Device for correcting the total distortion caused by the shape of a transparent wall

Abstract

Device used in aviation for in-flight reception of images corrects distortion resulting from the observation of a field of view through a wall (1) which is transparent in a given spectral band and whose shape distorts the image of the scene formed on a receiver (4). An optical system arranged between the receiver and the wall performs an anamorphotic function in one direction and a deviation function in another direction perpendicular thereto. The deviation function is realized by a single prism formed by two parts (5,6) cemented to one another and which have different refractive indices so as to form an achromatic assembly. The anamorphotic function is obtained by a slight change of the focal length of the receiver in conjunction with the elongation of lines formed by the prism in the direction of the deviation function.

Dependencies are inferred from the claim text.