CN103995342B - A kind of near-infrared ultraphotic spectroscopic optics imaging device - Google Patents
A kind of near-infrared ultraphotic spectroscopic optics imaging device Download PDFInfo
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- CN103995342B CN103995342B CN201410205930.0A CN201410205930A CN103995342B CN 103995342 B CN103995342 B CN 103995342B CN 201410205930 A CN201410205930 A CN 201410205930A CN 103995342 B CN103995342 B CN 103995342B
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Abstract
The invention discloses and the present invention relates to a kind of near-infrared ultraphotic spectroscopic optics imaging device, including being arranged on pre-objective group in same light path, field stop, collimation lens set and near infrared band acousto-optic turnable filter, it is disposed with imaging lens group and detector in the transmission light path of the positive first-order diffraction O light after acousto-optic turnable filter diffraction, negative one order diffraction E light and the transmission light path of zero order light after acousto-optic turnable filter diffraction are provided with light barrier, described system focal, pre-objective group focal length, collimation lens set focal lengthWith imaging lens group focal lengthMeet respectively:；This device has simple in construction and lightweight advantage, can be used for the fields such as the target recognition under the complex background that reflectance spectrum is near infrared band, Anomaly target detection, camouflaged target identification.
Description
Technical field
The present invention relates to a kind of near-infrared ultraphotic spectroscopic optics imaging device, can be used for reflectance spectrum is answering of near infrared band
The fields such as target recognition under miscellaneous background, Anomaly target detection, camouflaged target identification.
Background technology
Along with the fast development of camouflage, military target is more and more less with natural background difference, visits conventional target
Survey means propose the highest requirement.Only rely on tradition single band, the information of wide spectrum investigating system offer cannot expire
The demand of foot modern military, needs, with multispectral, ultra-optical spectrum imaging system, to detect potential target, acquisition location estimation,
Objective attribute target attribute, provides accurate information for war simulation, threat analysis and aid decision etc..
Multispectral/Hyper spectral Imaging Detection Techniques can fully reflect that target is special with the spectral distribution of background each attribute
Levy, have particularly important at aspects such as the detection of low probabilistic goal, camouflaged target detection, camouflage effectiveness detection, missile guidance application
Application prospect.In photoelectric alertness, detection etc. are equipped, use multispectral/ultraphotic spectrum Detection Techniques, be conducive to disclosing target
Classification, combination and style characteristic, the interference of suppression background, improves target acquisition, the ability of identification.
According to different needs, Hyper spectral Imaging Detection Techniques can be applied in different wavelength band, at visible ray/near
Infrared band (0.4～2.5 μm), medium-wave infrared wave band (3～5 μm), long wave infrared region (8～14 μm) all can carry out imaging
Spectrum detection, wherein visible/near infrared wave band is that solar reflection optical composes district, and the reflection at this band detection earth's surface object can obtain
Soil types, water body characteristic, vegetation distribution and the information such as military equipment, army's deployment, can tell and carry on the back at green vegetation
Real goal under scape and decoy, can quickly detect the tactics Small object such as military vehicle under the background of desert.
Non-colinear acousto-optic turnable filter (Acousto-Optic TunableFilter is called for short AOTF) is as a kind of point
Optical element, is very suitable for light spectrum image-forming field.The volume that TeO2 crystal is had except having non-colinear acousto-optic crsytal is little, solid
Body structure, insensitive to vibration；Diffraction efficiency is high；Tuning range width, the outstanding acousto-optic performances such as tuning is flexibly and speed is fast are special
Outside Dian, also there is the widest bright zone scope, can be as the acousto-material used in visible ray near infrared range.TeO2 crystal
The acousto-optic turnable filter made is a kind of automatically controlled light filter, and the sound wave produced by applied radio frequency signal is anisotropic
TeO2 crystal is formed grating, selects the wavelength of diffraction light by regulation applied radio frequency, can rapid sequential or random tuning
Hyper spectral Imaging device.
At present, super spectrum optical imaging system be primarily present of both defect and deficiency:
(1) visible ray used/near-infrared AOTF operating wavelength range is 0.4～1.0 μm, for reflectance spectrum at 1.0 μ
The near infrared band target in complex environment of more than m is difficult to；
(2) float for the drift of the angle of diffraction caused due to the dispersion of crystalline material, the reduction of imaging resolution and image
The problem moved, needs the outgoing end face single wedge of interpolation or the combination of multiple wedge at AOTF to eliminate the image drift that dispersion causes
Moving, this adds the volume and weight of whole system undoubtedly.
Summary of the invention
It is an object of the invention to, overcome the problems of the prior art and deficiency, it is provided that be a kind of based on the adjustable optical filtering of acousto-optic
The near-infrared ultraphotic spectroscopic optics imaging device of device, its operating wavelength range is 0.9 μm～1.7 μm, and it is near that these Optical devices use
The diffraction light angle drift of infrared band AOTF controls within 0.01 °, improves ultraphotic spectroscopic optics imaging resolution.
The technical solution adopted for the present invention to solve the technical problems is: a kind of near-infrared ultraphotic spectroscopic optics imaging device,
Including being arranged on pre-objective group in same light path, field stop, collimation lens set and near infrared band acousto-optic turnable filter,
It is disposed with imaging lens group and detection in the transmission light path of the positive first-order diffraction O light after acousto-optic turnable filter diffraction
Device, negative one order diffraction E light and the transmission light path of zero order light after acousto-optic turnable filter diffraction are provided with light barrier, described
System focal, pre-objective group focal length, collimation lens set focal lengthWith imaging lens group focal lengthMeet respectively:
。
Described a kind of near-infrared ultraphotic spectroscopic optics imaging device, its pre-objective group includes being arranged in same light path
A piece of H-FK61 material biconvex lens, a piece of barium crown diverging meniscus lens, a piece of dense flint positive meniscus lens and a tablet weight crown are the most curved
Month lens, wherein barium crown diverging meniscus lens and dense flint positive meniscus lens composition cemented doublet.
Described a kind of near-infrared ultraphotic spectroscopic optics imaging device, its collimation lens set includes being arranged in same light path
A piece of H-ZK21 material positive meniscus lens, a piece of lanthanum flint diverging meniscus lens, a piece of H-ZF12 material biconcave lens and a piece of lanthanum
Flint biconvex lens, wherein positive meniscus lens and lanthanum flint diverging meniscus lens composition cemented doublet, biconcave lens and lanthanum flint
Biconvex lens composition cemented doublet.
Described a kind of near-infrared ultraphotic spectroscopic optics imaging device, its imaging lens group includes being arranged in same light path
A piece of H-FK61 material biconvex lens, a piece of barium crown positive meniscus lens and a piece of dense flint diverging meniscus lens and a piece of lanthanum flint are just
Meniscus lens, wherein barium crown positive meniscus lens and dense flint diverging meniscus lens composition cemented doublet.
Described a kind of near-infrared ultraphotic spectroscopic optics imaging device, the beam splitter of its acousto-optic turnable filter uses
Acousto-optic crsytal TeO2, the positive first-order diffraction O light after TeO2 diffraction is more than or equal to 5.6 ° with the angle of departure of zero order light, brilliant through acousto-optic
Positive first-order diffraction O light after body TeO2 diffraction is 3 ° along the deflection angle in incident light axis direction.
Described a kind of near-infrared ultraphotic spectroscopic optics imaging device, the incident illumination aperture of its TeO2 crystal be 10mm ×
10mm, its service band is 0.9 μm～1.7 μm, and driving frequency scope is 37MHZ～110MHZ, the spectral line width at 1.7 mum wavelengths
Degree is more than 70 less than or equal to 15nm, wave band number, and diffraction efficiency is more than or equal to 60%, and the clear aperture of described TeO2 is 10mm, burnt
Away from for-80mm, operating wavelength range is 0.9 μm～1.7 μm, and image planes a size of 1/3 inch, Pixel size is 30 μm.
Described a kind of near-infrared ultraphotic spectroscopic optics imaging device, the focal length of its pre-objective group and collimation lens set is
50mm, visual field is 4.3 °, and relative aperture is 1/5, and the focal length of described imaging lens group is 80mm, and relative aperture is 1/8.
The invention has the beneficial effects as follows: pre-objective group and collimation lens set undertake and produce the directional light injecting TeO2 crystal
The task of bundle, the aberration that light beam performance can produce impact is corrected, and chooses the optics materials such as H-ZK21, H-ZF12, H-FK61
Material realizes apochromatism problem, makes the telescopic system second order spectrum of pre-objective group and collimation lens set composition obtain reasonable
Correction, the field stop in Polaroid of pre-objective group is used for eliminating veiling glare, and acousto-optic turnable filter is by incident parallel light
In after a certain wavelength light diffraction, produce zero order light, O light and E light, the O light of diffraction is converged in image plane by imaging lens group, will
After carrying out aberration correction together with its telescopic system formed with pre-objective group and collimation lens set, make system at whole wave band model
Enclosing and have good picture element at each wavelength, due to unglazed compensating wedge part, this device has simple in construction and lightweight excellent
Point.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is that the optical system of the present invention transmits functional arrangement in full band range；
Fig. 3 be the present invention be optical system transfer function figure at 0.9 μm at wavelength；
Fig. 4 be the present invention be optical system transfer function figure at 1.3 μm at wavelength；
Fig. 5 be the present invention be optical system transfer function figure at 1.7 μm at wavelength.
The most each reference is: 1 pre-objective group, 2 field stops, 3 collimation lens set, 4 acousto-optics are adjustable
Light filter, 5 imaging lens group, 6 detectors, 7 light barriers.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Referring to figs. 1 through shown in Fig. 5, the invention discloses a kind of near-infrared ultraphotic spectroscopic optics imaging device, including being arranged on
Pre-objective group 1, field stop 2, collimation lens set 3 and the near-infrared ripple being arranged in order in same light path, according to optic path
Section acousto-optic turnable filter 4, acousto-optic turnable filter 4 is by after a certain wavelength light diffraction in directional light after preposition telescopic system collimation
Produce zero order light, positive first-order diffraction light O light and negative one order diffraction E light, the light path along O optical transport arranges multiple different bore
Diaphragm, for effectively blocking/reduce the zero order light of transmission, E light and other veiling glares enter in imaging optical path the interference to O light,
Diaphragm is arranged on the diaphragm preamble part of imaging system, in order to suppress zero order light and the impact on O light of the E light, along O optical transport
The diaphragm of multiple different bore is set on AB dotted line in light path along Fig. 1, can effectively block the zero order light of transmission, E light and veiling glare
Enter in imaging optical path, the caliber size of diaphragm only need to ensure O light in this position can unscreened by.
Being disposed with imaging lens group 5 and detector 6 in the transmission light path of O light, imaging lens group 5 will can by acousto-optic
Adjusting the O light after light filter 4 diffraction to converge on the target surface of detector 6, the transmission light path of zero order light and E light is provided with light barrier 7,
Used up by nothing remaining after diaphragm for absorbing, described system focal, pre-objective group 1 focal length, collimating lens
Organize 3 focal lengthsWith imaging lens group 5 focal lengthMeet respectivelyWith, optical filtering that described acousto-optic is adjustable
The beam splitter of device 4 uses acousto-optic crsytal TeO2, the positive first-order diffraction O light after TeO2 diffraction and the angle of departure of zero order light
More than or equal to 5.6 °, the positive first-order diffraction O light after acousto-optic crsytal TeO2 diffraction is 3 ° along the deflection angle in incident light axis direction,
The incident illumination aperture of described TeO2 crystal is 10mm × 10mm, and its service band is 0.9 μm～1.7 μm, driving frequency scope
For 37MHZ～110MHZ, the breadth of spectrum line at 1.7 mum wavelengths is less than or equal to 15nm, and wave band number is more than 70, and diffraction efficiency is more than
Equal to 60%, the clear aperture of described TeO2 is 10mm, and focal length is-80mm, and operating wavelength range is 0.9 μm～1.7 μm, image planes
A size of 1/3 inch, Pixel size is 30 μm, and the focal length of pre-objective group 1 and collimation lens set 3 is 50mm, and visual field is
4.3 °, relative aperture is 1/5, and the focal length of imaging lens group 5 is 80mm, and relative aperture is 1/8, image planes a size of 1/3 inch, as
Unit's size is 30mm.
The light sent from target to be measured is carried out Polaroid by described pre-objective group 1, and it is by three groups of four lens
Composition, including a piece of H-FK61 material biconvex lens being arranged in same light path, a piece of barium crown diverging meniscus lens, a tablet weight fire
Stone positive meniscus lens and a tablet weight crown positive meniscus lens, wherein barium crown diverging meniscus lens and the double glue of dense flint positive meniscus lens composition
Close lens, weight crown positive meniscus lens be focusing lens, it is moved toward thing side 0.9mm can to the target blur-free imaging of 5m distance,
Polaroid of pre-objective group 1 arranges field stop 2, can effectively eliminate the impact of veiling glare, in pre-objective group 1
The 4th lens i.e. undertake focusing task from the lens that image planes are nearest, for close-in target blur-free imaging, when this
When sheet lens move 0.9mm toward thing side, can be to the target blur-free imaging of 5m distance, and the focal length variations amount of whole system is less than
5%。
The light of Polaroid is collimated into directional light and incides on TeO2 crystal, by it by described collimation lens set 3
Outgoing diaphragm is arranged on TeO2 crystal aberration correction together with pre-objective group 1, and it is made up of, including setting two groups of four lens
Put the positive meniscus lens of a piece of H-ZK21 material in same light path, a piece of lanthanum flint diverging meniscus lens, a piece of H-ZF12 material
The biconcave lens of material and a piece of lanthanum flint biconvex lens, wherein positive meniscus lens and lanthanum flint diverging meniscus lens composition are double glued saturating
Mirror, biconcave lens and lanthanum flint biconvex lens composition cemented doublet, pre-objective group 1 and collimation lens set 3 form one times
Preposition telescopic system, the light that target to be measured sends is after pre-objective group 1 and collimation lens set 3 are assembled, collimated, with collimated light beam
Incide on TeO2, in order to effectively utilize the bore of acousto-optic crsytal, the aperture diaphragm of preposition telescopic system be arranged on TeO2,
Collimation lens set 3 is made to become a diaphragm front-end system.
The incident diaphragm of described imaging lens group 5 is arranged on TeO2 crystal, and diaphragm trail is 280mm, by its with
Aberration correction is carried out, it is ensured that at whole service band together with the preposition telescopic system that pre-objective group 1 forms with collimation lens set 3
Scope picture element is good, and it is made up of three groups of four lens, including the biconvex of a piece of H-FK61 material being arranged in same light path
Lens, a piece of barium crown positive meniscus lens and a piece of dense flint diverging meniscus lens and a piece of lanthanum flint positive meniscus lens, wherein barium crown
Positive meniscus lens and dense flint diverging meniscus lens composition cemented doublet, O light is converged in image plane by imaging lens group 5, for
O light, zero order light and E light being kept completely separate, the imaging lens group 5 of rear end uses diaphragm front-end system equally, its diaphragm
Trail is calculated according to diffraction dissociation angle and the deflection angle parameter of acousto-optic turnable filter 4, and described tunable optical filter 4 is adopted
Method with suppression diffraction light drift, it is not necessary to set wedge at its outgoing end face and i.e. can repair the image drift of O light, eliminate due to
The image drift that crystalline dispersion causes.
The pre-objective group 1 of apparatus of the present invention and collimation lens set 3 undertake and produce the collimated light beam injecting TeO2 crystal
Task, the aberration that light beam performance can produce impact is corrected, and chooses the optical materials such as H-ZK21, H-ZF12, H-FK61 real
Existing apochromatism problem, makes the telescopic system second order spectrum of pre-objective group 1 and collimation lens set 3 composition obtain reasonable school
Just, the field stop 2 in Polaroid of pre-objective group 1 is used for eliminating veiling glare, and acousto-optic turnable filter 4 is by incident parallel light
In after a certain wavelength light diffraction, produce zero order light, O light and E light, the O light of diffraction is converged in image plane by imaging lens group, will
After carrying out aberration correction together with its telescopic system formed with pre-objective group 1 and collimation lens set 3, make system at whole wave band
Having good picture element at scope and each wavelength, due to unglazed compensating wedge part, this device has simple in construction and lightweight
Advantage.
The principle of above-described embodiment only illustrative present invention and effect thereof, and the embodiment that part is used, for
For those of ordinary skill in the art, without departing from the concept of the premise of the invention, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.
Claims (7)
1. a near-infrared ultraphotic spectroscopic optics imaging device, it is characterised in that: include being arranged on pre-objective group in same light path
(1), field stop (2), collimation lens set (3) and near infrared band acousto-optic turnable filter (4), through acousto-optic turnable filter
(4) it is disposed with imaging lens group (5) and detector (6), through acousto-optic in the transmission light path of the positive first-order diffraction O light after diffraction
Negative one order diffraction E light and the transmission light path of zero order light after tunable optical filter (4) diffraction are provided with light barrier (7)；By front glove
The system that mirror group (1), collimation lens set (3), near infrared band acousto-optic turnable filter (4) and imaging lens group (5) are constituted is burnt
Away from f ', pre-objective group (1) focal distance f '1, collimation lens set (3) focal distance f '2With imaging lens group (5) focal distance f '3Meet respectively:
f′1/f′2=1
f′3/ f '=-1.
A kind of near-infrared ultraphotic spectroscopic optics imaging device the most according to claim 1, it is characterised in that described front glove
Mirror group (1) includes a piece of H-FK61 material biconvex lens being arranged in same light path, a piece of barium crown diverging meniscus lens, a tablet weight
Flint positive meniscus lens and a tablet weight crown positive meniscus lens, wherein barium crown diverging meniscus lens and dense flint positive meniscus lens composition are double
Balsaming lens.
A kind of near-infrared ultraphotic spectroscopic optics imaging device the most according to claim 1, it is characterised in that described collimation is saturating
Mirror group (3) include a piece of H-ZK21 material positive meniscus lens being arranged in same light path, a piece of lanthanum flint diverging meniscus lens, one
Sheet H-ZF12 material biconcave lens and a piece of lanthanum flint biconvex lens, wherein positive meniscus lens and lanthanum flint diverging meniscus lens composition
Cemented doublet, biconcave lens and lanthanum flint biconvex lens composition cemented doublet.
A kind of near-infrared ultraphotic spectroscopic optics imaging device the most according to claim 1, it is characterised in that described imaging is saturating
Mirror group (5) includes a piece of H-FK61 material biconvex lens being arranged in same light path, a piece of barium crown positive meniscus lens and a piece of
Dense flint diverging meniscus lens and a piece of lanthanum flint positive meniscus lens, wherein barium crown positive meniscus lens and dense flint diverging meniscus lens group
Become cemented doublet.
5. according to a kind of near-infrared ultraphotic spectroscopic optics imaging device described in claim 1 or 2 or 3 or 4, it is characterised in that institute
The beam splitter of the acousto-optic turnable filter (4) stated uses acousto-optic crsytal TeO2, positive first-order diffraction O after TeO2 diffraction
Light is more than or equal to 5.6 ° with the angle of departure of zero order light, and the positive first-order diffraction O light after acousto-optic crsytal TeO2 diffraction is along incident illumination light
Axial deflection angle is 3 °.
A kind of near-infrared ultraphotic spectroscopic optics imaging device the most according to claim 5, it is characterised in that described TeO2 is brilliant
The incident illumination aperture of body is 10mm × 10mm, and its service band is 0.9 μm～1.7 μm, driving frequency scope be 37MHZ～
110MHZ, the breadth of spectrum line at 1.7 mum wavelengths is less than or equal to 15nm, and wave band number is more than 70, and diffraction efficiency is more than or equal to 60%,
The clear aperture of described TeO2 is 10mm, and focal length is-80mm, and operating wavelength range is 0.9 μm～1.7 μm, image planes a size of 1/3
Inch, Pixel size is 30 μm.
A kind of near-infrared ultraphotic spectroscopic optics imaging device the most according to claim 6, it is characterised in that described pre-objective
The focal length of group (1) and collimation lens set (3) is 50mm, and visual field is 4.3 °, and relative aperture is 1/5, described imaging lens group (5)
Focal length be 80mm, relative aperture is 1/8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410205930.0A CN103995342B (en) | 2014-05-15 | A kind of near-infrared ultraphotic spectroscopic optics imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410205930.0A CN103995342B (en) | 2014-05-15 | A kind of near-infrared ultraphotic spectroscopic optics imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103995342A CN103995342A (en) | 2014-08-20 |
| CN103995342B true CN103995342B (en) | 2016-11-30 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507006A (en) * | 2011-12-20 | 2012-06-20 | 中国兵器工业第二○五研究所 | Acousto-optic tunable filter-based infrared differential hyperspectral imaging device |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507006A (en) * | 2011-12-20 | 2012-06-20 | 中国兵器工业第二○五研究所 | Acousto-optic tunable filter-based infrared differential hyperspectral imaging device |
Non-Patent Citations (1)
| Title |
|---|
| 基于超光谱成像系统的声光可调滤波技术研究;张春光;《中国博士学位论文全文数据库 信息科技辑》;20100315(第03期);第118-121页 * |
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Effective date of registration: 20230704 Address after: No. 2 Scientific Research Building, No. 717, Yangguang Avenue, Jiangxia District, Wuhan City, Hubei Province, 430223 Patentee after: Wuhan Huazhong Kuangteng Optical Technology Co.,Ltd. Address before: 430223 717 Sunshine Avenue, Jiangxia District, Wuhan, Hubei. Patentee before: NO. 717 RESEARCH INSTITUTE OF CHINA SHIPBUILDING INDUSTRY Corp. |