Computing the scattering properties of participating media using Lorenz-Mie theory

Abstract

 Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Visualizing underwater ocean optics

“…Our simulations based on radiative transfer approximately match their simulations based on Lorenz-Mie theory. The differences are mainly owed to two factors: on the one hand, the overall darker tone in our images is due to in-water absorption, whereas [FCJ07] renders the surface of the water body; on the other hand, the absence of inelastic scattering effects in [FCJ07] can have a visible influence the final appearance of water, as shown in Figure 4 for the Baltic case. The properties of the water have been adjusted according to measurements found in [BSF * 03] [Mob94] for our bio-optical model and [BSF * 03] in the model by Frisvad et al In both cases, it is only the changes in the constituents of the waters which yield the different colors.…”

“…The changes in color are clearly noticeable, from a darker blue in the case of Atlantic water, to the greener hue in the image of the North Sea. The smaller patches below the first four images correspond to the simulations by Frisvad et al [FCJ07] for the same types of water, and are shown for comparison purposes. Our simulations based on radiative transfer approximately match their simulations based on Lorenz-Mie theory.…”

“…We have additionally studied the influence of the parameters in the apparent optical properties of water in the scene, which are defined by the light field obtained. We have performed an energy-balance analysis, and visual validation of the method has been provided by direct comparison with images by Frisvad et al [FCJ07], rendering different types of waters based on published constituent data.…”

“…Mobley [Mob94] developed a method to solve the RTE analytically, but it cannot be extended to take into account inelastic scattering. Recently, the Lorenz-Mie theory has been generalized and applied to rendering natural waters by Frisvad, Christensen and Jensen [FCJ07], also neglecting the effects of inelastic scattering. Cerezo and Seron [CS04] also develop a bio-optical model.…”

Three-dimensional study of parallel shear flow around an obstacle in water channel and air tunnel

“…1a), the experimental measurements of [8] were based on LIF (laser-induced fluorescence) [9]; for the air tunnel ( Fig. 1b), the physical principle on which it is based the measurement of scalar flow is MSD (Mie scattering diffusion) [10]. As far as we know, the study of shear flows in the presence of obstacle was not sufficiently detailed numerically.…”