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Featured researches published by Michael Matus.


Metrologia | 2006

On estimation of distribution temperature

P. Rosenkranz; Michael Matus; Maria Luisa Rastello

Distribution temperature is a concept that assigns a temperature to radiation from an incandescent lamp, which has a relative spectral power distribution reasonably close to that of a blackbody radiator. Different least square estimation methods for determination of distribution temperature are compared. Their applicability is discussed with regard to uncertainties of the spectral irradiance data of incandescent lamps. Simulation results are analysed to support theoretical conclusions. Experimental results indicate that the estimation method currently recommended by CIE will lead to feasible results only if the relative uncertainties of spectral irradiance data over the chosen wavelength region can be presumed constant. Otherwise, the use of this estimation method weighted with the relative uncertainties is suggested.


Metrologia | 2010

Final report for the period 2007–2009 on the CCL-K11 ongoing key comparison

Michael Matus; Kaj Nyholm; Alan A. Madej; J.E. Bernard; Jerzy Walczuk; Lucija Crepinšek Lipuš; Héctor A Castillo M; Rene Pichardo Vega; Karina Beatriz Bastida; María Griselda Mingolla; Igor Malinovski; Luiz Tarelho; Ricardo França; Ramiz Hamid; Ersoy Sahin; Marko Katić; Vedran Šimunović; Lennart Robertsson

Lasers from nine national metrology institutes (NMIs) were compared as part of the CCL-K11 ongoing key comparison, initiated by the 13th meeting of the Comite Consultative des Longeurs (CCL) in 2007. The absolute frequency of the f component of the R(127) 11–5 transition of molecular iodine was measured for these lasers following the technical protocol for CCL-K11. The results of these measurements are compiled in the present report. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).


Metrologia | 2016

Calibration of surface roughness standards: Key Comparison EURAMET.L-K8.2013

R Thalmann; A Nicolet; F Meli; Gian Bartolo Picotto; Michael Matus; L Carcedo; Björn Hemming; O Ganioğlu; Leonardo De Chiffre; F Saraiva; Sten Bergstrand; S Zelenika; A Tonmueanwai; C.S. Tsai; W Shihua; O Kruger; M M de Souza; J A Salgado; Z Ramotowski

The key comparison EURAMET.L-K8.2009 on roughness was carried out in the framework of a EURAMET project starting in 2009 and ending in 2011. It involved the participation of 14 National Metrology Institutes from Europe, North America, Central America, South America and Africa representing three regional metrology organisations. Four surface texture standards of different type were circulated and on each of the standards several roughness parameters according to the standard ISO 4287 had to be determined. 27 out of 171 individual results were not consistent with the reference value. After some corrective actions the number of inconsistent results could be reduced to 24, which correspond to about 14% of the total. In addition to the material standards, two soft-gauges were circulated, which allow to test the software of the instruments used in the comparison. The comparison results help to support the calibraton and measurement capabilities (CMCs) of the laboratories involved in the CIPM MRA. == Main text To reach the main text of this paper, click on Final Report [http://www.bipm.org/utils/common/pdf/final_reports/L/K8/EURAMET.L-K8.PDF] . Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/ [http://kcdb.bipm.org/] . The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).


Metrologia | 2012

Final report on inter-RMO Key Comparison EUROMET.L-K5.2004: Calibration of a step gauge

Emilio Prieto; Nicholas Brown; Antti Lassila; Andrew Lewis; Michael Matus; Georges Vailleau; Leonardo De Chiffre; Gerard Kotte; Mikael Frennberg; Howard McQuoid; Vít Zelený; Z Ramotowski; Edit Bánréti; Alexandru Duta; Gian Bartolo Picotto; Kostadin Doytchinov; José Carlos Valente de Oliveira; Miguel Viliesid Alonso; Konstantin Chekirda

The results of the inter-RMO key comparison EUROMET.L-K5.2004 on the calibration of a step gauge are reported. Eighteen National Metrology Institutes and one Designated Institute from four different metrological regions all over the world participated in this comparison which lasted three years, from December 2004 to December 2007. A lack of stability was observed through the shifting of some of the inserted gauges. In order to save the comparison and get valuable and useful conclusions, it was agreed to exclude four gauges from calculation and assume that only seven gauges were reasonably stable so as to get the corresponding reference values. It was also agreed to divide the participants into two groups, analyze separately their results and, taking the pilot as the linking laboratory, refer the results to common reference values. The inverse-variance weighted mean was taken as reference value. Due to the significant instability of the step it was also considered an artefact uncertainty. The reported uncertainties ranged from 0.045 ?m to 1.2 ?m (k = 1). The uncertainty of the artefact ranged from 0.018 ?m (for the 20 mm face) to 0.176 ?m (for the 400 mm face). The compatibility of all participants for measuring step gauges was demonstrated with the only exception of a participant showing very high systematic (both positive and negative) errors. Five participants communicated higher uncertainties than the corresponding approved CMCs. A set of Recommendations and Actions were agreed therefore. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).


Metrologia | 2016

Measurement of gauge blocks by interferometry

Michael Matus; S Haas; H Pirée; V Gavalyugov; D Tamakyarska; Rudolf Thalmann; Petr Balling; J Garnaes; Jan Hald; N Farid; Emilio Prieto; Antti Lassila; J A Salgado; Andrew Lewis; C Bandis; V Mudronja; Edit Bánréti; A Balsamo; P Pedone; R H Bergmans; Helge Karlsson; Z Ramotowski; L Eusebio; F Saraiva; Alexandru Duta; S Zelenika; S Bergstrand; Roman Fira; Tanfer Yandayan; D Sendogdu


Metrologia | 2017

Final report on the EURAMET.M.FF-K4.2.2014 volume comparison at 100 μL—calibration of micropipettes

Elsa Batista; Michael Matus; Zoe Metaxiotou; Maria Tudor; Elżbieta Lenard; Oliver Buker; Per Wennergren; Erinda Piluri; Mariana Miteva; Martina Vicarova; Alena Vospĕlová; Urska Turnsek; Ljiljana Mićić; Lise-Lote Grue; Mirjana Mihailovic; Anastazija Sarevska


Metrologia | 2017

Supplementary comparison EURAMET.L-S22, calibration of gauge blocks by mechanical comparison

Andrew Lewis; Lauri Lillepea; Michael Matus; Emilio Prieto; Bojan Ačko; Maria Svendsmark Hansen; Paul Turner; Nicola Testa; Anouar Daoud; Chekir Montassar; Larisa Švedova; Jan Hald; Lilijana Gaidamovičiūtė; Gordana Bajic


Metrologia | 2017

Supplementary comparison EURAMET.L-S25 (#1354) comparison of pocket type laser distance measuring instruments

Emilio Prieto; Mar Pérez; Juan A Ruíz; Michael Matus; Gerard Kotte


Metrologia | 2016

KEY COMPARISON Measurement of gauge blocks by interferometry

Michael Matus; S Haas; H Piree; Gavalyugov; D Tamakyarska; R Thalmann; P Balling; J Garnæs; J Hald; N Farid; E Prieto; Antti Lassila; J A Salgado; A Lewis; C Bandis; Mudronja; E Banreti; A Balsamo; P Pedone; R Bergmans; Helge Karlsson; Z Ramotowski; L Eusébio; F Saraiva; A Duta; S Zelenika; Sten Bergstrand; R Fira; T Yandayan; D Şendoğdu


Metrologia | 2016

KEY COMPARISON Calibration of surface roughness standards

R Thalmann; A Nicolet; F Meli; Gian Bartolo Picotto; Michael Matus; L Carcedo; Björn Hemming; O Ganioğlu; L. De Chiffre; F Saraiva; Sten Bergstrand; S Zelenika; A Tonmueanwai; C L Tsai; W Shihua; O Kruger; M M de Souza; J A Salgado; Z Ramotowski

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Antti Lassila

Centre for Metrology and Accreditation

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Björn Hemming

Centre for Metrology and Accreditation

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Lennart Robertsson

International Bureau of Weights and Measures

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O Ganioğlu

Scientific and Technological Research Council of Turkey

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Andrew Lewis

National Physical Laboratory

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Helge Karlsson

Norwegian Metrology Service

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Kaj Nyholm

University of Helsinki

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Alan A. Madej

National Research Council

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