A continuous structural health monitoring (SHM) with wireless sensor networks (WSN) allows to determine the condition of constructions and delivers a statement for its durability. In comparison with wire-based networks, a wireless solution is easier and faster to apply, so that the network can be adapted to the construction. It is also more cost-efficient. The health monitoring is separated by the type of data logging into event-based and time-discrete.
Monitoring based on MEMS
The use of Microelectromechanical systems (MEMS) reduces the costs of health monitoring. MEMS are composed of electrical and mechanical components. The captured measurements have to be continuously transmitted via Internet or SMS-protocols. The captured information is transmitted over short distances of decimeters between particular nodes and the base station with the assistance of multi-hop networks. The base station is collecting measurement data, saves it in databanks and executes data analysis, until the data is required by the user. If errors are detected by the data analysis, an alarm notification is triggered. The central unit allows wireless administration, calibration and reprogramming of the sensors to maintain the effectiveness of the system. The data logging and signal processing unit contains a low-voltage microcontroller with integrated A/D-converter und sufficient data memory. 
|Time intervals for time-discrete monitoring |
|Temperature caused strain, tension or displacement||Hour/day|
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