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Improving Speed and Precision of Using Guarded Heat Flow Technique to Measure Thin Specimens

机译:使用保护热流技术测量薄样品的速度和精度的提高

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摘要

The components and calculation formulas of guarded heat flow method (ASTM E1530) are simple,and at the same time this instrument is widely used to measure thermal resistance and conductivity of various materials.In contrast to other methods such as guarded hot plate technique,it is able to measure thin specimens.However,since thermal resistance of thin materials is small,the heat transfer through plates and specimen is very fast,which requires thermocouples of the instrument response rapidly.Also,the dynamic response delay of thermocouples extends the time to reach steady state.In the issue of measurement accuracy,on the other hand,the thermal contact resistance cannot be neglected and sometimes can even be many times larger than specimens'thermal resistance.This paper introduces a compensation algorithm and a different-layers calibration method to respectively focus on temperature measurement speed and thermal resistance elimination for the instrument.The experimental results have shown us that the precision and measurement speed of the instrument has been greatly improved by these methods.
机译:保护热流法(ASTM E1530)的组成和计算公式很简单,同时该仪器广泛用于测量各种材料的热阻和电导率。与保护热板法等其他方法相比,它能够测量薄的样品。但是,由于薄材料的热阻小,因此通过板和样品的热传递非常快,这需要热电偶对仪器的响应迅速。此外,热电偶的动态响应延迟将时间延长至另一方面,在测量精度的问题上,热接触电阻不能忽略,有时甚至比试样的热阻大很多倍。本文介绍了一种补偿算法和不同层的校准方法分别专注于仪器的温度测量速度和热阻消除。实验结果表明通过这些方法,我们可以大大提高仪器的精度和测量速度。

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