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Harvesting friction energy in self-sustaining water motion sensors
A recent study, affiliated with UNIST has engineered a self-sustaining sensor platform to continuously monitor the surrounding environment without having an external power source.
This research has been led by the team of Professor Jaehyouk Choi of Electrical and Computer Engineering at UNIST in collaboration with Professor Wonjoon Choi of Mechanical Engineering at Korea University. The findings, published in the March issue of the prestigious journal, Nano Energy note that the proposed platform is expected to contribute to advanced sensing functions of a self-sustaining system for various targeted-ambient elements.
In the study the research team presented a self-sustaining water-motion-sensing (SS-WMS) platform to monitor and display the time-varying dynamics of water-motion, such as frequency and amplitude, using only the energy harvested from the water-motion itself.
A self-sustaining sensor platform is a core component for Internet-of-Things (IoTs) and smart-grid systems. The existing sensor platforms require energy to operate and display the detected information. Therefore, monitoring, processing, and displaying the minute changes of a targeted-environmental element in a real-time fashion without the use of external power sources or energy storages, like batteries has been challenging.
The research team solved this problem with the use of energy harvesting, an essential technology for permanent sensor platforms. Energy harvesting, also known as energy scavenging, is a technology for the harvesting of energy from various sources in the ambient environment, such as wind, water, light, heat, and mechanical energy for conversion into convenient use electric energy.
“It is virtually impossible to manually power a large number of sensors or periodically replace the batteries,” says Professor Choi at UNIST. “The newly-developed semiconductor circuit is capable of performing multiple functions simultaneously, which include energy harvesting and analysis of dynamics.”
The proposed sensor platform consists of a water-contact-based triboelectric nanogenerator (WC-TENG), a self-sustaining water-motion sensor integrated circuit (SS-WMS IC) on a test printed circuit board (PCB), and a LED array for displaying the detected frequencies and amplitudes of water motion.
“The entire platform operation can be powered solely by the harvested energy from the WC-TENG,” says Professor Choi. “We expect this platform can contribute to the development of new types of self-sustaining sensing platforms for liquids, such as seawater and wave dynamics, rainfall tracking, and permanent liquid-leakage monitoring systems.”
This work has been supported by the Basic Science Research Programs through the National Research Foundation of Korea (NRF), funded by the Ministry of Education and the Ministry of Science, ICT & Future Planning.
Dongjoon Shin,Taeho Seong, Jaehyouk Choi, and Wonjoon Choia, “Self-sustaining water-motion sensor platform for continuous monitoring of frequency and amplitude dynamics,” Nano Energy, (2017).