工业铂热电阻全量程检测恒温槽偏离值的求解算法及测量结果的不确定度评定  

An error calculation method for industrial platinum resistances measuring thermostatic baths at full temperature range and uncertainty evaluation of the measuring results

作　　者：黄元津 杜文岚 

机构地区：[1]台州市计量技术研究院,浙江台州318000

出　　处：《传感器世界》2017年第11期34-38,共5页Sensor World

摘　　要：针对传统工业铂热电阻任意温度点检定过程中计算繁琐的问题,提出一种新型的恒温槽温度偏离值计算方法。首先研究了标准铂电阻温度计的温标内插公式与其反函数之间的误差值。再从标准铂电阻温度计的不同温度范围的温标内插公式以及差值函数出发,推导出标准铂电阻不同电阻所对应温度的函数表达式。最后使用FLUKE 1529四通道便携测温仪的温度显示值作为标准值,通过实验值与理论值的对比验证了内嵌算法误差,并结合具体实际应用对改进方法的不确定度进行了评定,满足检定要求。Aiming at the complex calculation problem in temperature verification process of platinum resistances at arbitrary temperature point in traditional industries, a new method for calculating the temperature deviation values of thermostatic baths is put forward. Firstly, the error between the thermometric scale interpolation formula and its inverse function of standard Pt RTDs is studied. And then, the function expression of the resistances corresponding to the temperatures is derived from the temperature scale interpolation formula and difference function of standard Pt RTDs at different temperature ranges. Finally, the error of the embedded algorithm is verified by the comparison between the experimental values and theoretical values with the temperature display values of a four channel portable thermometer FLUKE 1529 as the standard. Combined with the actual conditions, the uncertainty of the improved method is evaluated and meets the requirements of the calibration.

关 键 词：铂热电阻 参考函数 内插公式 温度 标准铂电阻温度计 

分 类 号：TH811[机械工程—仪器科学与技术]