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Abstract: This work introduces a specifically designed sensor to measure the thermal conductivity of thin, insulating materials. This sensor, referred to as the hot square sensor, is unlike the standard Hot Disk sensors, in the sense that it is square in nature, and does not have two, thin layers of Kapton insulation on either side of the thin, metal heating spiral. The lack of Kapton allows a good thermal contact between the sample and sensor, providing better and more accurate results. Previous research had determined that a thick layer of insulation around the heating spiral, in sensors such as the Hot Strip, can have an influence on the thermal conductivity measurements of relatively thin insulating materials.

Reference: Thermal Conductivity 24 Thermal Expansion 12