Projects / Programmes
Maintenance and surveillance of group standards
| Code |
Science |
Field |
Subfield |
| 2.15.01 |
Engineering sciences and technologies |
Metrology |
Sensors and data acquisition |
| Code |
Science |
Field |
| P180 |
Natural sciences and mathematics |
Metrology, physical instrumentation |
| P190 |
Natural sciences and mathematics |
Mathematical and general theoretical physics, classical mechanics, quantum mechanics, relativity, gravitation, statistical physics, thermodynamics |
group standards, traceability, uncertainty, stability, dissemination
Researchers (5)
Organisations (1)
Abstract
The project proposal deals with possible methods and development of procedures how to maintain, survey and control a group of transfer measurement standards. The objective is to maintain the highest level of accuracy and lowest measurement uncertainty of a well structured hierarchically organised metrology organisation in a given environment (could be at a national level of metrological laboratories for national standards as well as on corporate level for quality production in industrial environment), thus providing traceability to highest levels, typically primary standards and providing dissemination to lower levels of particular measurement values with minimal additional uncertainties.
Basic hypothesis is, that metrological laboratories, which are not considered as primary laboratories in terms of realising SI and derived units from definition by means of quantum metrology, nevertheless perform the vast majority of highest level calibrations requiring ultimate level of confidence, therefore providing industry with traceable measurements. Hence, the maintenance of reference standards in these ''''secondary laboratories'''' is vital especially since group standards, usually consisting of a number of transfer standards, exhibit only minimal additional assigned uncertainties which are due to comparisons with primary standards.
The above mentioned approach of group standards in terms of organisation and transfer standards in terms of technology is becoming the most optimal solution for most metrological demands, provided that the overall uncertainty of the group of transfer standards is as close as possible to primary standards. A very significant advantage is the fact, that the benefits, i.e. ease of the dissemination of values to lower levels as compared to primary standards, and especially the overall costs, outweigh slightly smaller uncertainties, which are still completely acceptable for most of the requirements.
By maintaining group standards it is supposed to provide traceability to the highest level of primary standards, thus assigning to each member of the group its ''''true'''' value with assigned uncertainty. In addition, it is required to perform various algorithms upon the entire group in order to satisfy several basic requirements:
- improved reliability, confidence in the group standards as opposed to individual standards,
- decrease of uncertainties due to statistical properties of averages,
- prediction of individual group members and/or group values,
- improved reliability and maintainability on a component and a system level,
- fault diagnostics and influence on recalibration periods.
