Abstract: The new developed laser-Raman method was used to measure the thermal conductivity of individual carbon fiber at 333.15 K. The local temperature along the individual fiber was determined by Raman shift. The measuring result without concerning thermal contact resistance is 110.6 W·m^-1·K^-1，which fits well with data from direct-current method. Then the method is made better. By changing laser heating spot, the thermal contact resistance is determined. And then the intrinsic thermal conductivity is determined to be 135.0 W·m^-1·K^-1 by concerning the thermal contact resistance. Moreover, by changing laser heating power the laser absorptivity is determined. And when the fiber is being heated in the air, the convective heat transfer coefficient is obtained by iterative solution.

Key words: microscale, carbon fiber, laser, Raman, heat conduction, thermal conductivity, thermal contact resistance, convection

摘要： 主要完善并利用新近提出的激光拉曼测试方法，在333.15 K环境温度下测量了单根碳纤维的热导率（不考虑接触热阻），并与直流通电法测量结果进行比较，两者符合较好，验证了新提出的激光拉曼测量方法的可行性。同时激光拉曼方法还测量得到了接触热阻、碳纤维的激光吸收率及与空气的对流传热系数，并处理得到考虑接触热阻后修正的碳纤维真实热导率。

关键词: 微尺度, 碳纤维, 激光, 拉曼, 热传导, 热导率, 接触热阻, 对流