Report on the CCT Supplementary comparison S2 on thermal conductivity measurements of insulating materials by guarded hot plate [0.03%]
关于由防护热板法测量保温材料导热系数的CCT补充比对(S2)报告
B Hay,R Zarr,C Stacey et al.
B Hay et al.
Seven National Metrology Institutes (NMIs) from France, United States, United Kingdom, Russia, Mexico, China and Germany participated in an inter-laboratory comparison on thermal conductivity measurements by the Guarded Hot Plate method. Th...
The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass [0.03%]
瓦特或Kibble天平：实现质量单位新定义的方法
Ian A Robinson,Stephan Schlamminger
Ian A Robinson
The redefinition of the SI unit of mass in terms of a fixed value of the Planck constant has been made possible by the Kibble balance, previously known as the watt balance. Once the new definition has been adopted, the Kibble balance techni...
Reduction of calibration uncertainty due to mounting of three-axis accelerometers using the intrinsic properties model [0.03%]
利用固有特性模型减少三轴加速度计安装引起的校准不确定性
Michael Gaitan,Iris Mariela López Bautista,Jon Geist
Michael Gaitan
We show that the calibration of tri-axis accelerometers based on the device's intrinsic properties alleviates the uncertainty due to mounting misalignment in comparison to the use of the sensitivity matrix. The intrinsic properties of a tri...
Transient heating in fixed length optical cavities for use as temperature and pressure standards [0.03%]
固定长度光学腔的瞬态加热用作温度和压力标准
J Ricker,K O Douglass,S Syssoev et al.
J Ricker et al.
Optical refractometry techniques enable realization of both pressure and temperature directly from properties of the gas. The NIST refractometer, a fixed length optical cavity (FLOC) has previously been evaluated for operation as pressure s...
Absolute energies and emission line shapes of the L x-ray transitions of lanthanide metals [0.03%]
镧系金属LX射线跃迁的绝对能量和发射线形狀
J W Fowler,G C O&#x;Neil,B K Alpert et al.
J W Fowler et al.
We use an array of transition-edge sensors, cryogenic microcalorimeters with 4 eV energy resolution, to measure L x-ray emission-line profiles of four elements of the lanthanide series: praseodymium, neodymium, terbium, and holmium. The spe...
Shisong Li,Michael Stock,Stephan Schlamminger
Shisong Li
We propose a new permanent magnet system for Kibble balance experiments, which combines advantages of the magnet designs invented by the National Physical Laboratory (NPL) and by the Bureau International des Poids et Mesures (BIPM). The goa...
Dual Josephson Impedance Bridge: Towards a Universal Bridge for Impedance Metrology [0.03%]
双约瑟夫森阻抗电桥：迈向通用阻抗计量电桥
Frédéric Overney,Nathan E Flowers-Jacobs,Blaise Jeanneret et al.
Frédéric Overney et al.
This paper presents a full characterization of a Dual Josephson Impedance Bridge (DJIB) at frequencies up to 80 kHz by using the DJIB to compare the best available impedance standards that are (a) directly traceable to the quantum Hall effe...
Benjamin F Jamroz,Dylan F Williams
Benjamin F Jamroz
The Monte Carlo method is an established tool that is often used to evaluate the uncertainty of measurements. For computationally challenging problems, Monte Carlo uncertainty analyses are typically distributed across multiple processes on ...
Thomas Gerrits,Alan Migdall,Joshua C Bienfang et al.
Thomas Gerrits et al.
We measure the detection efficiency of single-photon detectors at wavelengths near 851 nm and 1533.6 nm. We investigate the spatial uniformity of one free-space-coupled single-photon avalanche diode and present a comparison between fusion-s...
Activity measurements of the radionuclides 18F and 64Cu for the NIST, USA in the ongoing comparisons BIPM.RI(II)-K4.F-18 and BIPM.RI(II)-K4.Cu-64 [0.03%]
用于正在进行的BIPM.RI(II)-K4.F-18和BIPM.RI(II)-K4.Cu-64关键比对中18F和64Cu放射性核素的美国NIST活度测量
C Michotte,M Nonis,D Bergeron et al.
C Michotte et al.
In 2016, comparisons of activity measurements of 18F and 64Cu using the Transfer Instrument of the International Reference System (SIRTI) took place at the National Institute of Standards and Technology (NIST, USA). This is the first SIRTI ...