Understanding Emissivity

Emissivity refers to an object’s ability to radiate infrared energy. Because infrared instruments measure radiant energy, it is imperative for a thermographer to understand emissivity and how it can vary. Source: IR/INFO.ORG…

Differential sampling of AC waveforms based on a programmable Josephson voltage standard using a high-precision sampler

A high-precision sampler, Fluke 8588A multimeter in the sampling mode, was utilised to perform differential sampling of AC waveforms with a programmable Josephson voltage standard. The systematic error on the differential sampling, induced by the inherent voltage-response characteristics and built-in low-pass filter of the sampler, was estimated. Experimental results and numerical simulations revealed that the sampler could be used for reliable differential sampling of AC waveforms at frequencies up to several kilohertz, with an appropriate number of the voltage steps per…

Baron radar technology to assist US Air Force with space launch operations

Baron radar technology to assist US Air Force with space launch operations

The United States Air Force has selected weather intelligence specialist Baron to provide a new weather radar system and data display technology to help facilitate the safe launch of space launch operations.
In 2022, Baron will install a 250KW Klystron C-band dual-polarization radar at Patrick Space Force Station in Florida. The station is just south of Cape Canaveral, the most prominent location for space launch activities in the USA.
Organizations including SpaceX, ULA, NASA, USAF and the US Navy will benefit from the…

News from the BIPM laboratories—2021

In order to fulfil its mission to ensure and promote the global comparability of measurements, the BIPM operates laboratories in the fields of physical metrology, time, ionizing radiation and chemistry. These laboratories act as centres for scientific and technical collaboration between Member States providing capabilities for international measurement comparisons on a shared cost basis. They coordinate international comparisons of national measurement standards agreed to be of the highest priority, and they establish and maintain appropriate reference standards for use as the…

Appreciating the Value of Good Stewardship

What’s stewardship? Simply stated, it’s the “personal responsibility to take care of something owned by someone else.” Here are five areas to focus on when developing and/or strengthening a culture of stewardship within our organizations. Source: IR/INFO.ORG…

Key comparison BIPM.RI(I)-K4 of the absorbed dose to water standards of the NRC, Canada and the BIPM in 60 Co gamma radiation

A new key comparison of the standards for absorbed dose to water of the National Research Council of Canada (NRC), Canada and the Bureau International des Poids et Mesures (BIPM) was carried out in the 60 Co radiation beam of the BIPM in October 2020. The comparison result, based on the calibration coefficients for three transfer standards and evaluated as a ratio of the NRC and the BIPM standards for absorbed dose to water, is 0.9995 with a combined standard uncertainty…

PAWG Pilot Study on Quantification of SARS-CoV-2 Monoclonal Antibody – Part 1

Under the auspices of the Protein Analysis Working Group (PAWG) of the Comité Consultatif pour la Quantité de Matière (CCQM) a pilot study, CCQM-P216, was coordinated by the Chinese National Institute of Metrology (NIM), National Research Council of Canada (NRC) and the Bureau International des Poids et Mesures (BIPM). Eleven Metrology Institutes or Designated Institutes and the BIPM participated in the first phase of the pilot study (Part 1). The purpose of this pilot study was to develop measurement capabilities for…

Report on the AFRIMETS.M. F-S1 supplementary force comparison for 10 kN and 100 kN

This bilateral comparison of Force Standard Machines (FSM) named AFRIMETS.M. F-S1 was carried out in the force range from 1 kN to 100 kN between Physikalisch-Technische Bundesanstalt (PTB) of Germany as the pilot laboratory and Kenya Bureau of Standards (KEBS) of Kenya as the participant laboratory. KEBS had already participated in the APMP.M. F-K2 key comparison where measurements were made only at 50 kN and 100 kN force steps. Therefore, this bilateral comparison was planned to thoroughly compare the KEBS FSM…

A comparison in conventional mass measurements SIM.M.M-S6

The present document reports the results of a bilateral comparison in the calibration of mass standards that was carried out between CESMEC (Chile) and CENAMEP AIP (Panamá). This comparison was carried out in the following nominal values: 200 mg, 1 g, 50 g, 200 g, 1 kg, 2 kg, and 10 kg. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database…