The hydrofoil that is being monitored is fitted with embedded transducers for generating and receiving guided ultrasonic waves. These transducers will be used to constantly monitor the structure and carry out long-range ultrasonic inspections periodically.
Figure 1. Illustrations of the main concept of TidalSense for the hydrofoils.
For the sail type generators, non-contact electromagnetic transducers will encircle the cable, sending and receiving guided ultrasonic waves. The signals received by the transducers will be acquired by the pulser-receiver unit and transmitted wirelessly to a central data centre where it can be analysed by operators and where automated defect detection and classification algorithms will be used to alert the operator to the presence of defects in the structures that are being monitored.
Figure 2. Illustrations of the main concept of TidalSense for the cables.
Such condition monitoring will greatly increase understanding of the structural integrity of tidal generators, increasing their service life and greatly reducing the risk of unplanned disruptions to power supply.
The project has the following main objectives: