Method for obtaining the image of an object, device for...

G - Physics – 01 – B

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G01B 9/02 (2006.01) A61B 5/00 (2006.01) A61B 6/00 (2006.01) G02B 9/06 (2006.01) G02B 23/24 (2006.01) G02B 26/08 (2006.01)

Patent

CA 2487893

The invention relates to studies of internal structures of objects with the aid of optical means. According to the invention an optical system (15) of the delivering device for low coherence optical radiation, in a particular embodiment, an optical fiber probe (8), includes at least two lens components (19), (20), which have a positive focal power and are positioned substantionally confocally. This ensures a constant propagation time for the low coherence optical radiation propagating from a given point of the transverse scanning surface (28) or (39) to a corresponding conjugate point of the image plane (22). That provides elimination of the transverse scanning related aberration of the optical path length for low coherence optical radiation directed towards the object (11) both for a flat transverse scanning surface (28) and for a transverse scanning surface (39) having a curvature. In another embodiment, together with the substantionally confocal arrangement of lens components (19), (20), the longitudinal scanning is performed by varying the optical path length for the low coherence optical radiation propagating from the transverse scanning surface (28) to the optical system (15), i.e., from the end face (17) of the distal part (18) of the optical fiber (14) to the optical system (15). To achieve this, a device for longitudinal scanning (10) is incorporated into the optical fiber probe (8). This ensures a corresponding shift of the focusing position of the low coherence optical radiation during longitudinal scanning, i.e., allows for alignment of the focusing position of the low coherence optical radiation with the position of the coherence gate and, consequently, their simultaneous movement.

L'invention se rapporte à l'examen de la structure interne d'objets par des moyens optiques. Le système optique d'un dispositif destiné à fournir un rayonnement optique de faible cohérence se présente sous la forme d'au moins deux éléments lentilles (19, 20) possédant une puissance optique positive et disposés de manière approximativement confocale. Cette disposition permet de garantir la constance du temps de propagation du rayonnement d'un point donné à la surface (28) du balayage transversal jusqu'au point conjugué correspondant dans un plan image. Ainsi, l'aberration de la longueur du chemin optique du rayonnement dirigé sur un objet examiné est corrigée, ladite aberration étant liée au balayage transversal, que la surface (28) de ce dernier soit plate ou incurvée. Dans un autre mode de réalisation prévoyant également la disposition confocale des éléments (19, 20), un balayage longitudinal est réalisé par une modification de la longueur du chemin optique du rayonnement de la surface (28) au système optique, c'est-à-dire de la surface frontale (17) de la partie distale (18) de la fibre optique au système optique. A cet effet, un dispositif (10) de balayage longitudinal est placé à l'intérieur d'une sonde à fibre optique, ce qui permet de déplacer en conséquence le foyer du rayonnement lors du balayage longitudinal de l'objet examiné, c'est-à-dire de faire coïncider la position du point de concentration du rayonnement et celle d'une fenêtre de cohérence, et, par conséquent, de les déplacer simultanément.

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