Computer Science
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2774..283o&link_type=abstract
Proc. SPIE Vol. 2774, p. 283-292, Design and Engineering of Optical Systems, Joseph J. Braat; Ed.
Computer Science
Scientific paper
This paper describes a general approach to the analysis of thermal effects in optical systems. The lenses shape, refractive indices and spacings change with the temperature, changing also the focal length and shifting the image position. The temperature variation can be very critical in infrared systems, because the refractive index of infrared materials is more sensitive to the temperature than that of optical glasses, and there are only few materials allowing a thermal passive compensation. Therefore it is very important to consider the thermal defocusing in choosing the optical configurations. In this work the analysis of defocusing thermal effect is divided in two different parts. In the first part, suitable first order relationships are developed, in order to connect focus shift with temperature and to determine first order configurations, taking into account thermal defocusing. In the second part, a recursive algorithm, implemented in a suitable computer routine, is developed to include, during the raytracing, the thermal defocusing in the aberration set and to control it during the optimization process.
Olivieri Monica
Pieri Silvano
Romoli Andrea
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