This article is intended to clarify any confusion between several of the scripting commands that are commonly used for analysis surfaces. Analysis surfaces themselves have three defining parameters, their sampling grid, ray filters, and location in space. They can also be used to generate Analysis...
Read MoreA while ago, I was reading through Joe Geary’s excellent book, “Introduction to Lens Design” 1, and it occurred to me that his first order construction of a Cassegrain telescope could be very easily written up as a BASIC script in FRED. The example file that...
Read MoreIt is important to remember that Analysis Surfaces in FRED only post-process (filter) rays at the end of the raytrace when an analysis is requested. They do not collect ray information during the raytrace, regardless of whether the ray trajectory passes through the analysis grid. ...
Read MoreFRED has many tools for helping the optical engineer determine the contribution and causes of stray light in an optical system including the Image Artifact Diagnostic Tool and the Stray Light Report. The Stray Light Report, for example, provides a detailed report of system scatter...
Read MoreThe purpose of this file is to demonstrate how to display a result dynamically in the 3D view as a calculation is being performed. In this case, the embedded script applies a stepped rotation and tilt to the lens element so that the source ray...
Read MoreMany of our users are aware of the “Show in Visualization View” option available from the Chart pop-up menu after an “Energy” calculation. This feature overlays the results of a calculation at the Analysis Surface position in FRED’s 3D View. In the past, this feature...
Read MoreIn the inaugural video of the FRED Technical Support series, Ryan discusses how to calculate the irradiance on a cylindrical surface. The example used is the absorbing edge of a FRED lens element construct. #01 – FRED Technical Support Series from Ryan Irvin on Vimeo. ...
Read MoreIn this video we discuss how to calculate a ray distribution on a surface which rays intersect during a raytrace using auxiliary ray buffers. An example triplet system is used and the beam footprint is plotted for a filter located between the second and third...
Read MoreRay filters provide a method for sorting through rays in the ray buffer and establishing a set of criteria which must be met in order for a ray to be included in the operation being performed. Understanding how ray filters work is critical for verifying...
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