IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0887666
(2004-07-09)
|
우선권정보 |
FR-02 01534(2002-02-07) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
13 |
초록
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The invention concerns an optical instrument, designed to be used on a satellite, for simultaneously or quasi-simultaneously observing in two opposite angularly separated directions. It comprises at least two telescopes (TA, TB) having angularly spaced apart observation directions, each having a rea
The invention concerns an optical instrument, designed to be used on a satellite, for simultaneously or quasi-simultaneously observing in two opposite angularly separated directions. It comprises at least two telescopes (TA, TB) having angularly spaced apart observation directions, each having a real and accessible exit pupil and respective planar or superimposable image fields, with a width at least five times more than that of the pupil in a specific direction. Optical means provided at the exit pupil are arranged so as to form the image fields in a common overlapping focal plane except in lateral zones whereof the width is substantially equal to that of the exit pupil of the telescopes. In the common focal plane, an assembly of several matrix detectors are arranged and oriented on the superimposition zone of the image fields of the telescopes in the wavefront.
대표청구항
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The invention claimed is: 1. An optical instrument designed to be used on a satellite and allowing simultaneous or virtually simultaneous observations to be made in two angularly separated directions, comprising: at least two telescopes having angularly separated observation directions, each having
The invention claimed is: 1. An optical instrument designed to be used on a satellite and allowing simultaneous or virtually simultaneous observations to be made in two angularly separated directions, comprising: at least two telescopes having angularly separated observation directions, each having one pupil selected from the group consisting of an exit pupil and a real and accessible intermediate pupil, and an image field selected from the group consisting of respective exit image field and intermediate image field, with said image field being of width at least three times larger than that of said pupil in a given direction; an optical device placed at said pupil and disposed so as to superimpose the two telescope image fields in a focal plane common to both telescopes, with an overlapping area covering said image field except in lateral regions having a width which is substantially that of said telescope pupil; and in said common focal plane, an assembly of at least one matrix detector, disposed and oriented in the superimposed region of said image fields. 2. The instrument as claimed in claim 1, wherein said optical device includes two mirrors, situated in the neighbourhood of said pupils of said two telescopes and oriented in order to superimpose said two image fields. 3. The instrument as claimed in claim 1 or 2, comprising two sets of folding mirrors, respectively following said telescopes in order to bring together said pupils while still keeping them separate. 4. The instrument as claimed in claim 1 or 2 wherein an additional set of folding mirrors is disposed between said pupils and said common focal plane in order to facilitate a mechanical layout of the instrument. 5. The instrument as claimed in claim 1 or 2, wherein optical filters are disposed in at least one optical path of the telescopes. 6. The instrument as claimed in claim 1 or 2, wherein a shutter is placed in at least one optical path in order to deactivate at least one of two measurement channels. 7. The instrument as claimed in claim 1 or 2, wherein said at least one matrix detector is of the charge coupled device (CCD) type and is controlled to operate in time delay integration (TDI) mode which compensates for the continuous displacement of the scene observed by each telescope, both telescopes having the same focal length. 8. The instrument as claimed in claim 1 or 2, wherein said telescopes include mirrors, lenses or a combination of both, each optimized over an extended field, observing in two directions having an adjustable difference and designed such that said pupils can be brought near to one another for superimposing said image fields. 9. The instrument as claimed in claim 1, mounted on a satellite for observing point-like objects simultaneously and continuously through said two telescopes, comprising a real and accessible intermediate focal plane for at least a first of said two telescopes, additionally having a device allowing recognition of the telescope through which an object has been observed for each object detected in said common focal plane. 10. The instrument as claimed in claim 9, wherein said device comprises at least one additional matrix detector disposed in said intermediate focal plane of said first telescope and allowing the detection of all the objects crossing the common focal plane and observed through said first telescope. 11. The instrument as claimed in claim 1 or 2, mounted on a satellite for observing point-like objects simultaneously and continuously through said two telescopes, additionally having a device allowing recognition of the telescope through which an object has been observed for each object detected in said common focal plane. 12. The instrument as claimed in claim 11, wherein said device recognizes the telescope through which the object is observed by analyzing the trajectory of the object image in said common focal plane. 13. The instrument as claimed in claim 9, wherein said device comprises a field stop disposed in an intermediate focal plane of said first telescope so as to define a region in the common focal plane that is no more active for said first telescope, and at least one matrix detector located in said region in the common focal plane.
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