双次热冷法用于比热容的高精度测量

提出了一种双次热冷法用于比热容的准确测量.该方法通过对测量系统空载时和放置待测样品时加热和冷却过程中的温度序列进行处理从而计算出比热容,可有效补偿散热因素对测量结果的影响,显著提高测量精度.以小样品水为例进行了比热容测量实验,在正常的散热环境下测量误差小于1%.结果表明:双次热冷法适用于对误差有一定要求的小样品比热容测量,设备简单、操作方便,配合其他测量方法可实现范围更广、精度更高的比热容测量.

High Precision Measurement ofSpecific Heat Using Dual Heating and Cooling

Abstract： A dual heating and cooling method was proposed to precisely measure specific heat in this paper. The apparatus with no load and with the measured object was heated and cooled respectively. The temperature sequences during the four courses were processed to calculate the specific heat. The proposed method can eliminate the influence of heat dissipation on measurement and significantly improve the precision. A measurement experiment was conducted on a bit of water as specimen. The measurement error is less than 1% under normal heat dissipation condition, which validates the effectiveness of the method. The proposed method is suitable for measuring the specific heat of a small sample within certain error limit. It can be operated conveniently on simplified apparatus and realize the specific heat measurement with higher precision in a wider region cooperating with other methods.