| 主权项 |
1. An optical imaging system configured for back-scanned imagery comprising:
an imager including a focal plane array; an afocal telescope optically coupled to the imager and configured to receive and collimate electromagnetic radiation and to direct a collimated beam of the electromagnetic radiation via an exit pupil of the afocal telescope to the imager, the imager being configured to focus the electromagnetic radiation onto the focal plane array, and the focal plane array being configured to form an image from the electromagnetic radiation; and a back-scan mirror optically coupled to the afocal telescope and the imager, positioned proximate the exit pupil of the afocal telescope, and configured to backscan the electromagnetic radiation to stabilize the image on the focal plane array, wherein the afocal telescope is configured as a four mirror anastigmat including a primary mirror, a secondary mirror, a tertiary mirror, and a field correcting mirror optically positioned between the secondary mirror and the tertiary mirror, the field correcting mirror being further positioned at an intermediate image plane of the afocal telescope and configured to adjust distortion characteristics of the afocal telescope to control image wander on the focal plane array for off-axis image points during the backscan. |
