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oe1(光电查) - 科学论文

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  • [IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Research of the National Primary Standard of the High DC Voltage

    摘要： This paper is devoted to the research of the metrological characteristics of the National primary standard of the unit of electrical DC voltage of Ukraine in the range from 1 to 180 kV (NPS). The research has allowed to reduce the step of measuring the DC voltage in the range from 10 kV to 180 kV from 10 kV to 1 kV and to reduce the standard uncertainty of the measurement of the high voltage at the NPS.

    关键词： national primary standard of DC voltage,calibration of high voltage DC meters,Measurement of high DC voltage,uncertainty of measurement of DC voltage

    更新于2025-09-10 09:29:36

  • Re-evaluation of the correction factors for the GROVEX

    摘要： The GROVEX (GROssVolumige EXtrapolationskammer, large-volume extrapolation chamber) is the primary standard for the dosimetry of low-dose-rate interstitial brachytherapy at the Physikalisch-Technische Bundesanstalt (PTB). In the course of setup modifications and re-measuring of several dimensions, the correction factors have been re-evaluated in this work. The correction factors for scatter and attenuation have been recalculated using the Monte Carlo software package EGSnrc, and a new expression has been found for the divergence correction. The obtained results decrease the measured reference air kerma rate by approximately 0.9% for the representative example of a seed of type Bebig I25.S16C. This lies within the expanded uncertainty (k = 2).

    关键词： dosimetry,ionisation chamber,extrapolation chamber,low-dose rate brachytherapy,primary standard

    更新于2025-09-09 09:28:46

  • Improving the State Base of Measurement Standards in the Field of Photonics

    摘要： The base of measurement standards of the All-Russia Research Institute of Optophysical Measurements developed and employed by the Institute for metrological support of photonics technologies and products is described. The present condition and calibration capabilities of the state primary standards as well as the direction and outlook for further improvement of the standards are reviewed.

    关键词： State Primary Standard,photonics

    更新于2025-09-04 15:30:14