Tadej Podgornik, Valentin Batagelj, Jovan Bojkovski, Janko Drnovšek
In this paper the nonlinearity testing of seven resistance instruments used to measure temperature is presented. Tested were four multi-meter type instruments which use the UI method to determine resistance and three resistance bridges that measure resistance as a ratio between a resistance thermometer and a standard resistor. The device used to measure the nonlinearity of the instruments was a RBC100 resistance bridge calibrator. The device is a passive four resistor matrix that enables for 35 different resistances to be generated by parallel/series switching of the four base resistors. The...
XIX IMEKO World Congress
· TC4
· 2009
· Download
Holger Nicklich, Martin Brucke, Michael Mende
Shock exciters available on the market today suffer from a lack of control of the generated shocks. This paper will present a new type of shock exciter developed by SPEKTRA which is based on the well known Hopkinson-Bar but using a piezoelectric actuator to apply the force pulse input (* patent pending). It will be shown that a piezoelectric actuator driven Hopkinson-Bar generates well defined shocks allowing the control of pulse width and amplitude independently over a wide range. Furthermore the spectrum of the applied shocks can be controlled accurately by shaping the input force pulse...
XIX IMEKO World Congress
· TC22
· 2009
· Download
Agnieszka Bialek, Alistair B. Forbes, Teresa Goodman, Ruth Montgomery, Martin Rides, Gerie van der Heijden, Hilko van der Heijden, Gerrit Polder, Krista Overvliet
This paper presents the development of a mathematical model to predict the perception of naturalness for a range of materials, based on an understanding of the relationship between the physical attributes of the material and the human sensory inputs. The work is being carried out under an European Union project called 'Measurement of Naturalness' (MONAT), which focuses on understanding the relationships between the physical properties of natural and synthetic materials and the visual and tactile sensory processes that lead to perceptual judgments of naturalness. Integral to the project is...
XIX IMEKO World Congress
· TC18
· 2009
· Download
Ranny Michalski, Marco Nabuco, Gustavo Ripper
Sound insulation is very important for the acoustic quality of buildings. The Brazilian Association of Technical Standards, ABNT, published a set of standards concerning the evaluation of the performance of buildings up to five floors, ABNT NBR 15755, and sound insulation is one the considered topics. Minimum, intermediate and superior values are presented for some acoustic parameters. In order to make measurements carried out by different professionals comparable with the values established in the standards, the uncertainty of the results shall be expressed. The Guide to the Expression of...
XIX IMEKO World Congress
· TC19
· 2009
· Download
Leszek Rozanski, Stanislaw Poloszyk
The influence of IR radiation diffraction upon geometrical resolution of the IR line scanner has been analysed in the paper. Analysis of IR line scanner properties in band 3 – 5 µm and 8 – 12 µm proved that when applying the aperture diaphragms the influence of the radiant diffraction upon geometrical resolution may be significant. This influence is stronger for larger f numbers N in the applied optical systems. It was shown that for large values of f numbers the thermal resolution of the IR line scanner can be improved by reducing the bandwidth of the electronic system of the scanner,...
XIX IMEKO World Congress
· TC12
· 2009
· Download
Ales Hribernik, Maja Bauman, Aleksandra Lobnik
This research deals with the decolorization of synthetic wastewater prepared with 1:2 metal complex textile dye C.I. Acid Blue 193 by AOP ozonation (O 3 ) and H 2 O 2 /O 3 process. In order to minimize the number of experiments, experiments were performed using the 2 5 factorial design. Five influential parameters were examined: initial dye concentration, ozone flow rate, initial pH value, decolorization time and H 2 O 2 addition. According to the variance test analysis, only the first four parameters and their first and higher order interactions are significant, while the fifth factor, i.e....
XIX IMEKO World Congress
· TC19
· 2009
· Download
Craig Coull, Edmund Spearman, Jason Laidlaw
Ultrasonic gas flowmeters (USM) employing multiple paths and transit time technology are becoming established in the upstream oil and gas industry for custody transfer flow measurement. This is mainly due to the advantages of wider flow range capability, and lower pressure loss over that of conventional differential pressure type flow meters such as orifice plates. It is now more than a decade since ultrasonic meters were first applied to high accuracy gas flow metering, and standards and guidance documents have developed much in this time. However in the area of on-going measurement...
XIX IMEKO World Congress
· TC9
· 2009
· Download
Hamza Alkhatib, Ingo Neumann, Hansjürg Kutterer
The evaluation of uncertainties according to the "Guide to the Expression of Uncertainty in Measurement" is presented in this study based on a novel Fuzzy-random-variables approach. Whereas the classically proposed methods like Monte Carlo techniques treat all uncertainties as having a random nature, the fuzzy technique distinguishes between aleatoric and epistemic uncertainties. The aleatoric components are modeled in a Monte Carlo framework, and the epistemic uncertainties were treated with fuzzy techniques. The applied procedure is outlined showing both the theory and a numerical example...
XIX IMEKO World Congress
· TC21
· 2009
· Download
Daniel Schwind, Torsten Hahn
This paper describes analysis and evaluation of calibration of several force transducer types, each transducer first calibrated by a precision amplifier at 5 V 225 HZ carrier frequency excitation voltage and second by a precision amplifier at 5 V direct current excitation voltage. Some calibrations were made according to ISO 376 in order to determine the uncertainty; much more calibrations were performed in two series with changing amplifier in order to detect the influence of the excitation voltage. There were two goals of the investigation: The first goal was to achieve confidence of the...
XIX IMEKO World Congress
· TC3
· 2009
· Download
Sara Lietz, Falk Tegtmeier, Dirk Röske, Rolf Kumme, Daniel Schwind
This paper deals with the investigation of a new type of force vector sensor developed by Gassmann Testing and Metrology (GTM). The measurements were performed in the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. The new force vector sensor is capable of measuring the main axial force and six secondary components: two side forces perpendicular to the main axis, three axial forces arranged in a triangle parallel to the main axis and furthermore a moment with the main axis of the sensor as axis of rotation. With these components one can describe the force as a vector giving the...
XIX IMEKO World Congress
· TC3
· 2009
· Download