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中文摘要：
本文设计了用于测量高分子聚合物热导率的改良3ω方法。采用热压的方法将作为加热源和温度传感器的自金（Pt）丝压入待测材料中，利用基于LabVIEW设计的虚拟数字锁相放大技术采集热线两端的3ω电压信号。分析了系统中直流变阻箱感抗对测量结果的影响，在此基础上设计了不加变阻箱的测试系统，简化系统的同时提高了系统在高频下的适用性。最后，利用改进前后的系统在室温下测量了五种高分子聚合物的热导率，测试结果与参考文献值吻合较好，验证了两套系统的可行性。
英文摘要：
In this study, an improved 3ω method is designed to measure the thermal conductivities of polymers. During the measurement, a platinum hot wire （Pt）, served as a heater/sensor, is pressed into tested polymers at the molten state. A LabVIEW-based virtual digital lock-in amplifier is built to collect the third harmonic of the voltage. Furthermore, a phase error caused by the self-inductance of the direct current （DC） resistor is discussed, and based on that, a simpler system without the DC resistor is developed to enhance its accuracy in high frequency measurement. Finally, to verify the capability of the measurement systems, five kinds of commercial polymers are measured at the room temperature. The results of the system with and without the DC resistor are both in a good agreement with those obtained by using other conventional techniques.
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