IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0111605
(2011-05-19)
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등록번호 |
US-8759735
(2014-06-24)
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발명자
/ 주소 |
- Cook, Lacy G.
- Wheeler, Bryce A.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
3 |
초록
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Various embodiments provide a sensor system including a first optical sub-system having a first plurality of optical elements, and a second optical sub-system having a second plurality of optical elements including a first mirror. The second optical sub-system is configured to rotate about a first a
Various embodiments provide a sensor system including a first optical sub-system having a first plurality of optical elements, and a second optical sub-system having a second plurality of optical elements including a first mirror. The second optical sub-system is configured to rotate about a first axis relative to the first optical sub-system and the first mirror is configured to rotate about a second axis substantially perpendicular to the first axis. The first axis and the second axis are arranged so as not to intersect each other so as to maximize a field of regard of the sensor system.
대표청구항
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1. A sensor system comprising: a first optical sub-system comprising a first plurality of optical elements; anda second optical sub-system comprising a second plurality of optical elements including a first mirror and an afocal fore-optics configured to receive radiation from the first mirror and to
1. A sensor system comprising: a first optical sub-system comprising a first plurality of optical elements; anda second optical sub-system comprising a second plurality of optical elements including a first mirror and an afocal fore-optics configured to receive radiation from the first mirror and to transmit the radiation towards the first optical sub-system, the second optical sub-system configured to rotate about a first axis relative to the first optical sub-system and the first mirror configured to rotate about a second axis substantially perpendicular to the first axis;wherein the first axis and the second axis are arranged so as not to intersect each other so as to maximize a field of regard of the sensor system, and wherein the first axis is substantially parallel to a radiation beam output by the afocal fore-optics. 2. The system of claim 1, further comprising a window, wherein the first axis and the second axis are arranged so as not to intersect each other so as to reduce a size of the window. 3. The system of claim 2, wherein the window is part of the second optical sub-system. 4. The system of claim 2, wherein the window is part of the first optical sub-system. 5. The system of claim 1, wherein the first optical sub-system is mounted to a body. 6. The system of claim 5, wherein the body is a body of an aircraft. 7. The system of claim 1, wherein the first mirror is a coelostat mirror, wherein the second axis forms an angle of approximately 45 deg. relative to the plane of the coelostat mirror and the second axis is parallel to a beam of radiation reflected by the coelostat mirror. 8. The system of claim 1, wherein the second plurality of optical elements includes a fold mirror configured to reflect radiation received from the first mirror towards the afocal fore-optics. 9. The system of claim 1, wherein the second plurality of optical elements comprises a bypass mirror and a wide field-of-view insert mirror configured and arranged to be movable so that radiation from the first mirror bypasses the afocal fore-optics. 10. The system of claim 9, wherein when radiation passes through the afocal fore-optics a relatively narrow field of view is achieved and when the afocal fore-optics is bypassed using the bypass mirror and wide field of view insert mirror a wider field of view is achieved. 11. The system of claim 1, wherein a coude path between the second optical sub-system and the first optical sub-system is less than or equal to approximately half an aperture size defined by a size of the first mirror so as to reduce jitter errors or line of sight errors, or both. 12. The system of claim 1, wherein a ratio of cylinder diameter swept volume size of the second optical sub-system to aperture size of the system is about 2.5:1. 13. The system of claim 1, wherein a rotation of the first mirror about the second axis provides a travel of the field of regard in an elevation direction. 14. The system of claim 13, wherein the field of regard of the optical system in the elevation direction is greater than approximately 165 deg. 15. The system of claim 1, wherein a rotation of the second optical sub-system around the first axis provides a travel of the field of regard in an azimuth direction. 16. The system of claim 15, wherein the field of regard of the sensor system in the azimuth direction is greater than approximately 140 deg. 17. The system of claim 1, wherein the field of regard of the sensor system in a pitch direction is greater than approximately 75 deg. 18. The system of claim 1, wherein the first mirror is further configured to rotate around a third axis substantially perpendicular to the second axis and in a plane of the mirror, wherein a rotation of the first mirror around the third axis prevents a gimbal singularity in which a line of sight direction substantially coincides with the first axis. 19. The system of claim 1, further comprises a control system configured to control an orientation of the first mirror to capture radiation from a far field object or scene. 20. The system of claim 19, wherein the control system is configured to control a tracking of the object or scene by rotating the first mirror about a third axis substantially perpendicular to the second axis when the object or scene is located around a gimbal singularity in which a line of sight direction of the object or scene is within a range of angles that surround the first axis, and not rotating the second optical sub-system about the first axis. 21. The system of claim 20, wherein the range of angles is between approximately −3 deg. and approximately +3 deg. relative to the first axis. 22. A sensor system comprising: a first optical sub-system comprising a first plurality of optical elements; anda second optical sub-system comprising a second plurality of optical elements including a first mirror and an afocal fore-optics configured to receive radiation from the first mirror and to transmit the radiation towards the first optical sub-system, the second optical sub-system configured to rotate about a first axis relative to the first optical sub-system and the first mirror configured to rotate about a second axis substantially perpendicular to the first axis;wherein the first axis and the second axis are arranged so as not to intersect each other so as to maximize a field of regard of the sensor system; andwherein the afocal fore-optics comprises two or more anastigmat mirrors. 23. The system of claim 22, wherein the first axis is substantially parallel to a radiation beam output by the afocal fore-optics. 24. The system of claim 22, wherein the second plurality of optical elements comprises a bypass mirror and a wide field-of-view insert mirror configured and arranged to be movable so that radiation from the first mirror bypasses the afocal fore-optics. 25. The system of claim 24, wherein when radiation passes through the afocal fore-optics a relatively narrow field of view is achieved and when the afocal fore-optics is bypassed using the bypass mirror and wide field of view insert mirror a wider field of view is achieved. 26. A sensor system comprising: a first optical sub-system comprising a first plurality of optical elements; anda second optical sub-system comprising a second plurality of optical elements including a first mirror, the second optical sub-system configured to rotate about a first axis relative to the first optical sub-system and the first mirror configured to rotate about a second axis substantially perpendicular to the first axis;wherein the first axis and the second axis are arranged so as not to intersect each other so as to maximize a field of regard of the sensor system; andwherein the first plurality of optical elements comprises an optical imager and a detector, the optical imager being configured to receive radiation from the second optical sub-system and to relay the radiation to the detector. 27. The system of claim 26, wherein the first plurality of optical elements comprises a derotation device configured to receive radiation from the second optical system and to transmit the radiation towards the optical imager, the derotation device being configured to counter-rotate a beam of radiation so that an image output by the derotation device is in a same direction independent of a rotation of the first mirror. 28. The system of claim 26, wherein the first optical sub-system further comprises a laser module configured to emit a laser beam and an auto-alignment beam, the laser beam being directed towards the first mirror. 29. The system of claim 28, wherein the first optical sub-system further includes a laser dichroic mirror and a beam direction device, the laser dichroic mirror being configured and arranged to reflect the laser beam and transmit at least a portion of the auto-alignment beam when the alignment beam is incident on a first face of the laser dichroic mirror and to reflect at least a portion of the auto-alignment beam when the alignment beam is incident on a second face opposite the first face, wherein the beam direction device is configured to direct at least a portion of the auto-alignment beam towards the second face of the laser dichroic mirror. 30. The system of claim 29, wherein the second face of the laser dichroic mirror is configured to reflect at least a portion of the auto-alignment beam towards the optical imager and the optical imager is configured to transmit at least a portion of the auto-alignment beam towards an auto-alignment detector. 31. The system of claim 30, wherein the auto-alignment beam is used to determine a line of sight of the laser beam. 32. The system of claim 30, wherein the laser dichroic mirror and the beam direction device are configured so that the auto-alignment beam follows a path of the laser beam. 33. The system of claim 26, wherein the first plurality of optical elements further comprises a first beam steering mirror, wherein the beam steering mirror is configured to be rotated so as to cancel a scanning motion of a line of sight of an object or scene by a continuous rotation of the first mirror during a time period corresponding to an exposure time on the detector. 34. The system of claim 33, wherein the detector is a linear one-dimensional focal plane array. 35. The system of claim 33, wherein the detector is a two-dimensional focal plane array. 36. The system of claim 33, wherein the first plurality of optical elements further comprises a second beam steering mirror and the second plurality of optical elements further comprises an afocal fore-optics, wherein the first beam steering mirror and the second beam steering mirror are configured to substantially eliminate beam walk within a primary mirror of the afocal fore-optics.
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