Radomir Majchrowski, Leszek Rozanski, Karol Grochalski
The investigations has been performed in order to choose the specific roughness parameters which would inform the customer about the diffuse emissive and reflective characteristics of the adhesive tapes used in the thermographic measurements. To achieve that, a series of the surface topography parameters of various adhesive tapes (i.e. objects with diffusive reflective characteristics) and various glass plates (i.e. objects with directional reflective characteristics) has been examined.
XXI IMEKO World Congress
· TC12
· 2015
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S. Lorefice, E. Pessana, R. Romeo
A new temperature system based on low cost quartz tuning forks, originally designed to be used in wristwatches, has been arranged for temperature measurements in a wide cryogenic temperature range from 77 K to 273 K. The present paper concerns small quartz crystal tuning forks, with a fundamental frequency of 32768 Hz, as a temperature sensor by measuring the resonance frequency shift caused by an external temperature. Special attention has been given to the methodology, equipment and design to improve the stability in time of the output signal of the quartz tuning fork temperature sensor....
XXI IMEKO World Congress
· TC12
· 2015
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Joohyun Lee, Suyong Kwon, Yong-Gyoo Kim
Reference gas calorimeter was built based on the isoperibolic method. Unlike the other reference gas burner which is usually made of glass, the developed gas burner was made of stainless steel and gross calorific value of methane was measured. The result shows 0.4% difference with the value specified by ISO 6976 and the uncertainty is 1.1%. The metal jacket burner shows the promise of the standardization of the gas burner and development of the portable device.
XXI IMEKO World Congress
· TC12
· 2015
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Suyong Kwon, Joohyun Lee, Yong-Gyoo Kim
New apparatus for evaluation of the figure of merit (ZT) of thermoelectric devices has been developed. ZT value is comprised of three physical quantities, Seebeck coefficient, electrical conductivity, and thermal conductivity. We have already reported ZT evaluation system working from -10 °C to 150 °C. In this study, we present new apparatus for evaluating the ZT value of devices between 150 °C and 700 °C by direct measurement of thermal conductivity using guarded hot plate method.
XXI IMEKO World Congress
· TC12
· 2015
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Yong-Gyoo Kim, Suherlan
The temperature of the Si-SiC eutectic fixed point for use in thermocouple thermometry has been determined. Three Si-SiC cells were fabricated and melting transition was measured using three types of thermocouple: one type S, one type B, and two Pt/Pd thermocouples calibrated at the fixed points of Ag, Cu, Fe-C, Co-C, and Pd (only for type B). The transition temperature, measured using the type S and two Pt/Pd thermocouples, was 1410.0 ± 0.8 °C with k = 2.
XXI IMEKO World Congress
· TC12
· 2015
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Le Chen, Zeyao Wang, Yaqiong Fu, Yunxia Wu, Jianbin Xu
Infrared thermal imager is increasingly used in different fields in production and life, as it possesses the advantages of quick response and non-contact. However, the accuracy of temperature measured by infrared thermal imager is affected seriously by surface emissivity, which limits the use of infrared thermal imager. This paper proposes an on-line measurement of surface temperature by infrared thermal imager based on an infrared target. The experimental results show that the proposed method reduces the error of temperature measurement to about 2%.
XXI IMEKO World Congress
· TC12
· 2015
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Rudolf Palencar, Stanislav Ďuriš, Miroslav Dovica, Jakub Palenčár
Procedure for evaluation of uncertainties of the ITS-90 based on the propagation of distributions using the Monte Carlo method is presented. It is based on generation of pseudo-random numbers for input variables of the multivariate Gaussian distribution. This allows to take into account the correlations between the resistances at the defining fixed points. Assumption of Gaussian probability density function is acceptable with respect to the several sources of uncertainties of resistances.
XXI IMEKO World Congress
· TC12
· 2015
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Ricardo A. N. Ferreira, Denise M. Camarano, Wilmar B. Ferraz, Pablo A. Grossi, Fábio A. Mansur
A research program is in progress at CDTN – Centro de Desenvolvimento da Tecnologia Nuclear, aiming the development of fuel pellets made from a mixture of uranium dioxide microspheres or powder and beryllium oxide powder for increasing the thermal conductivity of the nuclear fuel. This type of fuel promises to be safer than current fuels, improving the performance of the reactor. In previous studies conducted at CDTN, fuel pellets were manufactured and tested considering the following weight percentages: 1, 2, 3, 5, 7 and 14wt.% of beryllium oxide (BeO) in mixture with microspheres of UO 2....
XXI IMEKO World Congress
· TC12
· 2015
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G. A. Ruiz, S. Padilla, J. Sanchez, R. Nava, B. Valera, F. M. Gutierrez
This work describes the process of implementing a quality management system (QMS) in a calibration laboratory at the National Autonomous University of Mexico (UNAM). Experiences since 30 years ago, from the accreditation of the laboratory with the former ISO 25 Guide until the most recent ISO 17025, are shown. The authors analyse how the accreditation impacts on R&D, teaching and customer satisfaction. The main benefits and challenges for ISO 17025 accredited laboratories are also described.
XXI IMEKO World Congress
· TC11
· 2015
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Pavel Neyezhmakov, Stanislav Pivnenko, Sergei Zub
The use of electronic calibration certificates provides a number of advantages. In NSC “Institute of Metrology” (Ukraine) development of electronic system for creation and storage of electronic calibration certificates was started. Also java applet program was developed for the purpose of creation of electronic calibration certificate in PDF with following electronic digital signature. The structure and contents of the certificate are fully compliant with COOMET Recommendation R/GM/15:2007.
XXI IMEKO World Congress
· TC11
· 2015
· Download