The paper presents and compares the possibilities to estimate the square of the amplitude for better estimation of the signal component power. It has been pointed out the advantage of the weighted DFT interpolations for the amplitude square estimation. Using the Hann window, for which the frequency spectrum is well known, and the three largest local amplitude DFT coefficients gives lower systematical errors in squared interpolated approach or in interpolated squared approach than the energy based approach although the frequency has to be estimated in the first step.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 8346196Group members presented paper The effect of mental stress on psychophysiological parameters, from field of soft/sensory metrology, psychophysiological measurements. Paper was presented on international scientific conference 2011 IEEE International Symposium on Medical Measurements and Applications - MeMeA 2011, which was held from 30th to 31st May 2011 in Bari, Italy.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 8410708Studies of impact of national metrology systems include assessment of Calibration measurement capabilities (CMC) as measures of the metrological performance of the different actors which compose a country‘s national metrology system. Different countries have different capabilities and different constellations of primary & secondary laboratories at various levels in the calibration hierarchy, reflecting both the existing measurement science competence throughout the country as well as the perceived national needs for traceable calibration. Recent research by the authors has examined the CMCs of calibration laboratories and national metrology institutes with economic decision theory, in particular in terms of customer satisfaction and with respect to conformity assessment issues. Optimal strategies for calibration costs, maintenance of national measurement standards, testing and production costs were illustrated in practical examples. The impact of a national metrology institute in national economic terms cannot, of course, be assessed simply in isolation. One needs a complete picture where measurements at the primary laboratory are leveraged up through a continuous chain of successively greater numbers of traceable calibrations at secondary and tertiary laboratories at other levels of the calibration hierarchy of increasing measurement uncertainty. The aggregate costs of providing measurement & testing resources need to be weighed against the benefits in national economic terms. CMCs are an essential instrument to enable conformity assessment both for product safety, legal metrology, quality requirements as well as scientific research. Describing metrological performance not only in technical terms but also in terms of impact facilitates dialogue and mutual understanding between metrologists and stakeholders, be they programme owners; research funders; industrial, regulatory or academic organisations. Therefore providing traceability to SI and assuring dissemination of units to lower levels of uncertainty for all kind of measurements inevitably require pyramidal hierarchical measurement infrastructure having CMCs at the highest level thus providing and facilitating CACs (conformity assessment capabilities) at the lower end of the chain.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 8946772