CN106772959A - Short-wave and long-wave infrared dual-waveband confocal-surface large-relative-aperture optical system - Google Patents
Short-wave and long-wave infrared dual-waveband confocal-surface large-relative-aperture optical system Download PDFInfo
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- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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Abstract
The invention provides a large relative aperture optical system which adopts less materials, has small volume and compact structure and can effectively eliminate chromatic aberration between wave bands and in wave bands in a dual-wave-band system. The optical system comprises a front fixed lens group, a diaphragm, a middle fixed lens group, a rear fixed lens group and a detector which are fixedly connected in sequence from an object side to a focal plane; the central axes of the front fixed lens group, the diaphragm, the middle fixed lens group and the rear fixed lens group are coaxial; the front fixed lens group has positive focal power and comprises a first positive lens, a first negative lens and a second negative lens which are coaxially and sequentially arranged on a central axis from the object side to the focal plane; the middle fixed lens group has negative focal power and comprises a second positive lens and a third negative lens which are coaxially and sequentially arranged on a central axis from the object side to the focal plane direction; the diaphragm is fixedly positioned between the third negative lens and the second positive lens; the rear fixed lens group is a third positive lens.
Description
Technical field
The present invention relates to a kind of short-wave infrared and two Optical System Designs of wave band of LONG WAVE INFRARED, and in particular to one kind is only
Using transmissive element the confocal face of common light path and comprising 0.9 μm~1.7 μm of short-wave infrared and the ripple of 8 μm of LONG WAVE INFRARED~12 μm two
The Optical System Design of section.
Background technology
Identical with visual light imaging, near infrared imaging is generally also the detection to target or background reflected radiation.But due to
The latter's wavelength is longer, is influenceed smaller by atmospheric scattering, and operating distance can be with farther, and also there is the latter more preferable smog to penetrate
Ability, allowing near infrared imaging has more preferable environmental suitability；LONG WAVE INFRARED imaging mainly radiates special to object itself
The detection levied, is the preferable wave band for detecting IR signature in specific background, meanwhile, long wave infrared region also has preferable
The penetration capacity of air, smog etc..Thus, the imaging optical system of near-infrared and long-wave band infrared double-waveband is combined with, use
Near infrared from detecting background, LONG WAVE INFRARED detection target, obtains the more information of target and background, can be effectively improved system environments
Adaptability, raising target background image contrast, confrontation infrared stealth means, realize target acquisition identification identification.In recent years, collect
Into thering is near-infrared, the two waveband focus planardetector of LONG WAVE INFRARED to continue to develop, also respective optical system design is proposed
Active demand.
Near-infrared-LONG WAVE INFRARED for using in the prior art altogether the confocal face optical system of light path be mainly transmissive system,
Reflective system and refraction-reflection type system.In the design using transmissive element, due to being related to 0.9 μm~1.7 μm and 8 μm~12
μm nearly ten times wide two wave bands, available optical material is less, and this results in the aberration and ripple between whole system wave band
Aberration in section is difficult to eliminate simultaneously；In the design using reflecting element, three trans design structures being used prior art more, though
Right reflective designs three trans design processing, debug all more difficult, and phase in the absence of aberration and the characteristic of natural athermal
It is generally large to aperture；And refraction-reflection type is designed as the compromise of above two design, benefit is that aberration is easier to correction, has the disadvantage exist
Central obscuration, and need veiling glare braking measure.In addition, the central obscuration of reflecting system can also influence emittance utilization rate.
Therefore design with the near red of smaller F numbers (F# is the inverse that F-number is entrance pupil bore and the ratio between focal length, i.e. F=f/D)
Outward-LONG WAVE INFRARED object lens of large relative aperture optical system, difficulty is larger；It is double for short-wave infrared-LONG WAVE INFRARED disclosed in some documents
Wave band object lens of large relative aperture optical system, otherwise relative aperture is smaller, otherwise system architecture is complicated.
2011, it is published in the Americana of SPIE Vol.8012 801224-1~18 page《Refractive Lens
Design for Simultaneous SWIR and LWIR Imaging》A kind of short-wave infrared is disclosed to be total to LONG WAVE INFRARED
The integrated optical system in the confocal face in aperture.The system is for diagonal line length 20mm, the non-brake method shortwave-LONG WAVE INFRARED of 25 μm of pixels
Two waveband focal plane detector, focal length 50mm, F number is 1,5 kinds of infra-red materials, 11 lens is employed altogether, and at least contain two sides
Aspherical, this results in whole optical system alignment complex process, and system transmitance is relatively low, and processing cost is higher, in addition the mirror
Head overall length reaches 240mm, and overall length is more long, is unfavorable for that the miniaturization of optical system is integrated.
2013, it is published in Optical Engineering the 6th phases of volume 56, U.S.'s text of 061308-1~11 page
Offer《Optical design of common aperture, common focal plane, multispectral
opticsformilitary applications》Disclose several shortwave-LONG WAVE INFRARED integrated light in the confocal face in aperture altogether
System.Transmission type optical system disclosed herein, in the case where focal length is 50mm, F numbers are 1.4 or 1.6, and are all at least adopted
Aspherical with three faces, some designs also use the processing such as diamond (diamond), cesium iodide (CsI), cesium bromide (CsBr)
The difficult or unstable material of physicochemical property so that whole optical system lacks engineering realizability；Another is using catadioptric
The lens design of formula structure, then in the case where focal length is 50mm, F numbers have reached 1.3.It is multispectral that although the camera lens use only two panels
ZnS lens, but each optical reflection face of camera lens, transmission plane process realization on two panels ZnS lens, and also contain graceful gold in camera lens
Mirror element, these will cause whole Folerances of Optical Elements strict, and difficulty of processing is larger, and larger central obscuration, also reduce
The efficiency of light energy utilization of whole system, largely counteracts the advantage of the small F numbers of the camera lens；In addition, also being announced in the document
A kind of three anti-optical designs, whole optical system focal length is 50mm, and F numbers are 1.9, although whole system non-stop layer blocks,
Compactedness is good, but than transmissive system still there is larger volume, and three reflectings surface are Zernike faces, also increase three anti-
System is processed and the difficulty debug.
The content of the invention
The purpose of the present invention is directed to the weak point that above-mentioned prior art is present, there is provided one kind is less using material, body
Compact, the compact conformation of product, and can effectively eliminate two waveband system medium wave it is intersegmental with wave band in aberration, especially 0.9~1.7 it is μm short
The infrared object lens of large relative aperture optical systems with 8~12 μm of LONG WAVE INFRARED two wavebands of ripple.
The confocal face object lens of large relative aperture optical system of the shortwave, LONG WAVE INFRARED two waveband, including arranged successively from thing side to focal plane
Preceding fixed microscope group, diaphragm, middle fixed microscope group, rear fixed microscope group and detector that row are connected firmly；Fixed microscope group before described, diaphragm,
The central axis coaxial of the fixed microscope group in centre and rear fixed microscope group；Fixed microscope group has positive light coke before described, is included in from thing
Coaxial the first positive lens, the first negative lens and the second negative lens being arranged in order on the central axis of side to focal plane direction；In described
Between fix microscope group there is negative focal power, including from the central axis of thing side to focal plane direction it is coaxial be arranged in order it is second just saturating
Mirror and the 3rd negative lens；The diaphragm fixed bit is between the 3rd negative lens and the second positive lens；Fixed microscope group is the after described
Three positive lens；
Define abbe number between wave bandWherein, n1.3μmIn wavelength it is the refraction at 1.3 μm for material
Rate, n10μmIn wavelength it is the refractive index at 10 μm for material；
If the confocal face object lens of large relative aperture optical system focal power of the shortwave, LONG WAVE INFRARED two waveband isPreceding fixed microscope group
Focal power isDispersion system is that abbe number is between c501, the wave band of the second negative lens 503 between the wave band of the first positive lens
During c503,C501 and c503 are satisfied the following conditional expression：
C501 ＞ 0.05；C503 ＞ 0.1；
Aberration between aberration and wave band in wave band before making it possible to effectively correct in fixed microscope group, it is ensured that the confocal face of two waveband
The chromatic aberration correction ability of optical system；
If the fixed microscope group focal power in centre is3rd negative lens focal powerWhen,WithMeet following condition
Formula：
The remaining spherical aberration of fixed microscope group, coma, the balance optical system curvature of field before making it possible to correct, remain high optical
Can, and the miniaturization of optical system can be realized；
If fixed microscope group focal power is afterwardsWhen abbe number is c201 between the wave band of the 3rd positive lens,And c201
Satisfy the following conditional expression：
C201 ＞ 0.04
Make it possible to what preceding fixed microscope group and middle fixed microscope group were produced from short infrared wave band to long wave infrared region
Aberration is corrected well between wave band, and pair is corrected well with because using aberration that taking the photograph remote type structure and producing, and
Optical system residual field curvature can effectively be corrected.
Based on above scheme, the present invention has also further made following optimization：
All lens use the lens material matched with lens barrel linear expansion coefficient, to manually or electromechanical
The mode of active controls the focusing microscope group to carry out focusing compensation.
Above-mentioned diaphragm is fixed aperture or iris diaphgram.
Optical filter is also set up between rear fixed microscope group and detector.Further, optical filter can use optical filter picture frame
Or optical filter wheel mode is installed, wherein optical filter wheel is used to manually or electronic switching possesses the optical filtering of different transmission wave bands
Piece, completes to target or the multi-spectral imaging of scene.
Fixed microscope group can allow to insert corresponding beam splitter as needed with the spacing of rear fixed microscope group in the middle of above-mentioned
Or the optical filter of different-waveband, i.e., corresponding beam splitter is inserted when that can not obtain corresponding double-waveband detector carries out broadband
Divide focal plane imaging or the optical filter corresponding to different-waveband is inserted when needing to be imaged subrane in the range of two waveband with reality
The existing confocal multiwave imaging in face.
The present invention has the advantages that compared to prior art：
, only with transmissive element, compact, compact conformation, material category is few, and transmitance is high for the present invention.It is of the present invention
Three lens group eyeglasses sum of system is only five, with preferable tolerance characteristic and can processing characteristics.
The present invention takes the photograph remote formula structure and field lens principle using in Optical System Design, for 0.9 μm~1.7 μm and 8 μm
~12 μm of two wavebands, at the position of 50mm focal lengths, when carrying out dual-waveband imaging to same scenery, without focusing, each wave band is each
The modulation transfer function of visual field can keep cut-off frequency be 251p/mm when more than 0.55.Optical system maximum ring F
Number is 1, and overall length is less than 75mm, and aberration in each wave band is eliminated simultaneously with 8 μm~12 μm double wave segment limits at 0.9 μm~1.7 μm
The aberration and between wave band.0.9 μm~1.7 μm make an optical system have two kinds of wave bands concurrently with 8 μm~12 μm two waveband optical systems
Detectivity, the miniaturization lightweight of detection means and integrated can be effectively realized, while can also mitigate optics debugging
Difficulty.
Directional light from infinity thing side is by using short infrared wave band dispersive power is weaker, long wave infrared region
First positive lens of the stronger material of strong dispersive power, convergence is incident on the first negative lens, preliminary corrections system coma, field
Song, further, convergence of rays enters to inject using in the material that short-wave infrared dispersive power is weak, LONG WAVE INFRARED dispersive power is strong
The second negative lens, aberration and aberration in wave band, and compression light beam width between the wave band before correction in fixed microscope group microscope group reduce
After organize bore；The light beam of premenstrual fixed group compression is still assembled sequentially to enter and combines what is constituted by the second positive lens and the 3rd negative lens
Middle fixed microscope group, constitutes with preceding fixed microscope group and takes the photograph remote structure, compresses optical system overall length, meanwhile, the preceding group residual spherical aberration of correction,
Coma；Light enters using strong, long in short infrared wave band dispersive power through with fixed microscope group diverging in the middle of negative refractive power
3rd positive lens of the weak material of ripple infrared band dispersive power, further the balance remaining aberration in front, the curvature of field and distortion etc.
Aberration, outgoing beam is incident in detector surface to assemble form, completes whole imaging process.
The present invention is located at the first positive lens by the way of object plane side using diaphragm, can effectively control each mirror of optical system
Piece bore, makes optical system cramped construction, compact, meanwhile, optical system image planes relative illumination can also be distributed more equal
It is even.
The present invention is combined using with the lens barrel linear expansion coefficient preferable lens material of matching, and environment temperature becomes around
Can manually or the mode of electromechanical active controls focusing microscope group to be focused during change, compensation is made because of the change of lens barrel material temperature
Into expand with heat and contract with cold caused by defocus.
In optical design configurations of the present invention, there is larger space between the fixed microscope group in centre and rear fixed microscope group, can make
Obtain when corresponding double-waveband detector can not be obtained, inserting corresponding beam splitter carries out broadband point focal plane imaging；Also can be
When needing to be imaged subrane in the range of two waveband, insertion corresponds to the optical filter of different-waveband, to realize confocal face multiband
Imaging.The present invention is applied to the purposes such as all kinds of photoelectronic collimating gondolas and capstan head, the civilian monitoring of army and police, Search/Track aiming.
Brief description of the drawings
Fig. 1 is the optical system structure schematic diagram of the embodiment of the present invention one.
In figure：1 focal plane, fixes fixed microscope group in the middle of microscope group, 3 after 2,4 diaphragms fix microscope group, 6 thing sides before 5.
Fig. 2 is that the optical system structure of the correspondence embodiment of the present invention one is illustrated in the modulation transfer function of short infrared wave band
Figure.
Fig. 3 is that the optical system structure of the correspondence embodiment of the present invention one is illustrated in the modulation transfer function of long wave infrared region
Figure.
Fig. 4 is the optical system structure schematic diagram of the embodiment of the present invention two.
In figure：1 focal plane, F optical filters fix fixed microscope group in the middle of microscope group, 3 after 2,4 diaphragms fix microscope group, 6 thing sides before 5.
Specific implementation method
The characteristics of in order to further fairly set out the technical program, specific embodiment is provided below and is mutually tied with accompanying drawing
Close, the present invention will be described, but should not be construed to limitation of the invention.
Embodiment one：
The implementation that Fig. 1 describes the confocal face object lens of large relative aperture optical system of short-wave infrared, LONG WAVE INFRARED two waveband is real
Example.In the confocal face object lens of large relative aperture optical system of short-wave infrared, LONG WAVE INFRARED described by Fig. 1, the lens arrangement is mainly wrapped
Include：Preceding fixed microscope group 5, diaphragm 4, middle fixed microscope group 3 and the rear fixed microscope group 2 for connecting firmly are arranged in order from thing side 6 to focal plane 1.
Wherein, preceding fixed microscope group 5 have positive refracting power, be three separation three-chip type structures, by using ZnS materials the first positive lens 501,
The first negative lens 502 using CdTe material and the second negative lens 503 using BaF2 materials are constituted；The fixed microscope group 3 in centre contains
Two panels lens, with negative refractive power, by the second positive lens 301 using ZnSe materials and the 3rd negative lens using CdTe material
303 combinations of pairs；Fixing microscope group 2 afterwards has positive refracting power, is one-piece construction, using using ZnSe materials.Optical system diaphragm 4
It is common with rear fixed microscope group 2, preceding fixed microscope group 5 and middle fixed microscope group 3 between preceding fixed microscope group and middle fixed microscope group
Constitute complete imaging system.
The present embodiment optical system is employed takes the photograph remote type structure and field lens principle, and altogether comprising three microscope groups, now focal length is
50mm, fixed microscope group 5, diaphragm 4, middle fixed microscope group 3 and rear fixed microscope group 2 before being arranged in order to focal plane 1 from thing side 6.It is described
It is by the preceding fixed group 5 with positive refracting power, to take the photograph group before the positive light coke in remote structure, by the first positive lens after thing side 6
501st, the first negative lens 502 and the second negative lens 503；It is fixed in the middle of being made up of the second positive lens 301 and the 3rd negative lens 302
Microscope group is group after the negative power taken the photograph in remote structure；Microscope group is fixed after optical system for one-piece construction, is whole optical system
Field lens group, be made up of the 3rd positive lens 201.
In this embodiment, the directional light of the thing side 6 from infinity is by using in short infrared wave band dispersive power
First positive lens 501 of the stronger ZnS materials of the strong dispersive power of weaker, long wave infrared region, it is negative that convergence is incident in first
On mirror 502, preliminary corrections system coma, the curvature of field, further, convergence of rays enters to inject using in short-wave infrared dispersive power
Second negative lens 503 of the BaF2 materials weak, LONG WAVE INFRARED dispersive power is strong, the wave band secondary color before correction in fixed microscope group microscope group
Difference and aberration in wave band, and compression light beam width, organize bore after reduction；The light beam of premenstrual fixed group compression is still assembled and sequentially entered
The middle fixed microscope group for constituting is combined by the second positive lens 301 and the 3rd negative lens 302, is constituted with preceding fixed microscope group and is taken the photograph remote knot
Structure, compresses optical system overall length, meanwhile, group residual spherical aberration, coma before correction；Light is through the middle fixed mirror with negative refractive power
Group diverging enters using the 3rd of the ZnSe materials that short infrared wave band dispersive power is strong, long wave infrared region dispersive power is weak
Positive lens 201, further balances the aberrations such as the remaining aberration in front, the curvature of field and distortion, and outgoing beam is incided with assembling form
The focal plane 1 of detector, completes whole imaging process.
In this embodiment, diaphragm is placed between the second negative lens 503 and the second positive lens 301, on the one hand can be controlled
Each eyeglass bore of optical system is unlikely excessive, optical system is kept compact structure, compact volume；It is negative that diaphragm is placed in second
Between the positive lens 301 of lens 503 and second, the symmetry of optical texture of the present invention is increased, be conducive to the correction of off-axis aberration；
Further, diaphragm 4 can be fixed aperture or iris diaphgram, during using iris diaphgram, can be manually or electronic
Mode adjusts optical system aperture size, to adapt to different use environments, meets different use requirements.
In this embodiment, preceding fixed microscope group 5 is about as group before the positive light coke taken the photograph in remote structure, focal length
151.78mm, is by focal length about 38.39mm, using short infrared wave band dispersive power is weaker, long wave infrared region dispersion
First positive lens 501, focal length of the stronger ZnS materials of ability is about -146.67mm, using short-wave infrared dispersive power it is strong,
First negative lens 502 and focal length of the weak CdTe material of LONG WAVE INFRARED dispersive power are about -49.64mm, using in short-wave infrared
Second negative lens 503 of the BaF2 materials that dispersive power is weak, LONG WAVE INFRARED dispersive power is strong is constituted, and undertakes the main light of system burnt
Degree, meanwhile, fixed microscope group bore in the middle of compression.Distributed by focal power so and combination of materials, it is solid before can effectively correcting
Aberration between aberration and wave band in wave band in horizontal glass group, it is ensured that the chromatic aberration correction ability of the confocal face optical system of two waveband.In addition,
First positive lens 501 uses aspherical with the second negative lens near thing side surface near focal plane side surface, for correcting optical system
System off-axis aberration.
In this embodiment, the fixed microscope group 3 in centre as group after the negative power taken the photograph in remote structure, focal length is about-
123.71mm, 24.87mm, the second positive lens 301 are about by focal length；Focal length is about -15.96mm, the using CdTe material the 3rd
Negative lens 302.Wherein, the second positive lens 301 is employed short infrared wave band dispersive power is strong, long wave infrared region dispersion energy
The weak ZnSe materials of power, assembled with preceding fixation close coma that fixed group before main correction fails in the long wave infrared region of correction and
The curvature of field, the complementation of the two also makes the optical system have less remaining monochromatic aberration；And the 3rd negative lens 302 is employed in shortwave
The CdTe material that infrared band dispersive power is strong, long wave infrared region dispersive power is weak, is mainly used in correcting the short of system residual
The infrared aberration of ripple.In the middle of described in fixed microscope group 3, the second positive lens is near object space side surface and the 3rd negative lens near image side
Surface is mainly used in spherical aberration corrector, coma using aspherical.
In this embodiment, it is one-piece construction that microscope group 2 is fixed afterwards, and focal length is about 26.02mm, using ZnSe materials.Afterwards
Fixed microscope group 2 plays a part of similar field lens near the position of image planes, can further balance the remaining aberration in front,
The aberration such as the curvature of field and distortion.
In this embodiment, it is 236 × 10 that lens barrel material uses linear expansion coefficient-7The aluminum alloy materials of/K and each mirror of composition
The material fit of group, around can manually or electronic mode controls focusing microscope group to be adjusted during variation of ambient temperature
Jiao, compensation because lens barrel material temperature change caused by expand with heat and contract with cold caused by defocus.
The optical design configurations are applied to 0.9 μm~1.7 μm and are visited with 8 μm~12 μm two waveband focal planes by this embodiment
Survey on device, pixel dimension is 20 μm of 20 μ m, catercorner length is 16mm, and pixel number is 640 × 480, and embodiment is using most
Large aperture number F#1.Wherein, F# is the inverse that F-number is entrance pupil bore and the ratio between focal length, i.e. F=f/D.
In the present embodiment, fixed group 5 is less than 75mm near the face of the side of thing side 6 to the overall length of image planes 1 in the past, and each lens are most
Heavy caliber about 56mm, focal length is 50mm, and relative aperture is the ratio between focal length and entrance pupil bore, is the inverse of F-number F#.Using light
The number of turns is F#1 to the maximum, wherein, F# is the inverse that F-number is entrance pupil bore and the ratio between focal length, i.e. F=f/D.With less body
Product, lighter weight and larger relative aperture.
Referring to Fig. 2, Fig. 3, it can be seen that optical system imaging effect of the present invention, it is possible to further show system aberration
Correction is good.
The confocal face optical system of the short-wave infrared of the present embodiment, LONG WAVE INFRARED two waveband availability industrially：For
Monitor that the pointing CCTV camera of low-light (level) environment is useful, no matter being particularly suitable for condition round the clock requires the distinct target image of offer
Gondola or capstan head camera, search and track camera and sight take aim at monitoring camera etc..
Embodiment two：
The confocal face object lens of large relative aperture optical system of shortwave, LONG WAVE INFRARED in the present embodiment meets each in above-described embodiment one
While item technical conditions, optical filter F is increased between rear fixed microscope group 2 and focal plane 1.Specific optical lens structure schematic diagram
Referring to Fig. 4.
In the present embodiment, optical filter F can be a series of optical filters for possessing different transmission wave bands, connect firmly respectively positioned at filter
On mating plate picture frame, or optical filter wheel, or other mechanisms that can ensure realize in the imaging system course of work optical filter switching, coordinate
Shortwave, long wave dual-waveband imaging component, manually or electronic switching possesses the optical filter of different transmission wave bands, complete to target
Or the multi-spectral imaging of scene.
The confocal face optical system of the short-wave infrared of the present embodiment, LONG WAVE INFRARED two waveband availability industrially：For
Need to obtain object simultaneously or many spectral coverage cameras of scene different-waveband information are useful, be particularly suitable for camouflage exposure, feature and know
Not, the requirement such as biological detection, materials classification provides police camera of civilian or army of multispectral image etc..
The embodiment description of this invention utilized above, its be intended that it is exemplary, not to protection scope of the present invention
Provide constraints.Therefore, it will be apparent to one skilled in the art that not departing from claim proposed by the invention
In the condition of scope, feature replacement or modification can be carried out to the described present invention.
Claims (6)
1. the confocal face object lens of large relative aperture optical system of a kind of shortwave, LONG WAVE INFRARED two waveband, it is characterised in that：Including from thing side
(6) preceding fixed microscope group (5), diaphragm (4), afterwards middle fixed microscope group (3), the fixed microscope group (2) for connecting firmly are arranged in order to focal plane (1)
And detector；The central axis of fixed microscope group (5), diaphragm (4), middle fixed microscope group (3) and rear fixed microscope group (2) is same before described
Axle；Fixed microscope group (5) is included in and is coaxially arranged in order from the central axis of thing side to focal plane direction with positive light coke before described
The first positive lens (501), the first negative lens (502) and the second negative lens (503)；Fixed microscope group (3) is with negative in the middle of described
Focal power, including coaxial the second positive lens (301) being arranged in order and the 3rd negative from the central axis of thing side to focal plane direction
Lens (302)；Diaphragm (4) fixed bit is between the 3rd negative lens (503) and the second positive lens (301)；It is fixed after described
Microscope group (2) is the 3rd positive lens (201)；
Define abbe number between wave bandWherein, n1.3μmIn wavelength it is the refractive index at 1.3 μm for material,
n10μmIn wavelength it is the refractive index at 10 μm for material；
If the confocal face object lens of large relative aperture optical system focal power of the shortwave, LONG WAVE INFRARED two waveband isPreceding fixed microscope group light is burnt
Spend and beWhen dispersion system is that abbe number is c503 between c501, the wave band of the second negative lens 503 between the wave band of the first positive lens,C501 and c503 are satisfied the following conditional expression：
C501 ＞ 0.05；C503 ＞ 0.1；
Aberration between aberration and wave band in wave band before making it possible to effectively correct in fixed microscope group, it is ensured that the confocal face optics of two waveband
The chromatic aberration correction ability of system；
If the fixed microscope group focal power in centre is3rd negative lens focal powerWhen,WithSatisfy the following conditional expression：
The remaining spherical aberration of fixed microscope group, coma, the balance optical system curvature of field, maintain optical property high before making it possible to correct,
And the miniaturization of optical system can be realized；
If fixed microscope group focal power is afterwardsWhen abbe number is c201 between the wave band of the 3rd positive lens,Meet with c201
Following conditional：
C201 ＞ 0.04
Make it possible to the wave band produced from short infrared wave band to long wave infrared region with middle fixed microscope group to preceding fixed microscope group
Between aberration be corrected well, and pair be corrected well with because using aberration that taking the photograph remote type structure and producing, and can have
Effect correction optical system residual field curvature.
2. the confocal face object lens of large relative aperture optical system of shortwave according to claim 1, LONG WAVE INFRARED two waveband, its feature exists
In：All lens using the lens material that matches with lens barrel linear expansion coefficient, to manually or it is electromechanical actively
Mode control the focusing microscope group to carry out focusing compensation.
3. the confocal face object lens of large relative aperture optical system of shortwave according to claim 1, LONG WAVE INFRARED two waveband, its feature exists
In：The diaphragm is fixed aperture or iris diaphgram.
4. the confocal face object lens of large relative aperture optical system of shortwave according to claim 1, LONG WAVE INFRARED two waveband, its feature exists
In：Optical filter is also set up between rear fixed microscope group and detector.
5. the confocal face object lens of large relative aperture optical system of shortwave according to claim 4, LONG WAVE INFRARED two waveband, its feature exists
In：The optical filter is installed using optical filter picture frame or optical filter wheel mode, and wherein optical filter wheel is to manually or electronic
Switching possesses the optical filter of different transmission wave bands, completes to target or the multi-spectral imaging of scene.
6. the confocal face object lens of large relative aperture optical system of shortwave according to claim 1, LONG WAVE INFRARED two waveband, its feature exists
In：Fixed microscope group can allow to insert corresponding beam splitter or difference as needed with the spacing of rear fixed microscope group in the middle of described
The optical filter of wave band, i.e., corresponding beam splitter is inserted when that can not obtain corresponding double-waveband detector carries out broadband point focal plane
It is imaged or is inserted when needing to be imaged subrane in the range of two waveband confocal to realize corresponding to the optical filter of different-waveband
The multiwave imaging in face.
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| CN108152973A (en) * | 2017-12-13 | 2018-06-12 | 北京华航无线电测量研究所 | A kind of visible ray and medium-wave infrared Shared aperture complex optics |
| CN110398832A (en) * | 2019-07-11 | 2019-11-01 | 长春理工大学 | Near-infrared and LONG WAVE INFRARED two waveband microcobjective |
| CN112882210A (en) * | 2021-02-02 | 2021-06-01 | 昆明云锗高新技术有限公司 | Non-refrigeration medium-long wave broadband confocal infrared optical system |
| CN113448067A (en) * | 2021-05-21 | 2021-09-28 | 中国科学院西安光学精密机械研究所 | Switching type zooming heat difference eliminating type long-wave infrared zoom lens |
| CN113933976A (en) * | 2021-10-25 | 2022-01-14 | 季华实验室 | Long-focus dual-waveband infrared optical system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152973A (en) * | 2017-12-13 | 2018-06-12 | 北京华航无线电测量研究所 | A kind of visible ray and medium-wave infrared Shared aperture complex optics |
| CN108152973B (en) * | 2017-12-13 | 2020-07-17 | 北京华航无线电测量研究所 | Visible light and medium wave infrared common-caliber composite optical system |
| CN110398832A (en) * | 2019-07-11 | 2019-11-01 | 长春理工大学 | Near-infrared and LONG WAVE INFRARED two waveband microcobjective |
| CN112882210A (en) * | 2021-02-02 | 2021-06-01 | 昆明云锗高新技术有限公司 | Non-refrigeration medium-long wave broadband confocal infrared optical system |
| CN112882210B (en) * | 2021-02-02 | 2022-07-29 | 昆明云锗高新技术有限公司 | Non-refrigeration medium-long wave broadband confocal infrared optical system |
| CN113448067A (en) * | 2021-05-21 | 2021-09-28 | 中国科学院西安光学精密机械研究所 | Switching type zooming heat difference eliminating type long-wave infrared zoom lens |
| CN113933976A (en) * | 2021-10-25 | 2022-01-14 | 季华实验室 | Long-focus dual-waveband infrared optical system |
| CN113933976B (en) * | 2021-10-25 | 2023-07-25 | 季华实验室 | Long-focus dual-band infrared optical system |
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