CN109870804A - The visible infrared imaging of the anti-Five-channel of one kind off-axis three and laser pick-off optical system - Google Patents
The visible infrared imaging of the anti-Five-channel of one kind off-axis three and laser pick-off optical system Download PDFInfo
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Abstract
The invention discloses the visible infrared imaging of the anti-Five-channel of one kind off-axis three and laser pick-off optical systems.Big 2.5 degree of * 2.5 degree scenery of visual field passes through off-axis three anti-telescopes, is divided using off-axis three anti-intermediate image positions, then realizes all band separate imaging from visible light to LONG WAVE INFRARED by two off-axis three mirrors, four color separation films and four groups of relay lens.The present invention had not only been able to achieve heavy caliber large relative aperture high-resolution imaging, but also was able to achieve wide field staring imaging, avoided moving sweep component, simple and compact for structure；Imaging band is wide, covers visible infrared and laser ranging receive capabilities and amounts to five channels, solves the problems, such as that multichannel is difficult to be laid out, it will be apparent that improve the detection performance of instrument；Optical system aperture diaphragm reaches 500mm, and medium wave and LONG WAVE INFRARED channel relative aperture are up to 1/1.1, and the real emergent pupil and Dewar cold stop location matches of design effectively inhibit influence of the background radiation to infrared imaging.
Description
Technical field
The present invention relates to spaceborne object lens of large relative aperture heavy caliber high-resolution all band imager, in particular to it is a kind of using from
The visible infrared thermoviewer form of multichannel that the anti-telescope of axis three, color separation film and relay lens group combine.
Background technique
The infrared camera of large visual field high resolution is the key that remote sensing of the earth and space astronomy system load.Big visual field is infrared
Phase function covers broad monitor area, for improving temporal resolution, shortens revisiting period, realizes that high-density observation has weight
The meaning wanted.Improve the spatial resolution of camera, it may be possible to provide the more accurate position of target, posture and geometry information.
The U.S., Japan and Europe have succeeded in sending up the more astronomical satellites for having infrared camera, such as first red
Outer astronomical satellite IRAS, the astronomical satellite AKARI of Japan's transmitting, the infrared astronomical satellite Spitzer of U.S.'s development, Europe are developed
Infrared astronomical satellite Herschel etc..
January 25 nineteen eighty-three, European Space Agency ESA transmitted first infrared astronomical satellite IRAS (Infrared in the world
Astrology Satellite), telescope is clear aperture 0.57m, the RC system of focal length 5.5m, using 12 μm, 25 μm, 60 μ
M and 100 μm totally 4 wave bands 96% celestial sphere is generally investigated with the spatial resolution of 25 " -100 ", detect 350,000
The source of infrared radiation.
On 2 21st, 2006, Japan succeeded in sending up infrared astronomical satellite AKARI (Infrared Imaging
Surveyor).Satellite is equipped with 3 infrared acquisition instruments, using 512 × 512 yuan of InSb (1.7-5.5 μm), 256 × 256 yuan of Si:
As (5.8-14.1 μm) and 256 × 256 yuan of Si:As (12.4-26.5 μm), operating temperature is about 2K.The primary optical system of satellite
It is bore 0.67m, the RC system of focal length 4.2m can carry out high spatial resolution to Celestial Objects and highly sensitive imaging is seen
It surveys.
The Spitzer Space Telescope of transmitting on August 25th, 2008 is the plan of big observatory, NASA four
The last one space astronomy satellite.The primary optical system of Spitzer is bore 0.85m, and the RC system of focal length 10.2m is equipped with
3 infrared camera, infrared spectrometer and infrared imaging photometer high IR detection instruments.Infrared camera is in 3.6-8.0 mu m waveband
Interior 4 independent wave bands, with 1.2 " resolution ratio to target shoot be imaged.
On May 14th, 2009, Europe Space Agency transmitted Herschel Space Observatory, be mainly used in it is remote
Infrared and submillimeter wave detection, this is also the maximum infrared astronomical satellite of current space medium caliber.The master of Herschel
Optical system uses bore 3.5m, the RC system of focal length 28.5m, the active set light area 9.6m of optical system2, detecting band
60-670 μm of covering.
With the progress of every the relevant technologies, the key technical indexes of infrared camera, which has, to be obviously improved, while not
The demand of infrared camera also increased accordingly, is mainly manifested in:
1, ultra-large vision field staring imaging
In target detection and detection, early warning and warning application, field angle is extremely crucial parameter.Above-mentioned optical system
The RC system for all having selected two-mirror reflection to penetrate, available fields are smaller (less than 1 °).
2, high-resolution
The limiting resolution and signal-to-noise ratio of infrared optical system are limited by optical system relative aperture, and relative aperture is got over
Greatly, then the light gathering of optical system is stronger, and biography letter value is higher at identical nyquist frequency, and resolution ratio and signal-to-noise ratio are higher.
The high-resolution demand of infrared optics observation, is exactly the demand to heavy caliber object lens of large relative aperture infrared optical system.Above-mentioned optics
The relative aperture range of system is distributed between 8.14 to 12, and relative aperture is smaller.
Be divided using off-axis three anti-intermediate image positions and be combined using two off-axis three mirrors and relay lens group
Visible infrared scheme, be not only able to achieve heavy caliber large relative aperture high-resolution imaging, but be able to achieve wide field staring at
Picture avoids moving sweep component, simple and compact for structure；Imaging band is wide, covers visible infrared and laser ranging and connects
It receives function and amounts to five channels；Medium wave and the real emergent pupil of LONG WAVE INFRARED channel design are overlapped with Dewar cold stop, are effectively inhibited
Influence of the background radiation to infrared imaging.Therefore it solves the big visual field of visible Infrared imaging cameras and object lens of large relative aperture feelings
Multichannel is difficult to the problem of being laid out under condition, realizes big visual field object lens of large relative aperture high-resolution imaging, improves detection efficient.
Summary of the invention
The visible infrared imaging of off-axis three anti-Five-channel and laser pick-off optical system are research high-resolution multichannel all-wave
Section image camera provides a kind of novel optical system form.Technical concept of the invention is using off-axis three instead as telescope
Structure type carries out wave band separation based on color separation film, and two three mirrors and respective relay lens group, which are respectively adopted, may be implemented to regard greatly
Ground object target all band is imaged in 2.5 degree * 2.5 of field degree, object lens of large relative aperture 1.1, including laser pick-off module, visual light imaging mould
Block, shortwave image-forming module, medium wave image-forming module and long wave image-forming module totally five channels.Optical system include off-axis primary mirror 1, from
Axis secondary mirror 2, the first color separation film 3, the first off-axis three mirror 4, visible light are turned back mirror 5, the second color separation film 6, visible light focal plane 7, laser
Receiving lens group 8, laser pick-off focal plane 9, the second off-axis three mirror 10, third color separation film 11, middle long wave correct lens 12, the 4th point
Color chips 13, medium wave correction lens group 14, medium wave focal plane 15, long wave correction lens group 16, long wave focal plane 17, the first shortwave are turned back mirror
18, shortwave correction lens 19, the second shortwave are turned back mirror 20, shortwave correction lens group 21, shortwave focal plane (22).Technology of the invention
Solution is as follows:
From target in the meridian plane 3.75 degree ± 1.25 degree of central vision, within the scope of sagittal surface ± 1.25 degree can
See, after off-axis primary mirror 1, the off-axis secondary mirror 2 that shortwave, medium wave and long wave imaging beam first pass through in off-axis three anti-telescopes reflect,
The separate imaging of visible light, laser wavelength and shortwave, middle long wave band, the reflection of the first color separation film 3 are carried out at the first color separation film 3
Visible light and 1064nm laser wavelength, transmission shortwave, medium wave and long wave band.First color separation film 3 reflects visible light beam, passes through
First off-axis three mirror 4 and visible light are turned back the reflection of mirror 5, carry out the separation of visible light and laser wavelength on the second color separation film 6, and the
Two color separation films 6 reflect visible transmission laser wavelength.Visible light through the second color separation film 6 reflection converge on visible light focal plane 7 at
Picture.Shortwave and middle long wave band scenery light are by the transmission of the first color separation film 3 and the second off-axis reflection of three mirror 10 convergence, then through the
Three color separation films 11 carry out shortwave and the separation of middle long wave band, and third color separation film 11 reflects medium wave and long wave band, transmit shortwave wave
Section.Middle long wave band carries out after the reflection of third color separation film 11 and middle long wave correction lens 12 transmit in the 4th color separation film 13
Medium wave and long wave band separation, the 4th color separation film 13 transmit medium-wave band and reflect long wave band.Medium-wave band passes through the 4th color separation
The transmission of piece 13 and the medium wave correction transmission convergence of lens group 14 are imaged on medium wave focal plane 15；Long wave band passes through the 4th color separation film 13
Reflection and the long wave correction transmission convergence of lens group 16 are imaged on long wave focal plane 17.Shortwave scenery light is saturating through third color separation film 11
Penetrate with the first shortwave turn back mirror 18 reflect after, by shortwave correction lens 19 transmission and the second shortwave turn back mirror 20 reflect, through short
The wave correction convergence of lens group 21 is imaged on shortwave focal plane 22.Medium wave image-forming module and long wave image-forming module are in aperture diaphragm
Relative aperture is up to 1/1.1, it can be achieved that visual field reaches 2.5 degree of Scenery Imaging under the conditions of 500mm, and before focal plane there is design at 35mm
Real emergent pupil effectively can inhibit stray radiation to influence.Shortwave image-forming module and visual light imaging module can realize aperture diaphragm
500mm, relative aperture are respectively the Scenery Imaging of 1/1.5 and 1/3 and 2.5 degree of visual field.
3.75 degree ± 0.05 degree of central vision in meridian plane from target, 1064nm wave within the scope of sagittal surface ± 0.05 degree
Long return laser beam light beam is after off-axis primary mirror 1, the off-axis secondary mirror 2 in off-axis three anti-telescopes reflect, the reflection of the first color separation film 3
Laser beam is reflected by the first off-axis three mirror 4 and visible light mirror 5 of turning back, 1064nm laser beam by the second color separation film 6 thoroughly
Off-axis three anti-positions of focal plane are mapped to, then converges to laser pick-off focal plane 9 through the collimation of laser pick-off lens group 8 and realizes aperture diaphragm
The laser ranging function of 500mm, relative aperture 1/4.
Off-axis primary mirror 1 of the present invention is metal or glass concave mirror, has six rank hyperboloid face shapes.Off-axis time
Mirror 2 is metal or convex reflecting mirror, has six rank hyperboloid face shapes.First color separation film 3 is selenizing Zinc material, reflected waveband
0.4-1.1 microns, transmit 1.15-15 microns.First off-axis three mirror 4 and the second off-axis three mirror 10 use identical eight ranks hyperboloid
Face shape is metal or glass concave mirror.Turn back mirror 5, the first shortwave of visible light turns back mirror 18 and the second shortwave is turned back mirror 20
For metal or glass planar reflecting mirror.Second color separation film 6 is quartz material, reflects visible waveband 0.4-0.9 microns, transmission laser
1-1.1 microns of wave band.Laser pick-off lens group 8 is made of four quartz lens and a ultra-narrow band quartz plate filter, is followed successively by
Biconvex lens, plane ultra-narrow band pass filter, concave-convex lens, concave-convex lens, biconvex lens.Third color separation film 11 is zinc selenide material
Material reflects medium-long wave band 2-15 microns, transmits short-wave band 1.15-1.8 microns.Middle long wave correction lens 12 are the convex of germanium material
Concavees lens, face shape are spherical surface, and anti-reflection film is plated on surface.4th color separation film 13 is germanium material, transmits medium-wave band 2-5 microns, reflection
8-15 microns of long wave band.Medium wave correction lens group 14 is made of six-element lens, is followed successively by concave-convex lens, concave-convex lens, bumps
Lens, meniscus, concave-convex lens, meniscus, material are respectively germanium, germanium, zinc selenide, zinc selenide, germanium, zinc selenide, face shape
It is spherical surface, anti-reflection film is plated on surface.Long wave correction lens group 16 be made of six-element lens, be followed successively by concave-convex lens, concave-convex lens,
Concave-convex lens, meniscus, concave-convex lens, meniscus, material are respectively germanium, germanium, zinc selenide, zinc selenide, germanium, zinc selenide,
Face shape is spherical surface, and anti-reflection film is plated on surface.Shortwave corrects the concave-convex lens that lens 19 are germanium material, and face shape is spherical surface, surface plating
Anti-reflection film.Shortwave correction lens group 21 is made of six-element lens, is followed successively by concave-convex lens, concave-convex lens, meniscus, bumps thoroughly
Mirror, concave-convex lens, meniscus, material are respectively zinc selenide, germanium, zinc selenide, germanium, germanium, zinc selenide, and face shape is spherical surface, table
Plate anti-reflection film in face.
The present invention by off-axis three it is counter there is intermediate image plane system to combine with color separation film and relay lens group, in big visual field and big
In the case of relative aperture, it will be apparent that improve the function of band detection, realize all band multi channel imaging, the characteristics of system such as
Under:
1. when the visible infrared imaging of off-axis three anti-Five-channel and laser pick-off optical system works, structure simply only there are four
Aspherical and multiple transmission spheres, system imaging are excellent and without any central obscuration.In 2.5 ° of visual field × 2.5 °, relative aperture
In the case of 1.1,55 μ rad of medium wave and LONG WAVE INFRARED spatial resolution may be implemented, channel passes letter in nyquist frequency 17lp/
It is better than 0.5 at mm；Visible waveband spatial resolution in 2.5 ° of imaging viewing field × 2.5 °, relative aperture 3 reaches 20 μ rad, channel
It passes letter and is better than 0.75 at nyquist frequency 17lp/mm；Short-wave band imaging viewing field be greater than 2.5 ° × 2.5 °, relative aperture
Spatial resolution reaches 40 μ rad when 1.5, and channel passes letter and is better than 0.6 at nyquist frequency 17lp/mm；Laser pick-off channel
In relative aperture 4,90% imaging energy is concentrated in disc of confusion 0.1mm circle for work.
2. the visible infrared imaging of off-axis three anti-Five-channel and laser pick-off optical system use off-axis three anti-intermediate image plane positions
It sets, separates wave band using color separation film and two piece of three mirror, have effectively achieved point of five visible, shortwave, medium wave and long wave channels
From layout, solve the problems, such as to be difficult to design multichannel in the case of big visual field object lens of large relative aperture.
3. the medium wave channel and long wave channel of the visible infrared imaging of off-axis three anti-Five-channel and laser pick-off optical system are burnt
Design has real emergent pupil in front, can effectively inhibit the influence of spuious background radiation in conjunction with detector cold stop.
4. the visible infrared imaging of off-axis three anti-Five-channel is widely used with laser pick-off optical system form, can apply to detect
It looks into, global mapping, geoscience, Atmospheric Survey, the moon, the visible infrared imaging of various high-resolution such as Mars or asteroid detection
Field or laser three-dimensional imaging field.
Detailed description of the invention
Fig. 1 and Fig. 2 is the visible infrared imaging of off-axis three anti-Five-channels and laser pick-off optical system light path figure, including off-axis
Primary mirror (1), off-axis secondary mirror (2), the first color separation film (3), the first off-axis three mirror (4), visible light are turned back mirror (5), the second color separation film
(6), visible light focal plane (7), laser pick-off lens group (8), laser pick-off focal plane (9), the second off-axis three mirror (10), third color separation
Piece (11), middle long wave correction lens (12), the 4th color separation film (13), medium wave correct lens group (14), medium wave focal plane (15), long wave
Correction lens group (16), long wave focal plane (17), the first shortwave is turned back, and mirror (18), shortwave correct lens (19), the second shortwave is turned back
Mirror (20), shortwave correct lens group (21), shortwave focal plane (22).
Specific embodiment
The present invention devises the visible infrared imaging of the anti-Five-channel of one kind off-axis three and laser pick-off optical system, image quality are excellent
Good, system the key technical indexes is as follows:
1. bore: aperture diaphragm 500mm；
2. visual field: 2.5 ° × 2.5 °；
3. imaging band: 0.4-0.9 μm of visible channel, 1.2-1.8 μm of short-wave band, 2-5 μm of medium-wave band, long wave wave
8-15 microns of section；Laser pick-off band of channles 1064nm；
4. relative aperture: visible spectral coverage optical system relative aperture 1/3, focal length 1500mm；Shortwave spectral coverage optical system phase
To aperture 1/1.5, focal length 750mm；Medium wave and long wave spectral coverage optical system relative aperture 1/1.1, focal length 550mm；Laser pick-off
Channel relative aperture 1/4；
5. parameter detector: 30 μm of visible-light detector Pixel size, pixel number 2K × 2K；Shortwave detector Pixel size
30 μm, pixel number 1K × 1K；Medium wave and 30 μm of long wave detector Pixel size, pixel number 1K × 1K；Laser pick-off channel detection
Device pixel 0.8mm；
6. spatial resolution: visible spectral coverage is better than 20 μ rad, and shortwave spectral coverage is better than 40 μ rad, and medium wave and long wave spectral coverage are better than
55μrad；
7. imaging performance: full filed passes letter visible spectral coverage at nyquist frequency 17lp/mm and is better than 0.75, shortwave spectral coverage
It is better than 0.5 better than 0.6, medium wave and long wave spectral coverage, the imaging energy in laser pick-off channel 90% concentrates on disc of confusion 0.1mm circle
It is interior；
8. real exit pupil position: medium wave and long wave channel reality emergent pupil are before focal plane at 35mm.
The specific design parameter of optical system is as shown in table 1:
The specific design parameter of 1 optical system of table
Claims (15)
1. a kind of visible infrared imaging of off-axis three anti-Five-channel and laser pick-off optical system, including it is laser pick-off module, visible
Light image-forming module, shortwave image-forming module, medium wave image-forming module and long wave image-forming module, optical system include off-axis primary mirror (1), from
Turn back mirror (5), the second color separation film (6), laser of axis secondary mirror (2), the first color separation film (3), the first off-axis three mirror (4), visible light connects
Receive lens group (8), laser pick-off focal plane (9), the second off-axis three mirror (10), third color separation film (11), middle long wave correction lens
(12), the 4th color separation film (13), medium wave correction lens group (14), long wave correction lens group (16), the first shortwave turn back mirror (18),
Shortwave correction lens (19), the second shortwave turn back mirror (20) and shortwave corrects lens group (21) optics component；It is characterized by:
From target in the meridian plane 3.75 degree ± 1.25 degree of central vision, within the scope of sagittal surface ± 1.25 degree it is visible,
Shortwave, medium wave and long wave imaging beam first pass through off-axis primary mirror (1) in off-axis three anti-telescopes, after off-axis secondary mirror (2) reflection,
The separate imaging of visible light, laser wavelength and shortwave, middle long wave band, the first color separation film (3) are carried out at the first color separation film (3)
Reflect visible light and 1064nm laser wavelength, transmission shortwave, medium wave and long wave band.First color separation film (3) reflects visible light light
Beam is turned back mirror (5) reflection by the first off-axis three mirror (4) and visible light, visible light and laser is carried out on the second color separation film (6)
The separation of wave band, the second color separation film (6) reflect visible transmission laser wavelength；Visible light is reflected through the second color separation film (6) to converge
It is imaged on to visible light focal plane (7)；Shortwave and middle long wave band scenery light are off-axis by the first color separation film (3) transmission and second
Three mirrors (10) reflection convergence, then shortwave and the separation of middle long wave band are carried out through third color separation film (11), third color separation film (11) is anti-
Wave and long wave band are hit, short-wave band is transmitted.Middle long wave band is saturating by third color separation film (11) reflection and the correction of middle long wave
After mirror (12) transmission, medium wave and long wave band separation are carried out in the 4th color separation film (13), the 4th color separation film (13) transmits medium wave wave
Section reflection long wave band；Medium-wave band is by the transmission of the 4th color separation film (13) and medium wave correction lens group (14) transmission convergence imaging
To on medium wave focal plane (15)；Long wave band is pooled by the reflection of the 4th color separation film (13) and long wave correction lens group (16) transmission
As arriving on long wave focal plane (17)；Mirror (18) reflection that shortwave scenery light is transmitted through third color separation film (11) and the first shortwave is turned back
Afterwards, by shortwave correction lens (19) transmission and the second shortwave turn back mirror (20) reflection, through shortwave correction lens group (21) convergence
It is imaged on shortwave focal plane (22)；Medium wave image-forming module and long wave image-forming module relative aperture under the conditions of aperture diaphragm 500mm
Up to 1/1.1, it can be achieved that visual field reaches 2.5 degree of Scenery Imaging, design has real emergent pupil at 35mm before focal plane, can effectively inhibit miscellaneous
Scattered radiation influences；Shortwave image-forming module and visual light imaging module can realize that aperture diaphragm 500mm, relative aperture are respectively 1/
1.5 and 1/3 and 2.5 degree of visual field of Scenery Imaging；
3.75 degree ± 0.05 degree of central vision in meridian plane from target, 1064nm wavelength swashs within the scope of sagittal surface ± 0.05 degree
For optical echo light beam after off-axis primary mirror (1), the off-axis secondary mirror (2) in off-axis three anti-telescopes reflect, the first color separation film (3) is anti-
Penetrate laser beam, by the first off-axis three mirror (4) and visible light turn back mirror (5) reflection, 1064nm laser beam pass through second point
Color chips (6) is transmitted to off-axis three anti-positions of focal plane, then converges to laser pick-off focal plane (9) through laser pick-off lens group (8) collimation
Realize the laser ranging function of aperture diaphragm 500mm, relative aperture 1/4.
2. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: the off-axis primary mirror (1) is metal or glass concave mirror, has six rank hyperboloid face shapes.
3. the anti-Five-channel infrared imaging of one kind off-axis three according to claim 1 and laser pick-off optical system, feature
Be: off-axis secondary mirror (2) is metal or convex reflecting mirror, has six rank hyperboloid face shapes.
4. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: first color separation film (3) is selenizing Zinc material, 0.4-1.1 microns of reflected waveband, transmits 1.15-15 microns.
5. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: off-axis three mirror (4) of described first and the second off-axis three mirror (10) use identical eight ranks hyperboloid face shape, for gold
Category or glass concave mirror.
6. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: the visible light turn back mirror (5), the first shortwave turn back mirror (18) and the second shortwave turn back mirror (20) be metal or
Glass planar reflecting mirror.
7. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: second color separation film (6) is quartz material, reflects visible waveband 0.4-0.9 microns, transmission laser wave band 1-
1.1 micron.
8. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: the laser pick-off lens group (8) is made of four quartz lens and a ultra-narrow band quartz plate filter, successively
For biconvex lens, plane ultra-narrow band pass filter, concave-convex lens, concave-convex lens, biconvex lens.
9. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: the third color separation film (11) is selenizing Zinc material, reflects medium-long wave band 2-15 microns, transmits short-wave band
1.15-1.8 micron.
10. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: middle long wave correction lens (12) is the meniscus of germanium material, and face shape is spherical surface, and anti-reflection film is plated on surface.
11. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: the 4th color separation film (13) is germanium material, transmits medium-wave band 2-5 microns, reflection long wave band 8-15 is micro-
Rice.
12. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: medium wave correction lens group (14) is made of six-element lens, is followed successively by concave-convex lens, concave-convex lens, bumps
Lens, meniscus, concave-convex lens, meniscus, material are respectively germanium, germanium, zinc selenide, zinc selenide, germanium, zinc selenide, face shape
It is spherical surface, anti-reflection film is plated on surface.
13. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: long wave correction lens group (16) is made of six-element lens, is followed successively by concave-convex lens, concave-convex lens, bumps
Lens, meniscus, concave-convex lens, meniscus, material are respectively germanium, germanium, zinc selenide, zinc selenide, germanium, zinc selenide, face shape
It is spherical surface, anti-reflection film is plated on surface.
14. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: shortwave correction lens (19) is the concave-convex lens of germanium material, and face shape is spherical surface, and anti-reflection film is plated on surface.
15. the visible infrared imaging of the anti-Five-channel of one kind off-axis three according to claim 1 and laser pick-off optical system,
Be characterized in that: shortwave correction lens group (21) is made of six-element lens, is followed successively by concave-convex lens, concave-convex lens, convex-concave
Lens, concave-convex lens, concave-convex lens, meniscus, material are respectively zinc selenide, germanium, zinc selenide, germanium, germanium, zinc selenide, face shape
It is spherical surface, anti-reflection film is plated on surface.
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