A self-powered and high-frequency vibration sensor with layer-powder-layer structure for structural health monitoring

Vibration sensors greatly benefit medical and healthcare monitoring, environmental monitoring, and structural health monitoring. However, most of them are shadowed by relatively low-frequency vibration response, the narrow operating frequency range, and operational complexity, which hinders their use in wide practical applications. Here, we report a self-powered broadband vibration sensor with a layer-powder-layer structure based on a triboelectric nanogenerator. The internal polytetrafluoroethylene (PTFE) and silver (Ag) micro powder can vibrate under the external vibration stimuli, offering distinct advantages for high-frequency vibration sensing. The high-frequency triboelectric vibration sensor exhibits a significantly broad frequency response range of 3-133 kHz. The highest response frequency is approximately 1-3 orders of magnitude higher than most previously reported triboelectric vibration sensors. Additionally, the HVS shows directional independence, a good frequency resolution of 0.01 kHz, and small hysteresis. With these capabilities, the HVS was demonstrated in burst vibration detection, rail track fracture detection, automobile engine monitoring, and geological exploration applications. The facile and effective vibration monitoring system based on the HVS can provide a platform for various vibration monitoring applications. The self-powered high-frequency vibration sensor is a promising candidate for next-generation vibration sensors.

Automated summary

The newly developed self-powered broadband vibration sensor is capable of effectively detecting high-frequency vibrations with unique features such as a broad frequency response range, directional independence, high frequency resolution, and small hysteresis. The sensor has been verified in multiple applications and holds great potential for wide practical use.