材料导温系数、导热系数和比热的闪光法测量
来源期刊：中南大学学报(自然科学版)1983年第2期
论文作者：薛健
文章页码：38 - 44
关键词：导温系数； 导热系数； 闪光法； 比热测量； 标准样品； 脉冲激光； 黑体； 测量方法； 传统方法； 最大温升
摘 要：本文简略论述了闪光法测量比热cP、导温系数a及导热系数λ的原理和特点,着重指出比热测试的改进是充分发挥其效能的关键。重点报道了对比热的测量方法和技术的改进及实验结果,该方法具有误差小、样品无需特殊处理和便于实现综合测试等优点。
Abstract: The current state-of-the-art of thermal conductivity, thermal diffus-ivity and specific heat measurements by the flash technique is discussed.Because of many advantages in this method, it has become a main methodfor measuring thermal diffusivity in recent years. However, the advantagesof this method in specific heat measurement had been offset by the unreli-ability of the measured values. This problem happened on account of thedifferences on the surfaces of specimens. In order to surmount this difficulty,a novel method was developed four years ago. In this method, known asthe "compound blackbody method", the surface of the specimen was used asa part of the inner wall of a blackbody, a laser pulse struck at a standardcompound blackbody consiting of standard sample and a hollow shell, andthen struck at the compound blackbody to be measured in the same way.According to the properties of blackbody, a highly accurate specific heatvalue can be obtained without any special treatment of the surface of thesample, and at the same time, the thermal diffusivity is also obtained, Itis known that. the advantages mentioned above are not present in the con-ventional methods.
