Oleh Velychko, Valentyn Isaiev
The National measuring standards ensure the quality of measurements in different areas of science and technology. The actual errors of standards are not the only necessary characteristics to be determined. The long-term stability of the corrections also should be evaluated to guarantee the uncertainty of measurement is within the specified margin and, as a consequence, the metrological traceability is established. This paper mainly concerns the stability evaluation of the top-level standard for metrology service in low-frequency voltage measurement. The AC-DC transfer difference of...
TC4 Symposium 2023
· TC4
· 2023
· 10.21014/tc4-2023.05
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Nikola Djuric, Dragan Kljajic, Tamara Skoric, Nicola Pasquino
The appearance of modern electromagnetic field (EMF) monitoring networks, such as the Serbian EMF RATEL network, has enabled wireless observation of EMF level in various surroundings, particularly in areas where people experience increased sensitivity to EMF exposure. Such areas are residential locations, where persons can reside many hours per day, kindergartens, schools, hospitals and children’s playgrounds. They demand daily, comprehensive EMF monitoring, compliance checking with prescribed reference levels, as well as transparent dissemination of acquired results. This paper presents an...
TC4 Symposium 2023
· TC4
· 2023
· 10.21014/tc4-2023.04
· Download
Marcin Wojciechowski, Kateryna Hovorova
This paper describes setups for measuring noise in the frequency range from 10 kHz to 100 MHz of semiconductor structures made of new Diracmaterials - 2D-COF/MOF intended for the construction of QHRS quantum standards. The main emphasis was placed on the preamplifiers. The first design gives solution with equivalent input noise value of about 1 nV/√?? at 100 kHz and 400 V/V amplification, second - improves the spectrum analyzer's noise figure (NF) from 7 dB to 0.64 dB
TC4 Symposium 2023
· TC4
· 2023
· 10.21014/tc4-2023.03
· Download
Daniel Belega, Dario Petri, Dominique Dallet
In this paper an algorithm for frequency and damping factor estimation of a real-valued noisy damped sinusoid is proposed. It is an extension of the three-point Interpolated Discrete Fourier Transform (3p-IpDFT) undamped sinusoid frequency estimator based on Maximum Sidelobe Decay (MSD) windows. Analytical expressions for the frequency and the damping factor estimators are provided and the related estimation errors due to the contribution of the spectral image component are derived and compensated. The accuracies of the proposed algorithm and other stateof-the-art frequency-domain based...
TC4 Symposium 2023
· TC4
· 2023
· 10.21014/tc4-2023.02
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Oleh Velychko, Tetyana Gordiyenko
Drift is an undesirable property of all measuring instruments and standards during their life cycle. The analysis of instrumental drift of measuring instruments and standards is important in metrology. Reliable accounting for drift plays an important role in maintaining measurement accuracy. For resistance, capacitance and inductance standards long-term drift is predictable. The analysis of drift types and the main methods of its evaluation for measuring instruments between its calibrations has been carried out. The results of evaluation of the long-term drift of inductance and capacitance...
TC4 Symposium 2023
· TC4
· 2023
· 10.21014/tc4-2023.01
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T. Morioka
This paper describes the results of performance evaluation of Coriolis flow meters from various manufacturers in high-pressure hydrogen actual flow using a calibration system with critical flow Venturi nozzles as a reference. The calibration system consisting of five nozzles was developed to calibrate the flowmeters by high-pressure, high-flow-rate hydrogen gas. The performance evaluation test of the Coriolis flowmeters wasconducted at maximum pressure of 70 MPa, gas temperature of 0 °C and -40 °C, and flow rate range from 0.5 kg/min to 3.0 kg/min. It was confirmed that the instrumental...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.162
· Download
H.-B. Böckler, M. de Huu, R. Maury, S. Schmelter, M. D. Schakel, O. Büker
This paper gives an overview of the Joint Research Project (JRP) 20IND11 “Metrology infrastructure for high-pressure gas and liquified hydrogen flows” (MetHyInfra), the challenges to tackle and the strategy to deal with these challenges. It will outline how this project will lead to a state of art for hydrogen quantity measurement. The paper is connected to four other FLOMEKO submissions, which deal with the latest outputs from the project.
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.161
· Download
F. Luo, R. Gan, P. J. Zhao, J. Zhou, M. T. Xiong, W. Lu
Hydrogen fuel cell technology is an important development direction of clean energy vehicles, which has the characteristics of zero pollution and renewability. As a key role in the commercial operation of hydrogen energy vehicles, the accuracy of the hydrogen filling quantity directly affects trade fairness and market promotion. The master meter method is generally used for the flow calibration of the existing compressed hydrogen dispenser, tin other words, high-precision Coriolis mass flowmeter is connected in series to the hydrogen filling pipeline on site, and the calibration is completed...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.160
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B. Mickan, H.-B. Böckler, D. Schumann, J. van der Grinten
In the field of gas transport, the de-carbonisation of the energy supply is forcing the exchange of natural gas with hydrogen, either in mixtures or even pure hydrogen. Therefore, there is an increasing need to have reliable information about the behaviour of existing metering technologies with such hydrogen enriched gases or pure hydrogen. On the other hand, the availability of testing and calibration infrastructures for hydrogen has been very limited so far. A fast approach to close this gap is the usage of scaling procedures to transfer the calibration results gathered at facilities with...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.159
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M. MacDonald, N. Glen, M. A. de Huu, R. Maury, S. Rønneberg, A. Wiener
Verifications of hydrogen refuelling stations have shown that variations in the station design and operation can greatly influence accuracy at the dispenser, and there are sources of error unrelated to the flow meter which if uncorrected make it difficult to achieve the accuracy requirements of OIML R-139. To improve dissemination of knowledge in this area, an interactive measurement uncertainty tool has been developed which allows the user to specify a range of different station configurations and filling scenarios to estimate the resulting errors at the dispenser. This is intended to serve...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.158
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