Low-frequency wireless accelerometer to bridge health monitoring

According to the requirements and characteristics of the long-span bridge vibration monitoring, this paper presents one kind of low-frequency wireless accelerometer monitoring system based on PIC and MEMS (Micro-electromechanical Systems) acceleration sensor. The system was composed of sensor module, data acquisition and processing module, micro-processing module, wireless transmitting and receiving module, and a computer system. Model 1221 was the sensor chip, the measure data processed by MCU, and transmitted by wireless transmitting module based on Zigbee networks. As the date was received by the wireless receiving module, re process the sensing data by computer, to get the vibration parameter and assess the vibration. The system was validated with standard vibrator.