Metrología y Calibración
URI permanente para esta comunidadhttps://inta.metricsalad.com/handle/123456789/64
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Examinando Metrología y Calibración por Materia "Calibration"
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Ítem Acceso Abierto On the characterization of an AHF cavity radiometer and its traceability to WRR/SI(CIEMAT, 2022-02-10) Balenzategui Manzanares, J. L.; De Lucas Veguillas, Javier; Cuenca, J.; Molero, M.; Romero, M. C.; Fabrero, F.; Silva, J. P.; Mejuto, E.; Ibañez, F.J.; Ministerio de Industria, Economía y CompetitividadIn a complementary way to the comparison to WSG to get traceability to WRR (and consequently, to SI), a solar-type cavity radiometer can also be characterized, determining the deviations of the instrument from the ideal realization of the principle of electrical substitution and obtaining its total measurement uncertainty. This work summarizes different techniques and procedures applied for the characterization of an Eppley AHF radiometer. The approach for characterization is based on the analysis of the measurement model function of the instrument. Some results obtained from calibration and testing (voltmeter, area of the precision aperture, resistance of the leads, non equivalence factor), and from numerical simulation (effective absorptance, scattering) are presented. According to these results, current value of standard uncertainty for this instrument is about 0.28% but it is expected that further improvements in the equipment and tests can reduce this figure below 0.1% (1000 ppm) in the near future.Publicación Restringido Practical Calibration of Platinum Resistance Thermometers in the Range −190 °C to 0 °C(Springer Link, 2011-10-22) De Lucas Veguillas, Javier; Benyon Puig, RobertThe results obtained in the characterization of a low-temperature comparator and its performance in relation to the calibration of metal and borosilicate sheathed standard platinum resistance thermometers (SPRTs) calibrated at the International Temperature Scale of 1990 (ITS-90) fixed points, are presented and discussed. The principal influence quantities are addressed and the estimation of measurement uncertainty supporting the calibration and measurement capability (CMC) accredited by Entidad Nacional de Acreditación (ENAC), the Spanish Accreditation Body, are presented and discussed.Ítem Acceso Abierto Report from interlaboratory comparison of air thermometer calibration procedures(Zenodo, 2023-11-24) Olsen, Åge Andreas Falnes; MErlone, Andrea; MacLochlainn, Dubhaltach; García Izquierdo, Carmen; Voldán, Michal; Pavlasek, P.; Oguz Aytekin, S.; Carrol, Peter; Bell, Stephanie; Spahiu, Iska; Hofstätter-Mohler, Christina; Nielsen, Jan; Bergerund Reidun, Anita; Rothmund, Peter; Dobre, Miruna; Van den Berghe, Debby; Bojkovski, Jovan; Raab, Patrick; Mitter, Helmut; Vukicevic, Tanja; Kowal, Alexandra; Dobosz, Justyna; Cohodarevic, Semir; Högström, Richard; Turzó-András, Emese; Simic, Slavica; Giorgin, Eric; Jarosz, Rafal; Kokkini, Evmorfia; Maniur, M. I.; Deschermeier, Regina; Eckerleben, Carolyn; Bubser, Florian; De Lucas Veguillas, Javier; García Gallegos, Jaime; Smorgon, Denis; Holmsten, MagnusThe interlaboratory comparison (ILC) was initiated in 2019 as an important first step in the EURAMET project 1459. The aim of the ILC was first and foremost to gain knowledge later used in developing guidelines for air thermometry, particularly within the realm of calibration and dissemination of the temperature scale. While the ILC protocol asked the participants to report a set of main data that followed a rather strict formular, they were also encouraged to perform different characterisation experiments and to explore different strategies for calibration. The idea was to have a set of common baseline data and analyse them in a traditional ILC framework, but at the same time gather exploratory data that could help advance the knowledge in air temperature metrology. The results were intended to be used as input to guidance documents for the calibration of thermometers for air temperature measurements, and possibly to some initial best practice guides for practical air thermometry in the field.Publicación Restringido The Calibration of Data Loggers for the Characterization of Sterilization Autoclaves(Springer Link, 2011-10-16) De Lucas Veguillas, Javier; Elvira, Gregorio; Fuentes, H.; Benyon Puig, RobertAn experimental setup established for the calibration of temperature and pressure data loggers for use in the characterization of autoclaves and steam sterilizers is described. The results obtained on two devices in the range of 25 °C to 125 °C at absolute pressures from 100 kPa to 375 kPa are presented and discussed in the context of the manufacturer’s specifications and their suitability for on-site characterization of the temperature and pressure conditions during the normal operational cycles. The recommendations on the calibration of these devices and the estimation of the contributions to the expanded uncertainty of measurement for the characterization of autoclaves are addressed.Publicación Acceso Abierto Uncertainty in the Calibration Transfer of Solar Irradiance Scale: From Absolute Cavity Radiometers to Standard Pyrheliometers(Multidisciplinary Digital Publishing Institute (MDPI), 2022-04-02) Balenzategui, José Lorenzo; Molero, María; Silva, José Pedro; Fabero, Fernando; Cuenca, José; Mejuto, Eduardo; De Lucas Veguillas, JavierIn this work, the method for calculation of uncertainty of pyrheliometers’ responsivity during their outdoor calibration process in the laboratory is exposed. It is applied first for calibration of standard pyrheliometers by comparison to cavity radiometers, and after for calibration of an end-user pyrheliometer against that standard pyrheliometer. The dissemination of the WRR irradiance scale is illustrated in practice and the increasing uncertainty in the traceability chain is quantified. The way of getting traceability to both WRR scale and to SI units in the current situation, where the shift between these radiometric scales is pending to be solved, is also explained. However, the impact of this gap between scales seems to be more important for calibrations of reference Class A pyrheliometers than in the final determination of DNI irradiance, because in this case, the cumulative uncertainty is large enough as to not significantly be affected for the difference. The way to take into account different correction terms in the measurement model function, and how to compute the corresponding uncertainty, is explained too. The influence of temperature of some pyrheliometers during calibration process and the potential impact on the DNI irradiance calculated with these instruments is exemplified.
