Evaluation

Evaluation

It is important for you to understand both the capabilities and limitations of evaluation routines. In the case of ray tracing, it is important for you to understand the meaning of both the input and output data. Some of the evaluation commands, particularly those that use spot diagrams, involve models that relate ray-trace data to measurable quantities such as radial energy distributions or modulation transfer functions. To use these commands successfully, you must not only set up the system properly, including the apertures of the lenses, but also you must trace enough rays through the system to adequately characterize its performance. The calculated data may be meaningless if inappropriate input is used, or if an evaluation is carried out without knowing the applicability of the chosen method.

To help you learn this part of OSLO, this section provides comments about the applicability of various methods, required input data, and the meaning of the output data. A Cooke triplet lens is used to demonstrate typical output from most of the routines.

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