Optimization Design of Capacitive/Eddy Current Thermal Barrier Coating Thickness Composite Sensor

This paper presents a modeling and design method for a capacitive/eddy-current composite sensor for thermal barrier coating thickness detection. This composite sensor has a smaller size and faster detection speed because it integrates two detection methods in the same sensor. It has the advantage of being non-invasive and radiation-free. The performance of the sensor was studied by the finite element method using Comsol Multiphysics simulation software. The results of the simulation show the variation of the capacitance and the voltage concerning the variation of the layer thickness. Based on this simulation model, the structure of the sensor is modified to achieve the best sensitivity. The simulation results show that the design parameters of the sensor have different patterns of influence on the detection performance of the two modes. Through the comprehensive consideration of the influence law of each factor, it is expected to achieve the improvement of detection performance and guide the optimization of sensor design.