Miao Tingting, Ma Weigang, Zhang Xing, Li Zhen
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing, People's Republic of China.
Rev Sci Instrum. 2011 Feb;82(2):024901. doi: 10.1063/1.3544019.
A novel and reliable self-heating 2ω method has been developed to measure the Seebeck coefficient of the microscale/nanoscale thermoelectric materials. Based on the analytical solution of the transient heat-conduction equation of the specimen heated by a harmonic current, two measurement modes have been developed: (1) the Seebeck coefficient can be directly extracted from the ratio of experimentally measured 2ω Seebeck voltage to theoretically predicted 2ω temperature drop oscillation; and (2) the Seebeck coefficient can be steadily extracted from the measured 2ω and 3ω voltages. This approach has been applied to a 25.4 μm thick K-type thermocouple and the measured Seebeck coefficient corresponds well with the nominal value.
一种新颖且可靠的自热式2ω方法已被开发出来，用于测量微纳尺度热电材料的塞贝克系数。基于由谐波电流加热的试样的瞬态热传导方程的解析解，开发了两种测量模式：（1）塞贝克系数可直接从实验测量的2ω塞贝克电压与理论预测的2ω温度降振荡的比值中提取；（2）塞贝克系数可从测量的2ω和3ω电压中稳定提取。该方法已应用于厚度为25.4μm的K型热电偶，测量得到的塞贝克系数与标称值吻合良好。
