There are different dielectric properties when damage occurs in non-metal composite materials. The planar array capacitive sensor can detect the damage and make it visually available. Based on the planar 44 electrode array structure

the influence of shielding layer and sensor parameters on data measurement and imaging effect is analyzed. The result of simulation and experiment show that the optimum distance between sensor plates is 3 mm. Adding edge shielding and inter-electrode shielding can improve the performance of the sensor. And with the increase of inter-electrode shielding width

the sensitivity uniformity and measurement sensitivity will be greatly improved. The dynamic range of capacitance measurement is reduced. Therefore above all of these can improve the detection capability of the capacitive sensor of the planar array.