CN114035320A - Common-caliber wide-spectrum imaging system - Google Patents
Common-caliber wide-spectrum imaging system Download PDFInfo
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- CN114035320A CN114035320A CN202210018893.7A CN202210018893A CN114035320A CN 114035320 A CN114035320 A CN 114035320A CN 202210018893 A CN202210018893 A CN 202210018893A CN 114035320 A CN114035320 A CN 114035320A
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Abstract
The invention relates to the technical field of optical equipment, in particular to the technical field of spectrum acquisition, and specifically relates to a common-caliber wide-spectrum imaging system, which comprises: the main reflector, the first beam splitter, the first reflector and the second beam splitter are further provided with a one-to-four light splitting signal acquisition device and a switching type external calibration system, so that a full-spectrum common light path is realized, the system has excellent imaging quality, high transmittance, compact structure, uniform image surface illumination, good stray light and cold reflection control, reasonable and effective focusing and excellent performance of a test system. And adopt the spectral imaging system of this application, the simple optical device who needs of overall structure design is less, and hardware cost is lower, but can guarantee to separate into the light signal of multiple different wave bands with the incident light according to the wavelength, and with the light path outgoing of difference to the collection equipment of convenience difference gathers.
Description
Technical Field
The invention relates to the technical field of optical equipment, in particular to the technical field of spectrum acquisition, and specifically relates to a common-caliber wide-spectrum imaging system.
Background
The optical measurement equipment can acquire different measurement information according to the acquired optical signals of different wave bands, is particularly commonly applied in the field of aerospace at present, can only detect the optical signals of one or two wave bands by the conventional optical measurement equipment, and has a more complex structure if the optical signals of a plurality of different wave bands are required to be acquired, so that the overall structure of the detection equipment is larger, and the hardware cost is also higher. Therefore, how to reduce the number of optical devices in the hardware part while separating a plurality of optical signals of different wavebands makes the overall structure of the optical measurement device compact and the overall volume smaller, which is a technical problem to be solved urgently in the industry.
Disclosure of Invention
The application provides a wide spectral imaging system of bore altogether, its aim at when guaranteeing to gather the light signal of a plurality of different wave bands, reduce optical device as far as to make the overall structure of system compact, whole volume less.
A common aperture wide spectral imaging system comprising: the device comprises a main reflecting mirror, a first beam splitter, a first reflecting mirror and a second beam splitter;
the first beam splitter is arranged on a reflection light path of the main reflector, the first reflector is arranged on a transmission light path of the first beam splitter, and the second beam splitter is arranged on a reflection light path of the first beam splitter;
incident light is incident to the main reflecting mirror through a main light path, and is reflected by the main reflecting mirror and then converged into the first beam splitter; the first beam splitter is used for splitting incident light to obtain a medium-wavelength infrared band, a visible light and a short-wave infrared band; the medium-long wave infrared band is transmitted by the first beam splitter and then enters the first reflector along a first light path; the first reflector is used for reflecting the incident medium-long wave infrared band so as to enable the medium-long wave infrared band to be emitted along a second light path;
the visible light and the short-wave infrared light segments are reflected by the first beam splitter and then enter the second beam splitter along a third light path, and the second beam splitter is used for splitting the visible light and the short-wave infrared light segments to obtain short-wave infrared light and visible light; the short-wave infrared light is transmitted by the second beam splitter and then emitted along a fourth light path; and the visible light is reflected by the second beam splitter and then exits along a fifth light path.
In one embodiment, further comprising: a first rotating mirror and a third beam splitter;
the first rotating reflecting mirror is arranged on a reflected light path of the first reflecting mirror, and the third beam splitter is arranged on the reflected light path of the first rotating reflecting mirror;
the first rotary reflector is used for reflecting an incident medium-long wave infrared band, so that the medium-long wave infrared band is incident to the third beam splitter through a fifth light path; and the third beam splitter is used for splitting the medium-long wave infrared band to obtain a long-wave infrared band and a medium-wave infrared band.
In one embodiment, the optical system further comprises a second rotating mirror, wherein the second rotating mirror is arranged on a reflection light path of the third beam splitter; the long-wave infrared band is transmitted by the third beam splitter and then emitted out through a sixth light path; the medium wave infrared band is reflected by the third beam splitter and then enters the second rotating reflecting mirror through a seventh light path, and the second rotating reflecting mirror reflects the medium wave infrared band and then emits the medium wave infrared band through an eighth light path;
the sixth light path and the eighth light path are parallel, and the sixth light path and the eighth light path are both parallel to the main light path.
In one embodiment, the device further comprises a short wave infrared acquisition device, a long wave infrared acquisition device and a medium wave infrared acquisition device;
the short-wave infrared acquisition device is arranged on a transmission light path of the second beam splitter and is used for acquiring the short-wave infrared light; the long-wave infrared acquisition device is arranged on a transmission light path of the third beam splitter and is used for acquiring the long-wave infrared band; the medium wave infrared acquisition device is arranged on a reflection light path of the second rotary reflecting mirror and is used for acquiring the medium wave infrared band.
In one embodiment, the system further comprises a medium wave band calibration system and a long wave band calibration system;
the long wave band calibration system is arranged on the fifth light path and used for sending a long wave band calibration signal to the long wave infrared acquisition device so as to calibrate the long wave infrared acquisition device;
the first rotating reflector is rotatably arranged on a light path between the long-wave band calibration system and the third beam splitter; when the first rotary reflector is rotated to be positioned at a first position, the first rotary reflector blocks a long wave band calibration signal sent by the long wave band calibration system and reflects the medium-long wave infrared band to enter the third beam splitter; when the first rotating reflector is rotated to be positioned at the second position, the first rotating reflector blocks the medium-long wave infrared band, and meanwhile, a long-wave band calibration signal sent by the long-wave band calibration system is transmitted by the third beam splitter and then is incident to the long-wave infrared acquisition device;
the medium wave band calibration system is arranged on the eighth light path and used for sending a medium wave band calibration signal to the medium wave infrared acquisition device so as to calibrate the medium wave infrared acquisition device;
the second rotating reflector is rotatably arranged on a light path between the medium wave band calibration system and the medium wave infrared acquisition device; when the second rotating reflector is rotated to be positioned at the first position, the second rotating reflector blocks a medium wave band calibration signal sent by the medium wave band calibration system and reflects the medium wave infrared band to enter the medium wave infrared acquisition device; when the second rotary reflector is rotated to be located at the second position, the second rotary reflector blocks the medium wave infrared band, and simultaneously, a medium wave band calibration signal emitted by the medium wave band calibration system is incident to the medium wave infrared acquisition device.
In one embodiment, the device further comprises a long wave imaging mirror and a medium wave imaging mirror;
the long-wave imaging mirror is arranged on a fifth light path between the first rotating reflector and the third beam splitter and is used for imaging a long-wave band calibration signal sent by a medium-long wave infrared band and/or long-wave band calibration system reflected by the first rotating reflector;
the medium wave imaging mirror is arranged on a light path between the medium wave band calibration system and the second rotary reflecting mirror and is used for imaging a medium wave band calibration signal sent by the medium wave band calibration system.
In one embodiment, the device further comprises a third rotating reflector, a visible light color collecting device and a visible light television collecting device;
the third rotating reflector is rotatably arranged on the reflection light path of the second beam splitter; the visible light color acquisition device and the visible light television acquisition device are respectively symmetrically arranged at the left side and the right side of the third rotating reflector;
when the third rotating reflector is rotated to be located at the first position, the third rotating reflector reflects the shortwave infrared light section to enable the shortwave infrared light section to be incident to the visible light color collecting device through a ninth light path, and the visible light color collecting device is used for collecting color information in the shortwave infrared light section; when the third rotating reflector is rotated to be located at the second position, the third rotating reflector reflects the short-wave infrared light section to enable the short-wave infrared light section to be incident to the visible light television acquisition device through a tenth light path, and the visible light television acquisition device is used for acquiring television information in the short-wave infrared light section;
the ninth optical path and the tenth optical path are on the same horizontal line, but opposite in direction; and the ninth and tenth optical paths are parallel to the main optical path.
In one embodiment, further comprising: a first field lens and a second field lens;
the first field lens is arranged on a second light path between the first reflecting mirror and the first rotating reflecting mirror; the second field lens is arranged on a fifth light path between the second beam splitter and the third rotating reflecting mirror.
In one embodiment, preferably, the first light path, the third light path, and the fourth light path are all on the same horizontal line, and are all parallel to the main light path; the second light path, the fifth light path and the seventh light path are parallel, and the second light path, the fifth light path and the seventh light path are all perpendicular to the main light path.
In one embodiment, the reflecting surface of the primary reflector is an even aspheric surface, the short-wave infrared collection device is arranged on one side close to the back surface of the reflecting surface of the primary reflector, and a through hole for the short-wave infrared light to pass through is formed in the center of the primary reflector.
The common-aperture wide-spectrum imaging system according to the embodiment comprises: the device comprises a main reflecting mirror, a first beam splitter, a first reflecting mirror and a second beam splitter, wherein the first beam splitter is arranged on a reflecting light path of the main reflecting mirror, the first reflecting mirror is arranged on a transmitting light path of the first beam splitter, and the second beam splitter is arranged on a reflecting light path of the first beam splitter. Incident light is reflected by the main reflecting mirror and then is converged into the first beam splitter; the first beam splitter is used for splitting incident light to obtain a medium-wavelength infrared band, a visible light and a short-wave infrared band; the medium-long wave infrared band is transmitted by the first beam splitter and then enters the first reflector along a first light path; the first reflector is used for reflecting the incident medium-long wave infrared band so as to enable the medium-long wave infrared band to be emitted along a second light path; the visible light and the short-wave infrared light segments are reflected by the first beam splitter and then enter the second beam splitter along a third light path, and the second beam splitter is used for splitting the visible light and the short-wave infrared light segments to obtain short-wave infrared light and visible light; the short-wave infrared light is transmitted by the second beam splitter and then emitted along a fourth light path; and the visible light is reflected by the second beam splitter and then emitted along the fifth light path. Adopt the spectral imaging system of this application, the simple optical device who needs of overall structure design is less, and the hardware cost is lower, but can guarantee to separate into the light signal of multiple different wave bands with the incident light according to the wavelength, and with the light path outgoing of difference to make things convenient for different collection equipment to gather.
Drawings
Fig. 1 is a schematic structural diagram of an imaging system according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning.
In the embodiment of the invention, through multiple designs and tests, the applicant ensures that the optical signals of several required wave bands can be collected, and simultaneously, the whole arrangement of the imaging system is compact and the spatial arrangement is uniform, thereby reducing the processing and adjusting difficulty.
The first embodiment is as follows:
referring to fig. 1, the present embodiment provides a common aperture wide-spectrum imaging system, which includes: the device comprises a main reflecting mirror 1, a first beam splitter 2, a first reflecting mirror 3 and a second beam splitter 4. The first beam splitter is arranged on a reflection light path of the main reflector 1, the first reflector 3 is arranged on a transmission light path of the first beam splitter 2, and the second beam splitter 4 is arranged on a reflection light path of the first beam splitter 2.
Incident light enters the main reflecting mirror 1 through a main light path, is reflected by the main reflecting mirror 1 and then is converged into the first beam splitter 2; the first beam splitter 2 is used for splitting incident light to obtain a medium-long wave infrared band (3000-. The medium-long wave infrared band is transmitted by the first beam splitter 2 and then enters the first reflector 3 along the first light path; the first reflector 3 is used for reflecting the incident medium-long wave infrared band so as to enable the medium-long wave infrared band to exit along the second optical path. The visible light and the short-wave infrared light segment are reflected by the first beam splitter 2 and then enter the second beam splitter 4 along a third light path, and the second beam splitter 4 is used for splitting the visible light and the short-wave infrared light segment to obtain short-wave infrared light and visible light; the short-wave infrared light is transmitted by the second beam splitter 4 and then emitted along a fourth light path; the visible light is reflected by the second beam splitter 4 and then exits along the fifth light path. The spectrum imaging system has the advantages that the whole structure design is compact, optical devices needed are few, the hardware cost is low, but the incident light can be guaranteed to be separated into optical signals of various different wave bands according to the wavelength, and the light signals are emitted by different light paths, so that different collection devices can collect the light signals conveniently.
The first beam splitter 2 of the embodiment is used for separating long-wave and medium-wave infrared bands from visible light and short-wave infrared bands, the main reflector 1 converges a light path to pass through the first beam splitter 2, the long-wave and medium-wave infrared band light can be transmitted, and the visible light and short-wave infrared band light can be reflected. The reflecting surface of the main reflector 1 in this embodiment is an even aspheric surface, which ensures that the aberration correction of the final image surface of all optical path channels and the wave aberration of the center of the primary image surface of the main system are zero theoretically, and provides conditions for the inspection of the adjustment process by using the interferometer.
In one embodiment, the common aperture wide-spectrum imaging system further comprises: a first rotating mirror 5 and a third beam splitter 6. The first rotating reflector 5 is arranged on the reflection light path of the first reflector, and the third beam splitter 6 is arranged on the reflection light path of the first rotating reflector 5. The first rotating reflector 5 is used for reflecting the incident medium-long wave infrared band, so that the medium-long wave infrared band is incident to the third beam splitter through a fifth light path; the third beam splitter 6 is used for splitting the medium-long wave infrared band to obtain a long-wave infrared band and a medium-wave infrared band. The third beam splitter 6 of the present embodiment is configured to separate a long-wave infrared band from a medium-wave infrared band, and specifically, may transmit the long-wave infrared band and reflect the medium-wave infrared band.
In one embodiment, the common aperture wide spectrum imaging system further comprises a second rotating mirror 7, wherein the second rotating mirror 7 is arranged on a reflection light path of the third beam splitter 6; the long-wave infrared band is transmitted by the third beam splitter 6 and then emitted out through a sixth light path; the medium wave infrared band is reflected by the third beam splitter 6 and then enters the second rotary reflector through a seventh light path, and the second rotary reflector 7 reflects the medium wave infrared band and then emits the medium wave infrared band through an eighth light path. The sixth light path and the eighth light path of this embodiment are parallel, and the sixth light path and the eighth light path are all parallel with the main light path, make whole overall arrangement of whole optical device even and compact structure like this for the whole small of system.
In an embodiment, the common-caliber wide-spectrum imaging system further comprises a short-wave infrared acquisition device (a short-wave infrared camera performs photoelectric imaging conversion on short-wave infrared signals, the same is true below) 8, a long-wave infrared acquisition device 9 and a medium-wave infrared acquisition device 10. The short-wave infrared acquisition device 8 is arranged on a transmission light path of the second beam splitter 4, and the short-wave infrared acquisition device 8 is used for acquiring short-wave infrared light; the long-wave infrared acquisition device is arranged on a transmission light path of the third beam splitter 6 and is used for acquiring a long-wave infrared band; the medium wave infrared collection device 10 is arranged on a reflection light path of the second rotating reflector 7 and is used for collecting medium wave infrared bands. Wherein, the infrared collection system of shortwave of this embodiment mainly adopts shortwave infrared camera to carry out the photoelectric imaging conversion to shortwave infrared signal. The long-wave infrared acquisition device 9 and the medium-wave infrared acquisition device 10 also adopt corresponding infrared cameras to perform photoelectric conversion so as to acquire optical signals of corresponding wave bands.
In one embodiment, the common-aperture wide-spectrum imaging system further comprises a medium-wave band calibration system 12 and a long-wave band calibration system 11 (the calibration system emits uniform infrared band light through an imaging optical path when working through switching of a rotating mirror, and after the collection device receives the infrared band light, the collection device is calibrated and can be switched back to a normal working infrared optical path after calibration is finished); the long wave band calibration system 11 is arranged on the fifth light path, specifically on the left side of the first rotating reflector 5, the long wave band calibration system 11 is used for sending a long wave band calibration signal to the long wave infrared acquisition device 9, and a calibration module (conventional calibration software used in the calibration device) is arranged in the long wave infrared acquisition device 9 to calibrate the light path where the long wave infrared acquisition device is located, so that the accuracy of optical measurement can be ensured by self-calibrating the light path.
When the medium wave band calibration system 12 and the long wave band calibration system 11 are started to calibrate the system, the reflected medium wave infrared band and medium wave infrared band need to be blocked, and similarly, when the long wave infrared band and medium wave infrared band are collected, calibration signals sent by the medium wave band calibration system 12 and the long wave band calibration system 11 need to be blocked.
Specifically, the first rotating mirror 5 of the present embodiment is rotatably disposed on the light path between the long-wave band calibration system 11 and the third beam splitter 6; when the first rotating reflector 5 is rotated to be positioned at the first position, the first rotating reflector blocks a long wave band calibration signal sent by the long wave band calibration system 11, and simultaneously reflects a medium-long wave infrared band to enter the third beam splitter 6; when the first rotating reflector 5 is rotated to be located at the second position, the medium-long wave infrared band is blocked, and meanwhile, a long-wave band calibration signal sent by the long-wave band calibration system 11 is transmitted by the third beam splitter and then enters the long-wave infrared acquisition device.
The medium wave band calibration system 12 is disposed on the eighth light path and on the left side of the second rotating mirror 7, and the medium wave band calibration system 12 is configured to send a medium wave band calibration signal to the medium wave infrared collection device 10, so as to calibrate the light path where the medium wave infrared collection device 10 is located.
The second rotating reflector 7 is rotatably arranged on a light path between the medium wave band calibration system 12 and the medium wave infrared acquisition device 10; when the second rotating reflector 7 is rotated to be located at the first position (as shown in fig. 1), the second rotating reflector blocks the mid-wave band calibration signal sent by the mid-wave band calibration system 12, and reflects the mid-wave infrared band to enter the mid-wave infrared acquisition device 10; when the second rotating reflector 7 is rotated to be located at the second position, the middle wave infrared band reflected by the third beam splitter 6 is blocked, and a middle wave band calibration signal sent by the middle wave band calibration system is made to enter the middle wave infrared acquisition device 10 to complete light path calibration.
The rotatable arrangement of the first rotating mirror 5 and the second rotating mirror 7 of the present embodiment can be realized by matching a rotating shaft and a bearing.
In one embodiment, the common aperture wide-spectrum imaging system further comprises a long-wave imaging mirror 13 and a medium-wave imaging mirror 14; the long-wave imaging mirror 13 is arranged on a fifth light path between the first rotating reflecting mirror 5 and the third beam splitter 6, the long-wave imaging mirror 13 is used for imaging or converging a calibration light path of a long-wave band calibration signal sent by a medium-long wave infrared band or long-wave band calibration system 11 reflected by the first rotating reflecting mirror 5, and the medium-wave imaging mirror 14 is arranged on the light path between the medium-wave band calibration system 12 and the second rotating reflecting mirror 7 and is used for converging the medium-wave band calibration signal sent by the medium-wave band calibration system 12.
The long wave band calibration system 11, the long wave imaging mirror 13, the third beam splitter 6 and the long wave infrared acquisition device 9 of the embodiment together form a self-calibration light path of the long wave infrared acquisition device 9; when the second rotating reflector 7 is in a horizontal position, the medium wave band calibration system 12, the medium wave imaging mirror 14 and the medium wave infrared acquisition device 10 together form a self-calibration light path of the medium wave imaging measurement subsystem, and the self-calibration can realize the accuracy of optical measurement. In addition, in the embodiment, the long-wave band calibration system 11 and the medium-wave band calibration system 12 are arranged on the left side and are respectively located on the same light path with the long-wave infrared acquisition device 9 and the medium-wave infrared acquisition device 10, so that the installation, the positioning and the switching of the long-wave band calibration system 11 and the medium-wave band calibration system 12 are convenient, and the overall structure of the system is simplified.
In one embodiment, the common aperture wide-spectrum imaging system further comprises a third rotating mirror 15, a visible light color collection device 17, and a visible light electro-optic collection device 16. The third rotating reflector 15 is rotatably arranged on the reflection light path of the second beam splitter 4; the visible light color collecting device 17 and the visible light television collecting device 16 are symmetrically arranged on the left and right sides of the third rotating reflector 15. When the third rotating mirror 15 is rotated to be located at the first position (e.g. the dashed line position in fig. 1), the third rotating mirror 15 reflects the visible light segment so that the visible light segment is incident on the visible light color collecting device 17 via the ninth optical path, and the visible light color collecting device 17 is used for collecting the color image information in the visible light segment; when the third rotating reflector 15 is rotated to be located at the second position, the third rotating reflector 15 reflects the visible light segment so that the visible light segment is incident to the visible light TV collecting device 16 through the tenth optical path, and the visible light TV collecting device 16 is used for collecting the gray scale image information in the visible light segment. The ninth optical path and the tenth optical path are on the same horizontal line, but the directions are opposite, the light in the ninth optical path horizontally propagates to the left, and the light in the tenth optical path horizontally propagates to the right; and the ninth and tenth optical paths are both parallel to the main optical path.
The angle of the third rotating reflector 15 can be adjusted, the reflected and split visible light is selectively incident to the visible light color collecting device 17 or the visible light television collecting device 16, and the visible light color collecting device 17 and the visible light television collecting device 16 can work in time division.
In one embodiment, the common aperture wide-spectrum imaging system further comprises a first field lens 18 and a second field lens 19; the first field lens 18 is arranged on a second light path between the first reflector 3 and the first rotating reflector 5 and is used for compressing the infrared waveband imaging light beam and realizing pupil connection; the second field lens 19 is arranged on a fifth light path between the second beam splitter 4 and the third rotating reflector 15, and the second field lens 19 is used for compressing the visible light waveband imaging light beam to realize pupil connection.
Wherein, the system architecture of this embodiment is as shown in fig. 1, main reflector 1, first beam splitter 2, first reflector 3, second beam splitter 4 sets up on same horizontal reference line, use this benchmark as the principal optical axis, short wave infrared collection device 8 sets up the one side near the back of main reflector 1 plane of reflection, the central point of this main reflector 1 puts and is equipped with the through-hole 110 that is used for supplying the short wave infrared light to pass, short wave infrared collection device 8 sets up at the rightmost end, belong to typical cassegrain structure, compact structure, image plane position is reasonable, can use the aberration of interferometer quantitative control primary image plane department very conveniently simultaneously.
In the embodiment, the first light path, the third light path and the fourth light path are all on the same horizontal line and are all parallel to the main light path; the second light path, the fifth light path and the seventh light path are parallel, and the second light path, the fifth light path and the seventh light path are all perpendicular to the main light path. The visible light color acquisition device 17 and the visible light television acquisition device 16 are arranged above, and the long wave infrared acquisition device 9 and the medium wave infrared acquisition device 10 are arranged below the main light path; the medium wave band calibration system 12 and the long wave band calibration system 11 are horizontally arranged on the left side of the light path where the long wave infrared acquisition device 9 and the medium wave infrared acquisition device 10 are located.
The application provides wide spectral imaging system of bore altogether, it includes the optical acquisition device of five different wave bands, it is respectively: the system comprises a visible light color acquisition device 17 with a focal length of 2000 mm-8000 mm and capable of continuously zooming, a visible light television acquisition device 16 with a focal length of 2000mm, and a medium wave infrared acquisition device 10 with a focal length of 2000 mm; a long wave infrared acquisition device 9 with a focal length of 2000 mm; and the focal length is 2000mm short wave infrared acquisition device 8. The spectral band coverage range of the imaging system of the embodiment comprises 400 nm-12000 nm, and the caliber is 1000 mm.
The main optical system of the present embodiment adopts a five-in-one manner: the visible light measurement television, the color visible light, the short wave, the medium wave and the long wave infrared subsystems share the same main reflecting mirror 1 to collect light, and a spectrum splitting mode of 'transmitting short and reflecting long' is adopted to perform respective splitting imaging according to wave bands in a subsequent light path. The system of this application adopts the mode that cassegrain formula and newton formula combined together, wherein cassegrain formula realizes the design of shortwave infrared test subsystem, newton formula realizes the design of turning over of visible, medium wave, long wave infrared diaphragm to wide band, compact optical structure design have been realized, the primary mirror adopts even order aspheric surface face type to guarantee that the aberration of final image surface is rectified and the wave aberration is zero in the primary image surface center theory of main system, this provides the condition for using the interferometer to carry out the installation and debugging process inspection. In the aspect of stray light suppression, cold stop matching design is mainly adopted in medium and long wave light paths to realize astigmatism suppression, and a lens close to an image passing surface is controlled by a lens shape to suppress cold reflection; the lenses in all imaging light paths adopt the anti-reflection film and are added with the stray light eliminating diaphragm to realize the effective suppression of stray light.
This embodiment utilizes high optical efficiency beam split structural design, including two-step one minute four spectral signal collection system and the outer mark system of switching formula, has realized full spectral band common light path for the system of this application has good imaging quality, higher transmissivity, compact structure, and image plane illuminance is even, and stray light and cold reflection control are good, and the focusing is reasonable effective, simultaneously through test system's superior performance.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A common aperture wide spectral imaging system, comprising: the device comprises a main reflecting mirror, a first beam splitter, a first reflecting mirror and a second beam splitter;
the first beam splitter is arranged on a reflection light path of the main reflector, the first reflector is arranged on a transmission light path of the first beam splitter, and the second beam splitter is arranged on a reflection light path of the first beam splitter;
incident light is incident to the main reflecting mirror through a main light path, and is reflected by the main reflecting mirror and then converged into the first beam splitter; the first beam splitter is used for splitting incident light to obtain a medium-wavelength infrared band, a visible light and a short-wave infrared band; the medium-long wave infrared band is transmitted by the first beam splitter and then enters the first reflector along a first light path; the first reflector is used for reflecting the incident medium-long wave infrared band so as to enable the medium-long wave infrared band to be emitted along a second light path;
the visible light and the short-wave infrared light segments are reflected by the first beam splitter and then enter the second beam splitter along a third light path, and the second beam splitter is used for splitting the visible light and the short-wave infrared light segments to obtain short-wave infrared light and visible light; the short-wave infrared light is transmitted by the second beam splitter and then emitted along a fourth light path; and the visible light is reflected by the second beam splitter and then exits along a fifth light path.
2. The common aperture wide spectral imaging system of claim 1, further comprising: a first rotating mirror and a third beam splitter;
the first rotating reflecting mirror is arranged on a reflected light path of the first reflecting mirror, and the third beam splitter is arranged on the reflected light path of the first rotating reflecting mirror;
the first rotary reflector is used for reflecting an incident medium-long wave infrared band, so that the medium-long wave infrared band is incident to the third beam splitter through a fifth light path; and the third beam splitter is used for splitting the medium-long wave infrared band to obtain a long-wave infrared band and a medium-wave infrared band.
3. The common aperture wide spectrum imaging system of claim 2, further comprising a second rotating mirror disposed in a reflected light path of said third beam splitter; the long-wave infrared band is transmitted by the third beam splitter and then emitted out through a sixth light path; the medium wave infrared band is reflected by the third beam splitter and then enters the second rotating reflecting mirror through a seventh light path, and the second rotating reflecting mirror reflects the medium wave infrared band and then emits the medium wave infrared band through an eighth light path;
the sixth light path and the eighth light path are parallel, and the sixth light path and the eighth light path are both parallel to the main light path.
4. The common-aperture wide-spectrum imaging system of claim 3, further comprising a short-wave infrared collection device, a long-wave infrared collection device, a medium-wave infrared collection device;
the short-wave infrared acquisition device is arranged on a transmission light path of the second beam splitter and is used for acquiring the short-wave infrared light; the long-wave infrared acquisition device is arranged on a transmission light path of the third beam splitter and is used for acquiring the long-wave infrared band; the medium wave infrared acquisition device is arranged on a reflection light path of the second rotary reflecting mirror and is used for acquiring the medium wave infrared band.
5. The common-aperture wide-spectrum imaging system of claim 4, further comprising a mid-wavelength band calibration system and a long-wavelength band calibration system;
the long wave band calibration system is arranged on the fifth light path and used for sending a long wave band calibration signal to the long wave infrared acquisition device so as to calibrate the long wave infrared acquisition device;
the first rotating reflector is rotatably arranged on a light path between the long-wave band calibration system and the third beam splitter; when the first rotary reflector is rotated to be positioned at a first position, the first rotary reflector blocks a long wave band calibration signal sent by the long wave band calibration system and reflects the medium-long wave infrared band to enter the third beam splitter; when the first rotating reflector is rotated to be positioned at the second position, the first rotating reflector blocks the medium-long wave infrared band, and meanwhile, a long-wave band calibration signal sent by the long-wave band calibration system is transmitted by the third beam splitter and then is incident to the long-wave infrared acquisition device;
the medium wave band calibration system is arranged on the eighth light path and used for sending a medium wave band calibration signal to the medium wave infrared acquisition device so as to calibrate the medium wave infrared acquisition device;
the second rotating reflector is rotatably arranged on a light path between the medium wave band calibration system and the medium wave infrared acquisition device; when the second rotating reflector is rotated to be positioned at the first position, the second rotating reflector blocks a medium wave band calibration signal sent by the medium wave band calibration system and reflects the medium wave infrared band to enter the medium wave infrared acquisition device; when the second rotary reflector is rotated to be located at the second position, the second rotary reflector blocks the medium wave infrared band, and simultaneously, a medium wave band calibration signal emitted by the medium wave band calibration system is incident to the medium wave infrared acquisition device.
6. The common aperture wide spectrum imaging system of claim 5, further comprising a long wave imaging mirror and a medium wave imaging mirror;
the long-wave imaging mirror is arranged on a fifth light path between the first rotating reflector and the third beam splitter and is used for imaging a long-wave band calibration signal sent by a medium-long wave infrared band and/or long-wave band calibration system reflected by the first rotating reflector;
the medium wave imaging mirror is arranged on a light path between the medium wave band calibration system and the second rotary reflecting mirror and is used for imaging a medium wave band calibration signal sent by the medium wave band calibration system.
7. The common aperture wide spectrum imaging system of claim 6, further comprising a third rotating mirror, a visible color collection device, a visible light television collection device;
the third rotating reflector is rotatably arranged on the reflection light path of the second beam splitter; the visible light color acquisition device and the visible light television acquisition device are respectively symmetrically arranged at the left side and the right side of the third rotating reflector;
when the third rotating reflector is rotated to be located at the first position, the third rotating reflector reflects the shortwave infrared light section to enable the shortwave infrared light section to be incident to the visible light color collecting device through a ninth light path, and the visible light color collecting device is used for collecting color information in the shortwave infrared light section; when the third rotating reflector is rotated to be located at the second position, the third rotating reflector reflects the short-wave infrared light section to enable the short-wave infrared light section to be incident to the visible light television acquisition device through a tenth light path, and the visible light television acquisition device is used for acquiring television information in the short-wave infrared light section;
the ninth optical path and the tenth optical path are on the same horizontal line, but opposite in direction; and the ninth and tenth optical paths are parallel to the main optical path.
8. The common aperture wide spectral imaging system of claim 7, further comprising: a first field lens and a second field lens;
the first field lens is arranged on a second light path between the first reflecting mirror and the first rotating reflecting mirror; the second field lens is arranged on a fifth light path between the second beam splitter and the third rotating reflecting mirror.
9. The common aperture wide spectral imaging system of claim 3,
the first light path, the third light path and the fourth light path are all on the same horizontal line and are all parallel to the main light path; the second light path, the fifth light path and the seventh light path are parallel, and the second light path, the fifth light path and the seventh light path are all perpendicular to the main light path.
10. The common aperture wide spectral imaging system of claim 1, wherein said primary mirror has a reflecting surface with an even aspheric shape, said short wave infrared collection means is disposed on a side near a back surface of said primary mirror reflecting surface, and a through hole for passing said short wave infrared light is provided in a central position of said primary mirror.
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