船载微型Ga-In共晶固定点的现场复现方法研究  

Study on On-site Reproduction Method of Shipborne Miniature Ga-In Eutectic Fixed Point

作　　者：朱幸福 潘江 王光耀 刁福广 孙建平[2] 李婷[2] 王彭宇 ZHU Xingfu;PAN Jiang;WANG Guangyao;DIAO Fuguang;SUN Jianping;LI Ting;WANG Pengyu(College of Metrology&Measurement Engineering,China Jiliang University,Zhejiang Hangzhou 310018,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018 [2]中国计量科学研究院,北京100029

出　　处：《计量学报》2024年第8期1125-1131,共7页Acta Metrologica Sinica

基　　金：国家重点研发计划(2022YFC2204301-02,2022YFF0607500/2022YFF0607501)。

摘　　要：将温标固定点技术应用于船载现场是实现温度量值扁平化,提升海洋温度测量水平的重要手段。为了弥补ITS90温标在海洋温区(-5~35℃)范围内固定点数目不足,不能对NTC热敏电阻进行有效校准的缺陷,研制了微型Ga-In共晶固定点,开展了船载控温箱微型Ga-In固定点温坪复现研究,同时探索了环境温度条件下微型Ga-In共晶固定点的复现。采用切线交点法和三次多项式拟合法对微型Ga-In固定点进行了评估和分析。结果表明:微型Ga-In共晶固定点重复性优于1 mK;微型Ga-In共晶固定点应该在固态并低于熔点的环境下保存。采用切线交点法赋值得到微型Ga-In共晶固定点相变温度为15.6549℃,扩展不确定度为1.54 mK(k=2)。Application of fixed point thermometry technology to the field calibration of shipbrone sensors is a key strategy for achieving flattening in temperature measurements and enhancing the accuracy of oceanic temperature measurements.The fixed points defined by ITS90 in the temperature from-5℃to 35℃is inadequate,which blocks the accuracy improvement of the marine NTC thermistors.A new miniature Ga-In eutectic fixed point was developed,and the reproducibilities of the fixed point in temperature controlled box and ambient environment were investigated.Two methods including the tangent intersection method and cubic polynomial fitting were used to obtain the values of the temperature plateaus.The results showed that the reproducibility of the miniature Ga-In eutectic fixed point is better than 1mK.In order to obtain better performance,the miniature Ga-In eutectic fixed point should be kept in solid state at temperature below its melting point.Using the tangent intersection method,the phase transition temperature of the miniature Ga-In eutectic fixed point is determined to be 15.6549℃,with an expanded uncertainty of 1.54mK(k=2).

关 键 词：温度计量 微型共晶固定点 Ga-In二元合金 NTC热敏电阻 海洋温度传感器 现场校准 

分 类 号：TB942[一般工业技术—计量学]