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Proceedings Paper

Characterization of the image quality of a wide angle MWIR f-theta objective lens by means of pixel contrast
Author(s): Bertram Achtner
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Paper Abstract

Objective lenses for missile warning systems have typically a wide field of view of about 120° to 180°. In order to get a linear correlation between object angle w[rad] and image height y[mm] they have a f-theta correction, with the focal length f[mm] as correlation factor. Usually the image quality criteria for optical systems are specified with MTF- or Strehl-values. In this case the image quality is indicated as pixel contrast defined by the amount of energy from a point source falling on one pixel compared to the amount of energy of the same source falling onto the neighboring pixels. The image of a point source from infinity is the Airy disk, which has a circular shape provided that the pupil is also circular. In order to get correct values for quadratic pixels the ensquared energy has to be taken. The size of the Airy disk is correlated to the f/# of the optical system and the wavelength. There is an interconnection between dimension of the optical system, f/#, Airy disk and achievable pixel contrast. These dependencies are discussed for a recently developed 168° field of view objective lens.

Paper Details

Date Published: 17 May 2016
PDF: 7 pages
Proc. SPIE 9822, Advanced Optics for Defense Applications: UV through LWIR, 98220H (17 May 2016); doi: 10.1117/12.2223812
Show Author Affiliations
Bertram Achtner, AIRBUS DS OPTRONICS GmbH (Germany)

Published in SPIE Proceedings Vol. 9822:
Advanced Optics for Defense Applications: UV through LWIR
Jay N. Vizgaitis; Bjørn F. Andresen; Peter L. Marasco; Jasbinder S. Sanghera; Miguel P. Snyder, Editor(s)

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