CN103760670A - Large view field scanning infrared optical system comprising reflective spatial light modulator - Google Patents
Large view field scanning infrared optical system comprising reflective spatial light modulator Download PDFInfo
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- CN103760670A CN103760670A CN201410022252.4A CN201410022252A CN103760670A CN 103760670 A CN103760670 A CN 103760670A CN 201410022252 A CN201410022252 A CN 201410022252A CN 103760670 A CN103760670 A CN 103760670A
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Abstract
The invention relates to a large view 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 symmetry aspheric surface fairing, an achromatic rotating Ray weasley prism pair, the reflective spatial light modulator, an optical imaging system and a detector image plane. The special aspheric surface fairing meeting the fluid dynamics is adopted for the system, and thus the fluid dynamic performance is good; the reflective spatial light modulator is adopted for performing phase compensation on residual aberration of the systems when different scanning view fields exist; a detected target is dynamically scanned and imaged through an optical wedge, an imaging optical system in a subsequent optical path is fixed, and a low-temperature coil and electronic equipment do not pass through a mechanical rotating device. The system meets the dynamic characteristics of mediums and is good in imaging quality, light in weight, short in length, simple in structure and capable of achieving +/-60-degree view field scanning and being widely applied to the fields of investigation, rescue and the like.
Description
Technical field
The invention belongs to optical instrument technical field, relate to a kind of large field of view scan infrared optical system containing reflective spatial light modulator, visual field infrared focal plane imaging is specially adapted to expose thoroughly.
Background technology
The effect of infrared imagery technique in modern times scouting, rescue becomes increasingly conspicuous.The conformal radome fairing outside surface of Rotational Symmetry aspheric surface of target seeker has sharper arcuation profile, both can meet the picture element requirement of optical detection system, also can meet fluid dynamic lower resistance requirement.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.Because the residual aberration of system when the different scanning visual field is different, adopts the spatial light modulator can the aberration of corrective system when different scanning visual field, thereby obtain the high-quality imaging in large visual field.
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 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, in the time of can utilizing reflective spatial light modulator to different visual field, the residual aberration of system is carried out phase compensation, thereby can obtain at each scanning field of view the modulation transfer function (MTF) value that approaches diffraction limit.
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 reflective spatial light modulator.
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 reflective spatial light modulator of the present invention comprises: Rotational Symmetry aspheric surface radome fairing (1); double cubic surface correction 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), protecting window (9), detector image planes (10).On the direction of propagation of light, element (1) is arranged successively in order to (6), and the light being reflected back in (6) is after the reflection of Amici prism median surface, and optical axis turns clockwise 90 °, and element (7) is arranged in order on postrotational optical axis to (9).
Wherein, Rotational Symmetry aspheric surface radome fairing (1) is the aspheric surface that has rotation axes of symmetry, double cubic surface correction plate (2) is 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 and place optical element below with slot milling light path, and reflective spatial light modulator (5) is for carrying out to system the correction that phase compensation realizes aberration.
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 double cubic 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;
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 ± and 60 °.
3. in order to proofread and correct the residual different wave aberrations of system when the different scanning visual field, adopt reflective spatial light modulator (5) to carry out dynamic phase compensation to system, to realize the image quality of system when each scanning field of view, can reach diffraction limit, thereby can increase scanning angle, reduce the complexity of system initial configuration.
In order to reduce system length, meet the placement space demand of optical element, in system, used Amici prism (4) to turn back to light path, this structure has reduced the length of system effectively, make system bulk compact, in the reflecting system of using reflective spatial light modulator (5), for follow-up optical element, reserve enough placement spaces simultaneously.
By above method for designing, the scanning field of view of a kind of can be suitable for ± 60 ° of scopes of large field of view scan infrared optical system containing reflective spatial light modulator of the present invention, system architecture is simple, length is short, all can obtain the modulation transfer function (MTF) value that approaches diffraction limit at each different scanning field of view.
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, double cubic surface correction 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 again Amici prism (4), after the reflection of Amici prism (4), incide spherical optical lens group (6), then pass through successively spherical optical lens (7), spherical optical lens group (8), after protecting window (9), be irradiated in detector image planes (10), obtain last picture.
Beneficial effect
The present invention contrasts prior art and has following remarkable advantage: the present invention has adopted a kind of fluid dynamic Rotational Symmetry aspheric surface radome fairing that meets, and using a kind of double cubic surface correction plate to carry out picture element compensation, the difference residual aberration of the effect of phase compensation of simultaneously utilizing reflective spatial light modulator 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 approach diffraction limit.Contain rotation ray machine Scan Architecture, under the condition of not moving in follow-up imaging system, carry out visual field scanning (± 60 °) in a big way.System architecture is simple, volume compact, image quality are high, is 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-double cubic surface correction plate, 3-achromatism rotation Leix Lay prism pair, 4-Amici prism, 5-reflective spatial light modulator, 6-spherical optical lens group, 7-spherical optical lens, 8-spherical optical lens group, 9-protecting window, 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 reflective spatial light modulator of the present invention, comprise Rotational Symmetry aspheric surface radome fairing (1), double cubic surface correction 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), protecting window (9), detector image planes (10); On the direction of propagation of light, element (1) is arranged successively in order to (6), and the light being reflected back in (6) is after the reflection of Amici prism median surface, and optical axis turns clockwise 90 °, and element (7) is arranged in order on postrotational optical axis to (9).
In embodiment, the infrared radiation of infinite distance target transmitting passes through Rotational Symmetry aspheric surface radome fairing (1) successively, double cubic surface correction 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 again Amici prism (4), after the reflection of Amici prism (4), incide spherical optical lens group (6), then pass through successively spherical optical lens (7), spherical optical lens group (8), after protecting window (9), be irradiated in detector image planes (10), obtain last picture.
In embodiment, Rotational Symmetry aspheric surface radome fairing (1) is the aspheric surface that has rotation axes of symmetry, double cubic surface correction plate (2) is 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 and place optical element below with slot milling light path, and reflective spatial light modulator (5) is for carrying out to system the correction that phase compensation realizes aberration.
In embodiment, lens design parameter is as shown in table 1.
In embodiment, the aspheric surface radome fairing adopting meets principle of hydrodynamics, use double cubic surface correction plate to carry out picture element compensation, adopt reflective spatial light modulator to carry out dynamic compensation to the residual aberration of system, adopt rotation ray machine Scan Architecture and folding, reflecting mixing type imaging arrangement, mainly have the following advantages:
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 approach diffraction limit.
2., under the state not moving in follow-up imaging system, simplied system structure, carries out visual field scanning (± 60 °) in a big way.
3. due to the dynamic compensation effect of reflective spatial light modulator, can simplify the structure of starter system, reduce scale and the complexity of system.
Biao1(unit: mm)
Claims (3)
1. containing a large aperture large field of view scan infrared optical system for reflective spatial light modulator, it is characterized in that: comprise that Rotational Symmetry aspheric surface radome fairing (1), double cubic surface correction plate (2), achromatism rotation Leix Lay prism are to (3), Amici prism (4), reflective spatial light modulator (5), the first spherical optical lens group (6), spherical optical lens (7), the second spherical optical lens group (8), protecting window (9), detector image planes (10), on the direction of propagation of light, element Rotational Symmetry aspheric surface radome fairing (1) is arranged successively in order to the first spherical optical lens group (6), the light being reflected back in the first spherical optical lens group (6) is after the reflection of Amici prism median surface, optical axis turns clockwise 90 °, and element spherical optical lens (7) is arranged in order on postrotational optical axis to protecting window (9), the infrared radiation of infinite distance target transmitting passes through Rotational Symmetry aspheric surface radome fairing (1) successively, double cubic surface correction plate (2), achromatism rotation Leix Lay prism is to (3), Amici prism (4), reflective spatial light modulator (5), after reflective spatial light modulator reflection, incide again Amici prism (4), after the reflection of Amici prism (4), incide the first spherical optical lens group (6), then pass through successively spherical optical lens (7), the second spherical optical lens group (8), after protecting window (9), be irradiated in detector image planes (10), obtain last picture.
2. a kind of large aperture large field of view scan infrared optical system containing reflective spatial light modulator according to claim 1, it is characterized in that: Rotational Symmetry aspheric surface radome fairing (1) is the aspheric surface that has rotation axes of symmetry, double cubic surface correction plate (2) is 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 and place optical element below with slot milling light path, reflective spatial light modulator (5) is for carrying out to system the correction that phase compensation realizes aberration.
3. a kind of large aperture large field of view scan infrared optical system containing 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 dynamic (dynamical) Rotational Symmetry aspheric surface of medium radome fairing (1) that meets, use double cubic 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;
2), for system can be imaged in detector image planes in the target of large tracking field of view, adopt achromatism rotation Leix Lay 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 ± and 60 °;
3), in order to proofread and correct the residual different wave aberrations of system when the different scanning visual field, adopt reflective spatial light modulator (5) to carry out dynamic phase compensation to system, to realize the image quality of system when each scanning field of view, can reach diffraction limit, thereby can increase scanning angle, reduce the complexity of system initial configuration;
4), in order to reduce system length, meet the placement space demand of optical element, in system, used Amici prism (4) to turn back to light path, this structure has reduced the length of system effectively, make system bulk compact, in the reflecting system of using reflection type liquid crystal spatial light modulator (4), for follow-up optical element, reserve enough placement spaces simultaneously.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785566A (en) * | 2016-03-31 | 2016-07-20 | 南京大学 | Method utilizing spatial light modulator to improve photoacoustic imaging limited view angle |
| CN106712853A (en) * | 2016-12-01 | 2017-05-24 | 长春理工大学 | Onboard photoelectric platform communication launcher with optical fairing |
| CN115243017A (en) * | 2022-08-03 | 2022-10-25 | 上海研鼎信息技术有限公司 | Method and equipment for improving image quality |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262298A (en) * | 2011-06-07 | 2011-11-30 | 北京理工大学 | Large-field scanning infrared optical system comprising transmission-type spatial light modulator |
| CN102262297A (en) * | 2011-06-07 | 2011-11-30 | 北京理工大学 | Large-field scanning infrared optical system comprising reflective spatial light modulator |
| CN102322959A (en) * | 2011-06-07 | 2012-01-18 | 北京理工大学 | Large visual field scanning infrared optical system containing aspherical fairing |
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- 2014-01-17 CN CN201410022252.4A patent/CN103760670A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262298A (en) * | 2011-06-07 | 2011-11-30 | 北京理工大学 | Large-field scanning infrared optical system comprising transmission-type spatial light modulator |
| CN102262297A (en) * | 2011-06-07 | 2011-11-30 | 北京理工大学 | Large-field scanning infrared optical system comprising reflective spatial light modulator |
| CN102322959A (en) * | 2011-06-07 | 2012-01-18 | 北京理工大学 | Large visual field scanning infrared optical system containing aspherical fairing |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785566A (en) * | 2016-03-31 | 2016-07-20 | 南京大学 | Method utilizing spatial light modulator to improve photoacoustic imaging limited view angle |
| CN106712853A (en) * | 2016-12-01 | 2017-05-24 | 长春理工大学 | Onboard photoelectric platform communication launcher with optical fairing |
| CN106712853B (en) * | 2016-12-01 | 2023-03-31 | 长春理工大学 | Communication transmitting device with optical fairing applicable to airborne photoelectric platform |
| CN115243017A (en) * | 2022-08-03 | 2022-10-25 | 上海研鼎信息技术有限公司 | Method and equipment for improving image quality |
| CN115243017B (en) * | 2022-08-03 | 2024-06-07 | 上海研鼎信息技术有限公司 | Method and equipment for improving image quality |
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Application publication date: 20140430 |