Metrological aspects of determining the electron concentration and the conductivity of a melt using a conductivity sensor

For radiophysics, research into plasma physics is of great interest. During the movement of a hypersonic aircraft, the main physical phenomenon, which radically affects the conditions for the propagation of electromagnetic waves in its vicinity is the formation of a plasma shell around the apparatus due to the ionization of neutral particles. The resulting plasma around a hypersonic aircraft has a very high concentration of electrons and prevents the propagation of electromagnetic waves in space, partially absorbing them and reflecting them from its surface. When measuring the electron concentration, it is necessary to take into account the measurement error. In this article, the error is measured on the basis of expressions obtained for a transmission line whose longitudinal dimension exceeds the wavelength propagating in it. Mathematical model for finding the error in determining the electron concentration and melt conductivity is considered, and an analysis of the optimal combination of sensors is carried out.