Limited coherence stereo ophthalmoscope

A - Human Necessities – 61 – B

Patent

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Details

A61B 3/12 (2006.01)

Patent

CA 2349577

An imaging apparatus for the three dimensional imaging and/or measurement of a surface includes first beam modifying means (9) for modifying an incident beam (2) of short coherence length light to form a modified beam (10) of first (5) and second (6) components having a mutual path difference and being capable of producing a detectable interference. Beamsplitting means (13) splits the modified beam into first (15) and second (14) beams. Second beam modifying means (18) is provided for modifying the properties of at least one of the first and second beams, recombining means (19) thereafter recombining the first and second beams. The apparatus further includes means (22, 24) for directing the recombined first and second beams towards the surface and scanning them across the surface, and means (28, 32, 33, 36) for monitoring the first and second beams after reflection and detecting interference of the reflected first and second beams. A corresponding method is also disclosed.

La présente invention concerne appareil imageur permettant d'obtenir une représentation et des mesures en trois dimensions d'une surface. Cet appareil comprend un premier dispositif (9) qui transforme un faisceau incident (2) de lumière de faible longueur de cohérence en un faisceau modifié (10). Ce faisceau (10) comporte une première (5) et une seconde (6) composante qui présentent une différence de chemin et qui sont capables de produire une interférence détectable. Un second dispositif de modification de faisceau (18) sert à modifier les propriétés d'au moins l'un des premier et second faisceaux, un dispositif (19) permettant ensuite de recombiner ces premier et second faisceaux. L'appareil comprend également des dispositifs (22, 24) permettant de diriger les premier et second faisceaux recombinés vers la surface et de les faire balayer la surface, ainsi que des dispositifs (28, 32, 33, 36) qui surveillent les premier et second faisceau après réflexion et détectent une interférence des premier et second faisceau réfléchis. L'invention concerne également une méthode allant de pair avec cet appareil.

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