CN102879891B - Optical system with large relative aperture, wide spectrum and large field of view - Google Patents
Optical system with large relative aperture, wide spectrum and large field of view Download PDFInfo
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- CN102879891B CN102879891B CN201210374318.7A CN201210374318A CN102879891B CN 102879891 B CN102879891 B CN 102879891B CN 201210374318 A CN201210374318 A CN 201210374318A CN 102879891 B CN102879891 B CN 102879891B
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- catoptron
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- relative aperture
- wide spectrum
- visual field
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Abstract
The invention relates to an optical system with a large relative aperture, a wide spectrum and a large field of view. The optical system comprises a first reflector, a second reflector, a third reflector, a fourth reflector and an image surface which are sequentially arranged on the same optical path. The reflecting optical system is wide in application range, large in relative aperture, wide in spectrum and large in field of view, the imaging quality of the optical system is close to refractory limit, the integral system has the advantages of light and small structure, easiness in processing and detection and the like, and can be applied to space non-operative target detecting cameras.
Description
Technical field
The present invention relates to field of photoelectric technology, relate to the wide spectrum of a kind of object lens of large relative aperture compared with large visual field optical system, relate in particular to a kind of wide spectrum of object lens of large relative aperture for space flight noncooperative target detection system of applicable space environment compared with large visual field optical system.
Background technology
The spatial resolution of Space Optical System is relevant with optical system relative aperture, resolution characteristic is relevant with optical system imaging spectral range, modern space flight optical system is more and more higher to the requirement of optical system relative aperture and imaging spectral scope, wish that relative aperture is large as far as possible, imaging spectral scope is wide as far as possible, wish to obtain larger visual field, to survey wider target simultaneously.For the wide spectrum of object lens of large relative aperture, compared with large visual field optical system, for transmittance structure form, because variable is many, transmittance structure form is than the requirement that is easier to realize object lens of large relative aperture, wide spectrum, large visual field, high picture element.
But in the application of space, owing to being subject to the characteristic limitations of the aspects such as transmissive glass Refractive Index of Material stability, material homogeneity, physical characteristics of materials, in optical system, optical material refractive index absolute value changes in a vacuum, can cause that optical system light path changes, affect system imaging performance
In addition, Space Optical System is also very high for the requirement of environment temperature and air pressure change, for the optical system of spatial transmission version, is difficult for realizing these specific (special) requirements.In the optical system of reflecting system version, optical element is all reflecting surface, not affected by the chromatic aberation of material, it can imaging spectral wide ranges, from spectral region such as ultraviolet, visible ray, infrared, near infrareds, all can use, do not have aberration, reflective optical devices reflectivity is higher than the transmissivity of lens.Consider that optical system veiling glare suppresses that ability, light are blocked, image quality and the overall aspects such as requirement.
Proposed a kind of compact conformation, the wide spectrum of object lens of large relative aperture that image quality is good herein compared with large visual field optical system, can be applicable to aerospace noncooperative target and survey in camera.
Summary of the invention
The present invention for solve the wide spectrum of existing object lens of large relative aperture compared with large visual field optical system prepare that veiling glare veiling glare suppresses that ability, machine system are heavy, processing detection difficult, problem that resetting difficulty is large, proposed a kind of compact conformation, veiling glare and suppressed that ability is strong, light blocks the larger visual field of the wide spectrum of object lens of large relative aperture little, good imaging quality reflective optical system, comprise three catoptrons with curvature and a plane mirror, wherein the catoptron with curvature is quadric surface, processing detects easily, and engineering realizability is strong.
Concrete technical solution of the present invention is as follows:
The wide spectrum of this object lens of large relative aperture is compared with large visual field optical system, along reflector position, comprise successively from left to right the second catoptron, the first catoptron, the 4th catoptron and the 3rd catoptron, along its optical axis direction, be followed successively by the first catoptron, the second catoptron, the 3rd catoptron, the 4th catoptron, described the first catoptron, the 3rd catoptron and the 4th catoptron center are provided with the through hole passing through for reflected light; The diameter of described the first mirror via is less than the external diameter of the second catoptron, and the through hole of the 4th catoptron is less than or equal to the through hole of the first catoptron, and the through hole of the 3rd catoptron is less than or equal to the through hole of the 4th catoptron.
Above-mentioned the first catoptron, the second catoptron and the 4th catoptron are the catoptron with curvature.
Above-mentioned the 3rd catoptron is plane mirror.
That above-mentioned the first catoptron, the second catoptron, the 3rd catoptron, the 4th power of mirror are followed successively by is negative, negative, zero, just.
The aspheric surface type of above-mentioned the first catoptron, the second catoptron and the 4th catoptron is quadric surface, for the first catoptron: 1.6f < R
1< 2.2f, for the second catoptron: 0.12f < R
2< 0.86f, for the 4th catoptron :-0.82f < R
4<-0.49f, the focal length that wherein f is optical system, R
1, R
2, R
4it is the radius-of-curvature of the first catoptron, the second catoptron, the 4th catoptron.
Between above-mentioned the first catoptron and the 4th catoptron, be provided with image planes one time.
Above-mentioned the first catoptron and the 4th catoptron are integral pieces.
Above-mentioned the first catoptron, the second catoptron, the 3rd catoptron, the 4th catoptron are titanium alloy catoptron.
Advantage of the present invention is:
1, the optical element of the optical system in the present invention is all catoptron, there is no aberration, and image quality is insensitive to variation of ambient temperature.
2, the imaging spectral wide ranges of the optical system in the present invention, is 400～1100nm, can obtain wider spectral characteristic.
3, the optical system in the present invention have image planes one time, it is strong that veiling glare suppresses ability.
4, the relative aperture of the optical system in the present invention is larger, is 1/2.5.
5, the field angle of the optical system in the present invention is larger, is 2.5 °.
6, the catoptron of the optical system in the present invention all uses titanium alloy, and machine system is light.
7, the compact conformation of the optical system in the present invention, is conducive to the Miniaturization Design of machine system.
8, the wide spectrum of the object lens of large relative aperture in the present invention is good compared with the image quality of large visual field optical system, and image quality approaches diffraction limit.
Accompanying drawing explanation
Fig. 1 is optical system structure schematic diagram provided by the present invention;
Fig. 2 is modulation transfer function of optical system provided by the present invention (MTF) schematic diagram.
Accompanying drawing is detailed as follows: 1-the first catoptron; 2-the second catoptron; 3-the 3rd catoptron; 4-the 4th catoptron; 5-image planes.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Referring to Fig. 1, the invention provides the wide spectrum of a kind of object lens of large relative aperture compared with large visual field optical system, this optical system comprises the first catoptron, the second catoptron, the 3rd catoptron, the 4th catoptron and image planes successively along optical path direction, along reflector position, comprises successively from left to right the second catoptron, the first catoptron, the 4th catoptron, the 3rd catoptron and image planes.
In order to reduce the catoptron processing detection difficulty in this optical system, primary mirror in the present invention (the first catoptron) and secondary mirror (the second catoptron and the 4th catoptron) all adopt quadric surface face type, wherein primary mirror and secondary mirror are ellipsoid, and the 3rd catoptron is plane mirror; , according to real work situation, consider meanwhile, because the first catoptron is relative with the reflecting surface of the 4th catoptron, and adjacent, the part therefore the two can be processed as one.
In order to improve the veiling glare of this optical system, suppress energy, be provided with image planes in the present invention one time, image planes, between primary mirror and the 4th catoptron, are conducive to the installation of light-shielding structure equipment.
In order to improve the detection performance of this optical system, in the present invention, use TDI-CCD imageing sensor, pixel dimension is 10 μ m * 10 μ m.In order to reduce the machine system size of this optical system, in the present invention rationally balance the optical power profile of each optical element.This invention can be applicable to the wide spectrum of object lens of large relative aperture in space environment space flight noncooperative target detection system compared with large visual field optical system.
The present invention, when specific works, can be configured the first negative refraction mirror, the second positive refraction mirror and the 4th negative refraction mirror with reference to following parameter, and it is effective can be better.For the first catoptron: 1.6f < R
1< 2.2f, for the second catoptron: 0.12f < R
2< 0.86f, for the 4th catoptron :-0.82f < R
4<-0.49f, the focal length that wherein f is optical system, R
1, R
2, R
4it is the radius-of-curvature of the first catoptron, the second catoptron, the 4th catoptron.
To the wide spectrum of dark a kind of object lens of large relative aperture in the present embodiment, compared with large visual field optical system, adopt modulation transfer function (MTF) evaluation means to test and assess.Table 1 has provided the biography letter of each visual field meridian direction of spatial frequency 50lp/mm place and the concrete biography letter value of sagitta of arc direction, and the numerical value of known both direction all approaches diffraction limit, and system imaging is good.
The modulation transfer function numerical value of table each visual field of 150lp/mm
| Visual field | Meridian passes letter | The sagitta of arc passes letter |
| 0 | 0.802 | 0.800 |
| 0.3ω | 0.775 | 0.791 |
| 0.5ω | 0.743 | 0.820 |
| 0.7ω | 0.757 | 0.830 |
| ω | 0.783 | 0.805 |
Referring to Fig. 1, the wide spectrum of object lens of large relative aperture in space flight noncooperative target detection system is compared with large visual field optical system, and it uses wavelength coverage is 500～14000nm, optical system overall length is 179mm, the first catoptron and the 4th mirror separation 12mm, back work distance is 30mm, optical system is without vignetting.
The aberration correction of optical system provided by the invention is very good, image quality is very high, reached the object of design, the wide spectrum of this object lens of large relative aperture is compared with large visual field optical system, by change four catoptrons and parameter, also be suitable in the system of different spectral coverages, can in rugged environment, use simultaneously.
Claims (4)
1. the wide spectrum of object lens of large relative aperture is compared with large visual field optical system, it is characterized in that: comprise successively the second catoptron, the first catoptron, the 4th catoptron and the 3rd catoptron, along light going direction, be followed successively by the first catoptron, the second catoptron, the 3rd catoptron, the 4th catoptron, described the first catoptron, the 3rd catoptron and the 4th catoptron center are provided with the through hole passing through for reflected light; The diameter of described the first mirror via is less than the external diameter of the second catoptron, and the through hole of the 4th catoptron is less than or equal to the through hole of the first catoptron, and the through hole of the 3rd catoptron is less than or equal to the through hole of the 4th catoptron; Described the 3rd catoptron is plane mirror; That described the first catoptron, the second catoptron, the 3rd catoptron, the 4th power of mirror are followed successively by is negative, negative, zero, just; The aspheric surface type of described the first catoptron, the second catoptron and the 4th catoptron is quadric surface, for the first catoptron: 1.6f < R
1< 2.2f, for the second catoptron: 0.12f < R
2< 0.86f, for the 4th catoptron :-0.82f < R
4<-0.49f, the focal length that wherein f is optical system, R
1, R
2, R
4it is the radius-of-curvature of the first catoptron, the second catoptron, the 4th catoptron.
2. the wide spectrum of object lens of large relative aperture according to claim 1, compared with large visual field optical system, is characterized in that: between described the first catoptron and the 4th catoptron, be provided with image planes one time.
3. the wide spectrum of object lens of large relative aperture according to claim 2, compared with large visual field optical system, is characterized in that: described the first catoptron and the 4th catoptron are integral pieces.
4. the wide spectrum of object lens of large relative aperture according to claim 3, compared with large visual field optical system, is characterized in that: described the first catoptron, the second catoptron, the 3rd catoptron, the 4th catoptron are titanium alloy catoptron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210374318.7A CN102879891B (en) | 2012-09-27 | 2012-09-27 | Optical system with large relative aperture, wide spectrum and large field of view |
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|---|---|---|---|
| CN201210374318.7A CN102879891B (en) | 2012-09-27 | 2012-09-27 | Optical system with large relative aperture, wide spectrum and large field of view |
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| CN102879891A CN102879891A (en) | 2013-01-16 |
| CN102879891B true CN102879891B (en) | 2014-12-10 |
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| CN104090355A (en) * | 2014-07-02 | 2014-10-08 | 北京理工大学 | All-weather star sensor optical system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2833717B1 (en) * | 2001-12-14 | 2004-02-20 | Thales Sa | CASSEGRAIN-TYPE MULTI-FIELD OPTICAL COMBINATION |
| WO2008063825A1 (en) * | 2006-11-21 | 2008-05-29 | Intel Corporation | Reflective optical system for a photolithography scanner field projector |
| CN203054331U (en) * | 2012-09-27 | 2013-07-10 | 中国科学院西安光学精密机械研究所 | Large relative aperture and wide spectrum larger viewing field optic system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2833717B1 (en) * | 2001-12-14 | 2004-02-20 | Thales Sa | CASSEGRAIN-TYPE MULTI-FIELD OPTICAL COMBINATION |
| WO2008063825A1 (en) * | 2006-11-21 | 2008-05-29 | Intel Corporation | Reflective optical system for a photolithography scanner field projector |
| CN203054331U (en) * | 2012-09-27 | 2013-07-10 | 中国科学院西安光学精密机械研究所 | Large relative aperture and wide spectrum larger viewing field optic system |
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| CN102879891A (en) | 2013-01-16 |
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