Electromagnetic Transducer for Measuring the Thickness of the Heat-Resistant Ferromagnetic Film of Turbine Blades

Abstract

This article presents the design features and general modelling of a Hall-effect-based transducer for measuring the thickness of the ferromagnetic coating, capable of operating in a vacuum chamber at a temperature of 300 °C. The calculation of the Hall constant and the potential difference across the sensing element due to the influence of a static magnetic field, with the corresponding distribution of magnetic field strength, magnetic flux density, and voltage, has been performed. The simulation model was built in the Maxwell software based on the finite element method, which confirms the analytically obtained functional dependencies. The significance of the obtained results lies in the possibility of ensuring the specified accuracy and, accordingly, the efficiency of measuring the thickness of the heat-resistant metal film on turbine blades.