Fig. 5: Self-powered ocean environment monitoring system.
From: Ocean wave energy harvesting with high energy density and self-powered monitoring system
a Self-powered ocean environment monitoring system (High-density energy harvesting metamaterials and environmental monitoring software); b the real ocean environment: daytime test environment (wind speed of 4.5 m/s) and nighttime test environment (wind speed of 4.2 m/s); c testing results (red solid line: 00:00–00:10; blue dotted line: 12:00–12:10): (i) spectrum of the wave level; (ii) energy spectral density of the wave; (iii) Output power spectrum of the high-density energy harvesting metamaterial; d Real-time health monitoring results of the ocean environment in one day: (i) turbidity, (ii) conductivity, (iii) pH, and (iv) temperature.
