ISSN 0021-3454 (print version)
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8
Issue
vol 61 / AUGUST, 2018
Article

DOI 10.17586/0021-3454-2018-61-6-498-506

UDC 535.015

INFLUENCE OF THERMOBARIC PROPERTIES OF THE ENVIRONMENT OF OPTICAL INSTRUMENTS OPERATION ON POSITION AND SIZE OF THE IMAGE

V. A. Zverev
D.S. Rozhdestvensky Optical Society, Saint-Petersburg, 199034, Russian Federation; Professor


S. M. Latyev
ITMO University, Saint Petersburg, 197101, Russian Federation; Professor


I. N. Timoshchuk
ITMO University, Department of Computational Photonics and Videomatics; Associate Professor


Abstract. The problem of analysis of the effect of temperature variations on parameters of optical systems is considered. Relations which determine position and size of the image under the influence of changes in temperature and pressure on the refractive index of the lens material are derived. It is shown that when the lens spherical surface rests on the base surface of the end frame or housing, the changes in the diameter of the contact circle of the contacting parts caused by the temperature fluctuations have a much greater effect than changes in the shape of the surface of the optical element. It is demonstrated that recalculation of the refractive index of the lens material in development of optical systems for instruments designed for the use in outer space is necessary.
Keywords: temperature change, thermo-optical aberrations, temperature coefficient of linear expansion, temperature and pressure effect, defocusing, axial and radial displacement of the elements

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