THE INFLUENCE OF EXTERNAL FACTORS ON THE ACCURACY AND RELIABILITY OF THE DETERMINATION OF ULTRA-LOW POWER ELECTRIC FIELDS

Abstract

The article presents the results of an experimental study of the influence of temperature, relative humidity of the surrounding environment, as well as the coefficient of electromechanical action on the process of determining ultra-low power electric fields. The analysis of the obtained results made it possible to establish the most rational conditions for determining the force (electrical tension) and energy (distribution of surface charge and electric capacity) parameters of such fields with higher accuracy and reliability. The paper proposes an experimental experiment to establish the accuracy and reliability of power and energy parameters for determining electric fields under conditions of changes in climatic factors and the electromechanical coefficient, the implementation of which took place on a measuring stand developed with the participation of the authors. The main element of such a measuring stand is an automatic device for determining, collecting and processing information on the distribution of power and energy parameters of the electric field under the sensitive element of the measuring transducer. The results obtained as a result of the experimental research made it possible to establish that the coefficient of electromechanical influence has a decisive influence on the accuracy of measuring electric fields of ultra-low power. It is shown that an increase in the coefficient of electromechanical influence from 38 pN/V (silicon <111>) to 190 pN/V (PZT-8 piezoelectric ceramics) leads to an increase in the relative error of electric field determination by 4.7%. It was established that reducing the temperature to 20 °C while maintaining the relative humidity from 38 % to 74 % leads to a decrease in the relative error by 1.5-2.2 %. At the same time, a decrease in temperature with a simultaneous decrease in relative humidity leads to an increase in the reliability of the determination of electric fields (so, the probability of error-free measurement of power and energy parameters of electric fields increases by 18 %). A comparison of the results obtained by the proposed method with the results obtained by atomic force microscopy method (in the mode of measuring the leakage currents from the working areas of the investigated surfaces) was carried out, which showed a strong positive correlation between these results, which confirms the objectivity of the proposed method and the adequacy of the obtained results. The conclusions and analyzed data obtained in the article based on the results of experimental studies can be used to create a system of automatic error correction and instability determination of power and energy parameters of ultra-low power electric fields, taking into account limiting external influences.