Imaging system with wavefront modification and method of...

G - Physics – 02 – B

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G02B 27/00 (2006.01) G02B 27/09 (2006.01) G02B 27/58 (2006.01)

Patent

CA 2701151

An imaging system (10) comprises an objective (1), an image detector (2) placed in an image plane of the objective, and a calculation unit (3) intended for executing a digital processing of an image captured by the detector. The objective is suitable for modifying a wavefront of a radiation which enters the system, so that an illumination on the detector which is produced by a source of the radiation is constant for a large interval of variation of a distance of separation of the source from the objective. The depth of field of the system is thus increased, and the calculation unit can be simplified by using a constant filter. The modification of the wavefront is created by a profile which is invariant under any rotations about the optical axis of the objective.

Un système d'imagerie (10) comprend un objectif (1), un détecteur d'image (2) placé dans un plan d'image de l'objectif, et une unité de calcul (3) destinée à exécuter un traitement numérique d'une image saisie par le détecteur. L'objectif est adapté pour modifier un front d'onde d'un rayonnement qui pénètre dans le système, de sorte qu'un éclairement sur le détecteur qui est produit par une source du rayonnement soit constant pour un grand intervalle de variation d'une distance d'éloignement de la source par rapport à l'objectif. La profondeur de champ du système est ainsi augmentée, et l'unité de calcul peut être simplifiée en utilisant un filtre constant. La modification du front d'onde est créée par un profil qui est invariant lors de rotations quelconques autour de l'axe optique de l'objectif.

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