Miseyk

pp. 370-381

pp. 254-268

The paper considers two- and three- component electrode systems in contact electric field sensors. The design of electrode systems optimally meets the requirements for devices to be set on mobile platforms for specific needs. Electrode systems are characterized by minimum of electrodes used: the number of electrodes outnumbers the registered components of the electric field vector by one. Nearly identical flow conditions in the vicinity of electrodes, geometric symmetry of the electrode system, and electric symmetry of measuring channels are provided. The analytical expressions for the elements of the equivalent circuit of the sensor are obtained, and the pre-processing circuits of useful signals are offered.

Problems of development and design of sensors of the electric field or the density of conduction current in conducting media, without distorting the field being investigated, are considered in this article. Construction of a sensor which doesn’t distort the picture of the field when one brings it into a specified volume of a conductive area was considered on condition that the field is homogeneous. This condition is met when the sensor’s geometrical dimensions are much smaller than the scale of its heterogeneity. Original designs of real electric field sensors with electrolytic water channels which do not distort the field being investigated and allow one to measure both one component of the tension and three components, were considered. Recommendations on selecting geometrical dimensions of water channels were given. Analytical dependences for determining metrological characteristics of such sensors were also obtained.

The author considers problems of designing local transducers of specific electric conduction which are mounted in industrial impact zones. The author obtained the ratio for determining configuration of electrodes in local transducers which provide signal interference compensation. The author proposes a flowchart for transducers measuring electrical conductivity of the medium, on the basis of local transducers which have compensation of signal interference fields and fields of unperturbed medium. A comparative analysis of sensors based on local and integral transducers is given in the article.

This author considers the design of a tuner of medium electric conductivity mounted in an anthropogenic impact zone. Correlations which allow determining the configuration of the position of primary transducer electrodes compensating the noise signal were obtained. A block scheme of the sensor which measures medium electric conductivity was proposed; compensation of signals of the noise field and the field of the undisturbed medium was implemented in the sensor.