CN210005114U - Full-waveband large-relative-aperture Dyson spectral imaging system - Google Patents
Full-waveband large-relative-aperture Dyson spectral imaging system Download PDFInfo
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- CN210005114U CN210005114U CN201920699880.4U CN201920699880U CN210005114U CN 210005114 U CN210005114 U CN 210005114U CN 201920699880 U CN201920699880 U CN 201920699880U CN 210005114 U CN210005114 U CN 210005114U
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Abstract
Optical system uses in fields such as space flight, aviation atmosphere remote sensing, survey to the ground, relate to kinds of big relative aperture novel Dyson spectral imaging system of full wave band, adopt off-axis three anti-telescopes, the dichroic mirror, image plane beam splitter prism, the slit, novel Dyson spectrum appearance has constituted full wave band imaging system utilize off-axis telescope to receive the light energy, the dichroic mirror beam splitter, prism divides visual field formation of image, through slit and novel Dyson spectral structure, can realize to visible near infrared, the shortwave infrared, the medium wave infrared, the infrared full wave band spectral imaging of long wave, this off-axis three anti-telescopes can realize square visual field and big relative aperture formation of image demand, utilize prism to divide visual field formation of image not only to improve the light energy utilization ratio but also can make the spectrum appearance of different wave bands scan the formation of image simultaneously, improved satellite load greatly and realized the early warning, reconnaissance.
Description
Technical Field
The utility model belongs to the technical field of photoelectric equipment, spectral imaging, a novel Dyson spectral imaging system in kinds of full-wave-band big relative aperture is related to.
Background
With the widespread application of the spectrum technology in fields of modern security and protection investigation, environmental monitoring and protection, cultural relic protection and identification and military target investigation and intelligent identification under complex backgrounds, the higher spectral resolution ensures both the spectral fineness of and the energy on each spectral band also has the guarantee of , so that the full-band spectrometer becomes a hotspot for the development of the spectral imaging technology.
In this context, a new type of full-band large relative aperture Dyson spectrometer capable of producing more spectral channels and higher spectral resolution has been developed. The novel full-waveband Dyson spectrometer has the functions of qualitative measurement and quantitative analysis while performing timing and positioning measurement, has unique advantages in aspects of material detection, target identification, process detection and control, component analysis and the like, and enables the measurement mode to be developed from geometric measurement to geometric attribute measurement. And the spectral imaging technology can intelligently identify military targets under complex backgrounds from the abnormity of spectral dimensions through the discrimination of spectral information, and greatly improves the detection, identification and tracking precision of the targets by the optical instrument.
The imaging waveband range of the existing spectrometer is basically concentrated in a visible near-infrared range (0.4-0.9 um), and the existing spectrometer mainly comprises an off-axis three-mirror telescope system and an offner spectrometer, when an imaging field is a square field, the common off-axis three-mirror telescope system cannot meet the requirement, and the offner spectrometer also adopts the design principle of an off-axis reflection system, so that the system has very large off-axis aberration which cannot be corrected, and the spectral resolution of the spectrometer is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve when square big visual field, the problem that the three anti-telescope systems of off-axis can not receive the target spectrum, spectrum appearance spectral resolution is low and solve a plurality of spectral channel simultaneously and be difficult to the real-time dispersion imaging's of targets technical problem, the utility model provides a kinds of novel Dyson spectral imaging system of big relative aperture of full wave section utilizes the free curve to carry out the expansion of angle of vision to the off-axis telescope to propose the design thought of object plane-image plane separation, improve and optimize Dyson spectrum appearance imaging system, this spectral imaging system has not only realized that the detection is listened to big visual field, big relative aperture, high resolution spectral imaging's purpose, can realize moreover that a plurality of spectral bands are to the dispersion imaging simultaneously with targets.
The utility model provides a full-wave band large relative aperture Dyson spectral imaging system, which is characterized in that the system comprises a front off-axis three-mirror telescope system, a dichroic mirror, an th sub-field prism, a visible near infrared Dyson spectrometer, a short wave infrared Dyson spectrometer, a second sub-field prism, a medium wave infrared Dyson spectrometer and a long wave infrared Dyson spectrometer;
the front off-axis three-reflector telescope system comprises an inclined eccentric entrance pupil, an off-axis main reflector, an off-axis secondary reflector and an off-axis three reflector which are sequentially arranged along a light path, wherein the off-axis secondary reflector is a convex free-form surface reflector;
the spectral information of the object target enters a dichroic mirror after being reflected by an inclined eccentric entrance pupil, an off-axis main reflector, an off-axis secondary reflector and an off-axis three reflector in sequence, wherein the dichroic mirror divides an incident full-wave-band light beam into two paths, wherein the th path of light beam comprises visible near infrared light and short wave infrared light, and the second path of light beam comprises medium wave infrared light and long wave infrared light;
the th light beam is incident to the th view-dividing prism, the th view-dividing prism divides the th light beam into visible near-infrared light and short-wave infrared light, and the visible near-infrared light and the short-wave infrared light respectively enter the visible near-infrared Dyson spectrometer and the short-wave infrared Dyson spectrometer for imaging;
and the second path of light beam is incident to a second view field splitting prism, the second view field splitting prism divides the second path of light beam into medium wave infrared light and long wave infrared light, and the medium wave infrared light and the long wave infrared light respectively enter a medium wave infrared Dyson spectrometer and a long wave infrared Dyson spectrometer for imaging.
, the off-axis primary mirror and the off-axis tertiary mirror are both concave even aspheric mirrors.
, the off-axis primary mirror, the off-axis secondary mirror and the off-axis triple mirror are all made of SIC material.
, the dichroic mirror is coated with a semi-transparent semi-reflective film which can transmit visible near infrared light and short wave infrared light and reflect the medium wave infrared light and long wave infrared light;
or can reflect visible near infrared light and short wave infrared light and transmit the medium wave infrared light and long wave infrared light.
, the dichroic mirror is made of H-K9L.
, the two reflecting surfaces of the visual field splitting prism are respectively plated with a visible near-infrared total reflection film and a short-wave infrared total reflection film, and the visual field splitting prism divides the times imaging surface of the path light beam into a visible near-infrared light part and a short-wave infrared light part along the meridian plane;
the two reflecting surfaces of the second view-dividing prism are respectively plated with a medium-wave infrared total reflection film and a long-wave infrared total reflection film, and the second view-dividing prism divides an times imaging surface of the second path of light beam into a medium-wave infrared light part and a long-wave infrared light part along a meridian plane.
, the field splitting prism and the second field splitting prism are both made of H-K9L.
And , wherein the visible near-infrared Dyson spectrometer, the short-wave infrared Dyson spectrometer, the medium-wave infrared Dyson spectrometer and the long-wave infrared Dyson spectrometer respectively comprise a concave grating and an imaging lens group which are sequentially arranged along a light path.
Compared with the prior art, the utility model has the advantages that:
1. the utility model discloses a novel Dyson spectral imaging system in big relative aperture of full wave band has advantages such as relative aperture is big, compact structure, small, light in weight, when guaranteeing that the instrument realizes high SNR, the effectual spectral line bending, the colour distortion scheduling problem of having eliminated.
2. The utility model discloses be free-form surface with the design of telescope secondary mirror, increase the degree of freedom of system optimization, realize the design requirement in the big relative aperture in big visual field of off-axis three-mirror system.
3. The utility model discloses provide the design thought of object plane-image plane separation for the first time, improve and optimize Dyson spectrum appearance imaging system, solved traditional Dyson spectrum appearance because compact structure and the space part that brings overlaps the problem.
4. This utility model's novel Dyson spectrum appearance is effectual has solved the problem that the off-axis aberration is difficult to be rectified that traditional Offren brought, very big reduction the design degree of difficulty and the installation degree of difficulty of spectrum appearance.
5. The utility model discloses assembly process is simple, and interval and relative position to between each optical element do not have special demand, as long as satisfy assembly process can.
6. The utility model can realize the detection or identification of a plurality of spectral channels to the same target;
7. the utility model discloses three anti-telescopes of off-axis can realize square visual field and big relative aperture formation of image demand, utilize prism to divide visual field formation of image not only to improve light energy utilization rate but also can make the spectrum appearance of different wave bands scan gaze formation of image simultaneously, have improved satellite load greatly and have realized early warning, investigation, detection recognition efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a full-band large relative aperture novel Dyson spectral imaging system according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating system aberration evaluation;
the reference numbers in the figures are: 1-a front off-axis three-reflector telescope system, 11-a tilted eccentric entrance pupil, 12-an off-axis main reflector, 13-an off-axis secondary reflector and 14-an off-axis three reflector;
2-dichroic mirror;
3- field-of-view prism, 01 is visible near-infrared coating reflection surface, and 02 is short-wave infrared coating reflection surface;
4-visible near-infrared Dyson spectrometer, 41-visible near-infrared concave grating, 42-visible near-infrared relay imaging lens group and 43-visible near-infrared folding reflector; the device comprises a 5-short wave infrared Dyson spectrometer, a 51-short wave infrared concave grating, a 52-short wave infrared relay imaging lens group and a 53-short wave infrared folding reflector;
6-a second field-of-view prism, 03 is a medium-wave infrared coating reflection surface, and 04 is a long-wave infrared coating reflection surface;
7-medium wave infrared Dyson spectrometer, 71-medium wave infrared concave grating, 72-medium wave infrared relay imaging lens group, 73-medium wave infrared folding reflector; the device comprises an 8-long-wave infrared Dyson spectrometer, an 81-long-wave infrared concave grating, an 82-long-wave infrared relay lens group and an 83-long-wave infrared folding reflector.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the full-band large relative aperture novel Dyson spectral imaging system of the present invention comprises a front off-axis three-mirror telescopic system 1, a dichroic mirror 2, an th viewing prism 3, a visible near-infrared novel Dyson spectrometer 4, a short wave infrared novel Dyson spectrometer 5, a second viewing prism 6, a medium wave infrared novel Dyson spectrometer 7, and a long wave infrared novel Dyson spectrometer 8;
the front off-axis three-mirror telescopic system 1 mainly receives spectral information of a remote object target and mainly comprises an inclined eccentric entrance pupil 11, an off-axis main reflector 12, an off-axis secondary reflector 13 and an off-axis three-reflector 14 which are sequentially arranged along a light path, wherein the off-axis main reflector 12 is a concave even aspheric reflector, the off-axis secondary reflector 13 is a convex free-form surface reflector, the off-axis three-reflector 14 is a concave even aspheric reflector, and the off-axis main reflector 12, the off-axis secondary reflector 13 and the off-axis three-reflector 14 are all made of SIC materials.
The dichroic mirror 2 of the present embodiment is made of H-K9L, splits the spectral information received by the front off-axis triple-mirror telescopic system 1, and has layers of transflective films coated on the surface thereof for transmitting visible near-infrared light and short-wave infrared light and reflecting medium-wave and long-wave infrared light, and performs color separation on the full-wave band light, so that the visible near-infrared light and short-wave infrared light pass through the dichroic mirror 2, and the medium-wave infrared light and long-wave infrared light are reflected on the surface of the dichroic mirror 2.
The th field-splitting prism 3 of this embodiment is made of H-K9L, and its surface is plated with visible near-infrared total reflection film 01 and short-wave infrared total reflection film 02, and divides the visible near-infrared light and short-wave infrared light passing through the dichroic mirror 2 into two parts along the meridian plane, wherein part is visible near-infrared light, and the light enters the visible near-infrared Dyson spectrometer 4 for dispersive imaging, and the other part is short-wave infrared light, and the light enters the short-wave infrared Dyson spectrometer 5 for dispersive imaging.
The second field-of-view prism 6 in this embodiment is made of H-K9L, the surface (reflection surface) of which is plated with a medium-wave infrared total reflection film 03 and a long-wave infrared total reflection film 04, and divides the medium-wave infrared light and the long-wave infrared light reflected by the dichroic mirror 2 into two parts along the meridian plane, wherein the part is the medium-wave infrared light, the light enters a medium-wave infrared Dyson spectrometer 7 for dispersive imaging, the other part is the long-wave infrared light, and the light enters a long-wave infrared Dyson spectrometer 8 for dispersive imaging.
The visible near-infrared Dyson spectrometer 4, the short-wave infrared Dyson spectrometer 5, the medium-wave infrared Dyson spectrometer 7 and the long-wave infrared Dyson spectrometer 8 in the embodiment are all composed of a concave grating and a relay imaging lens group, wherein the concave grating is mainly used for dispersing a spectrum, the lens group is used for converging and imaging the dispersed light, the visible near-infrared light and the short-wave infrared light are respectively reflected by two reflection surfaces of an -th field-of-view prism 3 and enter a slit, are respectively dispersed by a visible near-infrared concave grating 41 and a short-wave infrared concave grating 51 and respectively converge and image through the visible near-infrared relay imaging lens group 42 and the short-wave infrared relay imaging lens group 52, and the medium-wave infrared light and the long-wave infrared light are respectively reflected by two reflection surfaces of a second field-of-view prism 6 and enter the slit, are respectively dispersed by a medium-wave infrared concave grating 71 and a long-wave infrared relay imaging lens group 81 and respectively converge.
The principle of the utility model is as follows:
the spectral information of an object target sequentially passes through an inclined eccentric entrance pupil 11, an off-axis main reflector 12, an off-axis secondary reflector 13 and an off-axis three reflector 14 to be reflected and then enters a dichroic mirror 2, the dichroic mirror 2 divides an incident full-wave-band light beam into two paths, wherein the path of light beam comprises visible near infrared light and short-wave infrared light, the second path of light beam comprises medium-wave infrared light and long-wave infrared light, the path of light beam enters a field splitting prism 3, the field splitting prism 3 divides the path of light beam into visible near infrared light and short-wave infrared light, the visible near infrared light and the short-wave infrared light respectively enter a visible near infrared Dyson spectrometer 4 and a short-wave infrared Dyson spectrometer 5 to form an image, the second path of light beam enters a second field splitting prism 6, the second path of light beam is divided into medium-wave infrared light and long-wave infrared light by the second field splitting prism 6, and the medium-wave infrared and long-wave infrared light respectively enter a medium.
Front-located off-axis three-mirror telescope system 1 does the utility model discloses optical system's bore altogether receives the group, should bore altogether and receive the formation of image demand that the group has realized the big visual field of big relative aperture, can guarantee to the ideal formation of image of full wave band spectrum, has undertaken optical system's off-axis aberration correction balance.
The visible near-infrared, short-wave infrared, medium-wave infrared and long-wave infrared Dyson spectrometers mainly carry out dispersion on the images through the concave grating, and off-axis aberration brought by object plane-image plane separation is corrected through the relay lens group.
The view-dividing prism is mainly used for carrying out light-dividing view-dividing treatment on different light rays on a meridian plane. The field of view can be randomly and flexibly segmented according to the size of the selected photosensitive surface of the camera.
The utility model discloses introduce free-form surface at three anti telescope systems 1 of leading off-axis, realized expanding the correction with off-axis aberration to off-axis system visual field angle to make the structure of system compacter.
The resolution effect of the novel full-band large relative aperture Dyson spectrometer is described by the following specific examples:
the working environment temperature of the optical system is-40 ℃ to 60 ℃;
the relative aperture of the front off-axis three-mirror telescopic system is 1/2.5;
the visible near-infrared Dyson imaging spectral range is (0.4-0.9 um), the short-wave infrared spectral imaging range is (0.9-2.5 um), the medium-wave infrared spectral range is (2.5-6.5 um), and the long-wave infrared spectral range is (6.5-12.5 um);
the pixel size of the visible near infrared spectrum camera is 15um, the pixel size of the short wave infrared spectrum camera is 25um, the pixel size of the medium wave infrared spectrum camera is 30um, and the pixel size of the long wave infrared spectrum camera is 30 um;
the spectral resolution of visible near infrared reaches 5nm, the spectral resolution of short wave infrared reaches 10nm, the spectral resolution of medium wave infrared reaches 40nm, and the spectral resolution of long wave infrared reaches 80 nm. And international high resolution requirements are met.
Claims (8)
1. The full-waveband large-relative-aperture Dyson spectral imaging system is characterized by comprising a front off-axis three-reflection telescopic system (1), a dichroic mirror (2), an th field splitting prism (3), a visible near-infrared Dyson spectrometer (4), a short-wave infrared Dyson spectrometer (5), a second field splitting prism (6), a medium-wave infrared Dyson spectrometer (7) and a long-wave infrared Dyson spectrometer (8);
the front off-axis three-reflector telescopic system (1) comprises an inclined eccentric entrance pupil (11), an off-axis main reflector (12), an off-axis secondary reflector (13) and an off-axis three reflector (14) which are sequentially arranged along a light path, wherein the off-axis secondary reflector (13) is a convex free-form surface reflector;
spectral information of an object target enters a dichroic mirror (2) after being reflected by an inclined eccentric entrance pupil (11), an off-axis main reflector (12), an off-axis secondary reflector (13) and an off-axis three reflector (14) in sequence, wherein the dichroic mirror (2) divides an incident full-wave-band light beam into two paths, wherein the th light beam comprises visible near infrared light and short wave infrared light, and the second light beam comprises medium wave infrared light and long wave infrared light;
the th light beam is incident to the th field-splitting prism (3), the th field-splitting prism (3) splits the th light beam into visible near-infrared light and short-wave infrared light, and the visible near-infrared light and the short-wave infrared light respectively enter the visible near-infrared Dyson spectrometer (4) and the short-wave infrared Dyson spectrometer (5) for imaging;
the second light beam is incident to a second view field splitting prism (6), the second view field splitting prism (6) splits the second light beam into medium wave infrared light and long wave infrared light, and the medium wave infrared light and the long wave infrared light respectively enter a medium wave infrared Dyson spectrometer (7) and a long wave infrared Dyson spectrometer (8) for imaging.
2. The full-band large relative aperture Dyson spectral imaging system of claim 1, wherein: the off-axis main reflector (12) and the off-axis three reflectors (14) are both concave even aspheric reflectors.
3. The full-band large relative aperture Dyson spectral imaging system of claim 2, wherein: the off-axis main reflector (12), the off-axis secondary reflector (13) and the off-axis triple reflector (14) are all made of SIC materials.
4. The full-band large relative aperture Dyson spectral imaging system of claim 2, wherein: the surface of the dichroic mirror (2) is plated with a semi-transparent semi-reflective film, so that visible near infrared light and short wave infrared light can be transmitted, and medium wave infrared light and long wave infrared light can be reflected;
or can reflect visible near infrared light and short wave infrared light and transmit the medium wave infrared light and long wave infrared light.
5. The full-band large relative aperture Dyson spectral imaging system of claim 4, wherein: the dichroic mirror (2) is made of H-K9L.
6. The full-waveband large-relative-aperture Dyson spectral imaging system as claimed in claim 4, wherein two reflecting surfaces of the th sub-field prism (3) are respectively coated with a visible near-infrared full-reflection film and a short-wave infrared full-reflection film, and the th sub-field prism (3) divides a imaging surface of a th light beam into visible near-infrared light and short-wave infrared light along a meridian plane;
two reflecting surfaces of the second field-of-view prism (6) are respectively plated with a medium wave infrared total reflection film and a long wave infrared total reflection film, and the second field-of-view prism (6) divides an -time imaging surface of the second path of light beam into a medium wave infrared light part and a long wave infrared light part along a meridian plane.
7. The full-band large relative aperture Dyson spectral imaging system according to claim 6, wherein the th subfield prism (3) and the second subfield prism (6) are both made of H-K9L.
8. The full-band large relative aperture Dyson spectral imaging system of claim 6, wherein: the visible near-infrared Dyson spectrometer (4), the short-wave infrared Dyson spectrometer (5), the medium-wave infrared Dyson spectrometer (7) and the long-wave infrared Dyson spectrometer (8) respectively comprise a concave grating and an imaging lens group which are sequentially arranged along a light path.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186562A (en) * | 2019-05-15 | 2019-08-30 | 中国科学院西安光学精密机械研究所 | All band object lens of large relative aperture Dyson spectrum imaging system |
| CN113532646A (en) * | 2021-06-17 | 2021-10-22 | 北京空间机电研究所 | Full-spectrum-segment hyperspectral imaging system with high sensitivity and low distortion of static track |
-
2019
- 2019-05-15 CN CN201920699880.4U patent/CN210005114U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186562A (en) * | 2019-05-15 | 2019-08-30 | 中国科学院西安光学精密机械研究所 | All band object lens of large relative aperture Dyson spectrum imaging system |
| CN110186562B (en) * | 2019-05-15 | 2024-01-30 | 中国科学院西安光学精密机械研究所 | Full-band large-relative-aperture Dyson spectrum imaging system |
| CN113532646A (en) * | 2021-06-17 | 2021-10-22 | 北京空间机电研究所 | Full-spectrum-segment hyperspectral imaging system with high sensitivity and low distortion of static track |
| CN113532646B (en) * | 2021-06-17 | 2023-12-12 | 北京空间机电研究所 | High-sensitivity low-distortion full-spectrum hyperspectral imaging system for stationary orbit |
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