The source objects themselves can range from simple point sources (like those used in Sequential Mode) to complex, three-dimensional source distributions. OpticStudio Premium provides a library of several hundred measured sources. Using pure non-sequential ray tracing, sources can be placed anywhere in the non-sequential group, at any orientation, and can even be placed inside of other objects. Non-Sequential Mode allows for more freedom in the definition of your system. In Sequential Mode, you are primarily limited to using point sources located on the OBJECT surface and modelling them using the various image analysis capabilities available. The source modeling capabilities of pure Non-Sequential Mode in OpticStudio are far more comprehensive than Sequential Mode. In addition, source and detector objects are setup within the group to launch and record rays, respectively. When using pure non-sequential ray tracing, all optics to be traced are in a single non-sequential group. Non-sequential ray tracing can be modeled in OpticStudio using one of two modes: Some examples of these optics include: complex prisms, corner cubes, light pipes, faceted objects, objects created in CAD programs and embedded volume objects (i.e. There are many objects that cannot be accurately modelled using single surfaces in Sequential Mode and need to be instead modelled as real, 3D components. Each object is placed globally at an independent x, y, z coordinate with an independently defined orientation. In Non-Sequential Mode, optical components are modeled as true three-dimensional objects, either as surfaces or solid volumes. Rays may hit any part of any non-sequential object, and may hit the same object multiple times, or not at all. The objects that the rays hit are determined solely by the physical positions and properties of the objects as well as the directions of the rays. Non-sequential ray tracing implies that there is no predefined sequence of surfaces which rays that are being traced must hit. If an optical system can be traced with rays, then it can be simulated in OpticStudio's Non-Sequential Mode. This property makes Non-Sequential mode ideal for analyzing stray light, scattering, and illumination for any system type. Non-sequential ray tracing allows rays to propagate through optical components in any order and allows rays to be split, scattered, and reflected back to an object that they've already encountered. If you are working with a system that requires more flexibility, then you will want to use Non-Sequential Mode. This property makes Sequential Mode ideal for analysis of imaging and afocal systems. In Sequential Mode, rays are limited to propagating from one object to the next. A brief overview of some object types and features unique to Non-Sequential Mode is also provided. The advantages of Non-Sequential Mode and mixed mode are discussed. This article is intended to introduce prospective and new OpticStudio users to the suite of capabilities available in Non-Sequential Mode. This article is part of the Getting Started with OpticStudio free tutorial.
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