CN103207452B - Two waveband is the confocal surface imaging system of light path altogether - Google Patents
Two waveband is the confocal surface imaging system of light path altogether Download PDFInfo
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- CN103207452B CN103207452B CN201310094728.0A CN201310094728A CN103207452B CN 103207452 B CN103207452 B CN 103207452B CN 201310094728 A CN201310094728 A CN 201310094728A CN 103207452 B CN103207452 B CN 103207452B
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Abstract
The two waveband of the present invention altogether confocal surface imaging system of light path belongs to optical technical field, and object is the lens quality that solution prior art exists and volume is large, length long and parasitic light is difficult to the problems such as suppression.Comprise primary mirror, secondary mirror, relay lens group and focus planardetector; Described primary mirror, secondary mirror, relay lens group and focus planardetector are on same optical axis, the reflecting surface of described primary mirror and the reflecting surface arranged relative of described secondary mirror, described primary mirror has center pit, described relay lens group and focus planardetector are positioned at the center pit of described primary mirror, described relay lens group is between the first image planes and focus planardetector, and primary mirror and secondary mirror are this Green's version of card.The present invention utilizes catoptron folded optical path, and the volume reducing camera lens alleviates quality, makes length can accomplish less than 0.6 times of focal length; Employing due to secondary imaging mode makes system parasitic light suppress easily.
Description
Technical field
The invention belongs to optical technical field, relate to a kind of infrared medium wave and the long wave two waveband confocal surface imaging system of light path altogether.
Background technology
Along with the development of multi-band infrared detector technology of new generation, the use of multi-spectral imaging becomes more and more extensive, in order to successful Application a new generation detector, must design the optical system that simultaneously can possess multi-spectral imaging ability.In infrared imaging field, the spectral band be most widely used is medium-wave infrared (3 μm-5 μm) and LONG WAVE INFRARED (8 μm-12 μm).These two wave bands are compared and are had different benefit and limitations.Best mode adopts two-band infrared detector to merge above two wave bands, makes them have complementary advantages.
Total-reflection type optical system structure form is generally the first-selection of multiband Optical System Design, but, two-band infrared detector is generally refrigeration-type detector, therefore in detector, there is cold door screen, the existence of cold door screen makes total-reflection type optical system must carry out secondary imaging to realize cold door screen coupling, and this just cannot use the two anti-systems be most widely used.Meanwhile, when needing the situation of compact physical dimension and Large visual angle, the design difficulty of total-reflection type optical system increases suddenly.
Adopt refractive optical system version, the material critical constraints that can select, is mainly germanium, zinc selenide, zinc sulphide, barium fluoride, gallium arsenide and part chalcogenide glass.Chromatic aberration correction is the main bugbear that two waveband Optical System Design faces.The focal length of optical system is larger, and system first lens sizes generally also can be larger, and this limits the range of application of two waveband refractive optical system more.
The patent No. is the refractive optical system technical scheme that the Chinese patent of 01132130.X discloses a key name and is called " infrared double wave band refraction/diffraction mixed optical imaging system ", this system utilizes the binary diffraction element that two centre wavelength is glittered to realize 3.5 μm-3.9 μm and 10.5 μm of-12.5 μm of two wavebands imagings simultaneously, due to the application of diffraction element, the spectral coverage of medium wave and long wave is narrower, and the transmitance of system is lower.
The patent No. be 201120201781.2 Chinese patent disclose the refraction type imaging optical system technical scheme that a key name is called " a kind of Double wave-band infrared imaging optics system ", this optical system adopts four transmissive elements, and Polaroid mode realizes medium-wave infrared (3 μm-5 μm) and LONG WAVE INFRARED (8 μm-12 μm) wave band at same focal plane imaging.This system optics overall length is greater than focal length, simultaneously because the employing of Polaroid mode makes this system parasitic light suppress difficulty.
Summary of the invention
The object of the invention is to solve the problem that the lower and system parasitic light of system transmitance that prior art exists suppresses difficulty, provide a kind of system transmitance higher and suppress the good two waveband of the system parasitic light confocal surface imaging system of light path altogether.
To achieve these goals, the common confocal surface imaging system of light path of two waveband of the present invention comprises primary mirror, secondary mirror, relay lens group and focus planardetector;
Described primary mirror, secondary mirror, relay lens group and focus planardetector are on same optical axis, the reflecting surface of described primary mirror and the reflecting surface arranged relative of described secondary mirror, described primary mirror has center pit, described relay lens group and focus planardetector are positioned at the center pit of described primary mirror, described relay lens group is between the first image planes and focus planardetector, and primary mirror and secondary mirror are Cassegrain's version; Light beam incides on secondary mirror after primary mirror reflects, is imaged in the first image planes by secondary mirror reflect focalization; Relay lens group, by the target image rotation in the first image planes, focuses in the second image planes; Described second image planes overlap with the focal plane arrays (FPA) of focus planardetector.
Described optical system spectral transmission scope is 3 μm-10 μm.
Described focus planardetector is refrigeration mode detector, comprise window, cold door screen and focal plane arrays (FPA), described cold door screen is between window and focal plane arrays (FPA), described window is based on infrared permeable material, and described focal plane array is classified as medium-wave infrared/LONG WAVE INFRARED two waveband focal plane arrays (FPA) or broadband focal plane arrays (FPA).
Described primary mirror is recessed non-spherical reflector, and described secondary mirror is convex aspheric surface catoptron; The material of described primary mirror and described secondary mirror is aluminium, silit, beryllium, aluminizing or devitrified glass.
The reflecting surface of described primary mirror is standard quadric surface or high order aspheric surface; The reflecting surface of described secondary mirror is standard quadric surface or high order aspheric surface; Described relay lens group comprises first refractive lens, the second refractor, third reflect lens and the fourth reflect lens that same optical axis order is placed.
Described first refractive lens are based on Ge crystalline material, and its front surface is sphere, and rear surface is aspheric surface.
Described second refractor is based on ZNS crystalline material, and its front and rear surfaces is sphere.
Described third reflect lens are based on BaF2 crystalline material, and its front and rear surfaces is sphere.
Described fourth reflect lens are based on ZnSe crystalline material, and its front surface is aspheric surface, and rear surface is sphere.
Beneficial effect of the present invention is: the two waveband of the present invention altogether confocal surface imaging system of light path adopts catadioptric configuration form, and primary mirror and secondary mirror can share most of focal power, and the focal length of relay lens group is little and bore little, and chromatic aberration correction is easy; Meanwhile, utilize catoptron folded optical path, reduce the volume of camera lens, alleviate quality, make system optics length can accomplish less than 0.6 times of focal length; Meanwhile, because the employing of secondary imaging mode makes system parasitic light suppress easily.
Accompanying drawing explanation
Fig. 1 is two waveband of the present invention light path confocal surface imaging system architecture schematic diagram altogether;
Fig. 2 is relay lens group structural representation of the present invention;
Fig. 3 is the MTF curve of design example of the present invention medium-wave band 3 μm ~ 5 μm;
Fig. 4 is the MTF curve of design example of the present invention long wave band 8 μm ~ 10 μm;
Wherein: 1, primary mirror, 2, secondary mirror, 3, relay lens group, 31, first refractive lens, 311, first refractive lens front surface, 312, first refractive lens rear surface, 32, second refractor, 321, second refractor front surface, 322, second refractor rear surface, 33, third reflect lens, 331, third reflect lens front surface, 332, third reflect lens rear surface, 34, fourth reflect lens, 341, fourth reflect lens front surface, 342, fourth reflect lens rear surface, 4, first image planes, 5, focus planardetector window, 6, the cold door screen of focus planardetector, 7, focal plane arrays (FPA), 8, focus planardetector.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
See accompanying drawing 1,2, the two waveband of the present invention altogether confocal surface imaging system of light path is made up of a primary mirror 1, secondary mirror 2, relay lens group 3 and a focus planardetector 8 from the object side to the image side in order.Focus planardetector 8 is medium-wave infrared/LONG WAVE INFRARED two waveband focal plane arrays (FPA) 7 or broadband focal plane arrays (FPA) 7, and for 3 μm ~ 5 μm and 8 μm ~ 10 μm heat radiation imagings in electromagnetic wave spectrum, system can to medium-wave infrared and LONG WAVE INFRARED imaging simultaneously.
Optical system of the present invention presses xyz right hand space coordinates ordered arrangement, and z-axis direction is decided to be optical axis direction, and y-axis is in plane shown in Fig. 1, and x-axis is perpendicular to yz plane, and yz coordinate plane is the meridian ellipse of optical system.
The all optical elements of system are arranged on same optical axis, the reflecting surface of primary mirror 1 and the reflecting surface arranged relative of secondary mirror 2, described primary mirror 1 has center pit, described relay lens group 3 and focus planardetector 8 are positioned at the center pit of described primary mirror 1, described relay lens group 3 is between the first image planes 4 and focus planardetector 8, and primary mirror 1 and secondary mirror 2 are Cassegrain's version.
Described focus planardetector 8 is refrigeration mode detector, comprise focus planardetector window 5, focus planardetector cold late 6 and focal plane arrays (FPA) 7, described focus planardetector window 5 is based on infrared permeable material, described focal plane arrays (FPA) 7 is two waveband focal plane arrays (FPA) 7 or broadband focal plane arrays (FPA) 7, described focus planardetector cold late 6 is between focus planardetector window 5 and focal plane arrays (FPA) 7, determine the solid angle of focal plane arrays (FPA) 7 receiving target radiation, focus planardetector cold late 6 is as the emergent pupil of optical system, object space overlaps with primary mirror 1 with the entrance pupil of its conjugation as far as possible, thus effectively reduce primary mirror 1 aperture.
Described relay lens group 3 comprises first refractive lens 31, second refractor 32, third reflect lens 33 and the fourth reflect lens 34 that same optical axis order is placed.
First refractive lens 31, second refractor 32, third reflect lens 33 and fourth reflect lens 34 are arranged between the first image planes 4 and the second image planes.Group Cassegrain formula optical system before primary mirror 1 and secondary mirror 2 are formed, first refractive lens 31, second refractor 32, third reflect lens 33 and fourth reflect lens 34 form relay lens group 3; Relay lens group 3 and focus planardetector 8 are placed in the center pit of primary mirror 1; The center of all optical elements is all in yz plane.
Light beam from object space incides on secondary mirror 2 after primary mirror 1 reflects, and by secondary mirror 2 reflect focalization, makes target imaging in the first image planes 4; Again by relay lens group 3 by the target image rotation in the first image planes 4, by focus planardetector window 5 and focus planardetector cold late 6, again focus in the second image planes; Described second image planes overlap with the focal plane arrays (FPA) 7 of imaging receiver device.
Described primary mirror 1 is recessed non-spherical reflector, and described secondary mirror 2 is convex aspheric surface catoptron; The material of described primary mirror 1 and described secondary mirror 2 is aluminium, silit, beryllium, aluminizing or devitrified glass.
The reflecting surface of described primary mirror 1 and the reflecting surface of described secondary mirror 2 are standard quadric surface or the high order aspheric surfaces such as parabola, ellipsoid and hyperboloid; The face shape of the recessed reflecting surface of described primary mirror 1 and the reflecting surface of described secondary mirror 2 can be the same or different.
The first refractive lens 31 of described relay lens group 3 are based on Ge crystalline material, and first refractive lens front surface 311 is sphere, and first refractive lens rear surface 312 is aspheric surface, and described aspheric surface is standard quadric surface or high order aspheric surface; Described second refractor 32 is based on ZNS crystalline material, and the second refractor front surface 321 and the second refractor rear surface 322 are sphere; Described third reflect lens 33 are based on BaF2 crystalline material, and the second refractor front surface 331 and the second refractor rear surface 332 are sphere; Described fourth reflect lens 34 are based on ZnSe crystalline material, and fourth reflect lens front surface 341 is aspheric surface, and fourth reflect lens rear surface 342 is sphere.
See accompanying drawing 3 and accompanying drawing 4, two waveband of the present invention is the confocal surface imaging system of light path altogether, and long wave band picture element is close to diffraction limit, and medium-wave band picture element reaches more than 0.35 at detector cutoff frequency place full filed MTF, and systematic technical indicator is as follows:
Table 1
About asphericity coefficient K, B, C, follow surperficial rise formula below:
Wherein, z is surperficial rise; C is the curvature of surface vertices, and r is the radial coordinate to surface vertices; K is circular cone coefficient; A, B, C and D are respectively four items, six items, eight items and ten term coefficient.
Should be understood that, every any simple deformation of making on technical solution of the present invention basis all the invention is intended within protection domain.
Claims (5)
1. the two waveband confocal surface imaging system of light path altogether, comprises primary mirror (1), secondary mirror (2), relay lens group (3) and focus planardetector (8); It is characterized in that,
Described primary mirror (1), secondary mirror (2), relay lens group (3) and focus planardetector (8) are on same optical axis, the reflecting surface of described primary mirror (1) and the reflecting surface arranged relative of described secondary mirror (2), described primary mirror (1) has center pit, described relay lens group (3) and focus planardetector (8) are positioned at the center pit of described primary mirror (1), described relay lens group (3) is positioned between the first image planes (4) and focus planardetector (8), and primary mirror (1) and secondary mirror (2) are Cassegrain's version; Light beam incides on secondary mirror (2) after primary mirror (1) reflection, is imaged in the first image planes (4) by secondary mirror (2) reflect focalization; Relay lens group (3), by the target image rotation in the first image planes (4), focuses in the second image planes; Described second image planes overlap with the focal plane arrays (FPA) (7) of focus planardetector (8);
Described relay lens group (3) comprises first refractive lens (31), the second refractor (32), third reflect lens (33) and the fourth reflect lens (34) placed along same optical axis order;
Described first refractive lens (31) are based on Ge crystalline material, and first refractive lens front surface (311) is sphere, and first refractive lens rear surface (312) is aspheric surface;
Described second refractor (32) is based on ZNS crystalline material, and its second refractor front surface (321) and the second refractor rear surface (322) are sphere;
Described third reflect lens (33) are based on BaF2 crystalline material, and its third reflect lens front surface (331) and third reflect lens rear surface (332) are sphere;
Described fourth reflect lens (34) are based on ZnSe crystalline material, and its fourth reflect lens front surface (341) is aspheric surface, and fourth reflect lens rear surface (342) is sphere.
2. the two waveband according to claim 1 confocal surface imaging system of light path altogether, it is characterized in that, described imaging system spectral transmission scope is 3 μm-10 μm, and system can to medium-wave infrared and LONG WAVE INFRARED imaging simultaneously.
3. the two waveband according to claim 1 confocal surface imaging system of light path altogether, it is characterized in that, described focus planardetector (8) is refrigeration mode detector, comprise focus planardetector window (5), the cold door screen of focus planardetector (6) and focal plane arrays (FPA) (7), the cold door screen of described focus planardetector (6) is positioned between focus planardetector window (5) and focal plane arrays (FPA) (7), described focus planardetector window (5) is based on infrared permeable material, described focal plane arrays (FPA) (7) is medium-wave infrared/LONG WAVE INFRARED two waveband focal plane arrays (FPA) (7) or broadband focal plane arrays (FPA) (7).
4. the two waveband according to claim 1 confocal surface imaging system of light path altogether, it is characterized in that, described primary mirror (1) is recessed non-spherical reflector, and described secondary mirror (2) is convex aspheric surface catoptron; The material of described primary mirror (1) and described secondary mirror (2) is aluminium, silit, beryllium, aluminizing or devitrified glass.
5. the two waveband according to claim 1 confocal surface imaging system of light path altogether, it is characterized in that, the reflecting surface of described primary mirror (1) is standard quadric surface or high order aspheric surface; The reflecting surface of described secondary mirror (2) is standard quadric surface or high order aspheric surface.
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Effective date of registration: 20190424 Address after: Room C301, 1759 Mingxi Road, Beihu Science and Technology Development Zone, Changchun City, Jilin Province, 130000 Patentee after: Changchun Chang Guang Zhi Ou Technology Co., Ltd. Address before: 130033 southeast Lake Road, Changchun, Jilin Province, No. 3888 Patentee before: Changchun Inst. of Optics and Fine Mechanics and Physics, Chinese Academy of Sci |
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