M. Seo, S. Jeong, J. Park, H. Shin
RAYLEIGH SCATTERING THERMOMETRY AT LOW TEMPERATURE USING NITROGEN AND CARBON DIOXIDE WITH HIGH RAYLEIGH SCATTERING CROSS SECTION AREA

Rayleigh scattering thermometry is a practically applicable non-invasive measurement technique to investigate a gas flow field. Experimental results of Rayleigh scattering thermometry at the low temperature region from 230 K to 310 K are discussed with applying nitrogen and carbon dioxide. More precise measurement can be achieved by applying the carbon dioxide gas with high Rayleigh scattering cross section area. Several issues which should be handled importantly for a closed visualization experiment system at low temperature, such as frost on windows, sealing for insulation, thermal stress-induced polarization, and visualization set-up, are discussed.

D. del Campo, J. Bojkovski, M. Dobre, E. Filipe, M. Kalemci, A. Merlone, J. Pearce, A. Peruzzi, F. Sparasci, R. Strnad , D. Taubert, E. Turzó-András
NOVEL TECHNIQUES FOR TRACEABLE TEMPERTURE DISSEMINATION AN EUROPEAN JOINT RESEARCH PROJECT

In the frame of the European Metrology Research Program (EMRP) a new joint research project focused on the development of new advances techniques for providing improved traceability to the kelvin, to support its wider and simpler dissemination to the users, is being carried out. This project (SIB10 NOTED) is supported by EURAMET and the European Commission as part of the targeted program “SI Broader Scope” aimed to underpin the needed development of the SI system through Metrology R&D for fundamental and applied metrology. This paper presents a general description of the SIB10 NOTED technical program.

M. A. P. Castanho, C. R. Baldo
A STUDY OF INHOMOGENEITIES OF THERMOCOUPLES AND ITS CONTRIBUTION TO THE CALIBRATION UNCERTAINTY CALCULUS

This paper presents a study on the measurement of thermocouple inhomogeneity and its contribution to the calculation of the uncertainty of thermocouple calibration. This study evaluated 26 thermocouples, including noble metal thermocouples (type S, R and B) and base metal thermocouples (type N, K, T and J). The measurements were carried out in alcohol, oil and salt baths, at temperatures from -40 ° C to 420 ° C. In this paper we propose a correlation of inhomogeneity value for each thermocouple type evaluated, considering the temperature range and immersion depth.

AdityaAchmadi, HelmiZaini, HidayatWiriadinata, Seung-Nam Park, GhufronZaid
SPECTRAL RESPONSIVITY MEASUREMENT OF KIM-LIPI STANDARD RADIATION THERMOMETER TRACEABLE TO ABSOLUTE CRYOGENIC RADIOMETER

Measurement of spectral responsivity of KIM-LIPI standard radiation thermometer had been conducted. With several adjustments, the absolute cryogenic radiometer (ACR) setup was utilized as a primary spectral responsivity comparator to carry out the measurement. Output of double monochromator was redirected to enable the measurement. Additional voltmeter is installed in front of the available less accurate meter of the ACR setup to read the low level signal and provide analog output with enough accuracy. The setup provides a good quality of spectrally-selected light for this purpose without the need install a completely new spectral comparator facility. A dynamic range of up to 10⁶ was achieved from the spectral responsivity measurement. The Full-width half maximum (FWHM) of the spectral response is 15 nm, which is 1 nm wider than the stated specification of the filter. Further work is being carried out to improve the accuracy of the monochromator wavelength scale.

Edi Kulderknup, Argo Pandis
MEASURING INSTRUMENTS CALIBRATION NEAR ZERO VALUE

Problem of measuring instruments calibration near zero value exists by accreditation of calibration laboratories. Some calibration laboratories present its calibration capability minimum value as 0 [with measuring unit of quantity g] and others with some deviation Δg from 0. Often it is given as Δg ≈ U(g), where U(g) is the expanded uncertainty. As concrete example can be given air relative humidity measuring instruments calibration, where measuring instrument has in the calibration certificate indication 0.3% relative humidity with expanded uncertainty U = 0.7% relative humidity, (k = 2).
Taking account circumstances that expanded uncertainty U is typically shown with symmetrical distribution, but accordingly to the probability theory the negative probability can’t occur, exists disagreement.
Above was the ground for this paper and presents propositions how the calibration scope is useful to present for minimum value taking account users’ needs and probability theory.