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This provides a more transparent layout of the user interface in which selections of different geometric entity levels can be viewed in the same window. In version 5.3, however, the edge selection has been moved to a dedicated section in the Settings window for the parent physics feature. In previous versions of COMSOL Multiphysics ®, the edge selection was specified by adding a Reference Edge subnode to the physics feature. Typically, this edge selection is used to indicate the orientation of a diffraction grating or optical component in 3D. Extra Selections in Physics Featuresįor some physics features, such as the Grating, Linear Polarizer, Linear Wave Retarder, and Mueller Matrix features, it is sometimes necessary to specify an edge selection in addition to the boundary selection of the physics feature. Using a Ray Detector it is easy to define filter expressions to show only those rays that hit the absorbing surface (bottom). Rays are released isotropically from a point source and are reflected specularly until they hit an absorbing surface (marked in red). rL_: a logical expression for ray inclusion this can be set in the Filter attribute of the Ray Trajectories plot in order to visualize the rays that connect the radiation source to the detector alpha_: the transmission probability from the release feature to the detector Nsel_: number of transmitted rays from the release feature to the detector.The following variables are defined by an instance of the Ray Detector feature with the feature tag : The feature provides convenient expressions that can be used in the Filter attribute of the Ray Trajectories plot, which allows only the rays that reach a specified set of domains or boundaries to be visualized. It is possible to count all rays or only those rays released by a specific physics feature. Such quantities include the number of rays transmitted and the transmission probability, or the ratio of the number of transmitted rays to the number of released rays. The Ray Detector feature is a domain or boundary feature that provides information about rays arriving on a set of selected domains or surfaces from a release feature. You can specify directions for the photometric horizontal and photometric zero, which indicate the orientation of the lamp according to IES standards.Īs the number of extra time steps in the trajectory plot is increased, the times at which each ray bounces off the wall can be seen more clearly. When the photometric data file is imported into a model, it generates a set of functions that are used to initialize the ray intensity and power as a function of the initial ray direction. To use this feature, select Photometric Data Import for the Intensity initialization in the Total Source Power section of the Release from Grid node. ies file extension, the standard photometric data file format of the Illuminating Engineering Society of North America (IESNA). The Photometric Data File feature supports the. It is possible to specify nonuniform distributions of ray intensity and power by importing photometric data files into a ray optics model. The rays passing through the lens with a shorter focal length decrease in intensity more rapidly past the focal point, so they are terminated by the _Ray Termination_ feature, while the rays passing through the lens with a longer focal length continue to propagate. *Rays propagating through two convex lenses with focal lengths of 200 mm (top) and 100 mm (bottom). This feature can be employed to avoid using excessive computational resources on rays that have become attenuated due to the presence of absorbing media and rays that have extremely low intensity due to interaction with curved surfaces. Beyond geometrical constraints, rays can be terminated if their intensity or power becomes smaller than a specified threshold, or if they stray too far from the model geometry. You can use the Ray Termination feature to discard unnecessary information about the ray paths and remove clutter from the trajectory plots. The rays can be terminated as they exit a bounding box, which can be based on the geometry or user-defined spatial extents. The new Ray Termination feature can be used to annihilate rays without requiring them to stop at a boundary.
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See all of the Ray Optics Module updates in more detail below. For users of the Ray Optics Module, COMSOL Multiphysics ® version 5.3 brings a new Ray Termination feature to eliminate unnecessary rays, functionality to import photometric data, and a new simulation app for designing a solar dish receiver.