Thickness Measurement for the Surface Thin Coatings of Carbon Fiber Composites Using a Microwave Planar Sensor
Carbon fiber-reinforced composites(CFRP)have been widely used in aerospace manufacturing.The coating thickness of CFRP direct affects the component performance.So,accurate measurement of coating thickness is essential.A scheme for measuring the surface coating thickness of CFRP is proposed,which uses a microstrip line planar resonator based on material perturbation.This sensor has the advantages of small size and low cost.In electromagnetic simulations,the resonance frequency increases with increasing coating thickness.In experiments,thin films are placed on the surface of CFRP to simulate the coating.The experimental results are consistent with that in simulations and the relationship between the resonance frequency offset and the thickness can be well characterized by a quadratic polyno-mial.The thickness of the overburden layer is predicted by the fitted curve obtained from the experiment,with an error within±3%.Also,the prediction for thick coating is accurate,which shows that the proposed sensor has wide applicability in thickness measurement.
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