Design And Implementation Of A Vibration Monitoring System Based On Wireless Sensor Network

Extreme events like earthquakes can cause sever damage to the health of civil infrastructures which is usually invisible. Such damage may threaten the safety and property of the people. The loss of life and property caused by collapse of civil infrastructures can be effectively reduced, or even avoided through the near real-time structure condition monitoring systems. In addition to the extreme events, the civil infrastructure will undergo gradually deterioration over its life span due to corrosion, fatigue, scour, etc. So, periodic condition monitoring is a very important method to provide information about the soundness of the civil infrastructure over its operational life. Compared with the traditional monitoring systems, the wireless sensor networks have many advantages, such low cost, easy installation, low cost of maintenance and update. Therefore, wireless sensor networks have a very wide range of prospects for application, and have become one of the hottest research field .Thus, under the project of Research and development of bridge wireless monitoring technology founded by the Ministry of Communications, this paper designs a kind of vibration monitoring sensor node, then organizes these sensor nodes into a wireless network for structural health monitoring.This paper mainly introduces the design and implementation of the wireless sensor node and the realization of the wireless communication protocol. The wireless sensor node usually uses battery to supply energy, so the energy is limited. As a result, how to save the energy of the wireless sensor networks is the core issue in the hardware and software design of the network. With the consideration the core issue, the hardware and software are designed in this paper. On the one hand, we choose micro-power chips: the MCU of the nodes is the ultra low energy embedded processor MSP430F149 manufactured by the Texas Instrument Company, and the sensor unit is ADXL105, a monolithic IC accelerometer made by ANALOG DEVICES Company. The analog to digital converter is ADS8325, which is a 16-bit, high-speed, micro-power chip of TI...