Comparisons of national standards of the unit of length in the field of measurement of parameters of form deviation the flatness of optical surfaces COOMET.L-S15

2021 ◽  
pp. 60-64
Author(s):  
Oleksandr L. Kostrikov ◽  
Volodymyr S. Kupko ◽  
Andrii I. Shloma ◽  
Denis A. Novikov ◽  
Valery G. Lysenko ◽  
...  
Keyword(s):  
National Standards ◽  
Important Type ◽  
Optical Surfaces ◽  
Interference Measurement ◽  
Cipm Mra ◽  
Unit Of Length ◽  
Primary Standards ◽  
Form Deviation

Precision interference measurement of parameters of form optical surfaces are one of the most important type of the measurement in the field of the geometrical values. In countries-participants of this comparisons the special primary standards in this field of measurements take part in reproduction and transmission the unit of length in this field of measurements ensuring high measuring and calibrating capabilities countries in this type of measurement. In this article presents the result of supplementary comparisons COOMET 570/UA-a/12. The result of comparisons allowed to declare to Belarus and Russia, and to confirm to Ukraine their measuring and calibrating capability in database CIPM MRA.

Dosimetry of High-Energy Photon Beams Based on Standards of Absorbed Dose to Water: Abstract

2001 ◽  
Vol 1 (1) ◽  
pp. 8-8 ◽  
Author(s):  
K. Hohlfeld ◽  
P. Andreo ◽  
O. Mattsson ◽  
J. P. Simoen
Keyword(s):  
Reference Conditions ◽  
International Comparisons ◽  
Absorbed Dose ◽  
High Energy ◽  
National Standards ◽  
Photon Radiation ◽  
Photon Beams ◽  
Radiation Induced ◽  
Absorbed Dose To Water ◽  
Primary Standards

This report examines the methods by which absorbed dose to water can be determined for photon radiations with maximum energies from approximately 1 MeV to 50 MeV, the beam qualities most commonly used for radiation therapy. The report is primarily concerned with methods of measurement for photon radiation, but many aspects are also relevant to the dosimetry of other therapeutic beams (high-energy electrons, protons, etc.). It deals with methods that are sufficiently precise and well established to be incorporated into the dosimetric measurement chain as primary standards (i.e., methods based on ionisation, radiation-induced chemical changes, and calorimetry using either graphite or water). The report discusses the primary dose standards used in several national standards laboratories and reviews the international comparisons that have been made. The report also describes the reference conditions that are suitable for establishing primary standards and provides a formalism for determining absorbed dose, including a discussion of correction factors needed under conditions other than those used to calibrate an instrument at the standards laboratory.

scholarly journals Traceability Features of the Electric Power Unit in Ukraine

2019 ◽  
Author(s):  
Oleh Velychko ◽  
Stanislav Karpenko
Keyword(s):  
Comparative Analysis ◽  
Electric Power ◽  
Power Unit ◽  
National Standards ◽  
Cipm Mra

The paper describes some aspects concerning the realization of the electric power unit traceability in Ukraine in the CIPM MRA understanding through participation in Key and Supplementary Comparisons of national standards and in the ILAC MRA understanding through participation in inter-laboratory comparisons. The authors have demonstrated comparative analysis of EURAMET.EM-K5.1, COOMET.EM-S2, COOMET.EM-K5 comparisons results and practically realized the procedure for realisation traceability of the electric power unit in Ukraine.

Analysis of Primary Standards for Pipeline Operation Safety and Security in China

2012 ◽  
Author(s):  
Juan Zheng ◽  
Jinyun Zhao ◽  
Biyuan Shui ◽  
Kaixuan Wu ◽  
Lili Zhang
Keyword(s):  
Oil And Gas ◽  
Oil Pollution ◽  
National Standards ◽  
Third Party ◽  
Environmental Damage ◽  
Technical Specifications ◽  
The Government ◽  
Primary Standards ◽  
Security Standards ◽  
Pipeline Safety

Over 40,000 kilometers of pipeline transporting natural gas, oil, and other hazardous liquids have been built from 2001 to 2010 in China. More than 100,000 kilometers pipeline will be constructed from 2011 to 2015. While being considered as an efficient and safe means, many pipelines carry materials with the risk to cause public injury and environmental damage. Pipeline safety and security issues involve with many groups: the government, oil and gas pipeline companies, and local communities. Standards play an important role to ensure these groups working together to achieve common goals. Pipeline operation safety and security mainly rely on the partial or complete incorporation of standards by reference. Standards Development Organizations (SDO) and pipeline companies have done lots of work to make the standards working well in the past ten years. The “standard analysis project” was one of them that were taken to improve pipeline safety and security. This paper briefly reviews the primary standards which consist of national standards, industry standards and enterprise standards for pipeline operation safety and security. Combined with the technical development and the pipeline operation situation, the standards were analyzed, especially for the differences of technical specifications in the standards. Several aspects are pointed out as the key issues to improve pipeline operation safety and security standards, including pipeline integrity management standards, pipeline Safety Instrumented System standards, standards preventing pipeline from Third Party Damages, standards protecting environment from unexpected oil pollution, and permafrost areas pipeline operation and maintenance standards. In addition to the issues mentioned above, the related legislation situation in China is also taken into consideration. Keeping and improving pipeline safety and security is a task that not only needs the development of supporting standards but the implementation of the standards. According to the analysis results, SDOs will continue improving pipeline safety and security standards by launching relevant standard development projects and encouraging research and development achievements transfer to standards.

Joint Investigations of the Metrological Characteristics of the Complex of State Primary Standards of the Unit of Length

2018 ◽  
Vol 61 (9) ◽  
pp. 847-853
Author(s):  
E. A. Milovanova ◽  
K. I. Malikov ◽  
N. V. Ivannikova ◽  
V. L. Fedorin ◽  
N. A. Kononova ◽  
...  
Keyword(s):  
Metrological Characteristics ◽  
Unit Of Length ◽  
Primary Standards

scholarly journals Improvement of the Russian National Secondary Standard of the Unit of Length Using Latest Ultra-Stable Laser Equipment

2019 ◽  
Vol 22 (4) ◽  
pp. 109-114
Author(s):  
Andrew A. Mosckalev ◽  
Ardi Rahman
Keyword(s):  
Measurement Uncertainty ◽  
Frequency Comb ◽  
Uncertainty Budget ◽  
National Standards ◽  
Secondary Standard ◽  
Measuring System ◽  
Internal Diameter ◽  
Traceability Chain ◽  
Unit Of Length ◽  
Stable Laser

Introduction. Increasing demands of precise geometry measurements by science and industry cause the necessity of improvement in an associated branch of legal and practical metrology. One of the most significant fields is the measurement of internal dimensions and so the issues with the unit of meter transfer. Now we face the situation when the current accuracies of National standards of different levels in corresponding traceability chain (reference rings measurements) get close to each other. This means that we have to make the standard of upper level more precise. One of the obvious ways is to apply the latest ultra-stable laser locked to a frequency comb.Objective. The objective is to propose possibilities for improvement of the National secondary standard of the unit of length by researching its measuring capabilities to minimize measurement uncertainty.Materials and methods. The calculation of expanded uncertainty of internal diameter measurements by the National secondary standard of the unit of length is performed according to the international document «Guide to the Expression of Uncertainty in Measurement» JCGM 100:2008 approved by BIPM. The secondary standard research results represented in previous reports and publications are also taken into consideration.Results. Detailed uncertainty budget for the proposed measuring system is given as well as graphical data representing the accuracy improvement.Conclusion. Actions for minimization of measurement uncertainty components of the National secondary standard of the unit of length in the field of reference ring internal diameter measurements in combination with state-of-the-art laser interferometer system improve it to the next frontiers of accuracy and precision.

Comparison of national standards of Russia and Finland for the unit of length

1997 ◽  
Vol 40 (3) ◽  
pp. 289-293
Author(s):  
L. Yu. Abramova ◽  
V. M. Baratov ◽  
V. L. Fedorin ◽  
L. F. Khavinson ◽  
E. I. Latysheva ◽  
...  
Keyword(s):  
National Standards ◽  
Unit Of Length

Medicare Advisers Call for National Standards on Imaging

Ob Gyn News ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 43
Author(s):  
JENNIFER SILVERMAN
Keyword(s):  
National Standards
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