CN108957715B - Coaxial photoelectric reconnaissance system - Google Patents
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- CN108957715B CN108957715B CN201811094797.0A CN201811094797A CN108957715B CN 108957715 B CN108957715 B CN 108957715B CN 201811094797 A CN201811094797 A CN 201811094797A CN 108957715 B CN108957715 B CN 108957715B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0605—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors
- G02B17/061—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors on-axis systems with at least one of the mirrors having a central aperture
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/1822—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors comprising means for aligning the optical axis
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Abstract
The invention belongs to the field of reconnaissance systems, and particularly relates to a coaxial photoelectric reconnaissance system which comprises a Cassegrain afocal coaxial two-reflection common optical path, an infrared imaging system and a visible light imaging system; the Cassegrain afocal coaxial two-reflection common light path comprises a primary mirror and a secondary mirror, and light rays emitted by a target are reflected and collimated twice by the primary mirror and the secondary mirror and then emit parallel light; a reflector is arranged on a path of parallel light emitted by the Cassegrain afocal coaxial two reflection common light paths to realize light conversion on the parallel light; the first transflective mirror is arranged on a reflection light path of the reflector to realize the reflection of infrared light and the transmission of visible light; the visible light imaging system is used for receiving the visible light transmitted by the first transflective lens and imaging; the infrared imaging system is used for receiving the infrared light reflected by the first transflective mirror and imaging. The system can integrally combine visible light, an infrared band optical system and a laser optical system under a small volume, and can realize the observation of targets under various environments.
Description
Technical Field
The invention belongs to the field of reconnaissance systems, and particularly relates to a coaxial photoelectric reconnaissance system.
Background
At present, single reconnaissance technologies such as a remote thermal imaging technology, a CMOS image sensing technology, a semiconductor laser pumping technology and the like gradually mature, a plurality of sensing technologies are integrated, the advantages of the sensing technologies are complemented, and tasks such as day and night battlefield monitoring, target identification and indication, firepower striking guidance and the like can be effectively completed. The visible light, infrared band optical system and laser optical system are designed separately and independently in China, so that the system is large in size and weight, and meanwhile, the non-parallelism of optical axes among the systems needs to be calibrated in a complex way and is unstable in later period. In addition, when the external observation environment changes, such as the target is shielded, camouflaged and disturbed by smoke, and the light path and the wave band are switched, the target needs to be searched again, and when the moving speed of the observation target is too high, the target can be lost. The current technical approach of simply piecing together all the sensors is difficult to meet future application with increasingly strict requirements on size and weight, so that the research on a miniaturized coaxial photoelectric reconnaissance system has important significance.
Disclosure of Invention
The application provides a coaxial photoelectric reconnaissance system, it will be to visible light, infrared band optical system and laser optical system whole combination under less volume, realizes observing the target under various environment.
In order to achieve the technical purpose, the coaxial photoelectric reconnaissance system comprises a Cassegrain afocal coaxial two-reflection common optical path, an infrared imaging system and a visible light imaging system;
the Cassegrain afocal coaxial two-reflection common light path comprises a primary mirror and a secondary mirror, and parallel light is emitted after light rays emitted by a target are reflected and collimated twice by the primary mirror and the secondary mirror by controlling the curvatures of the primary mirror and the secondary mirror;
the path of the parallel light emitted by the Cassegrain afocal coaxial two anti-common light paths is provided with a reflector, and the reflector realizes light conversion on the parallel light emitted by the Cassegrain afocal coaxial two anti-common light paths;
the first transflective mirror is arranged on a reflection light path of the reflector to realize the reflection of infrared light and the transmission of visible light;
the visible light imaging system is used for receiving the visible light transmitted by the first transflective lens and imaging;
the infrared imaging system is used for receiving the infrared light reflected by the first transflective mirror and imaging.
As an improved technical scheme of the invention, a fast reflecting mirror is arranged between the reflecting mirror and the first transflective mirror and is used for completely reflecting the reflected light of the reflecting mirror to the first transflective mirror.
As the improved technical scheme of the invention, the coaxial photoelectric detection system also comprises a laser irradiation system and a second transflective mirror; the second transflective lens is arranged between the first transflective lens and the visible light imaging system and positioned on a transmission light path of the first transflective lens; the laser irradiation system is used as a laser light source, and the emitted laser beams enter the Cassegrain afocal coaxial two anti-common light paths after being reflected by the second transflective lens, transmitted by the first transflective lens and reflected by the reflector and are parallel to the optical axes of the Cassegrain afocal coaxial two anti-common light paths.
As an improved technical scheme of the invention, a switching mirror is also arranged between the first transflective mirror and the infrared imaging system, the switching mirror is arranged on a reflected light path of the first transflective mirror, and the infrared imaging system receives reflected light of the switching mirror for imaging.
As an improved technical scheme of the invention, the coaxial photoelectric reconnaissance system further comprises an optical axis self-calibration module and a third reflector, wherein the optical axis self-calibration module comprises an attenuation sheet, and a multispectral light source, a multispectral comprehensive target and a Cassegrain system which are sequentially arranged; the geometric center of the multispectral comprehensive target is provided with a central mark line, and the multispectral light source illuminates the multispectral comprehensive target; the Cassegrain system is used for emitting light penetrating through the multispectral comprehensive target in parallel; the third reflector is arranged between the Cassegrain system and the first transflective mirror and is used for reflecting the parallel light emitted by the Cassegrain system to the first transflective mirror.
As an improved technical scheme of the invention, the spectrum comprehensive target is arranged on the multidimensional adjusting mechanism.
As an improved technical scheme of the invention, the coaxial photoelectric detection system adopts the following steps to calibrate the optical axis: placing a third reflector at the inlet of the Cassegrain system;
initially aligning, and adjusting the position of the multispectral comprehensive target surface to ensure that the multispectral comprehensive target surface is vertical to the optical axis of the Cassegrain system;
finishing the setting of a reference optical axis, and ensuring that the laser spot center of a laser irradiation system is superposed with the geometric center of the multispectral comprehensive target surface;
completing the consistency test of the visible light optical axis and the laser emission optical axis, closing the laser irradiation system, starting the multispectral light source, observing the coincidence of the central marking lines of the cross target on the visible light imaging system and the multispectral comprehensive target surface, and if the central marking lines are coincident, the visible light optical axis is consistent with the laser emission optical axis; if the two target surfaces do not coincide, the pixel interval of the central mark line of the cross target and the multispectral comprehensive target surface on the visible light imaging system is the deviation amount of the visible light optical axis and the laser emission optical axis;
completing the consistency test of the infrared optical axis and the laser emission optical axis, closing the laser irradiation system, starting the multispectral light source, observing the coincidence of the central marking lines of the cross target and the multispectral comprehensive target surface on the infrared imaging system, and if the central marking lines are coincident, ensuring that the visible light optical axis is consistent with the laser emission optical axis; if the two target surfaces do not coincide, the pixel interval of the central mark line of the cross target and the multispectral comprehensive target surface on the infrared imaging system is the deviation amount of the infrared optical axis and the laser emission optical axis;
and according to the deviation amount of the visible light optical axis and the laser emission optical axis and the deviation amount of the infrared optical axis and the laser emission optical axis, the consistency adjustment of the three optical axes is completed by adopting an image processing method and the positions of the fast reflection mirrors.
As the improved technical scheme of the application, the photoelectric reconnaissance system also comprises an infrared middle-short focus two-gear zooming front-mounted optical module; the angle of the switching mirror is adjusted, and the infrared imaging system can receive infrared middle-short focus two-gear zooming front-mounted optical module emergent ray imaging through the switching mirror.
Advantageous effects
The application adopts the Cassegrain afocal coaxial two-reflection common-path optical module to realize that the transmitting light path of the long-focus visible/long-focus infrared/small laser illuminator shares the light path, meets the requirements of identifying and measuring targets, also plays a role in carrying out aperture compression on incident parallel light rays, and introduces a fast reflection mirror in the compressed emergent parallel light path to carry out optical image stabilization on the three light paths; a fast reflecting mirror is added in a long-focus infrared optical system to realize high-speed search and tracking of an aerial target and adjustment of an infrared optical axis; the infrared medium-short focus two-shift zooming front-mounted optical module and the Cassegrain afocal coaxial two-reflection common-path optical module share an infrared detector, and the infrared medium-short focus optical module and the infrared long focus optical module are used in a time-sharing mode by utilizing a switching mirror; the visible light medium-short-focus continuous zooming optical module meets the searching requirement on a target and shares a light path with a receiving light path of the small laser illuminator; the optical axis self-calibration module realizes consistency detection of three optical axes of the Cassegrain afocal coaxial two-reflection common-path optical module; in the process of detecting and identifying the target, the visible image/infrared image/video is fused by using the image fusion and feature identification processing board, so that the probability of target feature identification is improved.
A compact Cassegrain system is designed in the optical axis self-calibration module, and has the advantages of good image quality, long focal length, and application of a folding compact structure, and the tube length can be shortened to 1/3 of the focal length.
In conclusion, the visible light imaging system, the infrared light imaging system and the laser irradiation system are coaxially designed, so that the size and the weight of the equipment can be effectively reduced; the automatic calibration device can perform internal automatic calibration, and saves external calibration procedures; and the requirement for miniaturization and light weight of equipment is met.
Drawings
FIG. 1 is a schematic structural view of a coaxial photoelectric detection system of the present application; in the figure: 1. the Cassegrain afocal coaxial two-reflection common light path; 2. a mirror; 3. a fast reflecting mirror; 4. a first transflective mirror; 5. a second transflective mirror; 6. a visible light imaging system; 7. an optical axis self-calibration module; 8. a laser irradiation system; 9. switching a mirror; 10. an infrared imaging system.
FIG. 2 is a schematic view of a visible light imaging system in the coaxial photoelectric detection system of the present application; in the figure, 1, Cassegrain afocal and coaxial two reflection common optical paths; 2. a mirror; 3. a fast reflecting mirror; 4. a first transflective mirror; 5. a second transflective mirror; 6. a visible light imaging system.
FIG. 3 is a schematic diagram of an optical axis self-calibration module according to the present application; 1. a visible light imaging system; 2. the Cassegrain system; 3. an attenuation sheet; 4. a multi-dimensional adjustment mechanism; 5. multispectral comprehensive target; 6. a multi-spectral light source; 7. a housing.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
This application is in the design, when realizing long focal length to current distributed photoelectric reconnaissance system, the barrel length overlength, and need use the special glass material of multi-disc to rectify the colour difference, volume and weight can all grow, be very unfavorable for the miniaturization of platform and lightweight problem, adopt primary and secondary mirror reflection formula afocal compression collimation system as public light path, the mode that adopts the beam split at the back is with visible wave band, medium wave infrared wave band and laser part, adopt imaging lens to image respectively, acquire visible light and medium wave infrared image simultaneously, this light path outgoing in-process can not focus simultaneously, the air ionization phenomenon of laser outgoing in-process has also been avoided, laser has finally been realized, visible light and infrared optical axis of sharing design.
In the light path, light rays emitted by a target pass through a primary mirror and a secondary mirror firstly, and are reflected and collimated twice to form parallel light; a reflector is added in the parallel light path to fold the light path so as to reduce the volume of the system and facilitate the design of a light-passing port of the optical axis self-calibration module; a fast reflector is added into the parallel light reflected by the reflector to perform secondary stabilization on visible light, infrared light and laser emission optical axes; then, the parallel light beams pass through the first spectroscope, the laser and visible light optical paths are transmitted, and the medium wave infrared light beams are reflected; the medium wave infrared light beam firstly passes through the fast reflection mirror and then enters the infrared imaging system, so that medium wave infrared small-field-of-view imaging detection and space-to-space high-speed search are realized; the light path of the emitted laser and the visible light passes through the second spectroscope, the laser is reflected, and the visible light passes through the second spectroscope; visible light enters a visible light system to realize small-field visible light detection; light waves emitted by the laser can be reflected by the reflector for multiple times and finally enter the Cassegrain afocal coaxial two reflection light paths to realize collimation, beam expansion and irradiation.
The concrete presentation is as follows: as shown in fig. 1, a coaxial photoelectric detection system comprises a cassegrain afocal coaxial two-reflection common optical path, an infrared imaging system and a visible light imaging system;
the Cassegrain afocal coaxial two-reflection common light path comprises a primary mirror and a secondary mirror, and the curvature of the primary mirror and the curvature of the secondary mirror are controlled so that light rays emitted by a target are reflected and collimated twice by the primary mirror and the secondary mirror to emit parallel light.
In order to ensure that emergent light is parallel light, the design of the Cassegrain afocal coaxial two-reflection optical module adopts a gradual modification method, namely a structure which is close to the designed optical system in performance is found from optical design data or patents to serve as an initial structure of the system, and the aberration is repeatedly optimized through the automatic correction and balance functions of aberration in optical design software until good imaging quality is obtained.
The reflector 2 is arranged on a path of the parallel light emitted by the Cassegrain afocal coaxial two reflective common light paths 1, and the reflector 2 realizes light conversion on the parallel light emitted by the Cassegrain afocal coaxial two reflective common light paths 1;
the first transflective mirror 4 is arranged on a reflection light path of the reflector 2 to realize the reflection of infrared light and the transmission of visible light.
As shown in fig. 2, the visible light imaging system 6 is used for receiving and imaging the visible light transmitted through the first transflective mirror 4; the infrared imaging system 10 is used for receiving the infrared light reflected by the first transflective mirror 4 and imaging. The visible light imaging system uses a visible light detector to assist in imaging, and the visible light detector is mainly divided into two types, namely a CCD sensor and a CMOS sensor, and preferably a CMOS sensor. Infrared detectors for infrared imaging systems are mainly classified into mct (mct), (hgcdte) infrared detectors and QWIP quantum well infrared detectors. The temperature variation is large in consideration of the operating environment of the medium wave infrared system of the system, and therefore, a refrigeration type detector will be used. The MCT refrigeration type medium wave infrared detector with 640 x 512 pixels produced by Sofradir company of France is adopted in the design. The imaging process mainly adopts: high resolution infrared image reconstruction techniques, high performance multi-source image fusion techniques, and/or high reliability target identification techniques.
In order to simplify the structure, a fast reflecting mirror 3 is arranged between the reflecting mirror and the first transflective mirror, and the fast reflecting mirror 3 is used for completely reflecting the reflected light of the reflecting mirror 2 to the first transflective mirror 4. The reflecting mirror (FSM) is used for secondary stabilization of three optical axes, and the fast reflecting mirror (FSM) is used for phase compensation of infrared searching and tracking and parallelism adjustment of the infrared optical axes.
A switching mirror 9 is further arranged between the first transflective mirror 4 and the infrared imaging system 10, the switching mirror 9 is arranged on a reflection light path of the first transflective mirror 4, and the infrared imaging system 10 receives reflected light of the switching mirror 9 for imaging.
In order to facilitate reconnaissance in different environments, the coaxial photoelectric reconnaissance system further comprises a laser irradiation system and a second transflective mirror; the second transflective lens is arranged between the first transflective lens and the visible light imaging system and positioned on a transmission light path of the first transflective lens; the laser irradiation system 8 is used as a laser light source, and the emitted laser beam enters the Cassegrain afocal coaxial two anti-common light paths 1 after being reflected by the second transflective mirror 5, transmitted by the first transflective mirror 4 and reflected by the reflecting mirror 2, and is parallel to the optical axis of the Cassegrain afocal coaxial two anti-common light paths 1.
The optical axis self-calibration module 7 is adopted in the coaxial detection.
Aiming at the problems of short action distance, poor anti-interference capability, incapability of working all weather and the like caused by the fact that a single waveband can not fully reflect the target attribute, a multiband optical integration technology and a photoelectric parameter matching optimization technology based on efficiency matching are adopted to carry out system reasonable integration on multiband sensors, parameters of all photoelectric sensors are optimized, the battlefield sensing capability of a photoelectric comprehensive system is improved, all weather, wide coverage and high resolution target observation is realized, and more accurate and comprehensive target information is obtained. The concrete improvement is as follows: the photoelectric reconnaissance system also comprises an infrared medium-short focus two-gear zooming preposed optical module (prior art); the angle of the switching mirror is adjusted, and the infrared imaging system can receive infrared middle-short focus two-gear zooming front-mounted optical module emergent ray imaging through the switching mirror. The photoelectric reconnaissance system also comprises a visible light medium-short-focus continuous zoom optical module (prior art), and the visible light imaging system can receive emergent light images of the visible light medium-short-focus continuous zoom optical module.
At present, the commonly used optical axis consistency detection methods mainly include a projection target plate method, a laser optical axis instrument method, a pentaprism method, a large-caliber parallel light tube method and a light splitting path projection method, but the methods belong to an external photoelectric reconnaissance system, and either the target plate needs to be arranged in the field or the method is only suitable for laboratory tests and cannot meet the technical index requirements of a miniaturized photoelectric reconnaissance system.
In order to conveniently calibrate three optical axes, the coaxial photoelectric reconnaissance system further comprises an optical axis self-calibration module and a third reflector, as shown in fig. 3, the optical axis self-calibration module comprises a shell 7, an attenuation sheet 3 arranged in the shell 7, and a multispectral light source 6, a multispectral comprehensive target 5 and a cassegrain system 2 which are sequentially arranged; the geometric center of the multispectral comprehensive target is provided with a central mark line, and the multispectral light source 6 illuminates the multispectral comprehensive target; the Cassegrain system is used for emitting light penetrating through the multispectral comprehensive target in parallel; the third reflector is arranged between the Cassegrain system and the first transflective mirror, and is used for reflecting the parallel light emitted by the Cassegrain system to the first transflective mirror and receiving and imaging by the visible light imaging system 1 or the infrared imaging system. Wherein, the spectrum integrated target is arranged on the multidimensional adjusting mechanism 4. The multispectral comprehensive target 5 is a ZnS glass full-spectrum transmission band which is used, the temperature difference between a target and a background can be generated at the same actual temperature, and a target pattern of the chromium-plated material can be etched on a target plate by adopting a photoetching technology, so that the accuracy is high.
The optical axis self-calibration module adopts a method of projecting an infinite target based on a collimator, takes a compact Cassegrain system and a multispectral comprehensive target as cores, and applies a high-performance image processing technology to realize the consistency test and the adjustment of the optical axis of the Cassegrain afocal coaxial two-reflection common-path optical module. The working principle is as follows: the compact Cassegrain system is designed in the optical axis self-calibration module, the multispectral comprehensive target and the multispectral light source are placed at the focus of the optical axis self-calibration module, and when the multi-optical axis consistency is tested in an aiming mode, due to the fact that a certain deviation amount exists in each optical axis, the deviation angle amount of each optical axis relative to a certain reference optical axis is calculated through observing, collecting and recording images engraved on the target, and the consistency of other optical axes and the other optical axes is tested.
The coaxial photoelectric reconnaissance system adopts the following steps to calibrate the optical axis:
placing a third reflector at the inlet of the Cassegrain system;
initially aligning, and adjusting the position of the multispectral comprehensive target surface to ensure that the multispectral comprehensive target surface is vertical to the optical axis of the Cassegrain system;
finishing the setting of a reference optical axis, and ensuring that the laser spot center of a laser irradiation system is superposed with the geometric center of the multispectral comprehensive target surface;
completing the consistency test of the visible light optical axis and the laser emission optical axis, closing the laser irradiation system, starting the multispectral light source, observing the coincidence of the central marking lines of the cross target on the visible light imaging system and the multispectral comprehensive target surface, and if the central marking lines are coincident, the visible light optical axis is consistent with the laser emission optical axis; if the two target surfaces do not coincide, the pixel interval of the central mark line of the cross target and the multispectral comprehensive target surface on the visible light imaging system is the deviation amount of the visible light optical axis and the laser emission optical axis;
completing the consistency test of the infrared optical axis and the laser emission optical axis, closing the laser irradiation system, starting the multispectral light source, observing the coincidence of the central marking lines of the cross target and the multispectral comprehensive target surface on the infrared imaging system, and if the central marking lines are coincident, ensuring that the visible light optical axis is consistent with the laser emission optical axis; if the two target surfaces do not coincide, the pixel interval of the central mark line of the cross target and the multispectral comprehensive target surface on the infrared imaging system is the deviation amount of the infrared optical axis and the laser emission optical axis;
and according to the deviation amount of the visible light optical axis and the laser emission optical axis and the deviation amount of the infrared optical axis and the laser emission optical axis, the consistency adjustment of the three optical axes is completed by adopting an image processing method and the positions of the fast reflection mirrors.
The multispectral comprehensive target and the multispectral lighting source are integrated into a whole in the application. The multispectral comprehensive target uses the infrared target and the visible target to share the same target plate, when the multispectral illumination light source illuminates, the infrared target is generated, and meanwhile, the visible target is generated, so that errors caused by replacement between the visible reticle and the infrared reticle are avoided, and the non-maladjustment characteristic of the laser, visible and infrared reticle is realized. The design idea adopts the most direct and simple method to detect the parallelism of the infrared and visible light axes and the laser emission axis, has low manufacturing cost and short processing period, can be used in a laboratory, can be directly installed on an armored vehicle, and can calibrate the parallelism of the three light axes at any time in an external field.
The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (5)
1. A coaxial photoelectric reconnaissance system is characterized by comprising a Cassegrain afocal coaxial two-reflection common optical path, an infrared imaging system, a visible light imaging system, a reflector, a fast reflector and a first transflective mirror;
the Cassegrain afocal coaxial two-reflection common light path comprises a primary mirror and a secondary mirror, and parallel light is emitted after light rays emitted by a target are reflected and collimated twice by the primary mirror and the secondary mirror by controlling the curvatures of the primary mirror and the secondary mirror;
the reflector is arranged on a path of parallel light emitted by the Cassegrain afocal coaxial two anti-common light paths, and the reflector realizes light conversion on the parallel light emitted by the Cassegrain afocal coaxial two anti-common light paths;
the first transflective mirror is arranged on a reflection light path of the reflector to realize the reflection of infrared light and the transmission of visible light;
the visible light imaging system is used for receiving the visible light transmitted by the first transflective lens and imaging;
the infrared imaging system is used for receiving the infrared light reflected by the first transflective mirror and imaging;
the fast reflecting mirror is arranged between the reflecting mirror and the first transflective mirror and is used for completely reflecting the reflected light of the reflecting mirror to the first transflective mirror;
the coaxial photoelectric detection system also comprises a laser irradiation system and a second transflective mirror; the second transflective lens is arranged between the first transflective lens and the visible light imaging system and positioned on a transmission light path of the first transflective lens; the laser irradiation system is used as a laser light source, and the emitted laser beam enters the Cassegrain afocal coaxial two-reflection common light path after being reflected by the second transflective lens, transmitted by the first transflective lens and reflected by the reflector and is parallel to the optical axis of the Cassegrain afocal coaxial two-reflection common light path;
the coaxial photoelectric reconnaissance system further comprises an optical axis self-calibration module and a third reflector, wherein the optical axis self-calibration module comprises an attenuation sheet, and a multispectral light source, a multispectral comprehensive target and a Cassegrain system which are sequentially arranged; the geometric center of the multispectral comprehensive target is provided with a central mark line, and the multispectral light source illuminates the multispectral comprehensive target; the Cassegrain system is used for emitting light penetrating through the multispectral comprehensive target in parallel; the third reflector is arranged between the Cassegrain system and the first transflective mirror and is used for reflecting the parallel light emitted by the Cassegrain system to the first transflective mirror.
2. The system of claim 1, wherein a switch mirror is disposed between the first transflective mirror and the infrared imaging system, the switch mirror is disposed on a reflected light path of the first transflective mirror, and the infrared imaging system receives a reflected light image of the switch mirror.
3. The system of any one of claims 1-2, wherein the multi-spectral integrated target is disposed on a multi-dimensional adjustment mechanism.
4. A coaxial photodetection system according to claim 1, characterized in that the optical axis calibration is performed by the following steps: placing a third reflector at the inlet of the Cassegrain system;
initially aligning, and adjusting the position of the multispectral comprehensive target surface to ensure that the multispectral comprehensive target surface is vertical to the optical axis of the Cassegrain system;
finishing the setting of a reference optical axis, and ensuring that the laser spot center of a laser irradiation system is superposed with the geometric center of the multispectral comprehensive target surface;
completing the consistency test of the visible light optical axis and the laser emission optical axis, closing the laser irradiation system, starting the multispectral light source, observing the coincidence of the central marking lines of the cross target on the visible light imaging system and the multispectral comprehensive target surface, and if the central marking lines are coincident, the visible light optical axis is consistent with the laser emission optical axis; if the two target surfaces do not coincide, the pixel interval of the central mark line of the cross target and the multispectral comprehensive target surface on the visible light imaging system is the deviation amount of the visible light optical axis and the laser emission optical axis;
completing the consistency test of the infrared optical axis and the laser emission optical axis, closing the laser irradiation system, starting the multispectral light source, observing the coincidence of the central marking lines of the cross target and the multispectral comprehensive target surface on the infrared imaging system, and if the central marking lines are coincident, ensuring that the visible light optical axis is consistent with the laser emission optical axis; if the two target surfaces do not coincide, the pixel interval of the central mark line of the cross target and the multispectral comprehensive target surface on the infrared imaging system is the deviation amount of the infrared optical axis and the laser emission optical axis;
and according to the deviation amount of the visible light optical axis and the laser emission optical axis and the deviation amount of the infrared optical axis and the laser emission optical axis, the consistency adjustment of the three optical axes is completed by adopting an image processing method and the positions of the fast reflection mirrors.
5. The coaxial photoelectric detection system of claim 1, further comprising an infrared medium-short focus two-stage zoom front optical module; the angle of the switching mirror is adjusted, and the infrared imaging system can receive infrared middle-short focus two-gear zooming front-mounted optical module emergent ray imaging through the switching mirror.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811094797.0A CN108957715B (en) | 2018-09-19 | 2018-09-19 | Coaxial photoelectric reconnaissance system |
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| CN201811094797.0A CN108957715B (en) | 2018-09-19 | 2018-09-19 | Coaxial photoelectric reconnaissance system |
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| CN108957715A CN108957715A (en) | 2018-12-07 |
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