Preface [chapter]

Olfa Kanoun
2018 Energy Harvesting for Wireless Sensor Networks  
Wireless sensors and wireless sensor networks (WSNs) are nowadays becoming increasingly important due to their decisive advantages. They enable mobility and flexibility, and significantly reduce installation and maintenance costs. Different on-going trends towards the Internet of Things (IoT), Industry 4.0 and 5G Networks are based on WSNs. All these trends address massive sensing and admit to having wireless sensors deliver measurement data directly to the World Wide Web in a reliable and easy
more » ... manner. They can only be supported, if sufficient energy efficiency and flexible solutions are developed for energy-aware wireless sensor nodes (WINO). Within system design of wireless sensors, several aspects related to technology, electronics and algorithms need to be considered to reach a high energy efficiency on the node and network level. In the last years, different possibilities for energy harvesting have been investigated and several works have been reported on theoretical and practical applications using these technologies. Generally, special aspects are treated and the overview of these methods remains on the level of personal effort. Writing a book on energy harvesting is a huge work and can be only done in an aim-oriented way. In a previous book Energy Harvesting, we described different technologies and concepts more from the perspective of feasibility to introduce this technology to applications. At the time, the potential of ambient energy was not as clear and evident as it is today. This success is due to the developments towards low power consumption and also towards efficient and suitable converters based on manifold principles and able to generate enough energy. In this book, in addition to these topics, we focus on advanced and novel developments in vibration converters, wireless energy transfer and energy saving methods on the network level. This is no longer from the point of view of feasibility, but with the aim of giving an overview of novel developments that make technologies for using ambient energy and transferred energy to supply sensors realistic. These methods, systems and technologies are enabling technologies for the wide spread use of sensors in general and, especially, in the IoT era. The specific motivation for writing this book is based on the convincement that an interlocked interaction between suitable methods and technologies is necessary to realize optimized solutions for energy aware WSNs. In the last years, this has become more visible with the increasing number of converters, hybrid solutions, energy transfer and energy management methods acting at node and network level. The system design of an energy aware WINO begins with the choice of the suitable available ambient energy, such as solar radiation, vibration and electromagnetic fields and its characterization. Therefore, suitable converters need to be designed and improved in their performance to meet necessary requirements and to reach enough energy to guarantee the function of the WSNs. It is thereby not possible every time to supply a sensor node from just one ambient source. In order to enhance the energy income, a combination of similar or diverse converters can be envisaged. Energy
doi:10.1515/9783110445053-201 fatcat:uvmo5tiss5g5nl4hm333kowguu