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This article will demonstrate how to analyze the narcissus effect in infrared systems with cooled detectors. A narcissus image is the image of a cold detector formed by reflection from a surface of the optical system, which when (nearly) in focus produces a dark central spot in the image. {sGEopd8]q
The analysis will start by generating Ghost files with OpticStudio's Ghost Focus Generator, and collecting data about vignetting and transmission for each file. [rWBVfm
Tthe narcissus integral coefficient is calculated based on user input temperature data (housing, detector and ambient). Surface NITD contributions and total NITD results are then displayed in plots and numeric NITD data are written to a text file. )E*f30
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