CN219122413U - High-speed view field expanding device - Google Patents
High-speed view field expanding device Download PDFInfo
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- CN219122413U CN219122413U CN202222821680.6U CN202222821680U CN219122413U CN 219122413 U CN219122413 U CN 219122413U CN 202222821680 U CN202222821680 U CN 202222821680U CN 219122413 U CN219122413 U CN 219122413U
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Abstract
The utility model discloses a high-speed view field expanding device, which comprises a light source emitting module, a core electric scanning module, a camera control receiving module and an image processing module which are sequentially arranged along a light path; the light source emission module is used for generating laser; the core electric scanning module comprises a first electric scanning module and a second electric scanning module, wherein the first electric scanning module deflects the collimated linear polarized light generated by the light source emission module according to a certain angle and then projects the collimated linear polarized light onto an imaging target; the second electric scanning module receives polarized light reflected by the imaging target, deflects the polarized light by a certain angle and then enters the camera control receiving module; the camera control receiving module carries out perception imaging on polarized light reflected by an imaging target, and carries out time sequence control on the core electric scanning module to obtain a plurality of sequential sub-field images; and the terminal image processing module is used for splicing and fusing the plurality of sequential sub-view field images and outputting the images. The utility model realizes non-mechanical field expansion and rapid scanning imaging, and has high response speed.
Description
Technical Field
The utility model belongs to the technical field of laser imaging, and particularly relates to a high-speed view field expanding device.
Background
In the prior art, the laser active illumination imaging system mainly realizes the expansion of the field of view through a traditional zoom lens, but the zoom lens is expensive and heavy, and the imaging resolution is limited by the number of array elements of a CCD image sensor, so that the expansion is difficult. Other view expansion modes, such as Hua is a laser radar adopting an MEMS micro-vibrating mirror structure, wherein the horizontal view angle is 120 degrees, the scanning frequency is 10Hz, and if the view angle is 30 degrees, the corresponding scanning frequency is 40Hz. The device is based on a liquid crystal electric control half wave plate, the same angle of view is 30 degrees, and the corresponding scanning frequency is 125Hz. The field of view range expansion and the fast response output are therefore difficult to achieve simultaneously in existing laser active imaging systems.
Disclosure of Invention
In order to meet at least one defect or improvement requirement of the prior art, the utility model provides a high-speed view field expansion device, which comprises a light source emitting module, a core electric scanning module, a camera control receiving module and an image processing module which are sequentially arranged along a light path, and aims to realize rapid range expansion of a view field.
The light source emission module is used for generating laser and converting the laser into collimated linearly polarized light;
the core electric scanning module comprises a first electric scanning module and a second electric scanning module, wherein the first electric scanning module is coaxial with the center of the light source emission module and is used for deflecting collimated polarized light generated by the light source emission module according to a certain angle and then projecting the collimated polarized light onto an imaging target; the second electric scanning module is coaxial with the center of the camera control receiving module and is used for receiving polarized light reflected by the imaging target and deflecting the polarized light by a certain angle to enter the camera control receiving module;
the camera control receiving module is used for performing perception imaging on polarized light reflected by the imaging target and performing time sequence control on the core electric scanning module to obtain a plurality of sequential sub-field images;
the image processing module is used for splicing and fusing the plurality of sequential sub-view field images received by the camera control receiving module and outputting the images.
Preferably, the first electric scanning module and the second electric scanning module respectively comprise multi-stage stacked electric scanning sub-modules, each stage of the electric scanning sub-modules respectively deflects polarized light at different angles, and the multi-stage electric scanning sub-modules are used for stacking the deflection angles of the polarized light step by step.
Preferably, the sum of the deflection ranges of the electronic scanning sub-modules does not exceed the clear aperture of the electronic scanning module.
Preferably, the camera control receiving module comprises an amplifying unit, an imaging unit and a time sequence control unit; the amplifying unit is used for amplifying an imaging field angle, the imaging unit carries out perception imaging on polarized light reflected by a target, and the time sequence control unit carries out time sequence synchronous control on each stage of electric scanning sub-module and the imaging unit respectively and obtains a plurality of sequential sub-field images according to the time sequence.
Preferably, each of the electronic scanning submodules comprises a half wave plate, a quarter wave plate and a polarization grating device which are arranged in parallel and in the same direction.
Preferably, the half-wave plate is an electric control liquid crystal half-wave plate prepared from ferroelectric liquid crystal or dual-frequency liquid crystal high-speed response material.
Preferably, the polarization grating device adopts angle multiplexing holographic grating, liquid crystal grating or ultra-surface micro-nano structure grating and other devices.
Preferably, the active illumination light source emitting module comprises a laser, a collimator, a polarizer and a beam expanding lens, wherein the polarizer changes laser output by the laser into linearly polarized light, and the beam expanding lens expands the linearly polarized light and adjusts the beam diameter.
Preferably, the timing control unit is a timing controller or a timing control circuit.
In general, the above technical solutions conceived by the present utility model, compared with the prior art, enable the following beneficial effects to be obtained:
(1) The high-speed view field expansion device provided by the utility model utilizes the multi-stage laminated electric scanning sub-module in the core electric scanning module to deflect polarized light at different angles to form a plurality of laminated sub-view fields, then carries out time sequence control and imaging on the plurality of sub-view fields to form a plurality of sequential sub-view field images, and then carries out splicing and fusion on the plurality of sequential sub-view field images, thereby realizing the expansion of the view field range.
(2) Compared with the traditional high-speed mechanical quick reflection device, the high-speed visual field expansion device provided by the utility model has the advantages that the response frequency of each stage of electric scanning sub-module is higher, and the non-mechanical visual field expansion and quick scanning imaging are realized in a visual enhancement system.
Drawings
FIG. 1 is a schematic view of a high-speed field-of-view expanding device according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a high-speed field-of-view expanding device according to an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Fig. 1 and fig. 2 are schematic diagrams of a high-speed field-of-view expanding device provided by the present utility model, and as shown in fig. 1 and fig. 2, the high-speed field-of-view expanding device includes a light source emitting module 100, a core electric scanning module 200, a camera control receiving module 300, and a terminal image processing module 400;
the light source emitting module 100 is configured to generate laser light and convert the laser light into collimated linearly polarized light;
the core electric scanning module 200 comprises a first electric scanning module and a second electric scanning module, wherein the first electric scanning module is coaxial with the center of the light source emission module and is used for deflecting the collimated polarized light generated by the light source emission module by a certain angle and then projecting the collimated polarized light onto an imaging target; the second electric scanning module is coaxial with the center of the camera control receiving module and is used for receiving polarized light reflected by the imaging target and deflecting the polarized light by a certain angle to enter the camera control receiving module;
the camera control receiving module 300 is configured to perform perceptual imaging on polarized light reflected by the imaging target, and perform timing control on the core electric scanning module to obtain a plurality of sequential sub-field images;
the terminal image processing module 400 is configured to splice and fuse the multiple sequential sub-field images received by the camera control receiving module and output the fused images.
Wherein the light source emitting module 100 comprises a laser 101, a collimator 102, a polarizer 103 and a lens 104, which are arranged in order along the light path. The laser 101 is used for emitting laser beams, the collimator 102 is used for collimating the beams generated by the laser, the polarizer 103 is used for obtaining polarized light from the collimated beams, and the lens 104 is used as the final device of the module and is responsible for adjusting the output spot size.
In a specific embodiment, the laser 101 has a wavelength band of 808nm and an output power of 0-18W; the interface of the collimator 102 is SMA905; the extinction ratio of polarizer 103 is 100000:1; the imaging range of lens 104 is 1/1.8 "and the focal length is 4.4-11mm.
Specifically, the core electric scanning module 200 adopts a mode of combining multiple stages of sub-modules, the first electric scanning module and the second electric scanning module respectively comprise multiple stages of stacked electric scanning sub-modules, each stage of the electric scanning sub-modules respectively deflects polarized light at different angles, and the multiple stages of electric scanning sub-modules are used for stacking the deflection angles of the polarized light step by step. In order to ensure that the progressive deflection of the electric scanning submodule to light rays cannot deflect outside the module, the sum of deflection ranges of the multistage electric scanning submodule does not exceed the clear aperture of the electric scanning module, wherein the clear aperture refers to an effective area of a wave plate in the electric scanning submodule, through which light can pass.
The first electric scanning module comprises sub-modules 210, 220 and 230, is arranged at the rear end of the active illumination light source emitting module 100 and is coaxial with the center of the active illumination light source emitting module and is used for deflecting emitted light so as to scan target sub-fields one by one; the second electric scanning module includes sub-modules 240, 250, 260 disposed at the front end of the camera control receiving module 300 coaxially with the center thereof for deflecting the signal light reflected back from the object.
More specifically, each electronic scanning submodule comprises a first wave plate, a second wave plate, a polarization grating device and a third wave plate which are sequentially arranged in parallel and in the same direction, wherein the first wave plate is used for changing the polarization state of the received collimated polarized light; the second wave plate is used for changing linearly polarized light into circularly polarized light in a corresponding state; the polarization grating device is used for deflecting the light beam at a directional angle; the third wave plate is used for converting circularly polarized light into linearly polarized light.
More specifically, the first wave plate is an electronically controlled liquid crystal half wave plate; the second wave plate and the third wave plate are quarter wave plates.
In one specific example, the response frequency of the half-wave plate is 10kHz, the quarter-wave plate band is 808nm, and the aperture of the liquid crystal polarization grating is 25.4mm.
Preferably, the half-wave plate is an electric control liquid crystal half-wave plate prepared from ferroelectric liquid crystal or dual-frequency liquid crystal high-speed response material.
Preferably, the polarization grating device adopts angle multiplexing holographic grating, liquid crystal grating or ultra-surface micro-nano structure grating and other devices.
The camera control receiving module is used for performing perception imaging on polarized light reflected by the imaging target and performing time sequence control on the core electric scanning module to obtain a plurality of sequential sub-field images;
the camera control receiving module comprises an amplifying unit, an imaging unit and a time sequence control unit; the amplifying unit is used for amplifying an imaging field angle, the imaging unit carries out perception imaging on polarized light reflected by a target, and the time sequence control unit carries out time sequence synchronous control on each stage of electric scanning sub-module and the imaging unit respectively and obtains a plurality of sequential sub-field images according to the time sequence.
In a specific embodiment, the magnification unit comprises a magnification component 301 with a magnification of 6 times and a field angle of 11 degrees, and a lens 302 with a focal length of 3.5mm and a standard C-mouth; the imaging unit is an image sensor 303 with a frame rate of 860fps@640×480 and a pixel of 4.8 μm, and the image sensor 303 is connected with the terminal image processing module 400 through a data connection line 508 to perform data transmission on the terminal image processing module 400; the timing control unit includes a multiplexed timing controller 304, which performs timing control on each sub-level half-wave plate and the camera 303 in the core electric scanning module 200 through data connection lines 501, 502, 503, 504, 505, 506, 507, respectively.
The terminal image processing module 400 is configured to splice and fuse the multiple sequential sub-field images received by the camera control receiving module and output the fused images. The system comprises an industrial personal computer with program control, and each received sub-view field image in the whole period is quickly spliced and fused into a high-resolution large-view field image and continuously output.
Fig. 2 is a schematic diagram of an electric scanning module structure and a polarization state of a light beam of a high-speed field-of-view expanding device according to an embodiment of the present utility model, where in the embodiment, a core electric scanning module includes several stages of electric scanning sub-modules, and each electric scanning sub-module includes an electrically controlled liquid crystal half-wave plate, a quarter-wave plate, and a liquid crystal polarization grating device that are arranged in a co-directional order.
For the sub-module 210, 211 refers to a ferroelectric liquid crystal electric control half wave plate with response frequency of 10kHz, 212 refers to a quarter wave plate with wave band of 808nm, and 213 refers to a liquid crystal polarization grating with deflection angle of 1.5 degrees and caliber of 25.4 mm; for other sub-modules 220, 230, 240, 250, 260, 221, 231, 241, 251, 261 are ferroelectric liquid crystal electrically controlled half wave plates with response frequency of 10 kHz; 222. 232, 242, 252, 262 are also quarter wave plates with a wavelength band of 808 nm; 223. 233, 243, 253, 263 are respectively liquid crystal polarization gratings with deflection angles of 3 degrees, 6 degrees, 1.5 degrees, 3 degrees and 6 degrees and apertures of 25.4mm.
Further, taking the sub-module 210 as an example, the state of the light beam passing through the sub-module is: the collimated polarized light enters the ferroelectric liquid crystal electric control half wave plate 211, and the polarization state of the collimated polarized light is changed; the incident quarter wave plate 212, the linearly polarized light becomes circularly polarized light of a corresponding state; incident on the liquid crystal polarization grating 213, the light beam is directionally deflected; incident on the quarter 212, the circularly polarized light is again converted into linearly polarized light in preparation for entering the next sub-module.
The utility model provides a high-speed view field expansion device, which has the principle that: the field of view range is extended by forming a plurality of stacked sub-fields of view with multi-layered electronic scan sub-modules in the core electronic scan module. When the electric scanning module works, the angle switching number P of the electric scanning visual field and the number N of the electric scanning submodules contained in the core electric scanning module have quantitative expression relation: p=2 N . For example, the core electric scanning module includes 2-stage electric scanning sub-modules, and the number of angle switches that the core electric scanning module can realize the electric scanning of the field of view is: p=2 2 =4. For another example, if the core electric scanning module includes 3-stage electric scanning sub-modules, the number of angle switches for the core electric scanning module to realize electric scanning of the field of view is: p=2 3 =8. Illustratively, a camera with a field of view in the range of 4 ° can be used for a range of 4 ° around its central axisAfter a 3-level core electric scanning module is added, theoretically, the imaging field of view is increased from 4 degrees to 8×4 degrees=32 degrees, the overlapping area between the fields of view at all angles is 0.5 degrees, the actual imaging field of view range is 32 ° -0.5 ° × (8-1) =28.5 degrees, and compared with the original 4-degree field of view range, the imaging field of view range is increased by 24.5 degrees, and the imaging field of view range is improved.
In summary, according to the high-speed view field expansion device provided by the utility model, polarized light is deflected at different angles by using the multi-stage stacked electric scanning sub-modules in the core electric scanning module to form a plurality of stacked sub-view fields, then the plurality of sub-view fields are subjected to time sequence control and imaging to form a plurality of sequential sub-view field images, and then the plurality of sequential sub-view field images are subjected to splicing and fusion, so that the expansion of the view field range is realized.
Compared with the traditional high-speed mechanical quick reflection device, the high-speed visual field expansion device provided by the utility model has the advantages that the response frequency of each stage of electric scanning sub-module is higher, and the non-mechanical visual field expansion and quick scanning imaging are realized in a visual enhancement system.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (9)
1. The high-speed view field expanding device is characterized by comprising a light source emitting module, a core electric scanning module, a camera control receiving module and an image processing module which are sequentially arranged along a light path;
the light source emission module is used for generating laser and converting the laser into collimated linearly polarized light;
the core electric scanning module comprises a first electric scanning module and a second electric scanning module, wherein the first electric scanning module is coaxial with the center of the light source emission module and is used for deflecting collimated polarized light generated by the light source emission module according to a certain angle and then projecting the collimated polarized light onto an imaging target; the second electric scanning module is coaxial with the center of the camera control receiving module and is used for receiving polarized light reflected by the imaging target and deflecting the polarized light by a certain angle to enter the camera control receiving module;
the camera control receiving module is used for performing perception imaging on polarized light reflected by the imaging target and performing time sequence control on the core electric scanning module to obtain a plurality of sequential sub-field images;
the image processing module is used for splicing and fusing the plurality of sequential sub-view field images received by the camera control receiving module and outputting the images.
2. The high-speed field-of-view expanding apparatus according to claim 1, wherein the first and second electric scanning modules respectively include electric scanning sub-modules stacked in multiple stages, each of the electric scanning sub-modules respectively deflecting polarized light in different angles, and the multiple stages of electric scanning sub-modules superimpose the deflecting angles of the polarized light in stages.
3. The high-speed field of view expansion device of claim 2, wherein the sum of the deflection ranges of the electronic scanning sub-module does not exceed the clear aperture of the electronic scanning module.
4. The high-speed field-of-view expanding apparatus according to claim 2, wherein the camera control receiving module includes an amplifying unit, an imaging unit, and a timing control unit; the amplifying unit amplifies the received polarized light, the imaging unit carries out perception imaging on the amplified polarized light, and the time sequence control unit carries out time sequence synchronous control on each stage of the electric scanning sub-module and the imaging unit respectively, so that a plurality of sequential sub-view field images are obtained.
5. The high-speed field-of-view expanding apparatus according to claim 2, wherein each of the electric scanning sub-modules comprises a first wave plate, a second wave plate, a polarization grating device and a third wave plate which are sequentially arranged in parallel and in the same direction, and the first wave plate is used for changing the polarization state of the received collimated polarized light; the second wave plate is used for changing linearly polarized light into circularly polarized light in a corresponding state; the polarization grating device is used for deflecting the light beam at a directional angle; the third wave plate is used for converting circularly polarized light into linearly polarized light.
6. The high-speed field-of-view expanding apparatus according to claim 5, wherein the first wave plate is an electronically controlled liquid crystal half wave plate; the second wave plate and the third wave plate are quarter wave plates.
7. The high-speed field-of-view expansion device of claim 5, wherein the polarization grating device employs an angle multiplexed holographic grating, a liquid crystal grating, or a micro-nano structured ultra-surface grating.
8. The high-speed field-of-view expansion device according to claim 1, wherein the light source emitting module comprises a laser, a collimator, a polarizer, and a beam expanding lens, the polarizer converting laser light output from the laser into linearly polarized light, the beam expanding lens expanding the linearly polarized light output and adjusting a beam diameter.
9. The high-speed field of view expanding apparatus according to claim 4, wherein the timing control unit is a timing controller or a timing control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222821680.6U CN219122413U (en) | 2022-10-25 | 2022-10-25 | High-speed view field expanding device |
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| CN202222821680.6U CN219122413U (en) | 2022-10-25 | 2022-10-25 | High-speed view field expanding device |
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| CN219122413U true CN219122413U (en) | 2023-06-02 |
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| CN202222821680.6U Active CN219122413U (en) | 2022-10-25 | 2022-10-25 | High-speed view field expanding device |
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