公开(公告)号：US10969578B2

公开(公告)日：2021-04-06

申请号：US16298589

申请日：2019-03-11

Applicant: RAYTHEON COMPANY

Inventor： David N. Sitter, Jr.

IPC: G02B23/00 ,  G02B27/00 ,  G02B23/04 ,  G02B23/06

Abstract: An unobscured five-mirror afocal telescope includes an aperture configured to direct electromagnetic radiation to first, second, third, fourth and fifth mirrors, each configured to receive electromagnetic radiation and reflect electromagnetic radiation along a beam path. The five mirrors are arranged to sequentially reflect from one another electromagnetic radiation received via the aperture to produce a collimated output beam of the electromagnetic radiation at an exit pupil, with the five mirrors consisting of a three-element objective and a two-element eyepiece. A beam splitter may be disposed between the first mirror and the second mirror to direct short-wavelength electromagnetic radiation toward a device along a separate path.

公开(公告)号：US10690903B2

公开(公告)日：2020-06-23

申请号：US15988088

申请日：2018-05-24

Applicant: RAYTHEON COMPANY

Inventor： David N. Sitter, Jr.

IPC: G02B23/06 ,  H04N5/353 ,  H04N5/232 ,  G02B13/08 ,  G02B13/14 ,  G02B17/08 ,  G02B27/64 ,  G02B27/00

Abstract: Examples are directed to optimal field mappings that provide the highest contrast images for back-scanned imaging methods. The mappings can be implemented for back-scanned imaging with afocal optics including an anamorphic field correcting assembly configured to implement a non-rotationally symmetric field mapping between object space and image space to adjust distortion characteristics of the afocal optics to control image wander on a focal plane array. The anamorphic field correcting assembly can include one or more mirrors or lenses having non-rotationally symmetric aspherical departures.

公开(公告)号：US10394007B2

公开(公告)日：2019-08-27

申请号：US15785564

申请日：2017-10-17

Applicant: RAYTHEON COMPANY

Inventor： David N. Sitter, Jr.

IPC: G02B17/06 ,  G02B13/14 ,  G02B23/02

Abstract: Optimal angular field mappings that provide the highest contrast images for back-scanned imaging are given. The mapping can be implemented for back-scanned imaging with afocal optics including an anamorphic field correcting assembly configured to implement a non-rotationally symmetric field mapping between object space and image space to adjust distortion characteristics of the afocal optics to control image wander on a focal plane array. The anamorphic field correcting assembly can include one or more mirrors having non-rotationally symmetric aspherical departures.

公开(公告)号：US10330929B2

公开(公告)日：2019-06-25

申请号：US15219648

申请日：2016-07-26

Applicant: RAYTHEON COMPANY

Inventor： David N. Sitter, Jr.

IPC: G02B27/00 ,  G02B13/14

Abstract: A method for cross-band apochromatic correction in a multi-element optical system. In one example, the method includes selecting a set of design wavelengths, determining a set of optical materials that are transmissive at each design wavelength, identifying a system of linear equations that describe the multi-element optical system in terms of a normalized optical power over the set of design wavelengths, generating multiple solutions for the system of linear equations, each solution defining a set of design optical materials selected from the set of optical materials and based at least in part on calculating mean squared difference values for wavelength pair combinations of design wavelengths in the set of design wavelengths, determining a merit value for each solution using a merit function, the merit value based on minimizing the mean squared difference values, ranking the merit values of the multiple solutions, and using at least one solution of the multiple solutions to design the multi-element optical system. In some examples, at least one design wavelength is a SWIR wavelength and at least one design wavelength is a LWIR wavelength.

公开(公告)号：US10001636B2

公开(公告)日：2018-06-19

申请号：US15098769

申请日：2016-04-14

Applicant: RAYTHEON COMPANY

Inventor： David N. Sitter, Jr.

IPC: G02B23/06 ,  H04N5/232 ,  H04N5/353 ,  G02B13/08

CPC classification number: G02B23/06 ,  G02B13/08 ,  G02B13/14 ,  G02B17/08 ,  G02B27/0031 ,  G02B27/646 ,  H04N5/2328 ,  H04N5/353

Abstract: Optimal field mappings that provide the highest contrast images for back-scanned and time delay integration (TDI) imaging are given. The mapping can be implemented for back-scanned imaging with afocal optics including an anamorphic field correcting assembly configured to implement a non-rotationally symmetric field mapping between object space and image space to adjust distortion characteristics of the afocal optics to control image wander on a focal plane array. The anamorphic field correcting assembly can include one or more mirrors or lenses having non-rotationally symmetric aspherical departures. For optimal TDI imaging, anamorphic optics are also employed.