Vol.4 No.4 2012

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Research paper : Improvement of reliability in pressure measurements and international mutual recognition (T. Kobata et al.)−216−Synthesiology - English edition Vol.4 No.4 (2012) The research scenario is shown in Fig. 4. The main elemental technologies for this research are the various properties of the digital pressure gauge and the evaluation and calibration technologies. The properties of the digital pressure gauge include the measurement range, resolution, weight, size, linearity, stability in environment change and during transportation, and short- and long-term stability. These properties depend heavily on the manufacturer of the measuring device. On the other hand, the evaluation of various properties and the evaluation of uncertainty of the calibration value for the digital pressure gauge are the technologies in which AIST excels, since it owns the national standard and routinely evaluates various pressure gauges.To achieve the research objective, the aforementioned elemental technologies are integrated. First, the methods for property evaluation and the calibration methods of the digital pressure gauge are developed, to carefully evaluate the performance of the digital pressure gauge as a standard device. Particularly important are the evaluation technology for the stability of the digital pressures gauge in environment change and during transportation as well as the short- and long-term stability. Next, the use of the digital pressure gauge as the standard device is promoted to further integrate the elemental technologies, and to incorporate it into the metrological standard system including the establishment and maintenance of the national standard for pressure, international comparison of the national standards, and the standard provision in Japan. For the national standard, AIST establishes and manages the standard from 1 Pa to 1 GPa using multiple standard devices. The technological development is being done to enable efficient, high-precision calibration of the standard devices that are difficult to operate, using the digital pressure gauge effectively. For the international comparison of the national standards, the comparison will be done efficiently using the digital pressure gauge for the major pressure ranges. For provision of the standard in Japan, the standard provision method with least burden to the client will be developed. The pressure calibration service by AIST for digital pressure gauge will be expanded. The standard provision system in Japan is advanced to efficiently provide the pressure standard to society and industry, and various related technology standards will be organized.Finally, the efficient standard provision using the digital pressure gauge will improve the reliability of pressure measurement at the industrial sites, which is one of the research objectives, in conjunction with the development of the industrial pressure gauge by the measuring device manufacturers. The international comparison using the digital pressure gauge will greatly contribute to the international mutual recognition of pressure measurement, which is the other research objective. We set such a research Fig. 4 Research scenario for increasing the reliability of pressure measurement and for international mutual recognition Research goalAISTIntegration and synthesis of elemental technologiesInstrument manufacturerLiquid column manometerPressure balanceUncertainty evaluationWeight, sizeMeasurement range, resolutionDigital pressure gaugeDevelopment of industrial pressure gaugeDevelopment of elemental technologyExecution of international comparisonEfficiency of standard provisionPrimary pressure gaugeSecondary pressure gaugeImproved reliability of pressure measurement at industrial sitesInternational mutual recognition of pressure measurementLinearityStability in environmental change and during transportationShort-, long-term stabilityCalibration methodUtilization of digital pressure gauge as standard deviceUpgrading of national standard

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