Using Ray Detectors
A 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. Such quantities include the number of rays transmitted, the transmission probability, and a logical expression for ray inclusion. The feature provides convenient expressions that can be used in the Filter node of the Ray Trajectories plot, which allows only the rays which reach the ray detector selection to be visualized. The following variables are provided by the Ray Detector feature, with the feature tag <tag>:
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<tag>.Ntf is number of transmitted rays from the release feature to the ray detector at the end of the simulation.
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<tag>.alpha is the transmission probability from the release feature to the ray detector.
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<tag>.rL is a logical expression for ray inclusion. This can be set in the Filter node of the Ray Trajectories plot in order to visualize the rays which connect the release feature to the detector.
The Ray Detector feature only creates variables, which do not affect the solution. Therefore, they can be added to a model without the need to recompute the solution, it just needs to be updated. To do this, right click on the Study node and select Update Solution. The new variables described above will be immediately available for results processing.