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Mikhal A.,NASU Institute of Electrodynamics | Warsza Z.,Industrial Research Institute of Automation and Measurements PIAP
Acta IMEKO | Year: 2015

The paper presents the construction of a primary four electrode conductivity cell with calculated constant for the Ukrainian primary standard of electrolytic conductivity (EC). The equations for calculating the cell constant and the error budget for calculating uncertainty are presented. The components of the budget are: errors due to the non-uniformity of the force lines of the electric field; errors due to the accuracy of measurement standards and measuring instruments for determining length and diameter of the tube; and errors due to manufacturing techniques of tubes and their assemblage. The article considers in detail the errors due to the non-ideal profile of the central part of the tube. Two methods to reduce the standard deviation are given: the method of linear interpolation for compensation of the concave form which occurs along the axis of the tube and the method of equivalent triangles to compensate for deviations from a circle that occur across the axis of the tube. © 2015 IMEKO.


Mikhal A.A.,NASU Institute of Electrodynamics | Warsza Z.L.,Industrial Research Institute of Automation and Measurements PIAP | Gavrylkin V.G.,Ukrmetrteststandard
Advances in Intelligent Systems and Computing | Year: 2015

The principle of operation and metrological model of the Ukrainian primary standard of electrolytic conductivity (EC) is presented. The equations for calculating the cell constant and the budget of unknown errors for estimation of the uncertainty B-type are given. Strategies: how to minimize components of this uncertainty are proposed and obtained results, verified by Key Comparisons, are given. © Springer International Publishing Switzerland 2016.


Trzcinka K.,Industrial Research Institute of Automation and Measurements PIAP | Szewczyk R.,Industrial Research Institute of Automation and Measurements PIAP | Ginko O.,Warsaw University of Technology
Advances in Intelligent Systems and Computing | Year: 2014

This paper presents the results disturbing of impact of the factors on the properties of the high resolution analog-to-digital converter. The researches were held for the following operating conditions ADC converter: with battery supply or with switching power supply, for different ambient temperatures, with the optocouplers through the signal lines, with using two different voltage reference source, and with using shield. Of the results of measurements were calculated standard deviation in the number of points. Standard deviation were use it to quantify the impact on the accuracy of the measurements AD converter. © Springer International Publishing Switzerland 2014.


Mikhal A.,NASU Institute of Electrodynamics | Warsza Z.,Industrial Research Institute of Automation and Measurements PIAP
11th IMEKO TC14 Symposium on Laser Metrology for Precision Measurement and Inspection in Industry, LMPMI 2014 | Year: 2014

This report presents a functional diagram of the Ukrainian primary standard of electrolytic conductivity (EC) and construction of primary four electrode conductivity cell with the calculated coupling constant. The equations for calculating the cell constant and budget of errors for calculating uncertainty are presented. The components of budget are: error due to the non-uniformity of the force lines of the electric field; the error due to accuracy of measurement standards and measuring instruments when determining length and diameter of the tube; the error due to manufacturing techniques of tubes and their assemblage. The article considered in details the error due to non-ideal profile of the central part of the tube. The process of precision machining and quality control of the inner surface of the tube are complex and expensive procedures. The report gives an algorithm for measuring of length and diameter of the tube. Experimental data show that distortion of profile may be two types. The first type is deviation of the tube profile from the rectangle along the longitudinal section. The reason is the precession of the grinding tool. The second type is deviation of the profile of the tube from circumference in the cross section. The reason is the presence of wedge-shaped cracks on the inner surfaces of the work piece. The presence of deterministic component in the distortion of the profile leads to a significant increase in the standard deviation of the mean (SDM). The paper presents two methods to reduce the standard deviation: the method of linear interpolation for compensation of the concaveness which occurs along the axis of the tube and the method of equivalent triangles to compensate deviations from the circle that occurs across the axis of the tube.


Frydrych P.,Warsaw University of Technology | Szewczyk R.,Warsaw University of Technology | Szewczyk R.,Industrial Research Institute of Automation and Measurements PIAP | Salach J.,Warsaw University of Technology | Trzcinka K.,Industrial Research Institute of Automation and Measurements PIAP
Mechatronics: Recent Technological and Scientific Advances | Year: 2011

Fluxgate sensors are common used in week and low frequency magnetic field measurements. Recently rapid development of miniature fluxgate sensors made in PCB technology is observed. Until now single core layer sensors were unable to measure magnetic field for two directions. Moreover no modelling results of influence of amorphous alloy chemical composition on sensor properties were available. This paper presents results of tests of functional characteristics of miniature single tape ply fluxgate sensors with two kinds of chemical compositions of amorphous alloys cores: Fe67Co18Si1B14 and Co66Fe4Ni1Si15B14. Sensors were made with seven layer printed board. Cores, which are produced using photolithography technology from single tape ply, has frame shape. Thus they are able to measure independent two perpendicular direction of magnetic field. Excitation and pick up coils are printed on board. Experimental results shown strong dependence of sensor characteristics on chemical composition of core material. It proves that further investigation of material influence on sensor properties and optimisation of cores are strong desired.

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