METHOD FOR DESIGNING OFF-AXIS THREE-MIRROR IMAGING SYSTEM WITH FREEFORM SURFACES
First Claim
1. A method for designing an off-axis three-mirror imaging system with freeform surfaces, the method comprising:
- establishing an initial system, the initial system includes a primary mirror initial structure, a secondary mirror initial structure, and a tertiary mirror initial structure;
keeping the primary mirror initial structure and the secondary mirror initial structure unchanged;
selecting a plurality of first feature rays, the plurality of first feature rays are forward rays tracked from an object space to an image detector; and
calculating a plurality of first feature data points Pi (i=1, 2 . . . K) point by point based on an object-image relationship of the plurality of first feature rays, to obtain a tertiary mirror by surface fitting the plurality of first feature data points Pi (i=1, 2 . . . K); and
keeping the secondary mirror initial structure and the tertiary mirror unchanged;
selecting a plurality of fields and a plurality of second feature rays, the plurality of second feature rays are reverse rays tracked from the image detector to the object space; and
calculating a plurality of second feature data points P′
i (i=1, 2 . . . K) point by point based on an object-image relationship of the plurality of second feature rays, to obtain a primary mirror by surface fitting the plurality of second feature data points.
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Abstract
A method for designing an off-axis three-mirror imaging system with freeform surfaces is provided. A primary mirror initial structure, a secondary mirror initial structure, and a tertiary mirror initial structure are established. A number of first feature rays are selected, while the primary mirror initial structure and the secondary mirror initial structure unchanged. The first feature rays are forward ray tracked from an object space to an image detector. A number of first feature data points are calculated to obtain a tertiary mirror. A number of fields and a number of second feature rays are selected, while the secondary mirror initial structure and the tertiary mirror unchanged. The second feature rays are reverse ray tracked from the image detector to the object space. A number of second feature data points are calculated to obtain the primary mirror.
22 Citations
16 Claims
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1. A method for designing an off-axis three-mirror imaging system with freeform surfaces, the method comprising:
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establishing an initial system, the initial system includes a primary mirror initial structure, a secondary mirror initial structure, and a tertiary mirror initial structure; keeping the primary mirror initial structure and the secondary mirror initial structure unchanged;
selecting a plurality of first feature rays, the plurality of first feature rays are forward rays tracked from an object space to an image detector; and
calculating a plurality of first feature data points Pi (i=1, 2 . . . K) point by point based on an object-image relationship of the plurality of first feature rays, to obtain a tertiary mirror by surface fitting the plurality of first feature data points Pi (i=1, 2 . . . K); andkeeping the secondary mirror initial structure and the tertiary mirror unchanged;
selecting a plurality of fields and a plurality of second feature rays, the plurality of second feature rays are reverse rays tracked from the image detector to the object space; and
calculating a plurality of second feature data points P′
i (i=1, 2 . . . K) point by point based on an object-image relationship of the plurality of second feature rays, to obtain a primary mirror by surface fitting the plurality of second feature data points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification