A new snow tracking sensor

This cheaper type of sensor will make it possible to cover a larger area while keeping travel and labour costs down. Source: What’s New in Measurement and Control?…

Final report on supplementary comparison COOMET.PR-S7: Laser power responsivity (COOMET 599/RU/13)

The National Institute of Standards and Technology (NIST), USA and the All-Russian Research Institute for Optical and Physical Measurements (VNIIOFI), Russia agreed in February 2013 to conduct a comparison on the laser power responsivity at wavelengths of 532 nm, 1.064 μm and 10.6 μm. The aim of this comparison is to assess the equivalence of the laser power responsivity between two laboratories. The comparison was conducted within the COOMET regional metrological organization (COOMET 599/RU/13) and was registered in the BIPM Key…

Reduced Data Accuracy Helps Save Energy

Computers are using more and more energy. APROPOS – an international EU-funded project coordinated by Tampere University, Finland – aims to improve the energy efficiency of global data usage up to 50-fold by reducing data accuracy. Source: What’s New in Measurement and Control?…

Sensors show how more whales would combat climate change

Tags with an accelerometer, GPS, microphone and camera let scientists calculate for the first time how much whales eat, and poo. More whales means more iron in the water leading to more plankton taking up CO2. Source: What’s New in Measurement and Control?…

Calibration of diameter standards (EURAMET.L-K4.2015)

At its meeting in October 2014, the EURAMET TC for Length, decided upon a key comparison on the calibration of diameter gauges, named EURAMET.L-K4.2015. Twenty National Metrology Institutes and one Designated Institute from Europe, Asia and South America participated in this comparison, which was carried out in two parallel groups. Twelve laboratories from EURAMET participated in group 1, while ten laboratories from EURAMET and two laboratories from GULFMET and SIM participated in group 2. To provide the link three laboratories, CEM,…

IoT devices communicate through light

A research team of IMDEA Networks Institute has introduced Internet of Things (IoT) devices that communicate without any batteries and harvest energy and receive data through visible light Source: What’s New in Measurement and Control?…

International comparison CCQM-K117 ammonia

At the highest metrological level, ammonia gas standards are commonly prepared gravimetrically as Primary Standard Mixtures or using a dynamic standard. This international key comparison addressed the measurement of the amount fraction ammonia in nitrogen, to support calibration and measurement services for mainly environmental applications. The nominal amount fraction was 14 μmol mol -1 . The results in this Track C key comparison on the composition of biogas are generally good. To reach the main text of this paper, click on Final…

Automatic alignment technique for the suspended coil in the joule balance

An automatic alignment technique was developed for the joule balance to reduce the uncertainty caused by alignment errors. Using the flexures and decoupling structure of the suspended coil, the proposed alignment system can automatically recognize the linear relationship between the initial position and posture of the suspended coil when the current is off, and its parasitic horizontal linear and angular displacements when the current is on. Subsequently, several actuators including mini-motors and an X – Y stage are controlled to adjust…

International comparison CCQM-K74.2018: Nitrogen dioxide, 10 μmol mol-1

The CCQM-K74.2018 comparison evaluated the level of compatibility of nitrogen dioxide (NO 2 ) in nitrogen standards at nominal amount fractions of 10 μmol/mol provided by National Metrology Institutes. Fourteen laboratories participated in the comparison, submitting two standards each, with comparative measurements and comparison coordination undertaken by the BIPM. Measurements at the BIPM were performed from July 2018 to May 2019. The key comparison reference values (KCRV) for each submitted standard were established at three different times during the measurement period…

Supplementary comparison APMP.RI(I)-S1 of standards for absorbed dose to water in 60 Co gamma radiation at radiation processing dose levels

Four national standards for absorbed dose to water in 60 Co gamma radiation at the dose levels used in radiation processing have been compared over the range 0.1 kGy to 50 kGy using alanine dosimeters of the Office of Atoms for Peace (OAP) as transfer dosimeters. The comparison was piloted by the OAP who also participated. Two laboratories from the original six were forced to withdraw due to equipment problems. The results at low doses (0.1 kGy) showed a much wider…