Parameters estimations of periodic signal, where frequency of the investigated component is the key parameter in estimations, play a fundamental role in a variety of applications: impedance measurement, power quality estimation, radar, A/D testing, etc. Estimation methods can be classified as parametric and nonparametric ones in the frequency domain. The problem of evaluating the spectral performance of a given periodic signal reduces to the parameter estimation of each spectral component (frequency, amplitude, and phase) in the presence of the noise.
COBISS.SI-ID: 9207636
This article presents research that was conducted in the context of a comparison of measurement standards dew point temperature in the range from -50 ° C to +20 ° C. The results showed that the correlation is very high and in some cases was even less than 0.02 ° C. The survey is the result of several years' work of 18 European national metrology institutes.
COBISS.SI-ID: 8908628
This paper describes the problem of thermographic cameras, which are widely used for accurate measurement of temperature and not just temperature differences, which is more easy. To provide accurate and reliable measurements it is necessary to calibrate the thermal imaging camera, which allows assessment of the entire field of vision. To this end, we created a black body with a large opening, which has better temperature stability and homogeneity as the temperature sensitivity of the detector thermal imaging cameras. Experimental results show that the calibration can be in the range of 10 ° C to 70 ° C with an expanded uncertainty 0.2 ° C, while further research is needed in order to ensure a wider range of calibration. Furthermore, a thermal imaging camera calibration process was developed and tested, and a new ISO standard will be proposed that will set requirements for thermal imaging cameras. Our laboratory is involved in the development of this standard.
COBISS.SI-ID: 9591380
Study examines effects which are specific to measuring the relative humidity with psychrometers. Psychrometers are often used to measure relative humidity, and have certain specifics compared to other hygrometers. In the pilot comparison between the three national measurement institutes (Danish, Finnish and Slovenian) we indentified major sources of measurement error and corresponding sensitivity coefficients intrinsic to psychrometers.
COBISS.SI-ID: 9703764
The Environmental Agency of the Republic of Slovenia (EARS), serving in the frame of the World Meteorological Organization as a Regional Instrument Centre, has organized a round-robin comparison of calibration laboratories of meteorological services in the southeastern part of Europe using instruments for temperature, relative humidity, and barometric pressure. Each participant laboratory had to calibrate a set of instruments at defined calibration points, to evaluate the measurement uncertainty (if possible), and to report the results. EARS RIC invited the National Hydrometeorological Services in the southeastern part of Europe to take part in the intercomparison. In addition, the Laboratory of Metrology and Quality (MIRS/UL-FE/LMK), which holds the Slovenian national standard for temperature and relative humidity, was also invited to participate in the comparison and in the data analysis. Results from MIRS/UL-FE/LMK and EARS were used to calculate the temperature and humidity comparison reference values, while the EARS results were taken as reference values for barometric pressure.
COBISS.SI-ID: 9169748