CN104865686A - Off-axis three-mirror optical system based on main three-mirror integrated wide spectrum - Google Patents
Off-axis three-mirror optical system based on main three-mirror integrated wide spectrum Download PDFInfo
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- CN104865686A CN104865686A CN201510264783.9A CN201510264783A CN104865686A CN 104865686 A CN104865686 A CN 104865686A CN 201510264783 A CN201510264783 A CN 201510264783A CN 104865686 A CN104865686 A CN 104865686A
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- optical system
- axle
- main
- mirror
- reflector
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0626—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using three curved mirrors
- G02B17/0642—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using three curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses an off-axis three-mirror optical system based on a main three-mirror integrated wide spectrum. The off-axis three-mirror optical system is formed by a main reflector, a secondary reflector, a third reflector and an aperture diaphragm. The secondary reflector is located on a reflected light path of the main reflector. The third reflector is located on a reflected light path of the secondary reflector. The position of the aperture diaphragm is superposed with the position of the secondary reflector. Light in a target area is successively reflected by the main reflector, the secondary reflector and the third reflector and then is imaged on an image plane. The reflectors adopted in the invention are quadric surfaces. Manufacturing and detection technologies of the reflectors are mature. Optical system imaging quality is guaranteed and simultaneously manufacturing cost of the whole system can be reduced. The main reflector and the third reflector adopted in the invention are designed integrally so that adjustment difficulty of the optical system is greatly reduced and great importance is generated for lightweighting of an optical-mechanical system.
Description
Technical field
The invention belongs to optical technical field, relate to a kind of from axle three reflecting optical system.
Background technology
Along with the development of earth observation from space technology, off-axis incidence astigmation free optical system just progressively replaces traditional coaxial optical system remote sensing camera, is widely used in Aeronautics and Astronautics field.The visible-light detector SBV etc. that hyperspectral imager on the investigation camera of U.S. Quick Bird Seeds of First Post-flight, India mapping camera CARTOSAT-1, Germany environment satellite EnMAP, USA space targeted surveillance satellite MSX carry all have employed from the anti-system of axle three.
From axle three reflecting optical system except the feature with reflective optical system, also have can realize Large visual angle, advantage that non-stop layer blocks, but its resetting difficulty is large, cost is high, and mechanical-optical setup part volume mass is large.If set about from basic theories, reduce optical system alignment difficulty by the method for optical design, realize from the lightweight of axle three anti-system mechanical-optical setup, by the great significance for design to space optical remote sensor.
Summary of the invention
In order to overcome the deficiencies in the prior art, reduce from the resetting difficulty of axle three reflecting optical system and the face type difficulty of processing of catoptron, the invention provides a kind of based on main three mirrors integration wide spectral from axle three reflecting optical system, the advantage of Large visual angle wide spectral should be had from axle three reflecting optical system.
The object of the invention is to be achieved through the following technical solutions:
A kind of based on main three mirrors integration wide spectral from axle three reflecting optical system, comprise principal reflection mirror, secondary mirror, the 3rd catoptron and aperture diaphragm, described secondary mirror is positioned on the reflected light path of principal reflection mirror, 3rd catoptron is positioned on the reflected light path of secondary mirror, principal reflection mirror and the 3rd mirror integral change into type, the position of aperture diaphragm overlaps with the position of secondary mirror, and the light in target area images in image planes place successively after the reflection of principal reflection mirror, secondary mirror and the 3rd catoptron.
In the present invention, described principal reflection mirror and three catoptrons are hyperboloid, and radius-of-curvature is identical with aspheric surface quadratic term coefficient, but respectively containing different aspheric surface high-order term coefficients; Secondary mirror is hyperboloid, not containing high-order term coefficient.
Tool of the present invention has the following advantages:
1, catoptron used in the present invention is quadric surface, the manufacture of the catoptron of this type and detection technique maturation, is also conducive to the manufacturing cost reducing whole system while ensureing optical system imaging quality.
2, the present invention adopt principal reflection mirror and the 3rd catoptron be the integrated design, greatly reduce the resetting difficulty of optical system, also significant to the lightweight of optical-mechanical system.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram from axle three reflecting optical system based on main three mirror integration wide spectral of the present invention;
The structural representation based on main three mirror integrations that Fig. 2 provides for the specific embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited thereto; everyly technical solution of the present invention modified or equivalent to replace, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.
The present invention devises a focal length 1200mm, relative aperture D/f '=1/12, field angle (rectangular field): 10 ° × 1 °, service band: 0.55 μm-15 μm from axle three reflecting optical system.
As shown in Figure 1, this optical system comprises principal reflection mirror 1, secondary mirror 2, the 3rd catoptron 3 and aperture diaphragm 4, secondary mirror 2 is positioned on the reflected light path of principal reflection mirror 1,3rd catoptron 3 is positioned on the reflected light path of secondary mirror 2, aperture diaphragm 4 overlaps with the position of secondary mirror 2, principal reflection mirror 1 and the 3rd catoptron 3 integrated molding.
The structural parameters of this optical system are as shown in table 1.
Table 1
| Radius-of-curvature/millimeter | Interval/millimeter | Aspheric surface quadratic term coefficient | Aspheric surface high-order term exponent number | From axle amount/millimeter | |
| Principal reflection mirror | -1265.044 | -278.039 | -10.809 | 10 rank | 70 |
| Secondary mirror | -669.173 | 278.039 | -4.470 | - | 10 |
| 3rd catoptron | -1265.044 | -970.525 | -10.809 | 10 rank | -39 |
Principal reflection mirror 1 and the 3rd catoptron 3 are hyperboloid, and radius-of-curvature is identical with aspheric surface quadratic term coefficient, but respectively containing different aspheric surface high-order term coefficients; Secondary mirror 3 is also hyperboloid, but not containing high-order term coefficient.
In actual manufacture, the milling on one piece of substrate of principal reflection mirror 1 and the 3rd catoptron 3 goes out same sphere, then according to aspheric design result, in the high order aspheric surface face type that the zones of different milling of sphere is different, form main three and be total to mirror, realize principal reflection mirror 1 and the 3rd catoptron 3 integrated design of optical system, as shown in Figure 2, both have identical radius-of-curvature.
Claims (8)
1. one kind based on main three mirrors integration wide spectral from axle three reflecting optical system, it is characterized in that describedly being made up of from axle three reflecting optical system principal reflection mirror, secondary mirror, the 3rd catoptron and aperture diaphragm, described secondary mirror is positioned on the reflected light path of principal reflection mirror, 3rd catoptron is positioned on the reflected light path of secondary mirror, the position of aperture diaphragm overlaps with the position of secondary mirror, and the light in target area images in image planes place successively after the reflection of principal reflection mirror, secondary mirror and the 3rd catoptron.
2. according to claim 1 based on main three mirrors integration wide spectral from axle three reflecting optical system, it is characterized in that described principal reflection mirror and the 3rd mirror integral change into type.
3. according to claim 1 and 2 based on main three mirrors integration wide spectral from axle three reflecting optical system, it is characterized in that described principal reflection mirror and the 3rd catoptron are hyperboloid, radius-of-curvature is identical with aspheric surface quadratic term coefficient, but respectively containing different aspheric surface high-order term coefficients.
4. according to claim 3 based on main three mirrors integration wide spectral from axle three reflecting optical system, it is characterized in that the radius-of-curvature of described principal reflection mirror :-1265.044mm, interval :-278.039mm, aspheric surface quadratic term coefficient :-10.809, aspheric surface high-order term exponent number: 10 rank, from axle amount: 70mm.
5. according to claim 3 based on main three mirrors integration wide spectral from axle three reflecting optical system, it is characterized in that the radius-of-curvature of described 3rd catoptron :-1265.044mm, interval :-970.525mm, aspheric surface quadratic term coefficient :-10.809, aspheric surface high-order term: 10 rank, from axle amount :-39mm.
6. according to claim 1 based on main three mirrors integration wide spectral from axle three reflecting optical system, it is characterized in that described secondary mirror is hyperboloid, not containing high-order term coefficient.
7. according to claim 6 based on main three mirrors integration wide spectral from axle three reflecting optical system, it is characterized in that the radius-of-curvature of described secondary mirror :-669.173mm, interval: 278.039mm, aspheric surface quadratic term coefficient :-4.470, from axle amount: 10mm.
8. according to claim 1 based on main three mirrors integration wide spectral from axle three reflecting optical system, it is characterized in that the described focal length 1200mm from axle three reflecting optical system, relative aperture D/f '=1/12, field angle: 10 ° × 1 °, service band: 0.55 μm-15 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510264783.9A CN104865686A (en) | 2015-05-22 | 2015-05-22 | Off-axis three-mirror optical system based on main three-mirror integrated wide spectrum |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510264783.9A CN104865686A (en) | 2015-05-22 | 2015-05-22 | Off-axis three-mirror optical system based on main three-mirror integrated wide spectrum |
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| Publication Number | Publication Date |
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| CN104865686A true CN104865686A (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510264783.9A Pending CN104865686A (en) | 2015-05-22 | 2015-05-22 | Off-axis three-mirror optical system based on main three-mirror integrated wide spectrum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290845A (en) * | 2016-04-01 | 2017-10-24 | 清华大学 | Off-axis three reflecting optical system of free form surface |
| CN112068295A (en) * | 2020-08-12 | 2020-12-11 | 中国科学院西安光学精密机械研究所 | Off-axis reflection type internal focusing optical system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05241080A (en) * | 1991-09-30 | 1993-09-21 | Hughes Aircraft Co | Double visual field reflection type picture reforming telescope |
| CN1350190A (en) * | 2001-11-07 | 2002-05-22 | 中国科学院上海技术物理研究所 | Astigmatism-eliminating three-reflector optical system |
| US20120200914A1 (en) * | 2010-06-01 | 2012-08-09 | Horton Richard F | Two mirror unobscured telescopes with tilted focal surfaces |
| CN103809277A (en) * | 2012-11-06 | 2014-05-21 | 清华大学 | Off-axis triple-reflector |
| US9372115B2 (en) * | 2014-08-05 | 2016-06-21 | Bae Systems Information And Electronic Systems Integration Inc. | Airborne hyperspectral scanning system with reflective telecentric relay |
-
2015
- 2015-05-22 CN CN201510264783.9A patent/CN104865686A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05241080A (en) * | 1991-09-30 | 1993-09-21 | Hughes Aircraft Co | Double visual field reflection type picture reforming telescope |
| CN1350190A (en) * | 2001-11-07 | 2002-05-22 | 中国科学院上海技术物理研究所 | Astigmatism-eliminating three-reflector optical system |
| US20120200914A1 (en) * | 2010-06-01 | 2012-08-09 | Horton Richard F | Two mirror unobscured telescopes with tilted focal surfaces |
| CN103809277A (en) * | 2012-11-06 | 2014-05-21 | 清华大学 | Off-axis triple-reflector |
| US9372115B2 (en) * | 2014-08-05 | 2016-06-21 | Bae Systems Information And Electronic Systems Integration Inc. | Airborne hyperspectral scanning system with reflective telecentric relay |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290845A (en) * | 2016-04-01 | 2017-10-24 | 清华大学 | Off-axis three reflecting optical system of free form surface |
| CN107290845B (en) * | 2016-04-01 | 2019-08-13 | 清华大学 | Off-axis three reflecting optical system of free form surface |
| CN112068295A (en) * | 2020-08-12 | 2020-12-11 | 中国科学院西安光学精密机械研究所 | Off-axis reflection type internal focusing optical system |
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Application publication date: 20150826 |
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