This paper describes in detail the spectral responsivity calibration of the Linear Pyrometer of the Thermal Metrology Division (Diter) of Inmetro. This calibration was performed at the Radiometry Laboratory (Larad) of the Optical Metrology Division (Diopt). It was made using two different experimental setups. In the first one, mirrors were used to direct the radiation beam from the exit slit of the monochromator to the entrance of the detectors. In the second setup the detectors were aligned directly in the exit slit of the monochromator. The spectral responsivity values in the first setup...
XVIII IMEKO World Congress · TC12 · 2006 · Download
A hybrid-type surface thermometer combines the contact and non-contact methods, which allows us to overcome the shortcomings of both methods. The hybridtype surface thermometer is a modified radiation thermometer. Temperature measurement using this thermometer is possible within a random error of ±0.5 K at temperatures of around 1000 K. This thermometer provides a useful means for calibration of in-situ temperature measurement in various processes, especially in the semiconductor industry. This paper introduces the basic idea of the hybrid-type surface thermometer, presents experimental...
XVIII IMEKO World Congress · TC12 · 2006 · Download
We report the status of development of metalcarbon eutectic cells for contact thermometry at KRISS. Up to now, Co-C, Ni-C, Fe-C and Pt-C eutectic cells have been fabricated and their performance has been tested. The uncertainty of Co-C melting point using a Type B thermocouple was 0.9°C ( k = 2). The melting plateau of the Fe-C eutectic cell has shown a dependence on the prefreezing set temperature.
XVIII IMEKO World Congress · TC12 · 2006 · Download
The measurement of temperatures above 1100 °C is undergoing a step change improvement with the development of high temperature fixed-points and improved thermocouple types such as Pt/Pd. This paper reviews international developments in these areas that could lead to an improved way of realising ITS-90 above the Ag point, reduced thermocouple uncertainties by factors of two or more, and improved dissemination and measurement of high temperatures to industry.
XVIII IMEKO World Congress · TC12 · 2006 · Download
Denise Camarano, Vinícius S. Moreira, Roberto M. de Andrade
A numerical investigation of zinc freezing point is presented. Comparison of results for the solidification of same alloy using two different sets of data shows the need to have accurate phase-equilibrium data and the necessity of considering all of elements present in an alloy. The results give an indication of what areas require more careful examination if accurate modeling of freezing point is to be accomplished.
XVIII IMEKO World Congress · TC12 · 2006 · Download
Slavolhub G. Petkovic, Paulo R.F. Santos, Antônio C. Baratto, Hamilton D. Vieira ,Renato N. Teixeira, Klaus N. Quelhas
A zinc fixed-point open cell (419.527 °C) was manufactured by the Thermal Metrology Division of Inmetro for the realisation of the International Temperature Scale of 1990 (ITS-90). This paper presents the fixed-point cell design, fabrication method, results of the cell evaluation and the estimated uncertainty assigned to the temperature of the cell.
XVIII IMEKO World Congress · TC12 · 2006 · Download
The joule is proposed to replace the kelvin in the set of SI base units. Arguments in favour of such replacement are presented, including improved standard accuracy and unit system coherence. The joule is also proposed to be added to the quantum metrological triangle (which couples the volt, the ampere and the hertz) to transform the latter into a system called quantum metrological pyramid, that would couple four units rather than three, and allow comparison of the respective standards.
XVIII IMEKO World Congress · TC12 · 2006 · Download
The triple point of xenon has recently been shown to be a suitable fixed point for incorporation into the next revision of the International Temperature Scale as a means to reduce the non-uniqueness in the important 84 K to 273 K range. We summarize the results, which illustrate that the xenon triple point itself is highly reproducible, with a standard deviation of 48 µK for the eight melts of this study, and a total realization uncertainty of just 76 µK.
XVIII IMEKO World Congress · TC12 · 2006 · Download
The traditional approach for the establishment of a metrology infrastructure in other countries has been established as central laboratory, call generically National Metrology Institute (NMI) which has an official recognition to enhance the capacities of measurement of the country or economy. Chile has took the decision to have a Network more than an unique NMI, so at the present time, the structure of the Network is included by 7 magnitudes managed by 6 Institutions, CESMEC (mass and temperature), IDIC (force) and ENAER (pressure), DICTUC S.A. (length), CISA (Liquid Flows) and University of...
XVIII IMEKO World Congress · TC11 · 2006 · Download
Salvador Echeverría-Villagómez, Carmen Marina Trejo-Morales
The paper presents an analysis of the structure and infrastructures of Metrology, Standardization and Accreditation (MSA) for the Water Sector in the 21st Century, from a Mexican perspective. Water is passing from being ‘just’ a vital element to become a key element of interest for societies in every field, from economics to politics and technology. The quality structures and infrastructures of every country in terms of Metrology, Standardization and Accreditation have to respond to the new challenges and demands. The paper analyses the relevant aspects of this sector in the Mexican scene....
XVIII IMEKO World Congress · TC11 · 2006 · Download