-
公开(公告)号：US11567309B2
公开(公告)日：2023-01-31
申请号：US16869206
申请日：2020-05-07
Applicant: RAYTHEON COMPANY
Inventor： David N. Sitter, Jr.
Abstract: An on-axis four mirror anastigmat telescope includes an entrance pupil configured to receive light from an image, and a mirror assembly. The mirror assembly has a first reflective surface having a central aperture formed therein, a second reflective surface, a third reflective surface having a central aperture formed therein, a fourth reflective surface, and an aperture stop. The mirror assembly is configured to receive light from the image on a common axis and to reflect the light successively by the four coaxial reflective surfaces through the aperture stop. The telescope further comprises a detector configured to receive light from the mirror assembly. The central aperture formed in the first reflective surface defines a field stop to limit the field of view.
-
公开(公告)号：US11640079B2
公开(公告)日：2023-05-02
申请号：US16937224
申请日：2020-07-23
Applicant: Raytheon Company
Inventor： David N. Sitter, Jr.
IPC: G02F1/1335 , G02B27/28
Abstract: A beam splitter configured to split incident light includes a polarization grating having a liquid crystal layer and a reflective sub-aperture beam splitter. The liquid crystal layer is configured to switch between an “on” state and an “off” state in response to an applied voltage. In the “off” state, the polarization grating angularly deviates and polarizes a portion of received incident light passing therethrough. In the “on” state, crystals of the polarization grating align with the incident light, allowing it to pass therethrough unimpeded and unpolarized. The beam splitter includes a plurality of sub-aperture mirrors which are spaced at randomly varying distances from one another, the mirrors being configured to reflect a portion of the incident light.
-
公开(公告)号：US10401499B2
公开(公告)日：2019-09-03
申请号：US15072214
申请日：2016-03-16
Applicant: Raytheon Company
Inventor： Joseph Marron , Maurice J. Halmos , Justin S. Grayer , Gamze Erten , David N. Sitter, Jr.
IPC: H04N7/18 , G01S17/89 , H01S3/00 , H04N5/33 , G01S7/48 , G01P3/36 , G01S17/58 , F41H13/00 , G01S17/66 , G01S7/481 , G01S7/497 , G01S7/491
Abstract: A laser beam projection system builds on a coherent imaging to project a tightly focused laser beam onto a remote object. Coherent flood illumination and local oscillator (LO) illumination are based on one master oscillator. The coherent flood illumination is directed toward a remote object, with a second laser beam directed onto an aimpoint on the same object. A Doppler sensor provides Doppler shift data used to produce Doppler-shifted LO illumination received by a focal plane array, together with the return flood illumination. Interference between the Doppler-shifted LO illumination and the return flood illumination facilitates imaging the object despite the velocity. The wavefront error of the flood illumined remote object image is computed and compared to the desired wavefront of the second laser beam at the aimpoint, with the difference applied to a deformable mirror to shape the second laser beam wavefront for obtaining a desired aimpoint intensity profile.
-
公开(公告)号：US10996336B2
公开(公告)日：2021-05-04
申请号：US14988476
申请日：2016-01-05
Applicant: Raytheon Company
Inventor： Joseph Marron , Maurice J. Halmos , Justin S. Grayer , David N. Sitter, Jr. , Gamze Erten
Abstract: A coherent imaging system produces coherent flood illumination directed toward a remote object and local oscillator (LO) illumination derived based on a same master oscillator as the flood illumination. A Doppler sensor receives the LO illumination and a return of flood illumination reflected off the object. Doppler shift data from the Doppler sensor, corresponding to a longitudinal velocity of the object relative to the imaging system, is used to produce Doppler-shifted LO illumination received by a low bandwidth, large format focal plane array (FPA), together with the return illumination from the object. Interference between the Doppler-shifted LO illumination and the return illumination facilitates producing an image of the object with the low bandwidth FPA despite the longitudinal velocity. Pixel intensities from the FPA are integrated over a period approaching the maximum interference frequency. The Doppler sensor and FPA may concurrently process return for a high energy laser target spot.
-
公开(公告)号：US10754038B2
公开(公告)日：2020-08-25
申请号：US16403821
申请日：2019-05-06
Applicant: Raytheon Company
Inventor： Joseph Marron , Maurice J. Halmos , Justin S. Grayer , Gamze Erten , David N. Sitter, Jr.
IPC: H04N7/18 , G01S17/89 , H01S3/00 , H04N5/33 , G01S7/48 , G01P3/36 , G01S17/58 , F41H13/00 , G01S7/481 , G01S7/4912 , G01S7/497 , G01S17/66
Abstract: An apparatus includes at least one processor configured to determine a wavefront phase profile of return illumination reflected from a remote object, where the wavefront phase profile is based on interference between Doppler-shifted local oscillator (LO) illumination and the return illumination. The at least one processor is also configured to calculate a wavefront error based on a comparison between (i) the determined wavefront phase profile of the return illumination and (ii) a desired wavefront phase profile of a high energy laser (HEL) beam. The at least one processor is further configured to control a deformable mirror to at least partially compensate the HEL beam for the calculated wavefront error.
-
Patent Agency Ranking
公开(公告)号：US12292547B2
公开(公告)日：2025-05-06
申请号：US17207350
申请日：2021-03-19
Applicant: Raytheon Company
Inventor： David N. Sitter, Jr.
Abstract: A device includes an entrance pupil configured to receive light from a distant source. The device also includes an exit pupil configured to output the light to at least one component of an imaging system. The device further includes a plurality of lenses disposed optically between the entrance pupil and the exit pupil, where the lenses are grouped into an objective group and an eyepiece group. In addition, the device includes a housing surrounding the lenses and formed of a housing material. The lenses are formed of one or more lens materials selected based on a thermo-optical coefficient of the one or more lens materials and a coefficient of thermal expansion (CTE) of the housing material. The lens materials can be selected to have a thermo-optical coefficient that is closest to the CTE of the housing material among thermo-optical coefficients of a plurality of possible lens materials.
-
公开(公告)号：US20220026727A1
公开(公告)日：2022-01-27
申请号：US16937224
申请日：2020-07-23
Applicant: Raytheon Company
Inventor： David N. Sitter, Jr.
Abstract: A beam splitter configured to split incident light includes a polarization grating having a liquid crystal layer and a reflective sub-aperture beam splitter. The liquid crystal layer is configured to switch between an “on” state and an “off” state in response to an applied voltage. In the “off” state, the polarization grating angularly deviates and polarizes a portion of received incident light passing therethrough. In the “on” state, crystals of the polarization grating align with the incident light, allowing it to pass therethrough unimpeded and unpolarized. The beam splitter includes a plurality of sub-aperture mirrors which are spaced at randomly varying distances from one another, the mirrors being configured to reflect a portion of the incident light.
-
8.发明授权公开(公告)号：US10379337B2
公开(公告)日：2019-08-13
申请号：US15988081
申请日：2018-05-24
Applicant: RAYTHEON COMPANY
Inventor： David N. Sitter, Jr.
Abstract: Examples are directed to optimal field mappings that provide the highest contrast images for time delay integration (TDI) imaging systems and methods. The mapping can be implemented for line-scanned imaging with optical systems 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 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.
-
9.发明授权Afocal telescope configured as three or four mirror anastigmat for back-scanned imagery 有权非焦距望远镜配置为三个或四个镜像反射扫描图像公开(公告)号：US09482853B2
公开(公告)日：2016-11-01
申请号：US13779279
申请日：2013-02-27
Applicant: Raytheon Company
Inventor： David N. Sitter, Jr.
CPC classification number: G02B17/0642 , G01S3/781 , G01S3/786 , G02B13/146
Abstract: An afocal telescope configured for back-scanned imagery including a three mirror anastigmat and an optical element positioned proximate an intermediate image plane of the three mirror anastigmat and configured to adjust distortion characteristics of the afocal telescope to control image wander on a focal plane array. The optical element may be a field correcting lens or mirror, for example.
Abstract translation: 配置用于后扫描图像的无焦望远镜，包括三镜反射镜和位于三镜反射镜的中间像平面附近的光学元件，并被配置为调节无焦望远镜的失真特性以控制焦平面阵列上的图像漂移。 例如，光学元件可以是场校正透镜或反射镜。
-
公开(公告)号：US11874378B2
公开(公告)日：2024-01-16
申请号：US17232863
申请日：2021-04-16
Applicant: Raytheon Company
Inventor： Joseph Marron , Maurice J. Halmos , Justin S. Grayer , David N. Sitter, Jr. , Gamze Erten
CPC classification number: G01S17/89 , G01S7/4812 , G01S17/58 , F41H13/005
Abstract: A coherent imaging system produces coherent flood illumination directed toward a remote object and local oscillator (LO) illumination derived based on a same master oscillator as the flood illumination. A Doppler sensor receives the LO illumination and a return of flood illumination reflected off the object. Doppler shift data from the Doppler sensor, corresponding to a longitudinal velocity of the object relative to the imaging system, is used to produce Doppler-shifted LO illumination received by a low bandwidth, large format focal plane array (FPA), together with the return illumination from the object. Interference between the Doppler-shifted LO illumination and the return illumination facilitates producing an image of the object with the low bandwidth FPA despite the longitudinal velocity. Pixel intensities from the FPA are integrated over a period approaching the maximum interference frequency. The Doppler sensor and FPA may concurrently process return for a high energy laser target spot.
-
-
-
-
-
-
-
-
-
Search Results
15
records
(took 0.012 seconds)
