KEYWORDS: Photons, 3D modeling, Scattering, Monte Carlo methods, Multiple scattering, Computer simulations, Sun, Performance modeling, Data modeling, Reflectivity
In mountainous regions, the radiometric signal recorded at the sensor depends on a number of factors such as sun angle,
atmospheric conditions, surface cover type, and topography. In this paper, a computer simulation model of radiation
transfer is designed and evaluated. This model implements the Monte Carlo ray-tracing techniques and is specifically
dedicated to the study of light propagation in mountainous regions. The radiative processes between sun light and the
objects within the mountainous region are realized by using forward Monte Carlo ray-tracing methods. The performance
of the model is evaluated through detailed comparisons with the well-established 3D computer simulation model: RGM
(Radiosity-Graphics combined Model) based on the same scenes and identical spectral parameters, which shows good
agreements between these two models' results. By using the newly developed computer model, series of typical
mountainous scenes are generated to analyze the physical mechanism of mountainous radiation transfer. The results
show that the effects of the adjacent slopes are important for deep valleys and they particularly affect shadowed pixels,
and the topographic effect needs to be considered in mountainous terrain before accurate inferences from remotely
sensed data can be made.
Experiment methods such as X-ray diffraction, ICP-AES, TEM are adopted to study the relationship between optical properties and inside defects of CVDZnS samples which deposit at different experiment conditions. Through our studies, we draw the conclusion that there inside the material exists a kind of Zn-H associated particle which functioned as optical scatter centers. These scatter centers will lower the transmittance of CVDZnS both in the visible and the IR spectral regions. However, these Zn-H associated particles can be diminished through Hot Isostatic Pressing processing, and after the processing the transmittance of ZnS will substantially improved, especially in the visible spectral region.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.