Microwave Structural Health Monitoring of the Grouted Connection of a Monopile-Based Offshore Wind Turbine: Fatigue Testing Using a Scaled Laboratory Demonstrator

Figure 15

Results of the radar measurements for all antenna combinations on November 22. Gray indicates the times when staffs were present in the laboratory. Yellow indicates the times of the fatigue test. The dashed line shows the first visual appearance of water on the surface of the grout and the disappearance of the water (although the surface was still wet afterwards).