Equivalent focal length measurements

Guy Edouard Artzner; Frederic Auchere; Jean-Pierre Delaboudiniere; Jean-Francois E. Hochedez

doi:10.1117/12.360014

27 August 1999 Equivalent focal length measurements

Guy Edouard Artzner, Frederic Auchere, Jean-Pierre Delaboudiniere, Jean-Francois E. Hochedez

Proceedings Volume 3737, Design and Engineering of Optical Systems II; (1999) https://doi.org/10.1117/12.360014
Event: Optical Systems Design and Production, 1999, Berlin, Germany

Abstract

Converting linear coordinates in the plane of the detector of an astronomical instrument to celestial coordinates involves in principle the equivalent focal length of the instrument. However, most methods in astrometry manage to reduce observations in a global manner without actually measuring a focal length. We point out a case for solar space observations where the long term stability of angular distance measurements is better than the ground calibration of the angular value of a pixel. We report and discuss this ground calibration.

Citation Download Citation

Guy Edouard Artzner, Frederic Auchere, Jean-Pierre Delaboudiniere, and Jean-Francois E. Hochedez "Equivalent focal length measurements", Proc. SPIE 3737, Design and Engineering of Optical Systems II, (27 August 1999); https://doi.org/10.1117/12.360014

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