摘要
采用微珠状热敏电阻作为点热源和测温元件,在一维点源脉冲传热模型的基础上建立一种同时测量生物流体热扩散系数、导热系数和热容的瞬态方法。运用非线性参数拟合,直接从感温热敏电阻对热脉冲温度响应中同时获取待测的热物性参数。实验中设计了一个高灵敏度的温度测量电路,测试结果表明,本方法测量误差小于4%。此外,还讨论了测量数据的处理和影响测量的因素。
A transient point heat pulse method, in which two tiny thermistor beads are used as point heater and temperature sensor respectively, has been developed for absolute measurement of thermal diffusivity, thermal conductivity and heat capacity of bio-fluids simultaneously. Based on the theoretical solution of the point source heat transfer, the Marquardt nonlinear fit method is used to extract thermal properties from the experimental data. An experimental system with high sensitivity for temperature is designed to perform the measurement. Experimental results of samples are in agreement with the recommended values. In addition, the way to deal with experimental data and the factors of measurement uncertainty are discussed.
出处
《计量学报》
EI
CSCD
北大核心
2005年第1期23-26,共4页
Acta Metrologica Sinica
基金
国家自然科学基金(50406013)
