Thermal refocusing method for spaceborne high-resolution optical imagers

Date

2016-05-20

Author

Selimoglu, Ozgur
Ekinci, Mustafa
Karci, Ozgur

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We describe the design of a thermal refocusing method for spaceborne high-resolution imagers where Korsch optical design is usually implemented. The secondary mirror is made of aluminum, a high thermal expansion coefficient material, instead of conventional zero-expansion glass ceramics. In this way, the radius of the curvature can be controlled by means of temperature change of the mirror. Change in the radius of curvature also changes the effective focal length of the camera which is used for compensation of the defocus that occurred in space. We show that the 30 mu m despace of the secondary mirror in the optical system can be compensated by an similar to 10 degrees C temperature change of the mirror while the image quality is maintained. (C) 2016 Optical Society of America

Subject Keywords

Optics

URI

https://hdl.handle.net/11511/67059

Journal

APPLIED OPTICS

DOI

https://doi.org/10.1364/ao.55.004109

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Citation Formats

O. Selimoglu, M. Ekinci, and O. Karci, “Thermal refocusing method for spaceborne high-resolution optical imagers,” APPLIED OPTICS, pp. 4109–4112, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67059.