CN110186562A - All band object lens of large relative aperture Dyson spectrum imaging system - Google Patents
All band object lens of large relative aperture Dyson spectrum imaging system Download PDFInfo
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- CN110186562A CN110186562A CN201910403010.2A CN201910403010A CN110186562A CN 110186562 A CN110186562 A CN 110186562A CN 201910403010 A CN201910403010 A CN 201910403010A CN 110186562 A CN110186562 A CN 110186562A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 53
- 238000001228 spectrum Methods 0.000 title claims abstract description 32
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- KPHWPUGNDIVLNH-UHFFFAOYSA-M diclofenac sodium Chemical compound [Na+].[O-]C(=O)CC1=CC=CC=C1NC1=C(Cl)C=CC=C1Cl KPHWPUGNDIVLNH-UHFFFAOYSA-M 0.000 claims abstract description 20
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- 238000002329 infrared spectrum Methods 0.000 description 4
- 238000000701 chemical imaging Methods 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/14—Generating the spectrum; Monochromators using refracting elements, e.g. prisms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
Abstract
Optical system of the present invention is applied in fields such as space flight, aviation atmospheric remote sensing, earth observations, it is related to a kind of novel Dyson spectrum imaging system of all band object lens of large relative aperture, all band imaging system is constituted using off-axis three anti-telescopes, dichronic mirror, image planes Amici prism, slit, novel Dyson spectrometer.Light energy is received using off-axis telescope, dichronic mirror light splitting, prism divide view field imaging, by slit and novel Dyson spectral composition, it can be achieved that visible near-infrared, short-wave infrared, medium-wave infrared, LONG WAVE INFRARED all band light spectrum image-forming.The off-axis three anti-telescope can realize rectangular visual field and object lens of large relative aperture imaging demand, divide view field imaging to not only increase the efficiency of light energy utilization using prism and the spectrometer of different-waveband can be made while scanning staring imaging, substantially increases satellite load and realize early warning, investigation, detection recognition efficiency.
Description
Technical field
The invention belongs to optoelectronic devices, spectral imaging technology field, are related to a kind of novel Dyson of all band object lens of large relative aperture
Spectrum imaging system.
Background technique
With spectral technique under modern security protection investigation, environmental monitoring and protection, historical relic's protection and identification, complex background army
The extensive use of thing target detection and intelligent recognition field, while higher spectral resolution both ensure that certain spectrum was fine
Degree, and the energy on each spectral coverage also has certain guarantee, therefore all band spectrometer is sent out as spectral imaging technology
The hot spot of exhibition.
In this context, all band object lens of large relative aperture of more spectrum channels and higher spectral resolution can be generated
Novel Dyson spectrometer comes into being.The novel Dyson spectrometer of all band also has qualitative while timing, positioning measurement
The function of measurement and quantitative analysis, substance detection, target identification, process prosecution, in terms of with unique excellent
Gesture makes measurement method measure spanning development from dimensional measurement to geometric attribute.And spectral imaging technology passes through spectral information
Differentiate, the upper intelligent recognition of exception that can be tieed up from spectrum goes out the military target under complex background, substantially increases optical instrument pair
The detection recognition and tracking precision of target.
The imaging band range of spectrometer concentrates in visible near-infrared range (0.4~0.9um) and main substantially at present
What is utilized is off-axis three anti-telescopic systems and offner spectrometer composition, when imaging viewing field is square visual field, it is common from
The anti-telescopic system of axis three is unable to meet demand, and offner spectrometer is also to be caused using off axis reflector system design principle
System has very big off-axis aberration that can not correct, and influences the spectral resolution of spectrometer.And traditional spectrometer is difficult to realize
Detection or identification of multiple spectrum channels to same target.
Summary of the invention
In order to solve in rectangular big visual field, off-axis three anti-telescopic system cannot receive target optical spectrum, spectrometer spectrum
The low problem of resolution ratio and solve simultaneously multiple spectrum channels to same target be difficult to real-time dispersion imaging technical problem, this
Invention provides a kind of novel Dyson spectrum imaging system of all band object lens of large relative aperture, using free form surface to off-axis telescope
The expansion of field angle is carried out, and proposes object plane-image planes separation design philosophy, Dyson spectrometer imaging system is improved
And optimization.The spectrum imaging system not only realizes the mesh of big visual field investigation detection, object lens of large relative aperture, high-resolution spectroscopy imaging
, and multiple spectral coverages may be implemented, the dispersion simultaneously of same target is imaged.
The technical solution of the invention is as follows provide all band object lens of large relative aperture Dyson spectrum imaging system, it is special it
Be in: including preposition off-axis three anti-telescopic system, dichronic mirror, first point of visual field prism, visible near-infrared Dyson spectrometer,
Short-wave infrared Dyson spectrometer, second point of visual field prism, medium-wave infrared Dyson spectrometer and LONG WAVE INFRARED Dyson spectrometer；
The preposition off-axis three anti-telescopic system includes the inclination bias entrance pupil set gradually along optical path, off-axis principal reflection
Mirror, off-axis secondary mirror and off-axis incidence, the off-axis secondary mirror are convex surface free-form surface mirror；
The spectral information of object target successively through inclination eccentric entrance pupil, off-axis principal reflection mirror, off-axis secondary mirror and from
Enter dichronic mirror after the reflection of three reflecting mirror of axis；Incident all band light beam is divided into two-way by the dichronic mirror, wherein the first via
Light beam includes visible-near infrared and short-wave infrared light, and the second road light beam includes medium-wave infrared light and LONG WAVE INFRARED light；
The first via light beam is incident to first point of visual field prism, and first via light beam is divided into visible by first point of visual field prism
Near infrared light and short-wave infrared light, it is seen that near infrared light and short-wave infrared light respectively enter visible near-infrared Dyson spectrometer with
The imaging of short-wave infrared Dyson spectrometer；
Second road light beam is incident to second point of visual field prism, and the second road light beam is divided into medium wave by second point of visual field prism
It is red with long wave that infrared light and LONG WAVE INFRARED light, medium-wave infrared light and LONG WAVE INFRARED light respectively enter medium-wave infrared Dyson spectrometer
Outer Dyson spectrometer imaging.
Further, the off-axis principal reflection mirror and off-axis incidence are concave surface even aspheric surface reflecting mirror.
Further, the off-axis principal reflection mirror, off-axis secondary mirror and off-axis incidence are made of SIC material.
Further, the dichronic mirror surface is coated with semi-transparent semi-reflecting film, can be to visible-near infrared and short-wave infrared light
Transmission, reflects medium wave infrared light and LONG WAVE INFRARED light；
Or can be reflected with short-wave infrared light visible-near infrared, medium wave infrared light and LONG WAVE INFRARED light are carried out saturating
It penetrates.
Further, the dichronic mirror is made of H-K9L.
Further, two reflectings surface of first point of visual field prism are coated with visible near-infrared film and the shortwave of being all-trans respectively
The infrared film that is all-trans；First point of visual field prism along meridian plane by the Polaroid face of first via light beam be divided into it is visible-near infrared with it is short
Wave infrared light two parts；
Two reflectings surface of second point of visual field prism are coated with that medium-wave infrared is all-trans film and LONG WAVE INFRARED is all-trans film respectively；
The Polaroid face of second road light beam is divided into medium-wave infrared light and LONG WAVE INFRARED light two along meridian plane by second point of visual field prism
Point.
Further, first point of visual field prism is made with second point of visual field prism of H-K9L.
Further, the visible near-infrared Dyson spectrometer, short-wave infrared Dyson spectrometer, medium-wave infrared Dyson
Spectrometer, LONG WAVE INFRARED Dyson spectrometer include the concave grating set gradually along optical path and imaging lens group.
Compared with prior art, the invention has the advantages that
1, the novel Dyson spectrum imaging system of all band object lens of large relative aperture of the invention is big with relative aperture, structure is tight
It is abnormal to have effectively eliminated Spectral line bend, color while guaranteeing that instrument realizes high s/n ratio for the advantages that gathering, is small in size, is light-weight
The problems such as change.
2, telescope secondary mirror is designed as free form surface by the present invention, increases the freedom degree of system optimization, realizes that off-axis three is anti-
The design requirement of the big visual field object lens of large relative aperture of system.
3, present invention firstly provides object plane-image planes separation design philosophy, Dyson spectrometer imaging system is improved
And optimization, solve traditional Dyson spectrometer due to compact-sized bring spatial component overlap problem.
4, the traditional Offren bring off-axis aberration of novel Dyson spectrometer effective solution of this invention is difficult school
Positive problem greatly reduces the design difficulty and resetting difficulty of spectrometer.
5, assembly technology of the present invention is simple, between each optical element spacing and relative position without specific demand, as long as
Meet packaging technology.
6, detection or identification of multiple spectrum channels to same target may be implemented in the present invention；
7, the off-axis three anti-telescope of the present invention can realize rectangular visual field and object lens of large relative aperture imaging demand, utilize prism point view
Field imaging not only increases the efficiency of light energy utilization and can make the spectrometer of different-waveband while scan staring imaging, greatly improves
Satellite load realizes early warning, investigation, detection recognition efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the novel Dyson spectrum imaging system of all band of embodiment of the present invention object lens of large relative aperture；
Fig. 2 is system aberration evaluation figure；
Appended drawing reference in figure are as follows: the preposition off-axis three anti-telescopic system of 1-, 11- tilt eccentric entrance pupil, the off-axis principal reflection of 12-
Mirror, the off-axis secondary mirror of 13-, 14- off-axis incidence；
2- dichronic mirror；
3- first divides visual field prism, and 01 is visible near-infrared coated reflection face, and 02 is short-wave infrared coated reflection face；
The visible near-infrared Dyson spectrometer of 4-, the visible near-infrared concave grating of 41-, the visible near-infrared relay imaging of 42- are saturating
Microscope group, the visible near-infrared folding mirror of 43-；5- short-wave infrared Dyson spectrometer, 51- short-wave infrared concave grating, 52- are short
The infrared relay imaging lens group of wave, 53- short-wave infrared folding mirror；
6- second divides visual field prism, and 03 is medium-wave infrared coated reflection face, and 04 is LONG WAVE INFRARED coated reflection face；
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 mirror；8- LONG WAVE INFRARED Dyson spectrometer, 81- LONG WAVE INFRARED concave grating, in 82- LONG WAVE INFRARED
After lens group, 83- LONG WAVE INFRARED folding mirror.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in detail.
Referring to Fig. 1, the novel Dyson spectrum imaging system of all band object lens of large relative aperture of the present invention is along anti-including preposition off-axis three
Telescopic system 1,2, first points of visual field prisms 3 of dichronic mirror, visible near-infrared novel Dyson spectrometer 4, short-wave infrared are novel
5, second points of visual field prisms 6 of Dyson spectrometer, the novel Dyson spectrometer 7 of medium-wave infrared and the novel Dyson spectrum of LONG WAVE INFRARED
Instrument 8；
Preposition off-axis three anti-telescopic system 1 is mainly the spectral information for receiving remote object target, mainly includes along light
Inclination bias entrance pupil 11, off-axis principal reflection mirror 12, off-axis secondary mirror 13 and the off-axis incidence 14 that road is set gradually, off axis
Principal reflection mirror 12 is concave surface even aspheric surface reflecting mirror, and off-axis secondary mirror 13 is convex surface free-form surface mirror, and off-axis three is anti-
Penetrating mirror 14 is concave surface even aspheric surface reflecting mirror, and off-axis principal reflection mirror 12, off-axis secondary mirror 13 and off-axis incidence 14 are equal
It is made of SIC material.
The present embodiment dichronic mirror 2 is made of H-K9L, the spectral information that preposition off-axis three anti-telescopic system 1 is received into
Row beam splitting；Its surface is coated with one layer and transmits to visible-near infrared, short-wave infrared light, and medium wave and LONG WAVE INFRARED light carry out instead
The semi-transparent semi-reflecting film penetrated carries out color separation processing to all band light, so that visible-near infrared and short-wave infrared light penetrates dichronic mirror
2, medium-wave infrared light and LONG WAVE INFRARED light are in 2 surface reflection of dichronic mirror.Be also possible in other embodiments medium-wave infrared light and
LONG WAVE INFRARED light penetrates dichronic mirror 2, it is seen that near infrared light and short-wave infrared light are in 2 surface reflection of dichronic mirror.
First point of visual field prism 3 of the present embodiment is made of H-K9L, and surface is coated with visible near-infrared film 01 and the shortwave of being all-trans
The infrared film 02 that is all-trans, the visible-near infrared and short-wave infrared light that will transmit through dichronic mirror 2 along meridian plane are divided into two parts, a part
To be visible near-infrared, light enters visible near-infrared Dyson spectrometer 4 and carries out dispersion imaging, and another part is short-wave infrared, light
Line enters short-wave infrared Dyson spectrometer 5 and carries out dispersion imaging.
Second point of visual field prism 6 of the present embodiment is made of H-K9L, and surface (reflecting surface) is coated with medium-wave infrared and is all-trans film 03
It is all-trans film 04 with LONG WAVE INFRARED, medium-wave infrared light and LONG WAVE INFRARED light that dichronic mirror 2 reflects is divided into two parts along meridian plane, one
Part is medium-wave infrared light, and light enters medium-wave infrared Dyson spectrometer 7 and carries out dispersion imaging, and another part is LONG WAVE INFRARED,
Light enters LONG WAVE INFRARED Dyson spectrometer 8 and carries out dispersion imaging.
The visible near-infrared Dyson spectrometer 4 of the present embodiment, short-wave infrared Dyson spectrometer 5, medium-wave infrared Dyson spectrum
Instrument 7 and LONG WAVE INFRARED Dyson spectrometer 8 are made of concave grating and relay imaging lens group, and concave grating is mainly by light
Spectrum carries out dispersion, and lens group is that the light of dispersion is carried out convergence imaging.Visible-near infrared and short-wave infrared light is respectively by the
Two reflecting surfaces of one point of visual field prism 3 are reflected into slit, respectively by visible near-infrared concave grating 41 and short-wave infrared
Concave grating 51 carries out dispersion, passes through visible near-infrared relay imaging lens group 42 and short-wave infrared relay imaging lens group respectively
52 carry out convergence imaging.Medium-wave infrared light and LONG WAVE INFRARED light are reflected by two reflecting surfaces of second point of visual field prism 6 respectively
Into slit, dispersion is carried out by medium-wave infrared concave grating 71 and LONG WAVE INFRARED concave grating 81 respectively, it is red by medium wave respectively
Outer relay imaging lens group 72 carries out convergence imaging with LONG WAVE INFRARED relay lens group 82.
The principle of the present invention:
The spectral information of object target is successively by tilting eccentric entrance pupil 11, off-axis principal reflection mirror 12, off-axis secondary mirror
13 and off-axis incidence 14 reflection after enter dichronic mirror 2；Incident all band light beam is divided into two-way by dichronic mirror 2, wherein
First via light beam includes visible-near infrared and short-wave infrared light, and the second road light beam includes medium-wave infrared light and LONG WAVE INFRARED light；
First via light beam is incident to first point of visual field prism 3, first point of visual field prism 3 by first via light beam be divided into it is visible-near infrared with
Short-wave infrared light, it is seen that near infrared light and short-wave infrared light respectively enter visible near-infrared Dyson spectrometer 4 and short-wave infrared
Dyson spectrometer 5 is imaged；Second road light beam is incident to second point of visual field prism 6, and second point of visual field prism 6 is by the second road light beam
It is divided into medium-wave infrared light and LONG WAVE INFRARED light, medium-wave infrared light and LONG WAVE INFRARED light respectively enter medium-wave infrared Dyson spectrometer 7
It is imaged with LONG WAVE INFRARED Dyson spectrometer 8.
Preposition off-axis three anti-telescopic system 1 is the Shared aperture reception group of optical system of the present invention, and the Shared aperture reception group is real
The imaging demand of the big visual field of object lens of large relative aperture is showed, it is ensured that all band spectrum ideal image, assume responsibility for optical system
Off-axis aberration correction balance.
Visible near-infrared, short-wave infrared, medium-wave infrared, LONG WAVE INFRARED Dyson spectrometer are mainly to passing through concave grating
Dispersion is carried out, and brought off-axis aberration is separated to object plane-image planes by relay lens group and is corrected.
Point visual field prism carries out a light splitting point visual field to different light mainly on meridian plane and handles.It can be according to selected
The size of camera photosurface flexibly visual field is split at random.
The present invention introduces free form surface in preposition off-axis three anti-telescopic system 1, realizes and opens up to off-axis system field of view angle
The correction of exhibition and off-axis off-axis aberration, and make the structure of system more compact.
The novel Dyson spectrometer resolution effect of above-mentioned all band object lens of large relative aperture is said below by way of specific example
It is bright:
The environment temperature of optical system works is -40 DEG C~60 DEG C；
The relative aperture of preposition off-axis three anti-telescopic system is 1/2.5；
Visible near-infrared Dyson imaging spectral range is (0.4~0.9um), the light spectrum image-forming range of short-wave infrared is
The spectral region of (0.9um~2.5um), medium-wave infrared is (2.5~6.5um), the spectral region of LONG WAVE INFRARED be (6.5~
12.5um)；
The pixel dimension of visible and near infrared spectrum camera is 15um, the pixel dimension of short-wave infrared spectrum camera be 25um,
The pixel dimension of medium-wave infrared spectrum camera is 30um, the pixel dimension of LONG WAVE INFRARED spectrum camera is 30um；
Visible near-infrared spectral resolution reaches 5nm, the spectral resolution of short-wave infrared reaches 10nm, medium-wave infrared
Spectral resolution reaches 40nm, the spectral resolution of LONG WAVE INFRARED reaches 80nm.Meet international high-resolution requirement.
Claims (8)
1. all band object lens of large relative aperture Dyson spectrum imaging system, it is characterised in that: including preposition off-axis three anti-telescopic system
(1), dichronic mirror (2), first point of visual field prism (3), visible near-infrared Dyson spectrometer (4), short-wave infrared Dyson spectrometer
(5), second point of visual field prism (6), medium-wave infrared Dyson spectrometer (7) and LONG WAVE INFRARED Dyson spectrometer (8)；
The preposition off-axis three anti-telescopic system (1) includes the inclination bias entrance pupil (11) set gradually along optical path, master is anti-off axis
Mirror (12), off-axis secondary mirror (13) and off-axis incidence (14) are penetrated, the off-axis secondary mirror (13) is that convex surface is freely bent
Face reflecting mirror；
The spectral information of object target is successively by tilting eccentric entrance pupil (11), off-axis principal reflection mirror (12), off-axis secondary mirror
(13) and after the reflection of off-axis incidence (14) enter dichronic mirror (2)；The dichronic mirror (2) divides incident all band light beam
For two-way, wherein first via light beam includes visible-near infrared with short-wave infrared light, the second road light beam include medium-wave infrared light and
LONG WAVE INFRARED light；
The first via light beam is incident to first point of visual field prism (3), and first via light beam is divided by first point of visual field prism (3) can
See near infrared light and short-wave infrared light, it is seen that near infrared light and short-wave infrared light respectively enter visible near-infrared Dyson spectrometer
(4) it is imaged with short-wave infrared Dyson spectrometer (5)；
Second road light beam is incident to second point of visual field prism (6), during the second road light beam is divided by second point of visual field prism (6)
Wave infrared light and LONG WAVE INFRARED light, medium-wave infrared light and LONG WAVE INFRARED light respectively enter medium-wave infrared Dyson spectrometer (7) and length
Infrared Dyson spectrometer (8) imaging of wave.
2. all band object lens of large relative aperture Dyson spectrum imaging system according to claim 1, it is characterised in that: it is described from
Axis principal reflection mirror (12) and off-axis incidence (14) are concave surface even aspheric surface reflecting mirror.
3. all band object lens of large relative aperture Dyson spectrum imaging system according to claim 2, it is characterised in that: it is described from
Axis principal reflection mirror (12), off-axis secondary mirror (13) and off-axis incidence (14) are made of SIC material.
4. all band object lens of large relative aperture Dyson spectrum imaging system according to claim 2, it is characterised in that: described point
Look mirror (2) surface is coated with semi-transparent semi-reflecting film, can be to visible-near infrared and short-wave infrared light transmission, to medium wave infrared light and length
Wave infrared light is reflected；
Or can be reflected with short-wave infrared light visible-near infrared, medium wave infrared light and LONG WAVE INFRARED light are transmitted.
5. all band object lens of large relative aperture Dyson spectrum imaging system according to claim 4, it is characterised in that: described point
Look mirror (2) is made of H-K9L.
6. all band object lens of large relative aperture Dyson spectrum imaging system according to claim 4, it is characterised in that: described
Two reflectings surface of one point of visual field prism (3) are coated with respectively visible near-infrared is all-trans film and short-wave infrared is all-trans film；First point of view
The Polaroid face of first via light beam is divided into visible-near infrared and short-wave infrared light two parts along meridian plane by field prism (3)；
Two reflectings surface of second point of visual field prism (6) are coated with that medium-wave infrared is all-trans film and LONG WAVE INFRARED is all-trans film respectively；
The Polaroid face of second road light beam is divided into medium-wave infrared light and LONG WAVE INFRARED light two along meridian plane by second point of visual field prism (6)
Part.
7. all band object lens of large relative aperture Dyson spectrum imaging system according to claim 6, it is characterised in that: first point
Visual field prism (3) is made with second point of visual field prism (6) of H-K9L.
8. all band object lens of large relative aperture Dyson spectrum imaging system according to claim 6, it is characterised in that: it is described can
See near-infrared Dyson spectrometer (4), short-wave infrared Dyson spectrometer (5), medium-wave infrared Dyson spectrometer (7), LONG WAVE INFRARED
Dyson spectrometer (8) includes the concave grating set gradually along optical path and imaging lens group.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103671A (en) * | 2020-01-13 | 2020-05-05 | 吉林工程技术师范学院 | Beam splitting prism assembly for off-axis three-mirror optical system and operation method thereof |
| CN111929878A (en) * | 2020-07-10 | 2020-11-13 | 中国科学院西安光学精密机械研究所 | Off-axis three-mirror short-focus front objective lens system of hyperspectral imager |
| CN113566965A (en) * | 2021-05-28 | 2021-10-29 | 南京航空航天大学 | Compact type wide-spectrum polarization spectrum imaging system |
| CN113701885A (en) * | 2021-08-27 | 2021-11-26 | 长春理工大学 | Off-axis three-mirror full-spectrum-band polarization spectrum imaging detection device |
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