CN102322959B - Large visual field scanning infrared optical system containing aspherical fairing - Google Patents
Large visual field scanning infrared optical system containing aspherical fairing Download PDFInfo
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- CN102322959B CN102322959B CN201110150431.2A CN201110150431A CN102322959B CN 102322959 B CN102322959 B CN 102322959B CN 201110150431 A CN201110150431 A CN 201110150431A CN 102322959 B CN102322959 B CN 102322959B
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- aspheric surface
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Abstract
The invention relates to a large visual scanning infrared optical system containing an aspherical fairing, belonging to the technical field of optical instruments. The system comprises a rotary symmetrical aspherical fairing, an achromatic rotary Risley prism pair, an optical imaging system and a detector image surface. The special aspherical fairing according with hydrokinetics is applied to the system and has favorable hydrodynamic performance; the detected target is subjected to dynamic scanning and imaging by using an optical wedge; an imaging optical system in a subsequent light path is fixed; and a low-temperature coil and electronic equipment do not pass through a rotating mechanical device. The large visual scanning infrared optical system meets the characteristics of medium dynamics, has the advantages of favorable quality of system imaging, light weight, shortness in length and simple structure, can reach a scanning visual field with more than 60 degrees and can be widely applied to the fields of investigation, rescue and the like.
Description
Technical field
Ben Fanming belongs to optical instrument technical field, relates to a kind of large field of view scan infrared optical system containing aspheric surface radome fairing, and visual field infrared focal plane imaging is specially adapted to expose thoroughly.
Background technology
The effect of infrared imagery technique in modern times investigation, rescue becomes increasingly conspicuous.As image-forming component, when the optical rectification of thruster target seeker covers on and meets optical detection system picture element and require, also need to meet the requirement of fluid dynamics lower resistance.The outside surface of Rotational Symmetry aspherics radome fairing has sharper arcuation profile, more can meet the requirement of medium dynamic performance.But, when the optical system after radome fairing is carried out spotting scaming imaging to the visual field of certain limit, owing to participating in the rectification cover type of imaging, be aspheric, introduce various aberrations to follow-up optical system, have a strong impact on image quality.
The prior art the most approaching with the present invention is patent CN.200910236443.X, and this optical system only has 5 ° of-10 ° of visual fields, and all adopts refracting element, and system length is large, complex structure, is difficult to meet the narrow and small service condition in thruster inner space.
In order to overcome above-mentioned shortcoming, a kind of large field of view scan infrared optical system containing aspheric surface radome fairing of ad hoc meter, can be suitable for scanning field of view (being greater than 60 °) in a big way, system architecture is simple, length is short, and is to obtain modulation transfer function (MTF) value that approaches diffraction limit at 2.0 o'clock at f-number F.
Summary of the invention
The object of the invention is to solve under aspheric surface radome fairing condition, the less and baroque problem in system visual field, proposes a kind of large field of view scan infrared optical system containing aspheric surface radome fairing.
The object of the invention is to be achieved through the following technical solutions.
A kind of large field of view scan infrared optical system containing aspheric surface radome fairing of the present invention comprises: Rotational Symmetry aspheric surface radome fairing (1), aspheric surface correction plate (2), spherical optical lens (3), achromatism rotation Risley prism is to (4), spherical optical lens group (5), non-spherical reflector (6), spherical reflector (7), spherical optical lens group (8), spherical optical lens (9) and detector image planes (10); On the direction of propagation of light, above each optical element is arranged in co-axial alignment in order successively.
Wherein, Rotational Symmetry aspheric surface radome fairing (1) is the aspheric surface that has rotation axes of symmetry, aspheric surface correction plate (2) is for aberration correction, achromatism rotation Risley prism can carry out visual field scanning and achromatism on a large scale to (4), non-spherical reflector (6), spherical reflector (7) for reflection ray to reduce system bulk; The spacing of Rotational Symmetry aspheric surface radome fairing (1) forward end apex along optical axis direction to detector image planes (10) is 3.5 times of system focal length.
Specific design method of the present invention is as follows:
1. adopt a kind of dynamic (dynamical) Rotational Symmetry aspheric surface of medium radome fairing (1) that meets, used aspheric surface correction plate (2) to carry out picture element compensation.When reducing resistance of medium, improving range of movement, make image quality approach diffraction limit, and the value of f-number F is less than 2.0;
2. for system can be imaged in detector image planes in the target of large tracking field of view, adopt achromatism rotation Risley prism, to (4), target is carried out to optical mechaical scanning.As shown in Figure 2, Risley prism is used in pairs, wedge in the plane vertical with optical axis around optical axis rotation, under the state not moving in follow-up imaging system, the obstructed over-rotation mechanical hook-up of cryogen and electronic equipment.To scanning within the scope of certain field of regard, simple in structure.System scan visual field can reach 60°， instantaneous field of view can reach 4 °.
3. in order to reduce system length, to meet the narrow and small service condition in thruster inner space, the present invention has used non-spherical reflector (6), (7) two catoptrons of spherical reflector to carry out catadioptric to light in subsequent optical imaging system, form folding, reflecting element mixed structure with refractor, this structure has effectively reduced the overall length of follow-up image-forming component, make system bulk compact, reach 100% cold stop efficiency, making the spacing of Rotational Symmetry aspheric surface radome fairing (1) forward end apex along optical axis direction to detector image planes (10) is 3.5 times of system focal length.
By above method for designing, a kind of large field of view scan infrared optical system containing aspheric surface radome fairing of the present invention can be suitable for being greater than the scanning field of view of 60 ° of scopes, system architecture is simple, length is short, and is to obtain modulation transfer function (MTF) value that approaches diffraction limit at 2.0 o'clock at f-number F.
Principle of work of the present invention: the infrared radiation of infinite distance target transmitting passes through Rotational Symmetry aspheric surface radome fairing (1) successively, aspheric surface correction plate (2), spherical optical lens (3), achromatism rotation Risley prism to (4), spherical optical lens group (5), non-spherical reflector (6), spherical reflector (7), spherical optical lens group (8), spherical optical lens (9) after, be irradiated to detector image planes (10) upper, obtain last picture.
Beneficial effect
The present invention contrasts prior art and has following remarkable advantage: the present invention has adopted and a kind ofly met the dynamic (dynamical) Rotational Symmetry aspheric surface of medium radome fairing, and uses a kind of aspheric surface correction plate to carry out picture element compensation.When reducing resistance of medium, improving range of movement, make image quality approach diffraction limit, and the value of f-number F is less than 2.0.Contain rotation ray machine Scan Architecture, under the condition of not moving in follow-up imaging system, carry out visual field scanning (being greater than 60 °) in a big way.System architecture is simple, volume compact, reaches 100% cold stop efficiency, and the spacing of Rotational Symmetry aspheric surface radome fairing (1) forward end apex along optical axis direction to detector image planes (10) is 3.5 times of system focal length.Be particularly suitable for being applied in the fields such as modern investigation, rescue as infrared seeker.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is that the Risley prism of different rotary angle moves towards schematic diagram to controlling light;
Fig. 3 is the structural representation of prior art;
In figure, 1-Rotational Symmetry aspheric surface radome fairing, 2-aspheric surface correction plate, 3-spherical optical lens, 4-achromatism rotation Risley prism pair, 5-spherical optical lens group, 6-non-spherical reflector, 7-spherical reflector, 8-spherical optical lens group, 9-spherical optical lens, 10-detector image planes, 11-radome fairing, the single positive spherical optical lens of 12-first, the single positive spherical optical lens of 13-second, the single negative spherical optical lens of 14-first, the single positive spherical optical lens group of 15-first, the single positive spherical optical lens of 16-the 3rd, the single positive spherical optical lens of 17-the 4th, the single negative spherical optical lens of 18-second, the single positive spherical optical lens group of 19-second, the single negative spherical optical lens of 20-the 3rd, 21-protects glass pane, 22-detector image planes.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 1, the present invention will be mainly used in the visual field infrared focal plane imaging that exposes thoroughly to embodiment.Can be widely used in the fields such as modern investigation, rescue.
As shown in Figure 1, a kind of large field of view scan infrared optical system containing aspheric surface radome fairing of the present invention, comprise Rotational Symmetry aspheric surface radome fairing (1), aspheric surface correction plate (2), spherical optical lens (3), achromatism rotation Risley prism is to (4), spherical optical lens group (5), non-spherical reflector (6), spherical reflector (7), spherical optical lens group (8), spherical optical lens (9) and detector image planes (10); On the direction of propagation of light, above each optical element is arranged in co-axial alignment in order successively.
In embodiment, the infrared radiation of infinite distance target transmitting is irradiated on detector element successively after above each optical element, obtains last picture.
In embodiment, Rotational Symmetry aspheric surface radome fairing (1) is the aspheric surface that has rotation axes of symmetry, aspheric surface correction plate (2) is for aberration correction, achromatism rotation Risley prism to (4) for can carry out visual field scanning and achromatism on a large scale, non-spherical reflector (6), spherical reflector (7) for reflection ray to reduce system bulk; The spacing of Rotational Symmetry aspheric surface radome fairing (1) forward end apex along optical axis direction to detector image planes (10) is 3.5 times of system focal length.
In embodiment, lens design parameter is as shown in table 1.
In embodiment, the aspheric surface radome fairing of employing meets principle of hydrodynamics, uses aspheric surface correction plate to carry out picture element compensation, adopts rotation ray machine Scan Architecture and folding, reflecting mixing type imaging arrangement, mainly has the following advantages:
1. when reducing resistance of medium, improving range of movement, make image quality approach diffraction limit, and the value of f-number F is less than 2.0.
2., under the state not moving in follow-up imaging system, simplied system structure, carries out visual field scanning (being greater than 60 °) in a big way.
3. system bulk is compact, reaches 100% cold stop efficiency, and it is 3.5 times of system focal length to the spacing of detector image planes (10) that Rotational Symmetry aspheric surface radome fairing (1) forward end apex is prolonged optical axis direction.
Table 1 (unit: mm)
Claims (2)
1. the large aperture large field of view scan infrared optical system containing aspheric surface radome fairing, it is characterized in that: comprise Rotational Symmetry aspheric surface radome fairing (1), aspheric surface correction plate (2), spherical optical lens (3), achromatism rotation Risley prism is to (4), spherical optical lens group (5), non-spherical reflector (6), spherical reflector (7), spherical optical lens group (8), spherical optical lens (9) and detector image planes (10); On the direction of propagation of light, above each optical element is arranged in co-axial alignment in order successively; The infrared radiation of infinite distance target transmitting is irradiated on detector element successively after each optical element, obtains last picture;
Rotational Symmetry aspheric surface radome fairing (1) is the aspheric surface that has rotation axes of symmetry, aspheric surface correction plate (2) is for aberration correction, achromatism rotation Risley prism to (4) for can carry out visual field scanning and achromatism on a large scale, non-spherical reflector (6), spherical reflector (7) for reflection ray to reduce system bulk; The spacing of Rotational Symmetry aspheric surface radome fairing (1) forward end apex along optical axis direction to detector image planes (10) is 3.5 times of system focal length.
2. a kind of large aperture large field of view scan infrared optical system containing aspheric surface radome fairing according to claim 1, is characterized in that the method for designing of this system is as follows:
1), adopt and meet the dynamic (dynamical) Rotational Symmetry aspheric surface of medium radome fairing (1), use aspheric surface correction plate (2) to carry out picture element compensation, when reducing resistance of medium, improving range of movement, make image quality approach diffraction limit, and the value of f-number F is less than 2.0;
2), for system can be imaged in detector image planes in the target of large tracking field of view, adopt achromatism rotation Risley prism, to (4), target is carried out to optical mechaical scanning; Risley prism is used in pairs, wedge in the plane vertical with optical axis around optical axis rotation, under the state not moving in follow-up imaging system, the obstructed over-rotation mechanical hook-up of cryogen and electronic equipment; To scanning within the scope of certain field of regard, simple in structure; System scan visual field can reach 60°， instantaneous field of view can reach 4 °;
3), in order to reduce system length, to meet the narrow and small service condition in thruster inner space, the present invention has used non-spherical reflector (6), (7) two catoptrons of spherical reflector to carry out catadioptric to light in subsequent optical imaging system, form folding, reflecting element mixed structure with refractor, this structure has effectively reduced follow-up image-forming component overall length, make system bulk compact, reach 100% cold stop efficiency, making the spacing of Rotational Symmetry aspheric surface radome fairing (1) forward end apex along optical axis direction to detector image planes (10) is 3.5 times of system focal length.
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| CN201110150431.2A CN102322959B (en) | 2011-06-07 | 2011-06-07 | Large visual field scanning infrared optical system containing aspherical fairing |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102269872B (en) * | 2011-09-07 | 2014-04-09 | 北京理工大学 | Double-view-field infrared optical system including aspheric surface fairing |
| CN102928967B (en) * | 2012-11-20 | 2015-12-23 | 无锡成电科大科技发展有限公司 | There is the imaging system of aberration correction shield |
| CN103760670A (en) * | 2014-01-17 | 2014-04-30 | 北京理工大学 | Large view field scanning infrared optical system comprising reflective spatial light modulator |
| CN103926001B (en) * | 2014-03-10 | 2015-09-30 | 北京理工大学 | A kind of high speed multispectral infinity dynamic object method for generation and device |
| CN106324832B (en) * | 2016-08-22 | 2019-07-19 | 哈尔滨工业大学 | A method of based on wavefront coded passivation Conformal Optical System aberration |
| CN107741635A (en) * | 2017-11-17 | 2018-02-27 | 北京长峰科威光电技术有限公司 | A kind of space optical axis offset system of refrigeration mode infrared thermal imaging camera lens |
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| US6384968B1 (en) * | 1999-05-31 | 2002-05-07 | Asahi Kogaku Kabushiki Kaisha | Microscope with illuminating optical system |
| EP1209508A2 (en) * | 1993-12-01 | 2002-05-29 | Sharp Kabushiki Kaisha | Display for 3D images |
| US7198376B2 (en) * | 2001-06-21 | 2007-04-03 | Sony Corporation | Illumination optical unit liquid crystal projector and production method of liquid crystal projector |
| CN101359098A (en) * | 2008-09-09 | 2009-02-04 | 东南大学 | Imaging device of coherent light |
| CN101692138A (en) * | 2009-10-21 | 2010-04-07 | 北京理工大学 | Refrigeration type infrared seeker optical system comprising aspheric special fairing |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1209508A2 (en) * | 1993-12-01 | 2002-05-29 | Sharp Kabushiki Kaisha | Display for 3D images |
| US6384968B1 (en) * | 1999-05-31 | 2002-05-07 | Asahi Kogaku Kabushiki Kaisha | Microscope with illuminating optical system |
| US7198376B2 (en) * | 2001-06-21 | 2007-04-03 | Sony Corporation | Illumination optical unit liquid crystal projector and production method of liquid crystal projector |
| CN101359098A (en) * | 2008-09-09 | 2009-02-04 | 东南大学 | Imaging device of coherent light |
| CN101692138A (en) * | 2009-10-21 | 2010-04-07 | 北京理工大学 | Refrigeration type infrared seeker optical system comprising aspheric special fairing |
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