POSTER SESSION 2
10:30–12:30, Tuesday, September 15
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1092 | POSTER 206
MODELING LASER LIGHT REFLECTION AT DYNAMIC SEA SURFACES
Understanding the scattering characteristics at the water–air interface of the sea surface is crucial for numerous applications, such as remote sensing and safety when employing laser sources in maritime environments. In remote sensing, the bidirectional nature of the water light field introduces errors in ocean color inversion. Therefore, the knowledge of the bidirectional reflectance distribution of water surfaces is of great significance in quantitative remote sensing or for the evaluation of measurement errors in surface optical parameters. We focus on simulating laser light reflection from the dynamic sea surface at a fine scale, emphasizing the importance of quantifying both the amount and direction of reflected laser energy, as these factors vary statistically and are significantly influenced by the dynamics of the wavy sea surface. These dynamics are primarily influenced by wind speed, wind direction, and fetch. To calculate the time-dependent spatial intensity distribution of the laser beam reflected from the dynamic sea surface, a numerical computer model was developed. The reflection characteristics are simulated using an analytical statistical bidirectional reflectance distribution function (BRDF) of the sea surface.
Simulation results show a laser beam in the short wavelength infrared (SWIR) band reflecting off a dynamic sea surface. To increase realism, further simulations show a dynamic sea surface populated with whitecaps, whose evolution depends on wind speed and fetch. Whitecaps strongly influence the reflection characteristics and their coverage was extracted from simulated image sequences across different wind speeds and compared with whitecap coverage functions from literature.
Frederic Schwenger, Fraunhofer-Institute of Optronics, System Technologies and Image Exploitation IOSB, [email protected]
Stefan Kessler, Fraunhofer-Institute of Optronics, System Technologies and Image Exploitation IOSB, [email protected]
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
