Underwater time-of-flight laser scanning
Offshore wind turbines and retaining dams have become an essential part in the modern sustainable energy production scheme. These buildings incorporate complex underwater-structures which rely on regular and precise monitoring. As the requirements on resolution and precision cannot be met by sonar-based methods, this is still a manual and labor-intensive task, carried out by human divers. In order to address this issue, we developed an underwater laser-scanner able to record high resolution 3D-data of underwater structures.
In typical measurement scenarios, one often faces challenging conditions with turbid water and many scattering particles. Using the time-of-flight method and a sophisticated data analysis, we can cope with such situations and still achieve precision on the mm-scale. As an additional benefit, our scanner does not only capture the depth information, but also records the full intensity-waveform of each measurement point. This valuable data allows us to extract further meta-information like reflectivity, inclination angle and water quality.