Štefica Celap
Consistency in analysis depends on being aware of a significant change in instrumental response, such as that caused by drift or changes in analytical precision, or both, and taking corrective action. The usual corrective action for drift is standardization. Standardization, however, when there is no real need, ca only broaden the spread of subsequent analyses. One purpose of this practice is to set guidelines that will avoid overstandardization. To control manufacturing processes, there must be confidence that a consistent material is being produced and that the analysis of the material is...
XVIII IMEKO World Congress
· TC8
· 2006
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F. R. Lima, S. N. Y. Gerges, T. R. L. Zmijevski, D. F. Bender
The objective of this paper is to present a model for the calculation of measurement uncertainty for noise attenuation measurements of hearing protector by REAT method. The uncertainty calculation was based on the document: "Guide to expression of uncertainty in measurement" by the International Organization for Standardization, first edition, corrected and reprinted in 1995, Geneva, Switzerland. The uncertainty of each source of error was estimated. The overall uncertainty of the noise attenuation measurement of hearing protectors was calculated for each 1/1 octave band frequency test and...
XVIII IMEKO World Congress
· TC8
· 2006
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Cirilo C.S. Conceição, Luiz Tauhata, Edgar F.O.J. Jesus
The purpose of this work is to propose the implementation of methodology for high-dose measurements using traceable dosimeters related to the international metrology system, and to establish in the country, a standard for high-dose related to industrial irradiation facilities and research irradiators.
XVIII IMEKO World Congress
· TC8
· 2006
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Michael Schulz, Andreas Fricke, Klaus Stock, Ana D. Alvarenga, Hakima Belaidi
Quartz Control Plates used as standards for the quality control of polarimetric and saccharimetric measurements have to be calibrated with low uncertainty. A set-up for this is operated at PTB, and INMETRO is building a similar one. In both set-ups, the null detection of the polarimetric signal is of high importance. A novel procedure for this is proposed and tested which avoids the use of an electronic feedback loop.
XVIII IMEKO World Congress
· TC8
· 2006
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L. C. Alves, J. F. S. Gomes, I. B. Couceiro, G. Rossi, M. Sarotto
As part of the cooperation between two National Standardizing Institutes, Istituto Elettrotecnico Nazionale "Galileo Ferraris" (IEN) and National Institute of Metrology, Standardization and Industrial Quality (Inmetro), a colorimetric material characterization study has been initiated in 1999. With the main purpose of check the preliminary performance of the reference system used in the Radiometry Laboratory of Inmetro, four color samples were measured. On the first stage, the characterization of the samples was done at the IEN using a special goniophotometer, which doesn't need calibration...
XVIII IMEKO World Congress
· TC8
· 2006
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Vanderléa de Souza, Janaína Marques R. Caixeiro, Raquel D. C. Cunha, Laura A. N. Valente, Renata M. H. Borges, Rafael A. L. da Silva
This study simulated the transport and storage conditions of ethanol in water certified reference material (CRM) produced by the Chemical Metrology Division of Inmetro – DQUIM with the purpose to estimate the measurement uncertainty related to stability. The short-term stability study was performed on five different concentrations in terms of g ethanol/100g solution (%) of the ethanol in water CRM: 0.0509%, 0.0890%, 0.1145%, 0.3820% and 0.4960%, at the temperatures of 4 ºC and 60 ºC. On the other hand, the longterm stability study was developed on four different concentrations: 0.0509%,...
XVIII IMEKO World Congress
· TC8
· 2006
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João Cristiano Ulrich, Helena Miho Shihomatsu, Marcos Antonio Hortellani, Jorge Eduardo Souza Sarkis
The uncertainty for methylmercury determination in fish samples by cold vapor atomic absorption spectrometry technique was estimated based in the guide for quantifying uncertainty in analytical measurement of EURACHEM and ISO to the expression of uncertainty in measurement. The expanded uncertainty (9,5%) was obtained with 95% confidence level ( k = 2).
XVIII IMEKO World Congress
· TC8
· 2006
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Marisa Ferraz Figueira Pereira, Walter Link, Antonio Carlos Garcia
The purpose of this paper is to present the results of the development, at the Mechanical Metrology Laboratory – IPT, the capability to calibrate load cells until 2 MN in tension using the pyramidal method. This type of assembly in normally applied for compression. The goal is achieve an uncertainty of 0,05%.
XVIII IMEKO World Congress
· TC8
· 2006
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G. Ruiz, A. Gamboa, B. Valera, R. Nava
The calibration process of a Fizeau interferometer using a liquid reference plane in an accredited secondary laboratory is presented. Influence factors involved, mainly vibration effects, are considered. The interferograms obtained, are then processed by two means: with self- developed software, based on mathematical morphology theory; and with free available web software. For validation, the results of measurement are compared with two previous calibrations made with commercial interferometers. An uncertainty of 26 nm is associated to the calibration process.
XVIII IMEKO World Congress
· TC8
· 2006
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Valter Y. Aibe, Anderson Ilha
A new viscosity traceability chain composed of three capillary viscometers at each chain level is proposed. The correlation matrix between the viscometers at each level can be determined, which enables one to lower the uncertainty relative to the traditional “single-threaded” traceability chain.
XVIII IMEKO World Congress
· TC8
· 2006
· Download