Measurement of Submilligram Masses Using Electrostatic Force
Measurement of Submilligram Masses Using Electrostatic Force
复制标题
DOI：
10.1109/tim.2018.2886867
复制
发表时间：
2019-06-01
影响因子：
5.6
通讯作者：
Stirling, Julian
中科院分区：
文献类型：
--
作者：
Shaw, Gordon A.;Stirling, Julian
国际单位制中千克的重新定义提供了质量和普朗克常数之间的直接联系。有了这一点，就有可能实现使用电气计量的千克。我们描述了一种方法，使用静电力天平（EFB）将这种质量测量方法扩展到亚毫克级。通过对天平内的电容、电压和位置进行可追溯的测定，可确定亚毫克级伪影的质量值。对这些测量结果进行了不确定度分析。结果表明，相对于目前通过传统的方法，基于公斤细分的真实质量的不确定性大幅减少。由于EFB测量是在真空中进行的，因此转换为常规质量需要在使用位置进行空气浮力校正。尽管浮力校正增加了额外的不确定性，使用EFB方法减少了一个数量级的亚毫克质量测量的不确定性。
The redefinition of the kilogram within the International system of units provides a direct link between mass and Planck's constant. With this in place, it becomes possible to realize the kilogram using electrical metrology. We describe a method that scales this mass measurement approach to the submilligram level using an electrostatic force balance (EFB). Through traceable determination of capacitance, voltage, and position within the balance, the mass values of submilligram artifacts are determined. An uncertainty analysis is carried out on these measurements. Results show a substantial reduction in uncertainty relative to those currently available through conventional approaches based on kilogram subdivision for true mass. Since the EFB measurements are carried out in a vacuum, conversion to conventional mass requires an air buoyancy correction at the location of use. Despite additional uncertainty added by buoyancy correction, the use of the EFB method decreases uncertainty in submilligram mass measurement by an order of magnitude.