CN102262297A - Large-field scanning infrared optical system comprising reflective spatial light modulator - Google Patents
Large-field scanning infrared optical system comprising reflective spatial light modulator Download PDFInfo
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- CN102262297A CN102262297A CN2011101503004A CN201110150300A CN102262297A CN 102262297 A CN102262297 A CN 102262297A CN 2011101503004 A CN2011101503004 A CN 2011101503004A CN 201110150300 A CN201110150300 A CN 201110150300A CN 102262297 A CN102262297 A CN 102262297A
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Abstract
The invention relates to a large-field scanning infrared optical system comprising a reflective spatial light modulator and belongs to the technical field of optical instruments. The system comprises a rotational symmetric aspherical dome, an achromatic rotational Risley prism pair, the reflective spatial light modulator, an optical imaging system and a detector image surface. The system adopts a special aspherical dome which accords with fluid dynamics and has excellent fluid dynamic performance, performs dynamic phase compensation on the residual aberration of the system during scanning of different fields by adopting the reflective spatial light modulator and performs dynamic imaging on a detected target by using an optical wedge. The optical imaging system in a subsequent light path keeps fixed, and a low-temperature coil and electronic equipment do not pass through a rotational mechanical device. The system meets the dynamic characteristics of a medium, is good in imaging quality, light in weight, small in length and simple in structure, can scan the fields at positive/negative 60 DEG and can be widely applied to the fields of investigation, rescuing and the like.
Description
Technical field
The invention belongs to the optical instrument technical field, relate to a kind of big visual field scanning infrared optical system that contains reflective spatial light modulator, the visual field infrared focal plane imaging is specially adapted to expose thoroughly.
Background technology
Effect during infrared imagery technique was scouted, rescued in the modern times becomes increasingly conspicuous.The conformal radome fairing outside surface of rotation symmetry aspheric surface of target seeker has the arcuation profile of point, both can satisfy the picture element requirement of optical detection system, also can satisfy fluid dynamic lower resistance requirement.But, when the optical system of radome fairing back is carried out the spotting scaming imaging to the visual field of certain limit, be aspheric surface owing to participate in the rectification cover type of imaging, introduce various aberrations for follow-up optical system, have a strong impact on image quality.Because the residual aberration of system is different when the different scanning visual field, adopts the spatial light modulator can the aberration of corrective system when the different scanning visual field, thereby obtain the high-quality imaging in big visual field.
The prior art the most approaching with the present invention is patent CN.200910236443.X, and this optical system has only 5 ° of-10 ° of visual fields, and all adopts refracting element, and system length is big, complex structure, is difficult to satisfy the narrow and small service condition in thruster inner space.
In order to overcome above-mentioned shortcoming, a kind of big visual field scanning infrared optical system that contains the non-space photomodulator of ad hoc meter, can be suitable for scanning field of view (± 60 °) in a big way, system architecture is simple, length is short, the residual aberration of system is carried out phase compensation in the time of can utilizing reflective spatial light modulator to different visual field, thereby can both obtain modulation transfer function (MTF) value near diffraction limit at each scanning field of view.
Summary of the invention
The objective of the invention is to solve under the aspheric surface radome fairing condition, the less and baroque problem in system visual field proposes a kind of big visual field scanning infrared optical system that contains reflective spatial light modulator.
The objective of the invention is to be achieved through the following technical solutions.
A kind of big visual field scanning infrared optical system that contains reflective spatial light modulator of the present invention comprises: rotate symmetrical aspheric surface radome fairing (1); biquadratic curved surface adjustment plate (2); achromatism rotates Leix Lay prism to (3), Amici prism (4), reflective spatial light modulator (5), spherical optical lens group (6), spherical optical lens (7), spherical optical lens group (8), protection window (9), detector image planes (10).On the direction of propagation of light, element (1) is arranged successively in order to (6), and after the reflection of light through the Amici prism median surface of (6) reflected back, optical axis turns clockwise 90 °, and element (7) is arranged in order on postrotational optical axis to (9).
Wherein, rotating symmetrical aspheric surface radome fairing (1) is the aspheric surface that rotation axes of symmetry is arranged, biquadratic curved surface adjustment plate (2) is used for aberration correction, achromatism rotation Leix Lay prism can carry out visual field scanning and achromatism on a large scale to (3), Amici prism (4) can be turned back to light path and be placed the optical element of back with slot milling, and reflective spatial light modulator (5) is used for system is carried out the correction that phase compensation realizes aberration.
Specific design method of the present invention is as follows:
1. adopt a kind of symmetrical aspheric surface radome fairing of the dynamic (dynamical) rotation of medium (1) that meets, used biquadratic curved surface adjustment plate (2) to carry out the picture element compensation.When reducing resistance of medium, improving range of movement, make image quality near diffraction limit;
2. for system can be imaged on the detector image planes in the target of big tracking field of view, adopt achromatism rotation Risley prism that (4) are carried out optical mechaical scanning to target.As shown in Figure 2, Risley prism is used in pairs, wedge is to rotating around optical axis in the plane vertical with optical axis, and under the state that follow-up imaging system is not moved, cryogen and electronic equipment be not by the rotating machinery device.Set the goal to one and to scan in the field range, simple in structure.The system scan visual field can reach ± and 60 °.
For proofread and correct when different scanning visual field system residual different wave aberrations, adopt reflective spatial light modulator (5) that system is carried out dynamic phase compensation, the image quality of system can both reach diffraction limit when being implemented in each scanning field of view, thereby can increase scanning angle, reduce the complexity of system's initial configuration.
4. in order to reduce system length, to satisfy the placement space demand of optical element, in system, used Amici prism (4) that light path is turned back, this structure has reduced the length of system effectively, make the system bulk compactness, in the reflecting system of using reflective spatial light modulator (5), reserve enough placement spaces simultaneously for follow-up optical element.
By above method for designing, a kind of big visual field scanning infrared optical system that contains reflective spatial light modulator of the present invention can be suitable for ± scanning field of view of 60 ° of scopes, system architecture is simple, length is short, all can obtain modulation transfer function (MTF) value near diffraction limit at each different scanning field of view.
Principle of work of the present invention: the infrared radiation of infinite distance target emission is successively through rotation symmetrical aspheric surface radome fairing (1); biquadratic curved surface adjustment plate (2); achromatism rotation Leix Lay prism is to (3); Amici prism (4); reflective spatial light modulator (5); after reflective spatial light modulator (5) reflection, incide Amici prism (4) again; after the reflection of Amici prism (4), incide spherical optical lens group (6); pass through spherical optical lens (7) then successively; spherical optical lens group (8); behind the protection window (9); shine on the detector image planes (10), get picture to the end.
Beneficial effect
The present invention contrasts prior art and has following remarkable advantage: the present invention has adopted a kind of symmetrical aspheric surface radome fairing of fluid dynamic rotation that meets, and using a kind of biquadratic curved surface adjustment plate to carry out picture element compensation, the different residual aberration of the effect of phase compensation of utilizing reflective spatial light modulator simultaneously during to system different scanning visual field proofreaied and correct.When reducing resistance of medium, improving range of movement, utilize the dynamic phasing compensation of reflective spatial light modulator to make the image quality of each scanning field of view can both be near diffraction limit.Contain rotation optical mechaical scanning structure, under the condition that follow-up imaging system is not moved, carry out visual field scanning (± 60 °) in a big way.System architecture is simple, volume compact, image quality height, is particularly suitable for being applied in the fields such as modern investigation, rescue as infrared seeker.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is that the Risley prism of different rotary angle moves towards synoptic diagram to controlling light;
Fig. 3 is the structural representation of prior art;
Among the figure, 1-rotates symmetrical aspheric surface radome fairing; 2-biquadratic curved surface adjustment plate; 3-achromatism rotation Leix Lay prism is right; the 4-Amici prism; the 5-reflective spatial light modulator; 6-spherical optical lens group; the 7-spherical optical lens; 8-spherical optical lens group; 9-protects window; 10-detector image planes; the 11-radome fairing; 12-first single positive spherical optical lens; 13-second single positive spherical optical lens; 14-first single negative spherical optical lens; 15-first single positive spherical optical lens group; 16-the 3rd single positive spherical optical lens; 17-the 4th single positive spherical optical lens; 18-second single negative spherical optical lens; 19-second single positive spherical optical lens group; 20-the 3rd single negative spherical optical lens; 21-protects glass pane; 22-detector image planes.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Embodiment as shown in Figure 1, the present invention will be mainly used in the visual field infrared focal plane imaging that exposes thoroughly.Can be widely used in the fields such as modern investigation, rescue.
As shown in Figure 1, a kind of big visual field scanning infrared optical system that contains reflective spatial light modulator of the present invention, comprise rotation symmetrical aspheric surface radome fairing (1), biquadratic curved surface adjustment plate (2), achromatism rotates Leix Lay prism to (3), Amici prism (4), reflective spatial light modulator (5), spherical optical lens group (6), spherical optical lens (7), spherical optical lens group (8), protection window (9), detector image planes (10); On the direction of propagation of light, element (1) is arranged successively in order to (6), and after the reflection of light through the Amici prism median surface of (6) reflected back, optical axis turns clockwise 90 °, and element (7) is arranged in order on postrotational optical axis to (9).
Among the embodiment; the infrared radiation of infinite distance target emission is successively through rotation symmetrical aspheric surface radome fairing (1); biquadratic curved surface adjustment plate (2); achromatism rotation Leix Lay prism is to (3); Amici prism (4); reflective spatial light modulator (5); after reflective spatial light modulator (5) reflection, incide Amici prism (4) again; after the reflection of Amici prism (4), incide spherical optical lens group (6); pass through spherical optical lens (7) then successively; spherical optical lens group (8); behind the protection window (9); shine on the detector image planes (10), get picture to the end.
Among the embodiment, rotating symmetrical aspheric surface radome fairing (1) is the aspheric surface that rotation axes of symmetry is arranged, biquadratic curved surface adjustment plate (2) is used for aberration correction, achromatism rotation Leix Lay prism can carry out visual field scanning and achromatism on a large scale to (3), Amici prism (4) can be turned back to light path and be placed the optical element of back with slot milling, and reflective spatial light modulator (5) is used for system is carried out the correction that phase compensation realizes aberration.
The concrete parameter of lens is as shown in table 1 among the embodiment.
Among the embodiment, the aspheric surface radome fairing that adopts meets principle of hydrodynamics, use biquadratic curved surface adjustment plate to carry out the picture element compensation, adopt reflective spatial light modulator that the residual aberration of system is carried out dynamic compensation, adopt rotation optical mechaical scanning structure and folding, reflecting mixing type imaging arrangement, mainly contain following advantage:
1. when reducing resistance of medium, improving range of movement, utilize the dynamic phasing compensating action of reflective spatial light modulator to make the image quality of each scanning field of view all near diffraction limit.
2. under the state that follow-up imaging system is not moved, simplied system structure carries out visual field scanning (± 60 °) in a big way.
3. owing to the dynamic compensation effect of reflective spatial light modulator, can simplify the structure of starter system, reduce the scale and the complexity of system.
Table 1 (unit: mm)
Claims (3)
1. big visual field scanning infrared optical system in large aperture that contains reflective spatial light modulator, it is characterized in that: comprise rotation symmetrical aspheric surface radome fairing (1), biquadratic curved surface adjustment plate (2), achromatism rotates Leix Lay prism to (3), Amici prism (4), reflective spatial light modulator (5), spherical optical lens group (6), spherical optical lens (7), spherical optical lens group (8), protection window (9), detector image planes (10); On the direction of propagation of light, element (1) is arranged successively in order to (6), and after the reflection of light through the Amici prism median surface of (6) reflected back, optical axis turns clockwise 90 °, and element (7) is arranged in order on postrotational optical axis to (9).The infrared radiation of infinite distance target emission is successively through rotation symmetrical aspheric surface radome fairing (1); biquadratic curved surface adjustment plate (2); achromatism rotation Leix Lay prism is to (3), Amici prism (4), reflective spatial light modulator (5); after the reflective spatial light modulator reflection, incide Amici prism (4) again; after the reflection of Amici prism (4), incide spherical optical lens group (6); after passing through spherical optical lens (7), spherical optical lens group (8), protection window (9) then successively; shine on the detector image planes (10), get picture to the end.
2. a kind of big visual field scanning infrared optical system in large aperture that contains reflective spatial light modulator according to claim 1, it is characterized in that: rotating symmetrical aspheric surface radome fairing (1) is the aspheric surface that rotation axes of symmetry is arranged, biquadratic curved surface adjustment plate (2) is used for aberration correction, achromatism rotation Leix Lay prism can carry out visual field scanning and achromatism on a large scale to (3), Amici prism (4) can be turned back to light path and be placed the optical element of back with slot milling, and reflective spatial light modulator (5) is used for system is carried out the correction that phase compensation realizes aberration.
3. a kind of big visual field scanning infrared optical system in large aperture that contains reflective spatial light modulator according to claim 1 is characterized in that the method for designing of this system is as follows:
1), adopted a kind of symmetrical aspheric surface radome fairing of the dynamic (dynamical) rotation of medium (1) that meets, use biquadratic curved surface adjustment plate (2) to carry out the picture element compensation.When reducing resistance of medium, improving range of movement, make image quality near diffraction limit;
2), can be imaged on the detector image planes in the target of big tracking field of view, adopt achromatism rotation Leix Lay prism that (4) are carried out optical mechaical scanning to target in order to make system.As shown in Figure 2, Risley prism is used in pairs, wedge is to rotating around optical axis in the plane vertical with optical axis, and under the state that follow-up imaging system is not moved, cryogen and electronic equipment be not by the rotating machinery device.Set the goal to one and to scan in the field range, simple in structure.The system scan visual field can reach ± and 60 °.
3), for proofread and correct when different scanning visual field system residual different wave aberrations, adopt reflective spatial light modulator (5) that system is carried out dynamic phase compensation, the image quality of system can both reach diffraction limit when being implemented in each scanning field of view, thereby can increase scanning angle, reduce the complexity of system's initial configuration.
4), in order to reduce system length, to satisfy the placement space demand of optical element, in system, used Amici prism (4) that light path is turned back, this structure has reduced the length of system effectively, make the system bulk compactness, in the reflecting system of using reflection type liquid crystal spatial light modulator (4), reserve enough placement spaces simultaneously for follow-up optical element.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104102018A (en) * | 2014-05-08 | 2014-10-15 | 北京理工大学 | Double pit local high resolution imaging system |
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| US5193025A (en) * | 1992-01-21 | 1993-03-09 | Hughes Aircraft Company | Optical viewing and near infrared tracking system for a portable missle launcher |
| US5796526A (en) * | 1995-04-26 | 1998-08-18 | Texas Instruments Incorporated | Illumination optics for spatial light modulator |
| CN1280746A (en) * | 1997-10-16 | 2001-01-17 | 奥罗拉系统公司 | Light separation and recombination system for off-axis projector |
| CN101359098A (en) * | 2008-09-09 | 2009-02-04 | 东南大学 | Imaging device of coherent light |
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2011
- 2011-06-07 CN CN2011101503004A patent/CN102262297A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5193025A (en) * | 1992-01-21 | 1993-03-09 | Hughes Aircraft Company | Optical viewing and near infrared tracking system for a portable missle launcher |
| US5796526A (en) * | 1995-04-26 | 1998-08-18 | Texas Instruments Incorporated | Illumination optics for spatial light modulator |
| CN1280746A (en) * | 1997-10-16 | 2001-01-17 | 奥罗拉系统公司 | Light separation and recombination system for off-axis projector |
| CN1532585A (en) * | 1997-10-16 | 2004-09-29 | ���ܿ���ϵͳ����˾ | Light separation and recombinatin system for an off-axis projector |
| CN101359098A (en) * | 2008-09-09 | 2009-02-04 | 东南大学 | Imaging device of coherent light |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104102018A (en) * | 2014-05-08 | 2014-10-15 | 北京理工大学 | Double pit local high resolution imaging system |
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Application publication date: 20111130 |