Development of a New Apparatus for SI Traceable Small Mass Measurements Using the Voltage Balance Method at NMIJ
Development of a New Apparatus for SI Traceable Small Mass Measurements Using the Voltage Balance Method at NMIJ
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NMIJ 使用电压平衡法开发 SI 可追溯小质量测量新仪器
DOI：
10.1109/tim.2020.3001408
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发表时间：
2020
影响因子：
5.6
通讯作者：
K. Fujii
中科院分区：
文献类型：
--
作者：
Yasuyuki Yamamoto;K. Fujita;K. Fujii
为了建立基于千克新定义的小质量和力的测量系统，开发了使用电压平衡方法的测量装置。该装置的主要部件是质量平衡机构、自动质量平移系统和用于平衡作用在小物体上的重力和静电力的电容致动器。通过使用可追溯到电气标准的电气方法来校准静电力。因此，电压平衡法实现了小质量的SI溯源和绝对测量。为了改进该方法，实施了新的技术方法，例如使用单片柔性铰链作为平衡机构，用于电气控制的双等电容系统，以及新型的屈曲弹簧。为了评估该装置的性能，进行了500-<inline-formula><tex-math notation="LaTeX">$\mu \text{g}$</tex-math></inline-formula>铝丝砝码质量的实验。500-<inline-formula><tex-math notation="LaTeX">$\mu \text{g}$</tex-math></inline-formula>砝码的称重结果为<inline-formula><tex-math notation="LaTeX">499.8 ~\mu \text{g}$</tex-math></inline-formula>。新装置的基本性能的小质量测量得到了证实。
Toward establishing a measurement system for small masses and forces based on the new definition of the kilogram, a measurement apparatus that uses the voltage balance method was developed. The main components of the apparatus are a mass balance mechanism, an automatic mass translation system, and a capacitance actuator for balancing the gravity force acting on the small object and the electrostatic force. The electrostatic force is calibrated by using the electrical methods that are traceable to the electrical standards. Therefore, the voltage balance method realizes SI traceable and absolute measurements of small masses. To improve the method, new technical approaches, such as the use of a monolithic flexure hinge for the balance mechanism, a double equal capacitor system for the electrical control, and a new type of buckling spring, were implemented. To evaluate the performance of the apparatus, an experiment of the mass of a 500-<inline-formula> <tex-math notation="LaTeX">$\mu \text{g}$ </tex-math></inline-formula> aluminum wire weight was conducted. A result of the weighing of the 500-<inline-formula> <tex-math notation="LaTeX">$\mu \text{g}$ </tex-math></inline-formula> weight was <inline-formula> <tex-math notation="LaTeX">$499.8~\mu \text{g}$ </tex-math></inline-formula>. The basic performance of the new apparatus for small mass measurements was confirmed.