固体线膨胀系数测定实验的改进

摘要

An improved method was applied to measure the linear expansion coefficient of solid samples ,so as to address the issue of temperature sweep rate control caused by large temperature gra-dient .The temperature gradient near a sample was effectively reduced by a program-controlled method when increasing and decreasing the temperature .The linear expansion coefficients of metal samples were obtained by this method and improved results were successfully achieved as expected .%针对固体线膨胀系数测定实验中样品所处温度梯度场过大、升温和降温速率控制精度低的问题，提出了实验改进的措施。阐述了减小实验样品的温度场梯度，用设定程序控制实验样品的升温、恒温和降温的实施过程，并对金属样品线膨胀系数测定实验结果进行了分析，取得了固体线膨胀系数测定实验的改进设计的预期效果。