Comparison between matrix method, equation method and full air-buoyancy correction method for dissemination of microgram weights

作者：Ren Xiao Ping^*; Wang Jian; Cai Chang Qing; Su Shuang

来源：International Journal of Precision Engineering and Manufacturing, 2017, 18(9): 1213-1220.

DOI：10.1007/s12541-017-0142-0

• Mass metrology
• Weighing scheme
• Matrix method
• Equation method
• Full air-buoyancy correction method

Over the past 9 years since 2007, there has been growing interest in the field of small weight measurement, like determination of sensitivity property of microbalance. This drives the requirement for more accurate small weight measurement down to microgram level. NMIs researched on the microgram from manufacture, material and shape, storage and holding method, measurement equipment and weighing scheme. Subdivision comparison is commonly adopted and matrix method (MM) is used to solve the measurement Eq.. In this paper, the density of test and standard weight rather than the volume were adopted in MM. Details on how to use this method based on Matlab software were presented. Then the comparison between MM, Eqution method (EM) and full air-buoyancy correction method (FACM) were made. Differences between these three methods were analyzed and evaluation results were given out. Experiment showed that EM and FACM were of the same relative uncertainty, but MM had lower measurement uncertainty than EM and FACM.

• 出版日期2017-9
• 单位中国计量科学研究院