研究目的
Investigating the use of electrical metrology to scale mass at the milligram to microgram scales using an Electrostatic Force Balance (EFB), comparing its uncertainty with traditional kilogram subdivision methods.
研究成果
The EFB method for mass measurement uses electrical metrology to scale the unit of mass at milligram to microgram scales, compatible with both current and redefined SI methods. It allows for a reduction in mass uncertainty of 1 to 2 orders of magnitude compared to kilogram subdivision.
研究不足
The balance’s statistical uncertainty becomes dominant below 500 micrograms, and the largest contributor to uncertainty is the temperature dependence of the capacitance gradient.
1：Experimental Design and Method Selection:
The EFB method involves using a 4-bar linkage to translate the inner cylinder of a concentric cylinder capacitor, measuring electrostatic force to determine mass.
2：Sample Selection and Data Sources:
Mass artifacts ranging from 50 micrograms to 20 milligrams are used.
3：List of Experimental Equipment and Materials:
Electrostatic Force Balance (EFB), laser interferometer, 3-terminal capacitance bridge, automated mass exchange system.
4：Experimental Procedures and Operational Workflow:
The process involves two steps - determining the capacitance gradient by translating the inner capacitor cylinder and measuring the change in applied voltage to yield the weight of the mass artifact.
5：Data Analysis Methods:
Uncertainty analysis includes type A and type B uncertainties, with a focus on temperature dependence of the capacitance gradient.
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