基于平面电容传感器的热障涂层缺陷检测系统

Planar capacitive sensor is a sensor based on the principle of fringing electric field, with the advantages of one-side access, controllability of signal strength and penetration depth. Planar capacitive sensors are widely used for nondestructive measurement of non-metallic materials. The principle of the planar capacitance sensor was analyzed in this paper, the structure of the thermal barrier coating was described and the sensor structure was optimized with COMSOL finite element simulation software. The defect detection system used for defect detection of thermal barrier coatings in engine blades was designed and the performance of the sensor was tested. The testing results show that the defect detection system which based on flexible planar capacitive sensor can detect the defects in non-metallic materials effectively.)