Simple 180o field-of-view F-theta all-sky camera

Zeljko Andreic

doi:10.1117/12.46842

1 October 1991 Simple 180° field-of-view F-theta all-sky camera

Zeljko Andreic

Proceedings Volume 1500, Innovative Optics and Phase Conjugate Optics; (1991) https://doi.org/10.1117/12.46842
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

Abstract

All-sky cameras with field-of-view (FOV) of 180 degree(s) are used in several astronomical and terrestrial applications. In its simplest form, such a camera consists of a simple photographic camera which photographs the image of the sky reflected in a spherical mirror. This design is attractive due to its comparatively low cost, as the spherical mirror has very relaxed tolerances on surface shape and accuracy. However, the image such a camera produces suffers from angular distortion near the edge of the image. If, instead of a spherical mirror, an aspherical one is used, it is possible to eliminate angular distortion and to obtain constant angular magnification over the whole 180 degree(s) FOV. The derivation of the differential equation of the required aspherical surface is outlined, and the results of numerical integration of the equation are described.

Citation Download Citation

Zeljko Andreic "Simple 180° field-of-view F-theta all-sky camera", Proc. SPIE 1500, Innovative Optics and Phase Conjugate Optics, (1 October 1991); https://doi.org/10.1117/12.46842

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