![]() Hence, narcissus analysis is a very important part of the infrared design procedure with cooled detectors.ĭefining the Narcissus Induced Temperature Difference But changes to these parameters cause the narcissus pattern to return. ![]() This results in a discernable contrast difference on the image if the lens is not designed properly.įor fixed lens positions and housing temperature, this contrast difference can be removed by non-uniformity correction algorithms electronically. Some part of the hot housing irradiance also reaches the detector. ![]() Imperfections in lens coating anti-reflection performance cause the residual cold to return from each lens surface. The narcissus effect is a well-known phenomenon in infrared systems with cooled detectors due to the large temperature difference between the detector and the housing. Surface NITD contributions and total NITD results are then displayed in plots and numeric NITD data are written to a text file. The narcissus integral coefficient is calculated based on user input temperature data (housing, detector, and ambient). ![]() The analysis will start by generating Ghost files with OpticStudio's Ghost Focus Generator and collecting data about vignetting and transmission for each file. 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. This blog post will demonstrate how to analyze the narcissus effect in infrared systems with cooled detectors.
0 Comments
Leave a Reply. |