电子分析天平温度漂移的加权融合补偿方法  

Weighing fusion compensation method of temperature drift for electronic analytical balance

作　　者：黄强[1] 滕召胜[1] 唐享 林海军[2] 潘克敏 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]湖南师范大学工学院,长沙410081 [3]上海良平仪器仪表有限公司,上海200040

出　　处：《电子测量与仪器学报》2015年第8期1121-1129,共9页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(51205127)资助项目

摘　　要：电子分析天平的结构复杂,且对温度影响敏感,而温度漂移的自动补偿是制约国内外天平行业发展的技术难关。本文依据电磁力平衡传感器的工作机理,分析与电子分析天平称量结果密切相关的各关键元件温度特性,采用多点测温,建立多传感器加权融合温度漂移补偿模型,并利用最小二乘法确定融合模型系数,实现了电子分析天平的温度漂移自动补偿。检验结果表明,采用本文研究的补偿算法,在10-30℃范围内,量程220 g、分辨力0.1 mg的电子分析天平全量程示值误差绝对值不大于0.3 mg,优于国家标准《GB/T 26497-2011电子天平》规定的I级天平温度漂移对示值误差的影响指标。Electronic analytical balance has complex structure and is sensitive to temperature effect, while automatic temperature drift compensation is a technical difficulty to restrict the development of electronic balance in the domestic and overseas. In this paper, the characteristics of each key element closely related to weighting results are analyzed according to the working principle of electromagnetic force balance sensor. By using the multi-point temperature measurement, a temperature drift compensation model based on multi-sensor weighted fusion is established. The model＇ s coefficients are solved by least squares method, and the automatic temperature drift compensation is realized automatically. By using the proposed method, the test results demonstrate that the absolute value of the indication error of electronic analytical balance with the range of 220 g is not great than 0.3 milligram in the range 10 - 30℃, which is superior to the indication error index specified by Chinese National Standard ＂GB/T 26497 - 2011 Electronic balance＂ for the 1 st class balance.

关 键 词：电子分析天平 电磁力平衡传感器 加权融合 温度漂移补偿 最小二乘法 

分 类 号：TN79[电子电信—电路与系统] TB932[一般工业技术—计量学]