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The analysis of light-rays penetrating transparent media like air and water constitutes a pertinent problem in climatic research and in the development of algorithms for the retrieval of bio-geo-chemical parameters of suspended matter and dissolved pollutants from remotely sensed ocean colour data. On the basis of the neutron transport code TIMOC a visible and near-infrared photon transport code, called PHO-TRAN, has been developed and tested both against a theoretical benchmark of models and on real data. The photon transport allows for reflection, refraction, absorption and all relevant light-scattering models, such as elastic scattering by molecules and strongly forward scattering processes by particulates, in quite general three-dimensional geometries. In some cases it is also possible to solve the adjoint problem, as for example in the case of strongly collimated light sensors with extended sources. PHO-TRAN also offers the possibility to sample first-order derivatives of almost all responses with respect to certain input parameters, like material densities and characteristic constants used in scattering models. This paper describes mainly the benchmarking of the developed Monte Carlo procedures.

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Authors: DOYLE J P, University of London, Imperial College of Science Technology and Medicine, Centre for Environmental Technology, Applied Computation and Modelling Group (GB);RIEF H, JRC Ispra (IT)
Bibliographic Reference: Article: Mathematics and Computers in Simulation, Vol. 47 (1998) pp. 215-241
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