| Popis: |
In this chapter, a wireless sensor network (WSN) application aimed for monitoring and warning about imminent landslides is presented. It consists of multiple complex measurement nodes (MNs) connected in a radio communication network spread over the area to be monitored. Each node is able to measure two types of parameters: relative soil layers displacement and pore water pressure, each of them mounted at different soil depths. The sensors devoted to measure the above parameters are of original conception and feature very good metrological qualities, especially in terms of displacement sensing sensitivity, which is as low as 1 mm per year. The measurement node structure can be tailored according to the underground layer structure and can include several displacement and pore water pressure sensors that are connected together in a wired local network structure with serial communication. The WSN is coordinated by a gateway, which has the role of general administration of the network resources, data collection and storage and information transmission to the cloud, from where a central server accesses and downloads the data. The whole structure of such a network is detailed in this chapter, starting with sensors description, continuing with the network architecture, communication protocols, data structure, alarms generation, data analysis, power management and ending with the user interface and some results obtained by in-field deploying of the network. |
