General asphere-conic conformal optical windows

Details General asphere-conic conformal optical windows General asphere-conic conformal optical windows

G - Physics

02

B

G02B 27/00 (2006.01) F41G 7/20 (2006.01) F41G 7/22 (2006.01) G01M 11/02 (2006.01)

Patent

CA 2279952

An optical system (26) includes a window (24) made of a curved piece of a transparent material having an inner surface (28) and an outer surface (30). The inner surface (28) has a nominal inner surface shape defined by a first conicoidal relationship, and the outer surface (30) has a nominal general aspheric surface shape. The optical system (26) also typically includes a sensor (32) and an optical train (36) on the side of the inner surface (28) of the window (24). The accuracy of the shape of the inner surface (28) is tested by directing a coherent light beam through a remote focus (54) of the inner surface (28), reflecting the light beam from the inner surface (28) toward an adjacent focus (52) of the inner surface (28), reflecting the light beam from a spherical reflector (60) at the adjacent focus (52) of the inner surface (28) and back toward the inner surface (28), reflecting the light beam from the inner surface (28) back toward the remote focus (54), and interferometrically comparing the reflected beam arriving at the remote focus (54) with a reference beam.

L'invention concerne un système optique (26) comprenant une fenêtre (24) constituée d'une pièce courbe d'un matériau transparent, qui présente une surface interne (28) et une surface externe (30). La surface interne (28) a une forme nominale définie par une première relation conicoïde et la surface externe (30) une forme nominale généralement asphérique. Typiquement, le système optique (26) comprend un capteur (32) et un train optique (36) disposé sur le côté de la surface interne (28) de la fenêtre (24). Pour tester la précision de la forme de la surface interne (28), on fait passer un faisceau de lumière cohérent par un foyer éloigné (54) de la surface interne (28), on le réfléchit depuis la surface interne (28) sur un foyer adjacent (52) de la surface interne (28), on le réfléchit depuis un réflecteur sphérique (60), situé au niveau du foyer adjacent (52) de la surface interne (28), qui le ramène sur celle-ci, on le réfléchit depuis la surface interne (28) sur le foyer éloigné (54) et on compare par interférométrie le faisceau réfléchi arrivant sur le foyer éloigné (54) avec un faisceau de référence.

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