摘要
介绍了一种利用热扫描技术测量低温热导率的新方法。实验利用计算机自动采集数据并实时处理给出测量结果,测量温度范围为10 K-300 K。热扫描方法降低了各种漏热影响,修正了因温差测量的困难而带来的实验误差。通过金属铜、铝的测量值与标准数据的比较,发现10 K-300K范围有较好的吻合,相对误差小于5%,温度越低,误差越小。
Using the heat-scanning technique, a new method to measure thermal conductivity of solid materials at low temperature was introduced. Experiment data were collected and processed automatically by computer basing on digital communication interface. Sample temperature was controlled from 10 K to 300 K. The influence of heat leakage was weakened and the error resulted from temperature difference measurement was corrected with this method. The thermal conductivities of commercial copper and aluminum at the temperature range from 10 K to 300 K were measured. The results showed that the relative errors comparing with the standard samples were lower than 5% and decreased with temperature.
出处
《低温工程》
CAS
CSCD
北大核心
2009年第3期36-40,共5页
Cryogenics
关键词
热导率
热扫描
自动化
漏热
低温
thermal conductivity
heat-scanning
automated control
heat leakage
low temperature
