中控制环境。它们在一侧被加热几秒钟，然后红外摄像机测量样品表面的温度场。将实验热分析图与从fin模型导出的理论估计模型进行比较，以便通过普通的最小二乘回归同时估计两个参数：热扩散率和修正的比奥数。该估算程序适用于测量聚碳酸酯，轻木和大麻脂的热扩散率。周围环境的影响（真空，