电热法测热功当量实验数据处理方法

Data processing in the experiment of the mechanical equivalent of heat by electrothermal method

基于温度补偿原理和牛顿冷却定律,对电热法测量热功当量实验提出了2种散热修正方法,即温度补偿法和线性回归法.温度补偿法采用作图法,数据处理操作简单;而线性回归方法计算相对复杂,实验过程散热系数保持不变的假设也会给结果带来误差,但可以对实验结果的不确定度给出定量评估.基于此,针对不同的实验数据量和不同的数据采样间隔对实验结果进行了比较,给出了最佳方案.

Two data processing methods were proposed to revise heat radiation effect in the experiment of measuring the mechanical equivalent of heat by electrothermal method, which were temperature compensation method and linear regression method. When using schematic approach, the temperature compensation method was simple, while twice linear regression method was more complicated. What＇s more, the assumption of a constant heat radiation coefficient could also result in deviations in twice linear regression method, but a quantitative estimation of the uncertainty could be given. On the basis of these methods, different data volume and sampling interval were compared and the best scheme was proposed.