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传统3ω非对称模型的研究应用仅限于液体材料的热物性测量,本文应用3ω非对称模型基本原理开发了新型微型探测器。讨论了基于该方法测量液体与固体的精度问题,并分析了探测器金属带宽度、谐波信号频率范围、不同接触介质等对测量结果的影响。通过开展探测器结构参数与应用过程的优化,本文拓展了传统3ω非对称模型法,使之能够测量普通固体材料热导率。测量过程兼备结果准确(6%)、周期短、样品体积小、可重复多次使用等优点。
The traditional application of 3ω asymmetric model is limited to the thermophysical properties measurement of liquid materials. In this paper, a new type of micro-detector is developed based on the basic principle of 3ω asymmetric model. The accuracy of liquid and solid based on this method is discussed. The influence of metal band width, frequency range of harmonic signal and different contact medium on the measurement results is analyzed. Through the optimization of detector structure parameters and application process, this paper expands the traditional 3ω asymmetric model method to make it possible to measure the thermal conductivity of ordinary solid materials. The measurement process has the advantages of accurate results (6%), short cycle, small sample size and repeated use.