Preparation, properties and application research of piezoelectric traffic sensors

AbstractWith increasingly development of traffic construction, development of intelligent traffic sensors has great significance for dynamic monitoring of traffic vehicles. In this research, cement based piezoelectric intelligent traffic sensors were prepared by using PZT piezoelectric ceramic as the sensing element and the mixture of cement and epoxy resin as packaging material, and the linear property, sensitivity, repeating ability and pulse response ability of the sensors were also tested. The results show that sensors have superior pulse response property, high linearity and sensitivity under pulse loading, besides it has also good repeating ability under cycling loading. The traffic flow and traffic velocity were monitored by using the piezoelectric traffic sensors in a testing road. The research shows that the designed piezoelectric traffic sensors can monitor effectively the amount of passerby who pass through the testing road, and that the vehicle velocity can also be obtained accurately according to the pulse response interval of piezoelectric traffic sensors