A self-powered vibration sensor based on the coupling of triboelectric nanogenerator and electromagnetic generator

Vibration sensor that relies on the mechanical vibration of machinery to monitor its operational stability for the purpose of preventing mechanical failure and reducing the loss of life and property is of desired practical significance. Here, we propose a self-powered mechanical vibration sensor based on the coupling of electromagnetic generator (EMG) for energy harvesting and triboelectric nanogenerator (TENG) for active sensing. For EMG, a magnetic levitation system has been established that can easily respond to tiny external mechanical vibration, and the rationally designed voltage amplifier rectifier circuit as well as corresponding energy storage unit can effectively collect and store mechanical vibration energy. Furthermore, a pendulum-shaped single-electrode mode TENG can respond to vibration in the orthogonal direction and activate the pulse trigger circuit with high sensitivity. The cooperation of the two modules can realize real-time vibration monitoring and alarm signal transmission. The multi-mechanism coupled self-powered vibration sensor reported here can be applied to many scenarios, such as conveyor belt, high-speed train, and freight elevator.