A flexible piezoelectric sensor embedded in clothing is designed to test the piezoelectric properties of the elbow movements. Based on PVDF electrostatic spinning thin films

encapsulate sensor chip

in order to optimize test performance of sensor

improvements have been made by using multilayer sensing chip structure to increase signal responses of sensor

and record piezoelectric response signals of arm in different bending state. The practical test results show that the double-layer chip structure has obviously advantages of piezoelectric signal responses

and the bending force is more obviously than the piezoelectric signal responses under the positive pressure.