Christoph Werner

Abstract

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.

Curriculum Vitae

Christoph Werner studied Microsystems Engineering at the University of Freiburg where he also received his PhD for his work on tunable frequency synthesizers using whispering gallery resonators. Since the beginning of 2018, he works for the Object and Shape Detection Department at Fraunhofer IPM. His research interest is focused on LIDAR-systems for bathymetry and underwater surveying.