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Autores: Roger Brendo Almeida de Medeiros, Pedro de Araújo Gentil Alencar, Igor Lopes de Andrade

Resumo:Os requisitos básicos para calibração de torquímetros são declarados na norma ABNT NBR ISO 6789:2009, onde são apresentadas as principais características para a calibração como um todo. Contudo, de acordo com essa norma, a forma como escolher e analisar cada um dos fatores que influenciam na incerteza de medição é de responsabilidade do laboratório de metrologia. Portanto, esse artigo tem como objetivo analisar e sugerir fontes de incerteza no método de calibração de torquímetros com célula de carga uniaxial, e calculá-las utilizando o coeficiente de sensibilidade.

Autores: Hellen de Aguiar Souza Marques, Rodrigo P. B. da Costa Félix, Regis Pinheiro Landim

Resumo:Welding is a vital process for the industry, being present in most production chains. However, the absence of general solutions for welding processes becomes an object of study to develop and improve welding techniques and quality inspection tests. The purpose of this work was to metrologically evaluate the welding electrical parameters (voltage, current and electrical power) for the adequate supply of welded specimens for the evaluation project of ultrasonic inspections through machine learning. Initially , we sought to ensure the metrological traceability of measurements through the use of a portable data acquisition system during welding. The data were evaluated quantitatively, through calculation of measurement uncertainties, and qualitatively, through visual inspection and x-ray, showing different results of electrical welding power for each welded specimen. These results demonstrated the possibility of characterizing variations in voltage, current and electrical power, providing electrical limits that allowed obtaining approved specimens.

Autores: Isabele Antunes Dal Pont, Fernando Rodrigues Santos, Perison Pavei Uggioni

Resumo:Este artigo apresenta o desenvolvimento de uma estação meteorológica automática baseada em Internet das Coisas e abastecida por energia solar, tendo como objetivo contribuir com informações meteorológicas locais. A estação é capaz de medir cinco variáveis e integra quatro subsistemas, que realizam a coleta de dados, transmissão sem fio, armazenamento em banco de dados, processamento com computação em nuvem e apresentação das informações por meio de uma aplicação web. Ao final do desenvolvimento foi realizada a calibração do sistema em campo, com a estação em funcionamento. Os resultados obtidos são apresentados neste artigo junto com as conclusões do projeto.

Autores: Regis P Landim, Vinícius C de Oliveira, Helio R Carvalho, Werickson F C Rocha, Rodrigo P.B. Costa-Felix

Resumo:The paper presents the concepts of digital transformation from regarding metrology point of view. Also, the context of digital transformation is illustrated from the historical point of view of the Fourth Industrial Revolution and its economic importance. The main goal of this paper is to present an essential background to understanding digital transformation in metrology and its enabling/disrupting technologies: CPS, IIoT, digital twin, AI, metrology in simulation, cloud computing, metrology cloud, big data, virtual instrumentation, D-SI and DCC.

Autores: Mario Anselmo Pereira Neto, Pedro Henrique Fernandes Diniz, André Gomes Torres, Amaury Roteger de Oliveira, Klaus Natorf Quelhas

Resumo:Despite being classified today as a secondary reference point of temperature, ice point (0.0 °C) is still very important in many thermometry applications due to its simplicity, effectiveness, reproducibility and low cost. Uncertainties as low as some hundreds of microkelvin can be achieved, but it depends on the level of care of the experimental procedure practiced by the laboratory. The Thermometry Laboratory of Inmetro (Later) has adopted for a long time a conservative value available in literature for the uncertainty of the ice point. In order to reach more realistic results, in line with the specific equipment and experimental procedure of the lab, a study on the reproducibility of the ice point realization was conducted, enabling a significant reduction of the uncertainty previously adopted. In addition, from the uncertainty analysis performed, it was possible to show the great importance of the standardization of the ice bath preparation procedure for the achievement of better results.

Autores: BRUNO MASCARENHAS LOZANO, Klaus Natorf Quelhas, Luiz Vicente Gomes Tarelho

Resumo:Fixed-point cells have been used as reference standards in calibrations of the thermocouples and standard platinum resistance thermometers (SPRT) in the Thermometry Laboratory (Later) of Inmetro, reproducing the International Temperature Scale of 1990 (ITS-90). The zinc freezing point (419.527 °C) is one of the 17 defining fixed points defined in the ITS-90. This article presents an open zinc freezing point cell manufactured at Inmetro, describing the constructive characteristics, the manufacture method, the cell evaluations, the comparison with other cells and the estimated uncertainty attributed to the cell temperature.

Autores: Ivan L. M. Silva, Guilherme A Garcia, Luiz Vicente G Tarelho, Walter O. Junior

Resumo:Neste trabalho será apresentado o procedimento utilizado para a verificação do desempenho e ajuste da base de tempo do padrão frequência de quartzo, disciplinado por GPS, que fornece o sinal de 10 MHz utilizado como referência pelo pente de frequências ópticas, que vincula a realização da unidade metro a unidade de tempo do SI, o segundo, dentro da estrutura da nova cadeia nacional de rastreabilidade da unidade da grandeza comprimento.

Autores: Rodrigo Ornelas de Almeida, Edisio Alves de Aguiar Junior, Rodrigo Pereira Félix

Resumo:This study presents a joint operation conducted by Inmetro and IPEM-RJ carried out between June 10th and 14th, 2019 at seven compressed natural gas (CNG) fueling stations with the objective of carrying out a survey on the conditions of the installed meters. This survey observed the conservation conditions of the installed meters and its measurement errors caused by problems in the programming of these meters. Additionally, the economic impact of these measurement errors was also calculated, as well as actions were suggested in order to minimize the problems found.

Autores: Raquel Monteiro Souza, Rodrigo Pereira Barretto da Costa-Félix, André Victor Alvarenga

Resumo: The present paper studied the metrological impact on the ultrasound group velocity in not storing the agar phantoms in the water-glycerol-benzalkonium chloride maintenance mixture. The ultrasonic velocity and the phantom’s thickness were measured by the pulse-echo technique seven times within 45 days, whereas four replicates were carried out under repeatability conditions. The phantom’s thickness did not differ statistically along the days since the normalized error was less than 1.0. Based on the results obtained, one can conclude that the ultrasound group velocity decreased in a logarithmic function along the days.

Autores: Tiago Costa Dourado, Felipe Dias Gomes dos Santos, Ericles William Jesus dos Santos, Robson Luiz Gaiofatto, Rodrigo P.B. Costa-Félix

Resumo:The correlation between ultrasonic pulse velocity (UPV) and the quality of concrete parts is a resource that has been explored for decades. However, the significant variability of production of these constructive materials tends to require more robust techniques for better reliability of results. This work adopts a metrological approach in the correlation of the ultrasonic pulse velocity and the respective compressive strength values through destructive tests, evaluated in the first ages (7, 14, 30, and 90 days). For this analysis, three different concrete mixes were molded into cylindrical shapes, using different proportions of the inputs that make up this material. After undergoing statistical and metrological treatment, the results obtained allowed to identify a similar behavior of UPV growth with the strengths of the concrete samples, especially when analyzing the measurement uncertainty bars. However, it is noteworthy that it is necessary to expand the tests in a more significant number of concrete mixtures. It is expected that the improvement of these tests can help reduce costs and execution times of concrete structures where stripping depends on the strength achieved.