CN109656006B - Wide-spectrum non-focusing all-day air bright imager - Google Patents
Wide-spectrum non-focusing all-day air bright imager Download PDFInfo
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- CN109656006B CN109656006B CN201910007970.7A CN201910007970A CN109656006B CN 109656006 B CN109656006 B CN 109656006B CN 201910007970 A CN201910007970 A CN 201910007970A CN 109656006 B CN109656006 B CN 109656006B
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- 238000001228 spectrum Methods 0.000 title claims abstract description 12
- 238000003384 imaging method Methods 0.000 claims abstract description 67
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 239000006185 dispersion Substances 0.000 claims abstract description 8
- 238000004026 adhesive bonding Methods 0.000 claims description 28
- 239000011521 glass Substances 0.000 claims description 5
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000004501 airglow Methods 0.000 abstract description 21
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000004907 flux Effects 0.000 abstract description 4
- 230000003595 spectral effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 9
- 230000004075 alteration Effects 0.000 description 8
- 230000005855 radiation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000005308 flint glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/006—Filter holders
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
Abstract
The invention relates to an airglow imager, and provides a wide-spectrum non-focusing all-day airglow imager aiming at the problems of complex structure, low luminous flux and the like of the imager caused by the small detection field, narrow spectral range and the need of adopting a mechanical focusing device of the existing airglow imager. The imaging instrument comprises an image space telecentric fisheye lens, an object space telecentric imaging lens and a detector; a filter wheel is arranged between the fisheye lens and the imaging lens, a plurality of narrow-band optical filters with different wave bands and zero focal power are arranged on the filter wheel, and the filter wheel can switch the narrow-band optical filters to the focal plane of the fisheye lens; the fisheye lens comprises a front lens group with negative focal power and a rear lens group with positive focal power, and an aperture diaphragm is arranged on an optical path between the front lens group and the rear lens group; the imaging lens comprises a plurality of cemented lenses formed by positive lenses and negative lenses, the absolute value of the difference value of the relative Abbe numbers of the positive lenses and the negative lenses is more than or equal to 5, and the absolute value of the difference value of the relative dispersion is less than or equal to 0.001.
Description
Technical Field
The invention relates to an airglow imager, in particular to a wide-spectrum non-focusing all-day airglow imager.
Background
The airglow is an important natural luminescence phenomenon in the earth space environment, is light with a certain wavelength emitted by molecular atoms in the atmosphere excited by solar shortwave ultraviolet radiation, generally appears between 50 km and 500km above the earth, has low brightness, is unevenly distributed, is not easy to be perceived, and can be observed only by very sensitive instruments.
The spatial and temporal distribution of the airglow is modulated by various aerodynamic processes such as tidal waves, atmospheric gravitational waves and planetary waves, is an important tracer for aerodynamic processes and atmospheric photochemical processes, and has a special position in the field of daily physical research.
As shown in fig. 1 and 2, a conventional airglow imager is composed of optical devices such as a fisheye lens 01, a diaphragm 02, a first imaging lens 03, a filter wheel 04 (including a filter 041), a second imaging lens 05, a CCD detector 06, a mechanical focusing device 07, and a computer 08.
Because the structure of the existing imager has higher requirement on the quality of the surface type of the optical filter, the detection wave band of the imager has wide range, and the optical filters of different wave bands of the system have axial chromatic aberration. After the optical filters are switched, the image plane is shifted, and the imaging quality is affected. It is therefore necessary to perform focusing with the mechanical focusing device 07 after the filter wheel 04 switches the filters 041. However, the mechanical focusing device 07 has a complex structure, which increases the manufacturing cost of the imager; and because the filters 041 are required to be focused on different wavelength filters 041 after the filters 041 are switched by the filter wheel 04 each time, the use and the operation of the imager are complicated; the mechanical focusing device 07 may also malfunction, affecting the imaging quality of the imager or even failing to image.
And the conventional fisheye lens 01 (such as Nikon 8mm f/2.8 fisheye lens) is adopted in the conventional imager, an additional telecentric first imaging lens 03 is required to match the requirement of the optical filter 041 on the incident angle of the incident light, but the conventional fisheye lens 01 is narrower in the wavelength band of the imager in the form of matching imaging lens structure, and the additional first imaging lens 03 also leads to more complex structure of the imager. Meanwhile, as the finished fisheye lens 01 adopted by the airglow imager with the structure has smaller aperture at the primary image surface corresponding to the first imaging mirror 03, the effective relative aperture of the optical filter 041 matched with the fisheye lens is small, the luminous flux of the system is reduced, and weak airglow signals can not be accurately detected.
Disclosure of Invention
The invention aims to overcome the defects of the prior airglow imager such as small detection field, narrow spectrum range, complicated structure and use operation of the imager, low luminous flux of the imager and the like caused by adopting a mechanical focusing device, and provides a wide-spectrum non-focusing all-day airglow imager. The imaging instrument can economically and conveniently realize multi-channel all-day air bright imaging and realize high-precision all-day air bright observation on the basis of ensuring higher light quantity of the whole system.
In order to achieve the aim, the invention provides a wide-spectrum non-focusing all-day air bright imager which is characterized by comprising an image space telecentric fisheye lens, an object space telecentric imaging lens and a detector which are sequentially arranged along the same optical axis from left to right;
a filter wheel is arranged between the fisheye lens and the imaging lens, a plurality of narrow-band optical filters with different wave bands and zero focal power are arranged on the filter wheel, and the filter wheel can switch the narrow-band optical filters to the focal plane of the fisheye lens;
the fisheye lens comprises a front lens group with negative focal power and a rear lens group with positive focal power, an aperture diaphragm is arranged on an optical path between the front lens group and the rear lens group, and the aperture diaphragm is positioned on a front focal plane of the rear lens group; the imaging lens comprises a plurality of cemented lenses formed by positive lenses and negative lenses, the relative Abbe numbers of the positive lenses and the negative lenses are respectively marked as A and B, the absolute A-B absolute value is more than or equal to 5, and the relative chromatic dispersion of the positive lenses and the negative lenses is respectively marked as C and D, and the absolute C-D is less than or equal to 0.001. Positive lenses are generally crown glasses with a large abbe number, and negative lenses are generally flint glasses with a small abbe number.
Further, the rear lens group of the fish-eye lens comprises at least one bonding lens formed by bonding a positive lens and a negative lens, the relative Abbe numbers of the positive lens and the negative lens are respectively marked as a and b, the relative dispersion of the positive lens and the negative lens is respectively marked as c and d, and the relative dispersion of the positive lens and the negative lens is respectively marked as c-d is less than or equal to 0.001. The glue lens is arranged on the fish-eye lens to optimize the axial chromatic aberration of the primary image surface of the fish-eye lens, so that the overall image quality of the optical filter system switched at the primary image plane is not changed.
Further, the imaging lens includes, from left to right, a first imaging lens, a third cemented lens, a fourth cemented lens, a fifth cemented lens, and an eighth imaging lens; the third bonding lens is formed by bonding a biconvex positive lens and a biconcave negative lens from left to right, wherein the biconvex positive lens is made of H-FK61, and the biconcave negative lens is made of KF2; the fourth gluing lens is formed by gluing a positive lens of a convex surface to a diaphragm and a biconvex positive lens from left to right, wherein the positive lens is made of KF2, and the biconvex positive lens is made of H-FK61; the fifth bonding lens is formed by bonding a biconvex positive lens and a biconcave negative lens from left to right, wherein the biconvex positive lens is made of H-FK61, and the biconcave negative lens is made of KF2.
Further, the narrow-band filter is a glass plate; the first imaging lens of the imaging lens is a biconvex positive lens, and the eighth imaging lens is a biconvex positive lens; the narrow-band filter, the first imaging lens and the eighth imaging lens are all made of H-ZLAF92.
Further, the front lens group of the fisheye lens comprises a first front lens, a second front lens, a third front lens, a first bonding lens and a sixth front lens from left to right; the first gluing lens is formed by gluing a negative lens of a concave surface diaphragm and a biconvex positive lens from left to right, wherein the negative lens is made of KF2, and the biconvex positive lens is made of H-FK61; the rear lens group comprises a second cemented lens and a third rear lens from left to right; the second gluing mirror is formed by gluing a biconcave negative lens and a biconvex positive lens from left to right, wherein the biconcave negative lens is made of KF2, and the biconvex positive lens is made of H-FK61.
Further, the first front lens of the fisheye lens front lens set is a negative lens of a concave surface diaphragm; the second front lens is a negative lens of the concave surface directional diaphragm; the third front lens is a negative lens of the concave reverse diaphragm; the sixth front lens is a biconvex positive lens; the third rear lens of the rear lens group is a biconvex positive lens; the first front lens, the second front lens, the third front lens and the sixth front lens are made of H-ZLAF92, H-FK61, H-ZF6 and H-FK61 respectively; the third rear lens is made of H-FK61.
Further, the filter wheel comprises 8 narrow-band filters with the size of 4 inches, and the central wavelengths of the 8 narrow-band filters are 427.8nm, 557.7nm, 578.0nm, 589.3nm, 598.5nm, 630.0nm, 777.4nm and 865.0nm respectively. The motor of the filter wheel drives the filter wheel to rotate and switch, so that multichannel alternate observation can be realized.
Further, the focal length of the fisheye lens is 35.35mm, F# is 10.3, F# of the imaging lens is 2.8, and beta is-0.2721.
Further, the interval between the front lens group and the rear lens group is 77.9mm, the interval between the rear lens group and the narrow band filter is 123.78mm, and the interval between the narrow band filter and the imaging lens is 160mm. The interval between the first front lens and the second front lens is 35.42mm, the interval between the second front lens and the third front lens is 97.91mm, the interval between the third front lens and the first bonding lens is 3.13mm, and the interval between the first bonding lens and the sixth front lens is 5.38mm; the interval between the second gluing mirror and the third rear lens is 157.66mm; the interval between the first imaging lens and the third gluing lens is 132.59mm, the interval between the third gluing lens and the fourth gluing lens is 7.46mm, the interval between the fourth gluing lens and the fifth gluing lens is 2mm, and the interval between the fifth gluing lens and the eighth imaging lens is 5.33mm. The distance between the surface of the first front lens close to the object side and the focal plane of the imager optical system is 1099.42mm.
Further, the detector is a scientific grade CCD camera.
Compared with the prior art, the invention has the advantages that:
1. the narrow-band filter is arranged on the primary image surface, so that the requirement on the surface quality of the filter is reduced; and the gluing mirror of the imaging mirror selects specific glass materials (such as KF2 and H-FK 61), apochromatic optimization is carried out on the light rays within the full-band wide spectrum range (427.8-865 nm) of the system, so that not only the position chromatic aberration of marginal light rays is eliminated, but also apochromatic aberration is formed on the light rays within the full-band wide spectrum range. The high-quality imaging is realized, and the requirements of weak airglow radiation detection are met; and an image plane focusing device is omitted, the complexity of the system is reduced, and the manufacturing cost of the imager is saved.
2. According to the invention, the fisheye lens telecentric in image space is adopted, so that the chief rays of different view fields are perpendicular to the optical filter, the aperture angles of the imaging light beams on the primary image plane axis and the imaging light beam on the off-axis view field are consistent, and the transmission uniformity of the optical filter is further ensured; meanwhile, the incident angle of incident light can reach the bandwidth requirements of a plurality of filters with different wave bands of the filter wheel, and multi-band multi-channel observation can be realized.
3. The invention increases the aperture of the primary image surface by simplifying the system structure of the imager, reducing the number of lenses and adopting the special image-space telecentric fisheye lens, thereby increasing the effective relative aperture of the optical filter, and finally increasing the luminous flux of the system, so that the imager has higher detection capability.
Drawings
FIG. 1 is a schematic diagram of the system components of a prior art airglow imager;
FIG. 2 is a schematic diagram of the optical path structure of a conventional airglow imager;
FIG. 3 is a schematic view of the optical path structure of one embodiment of an airglow imager of the present invention;
FIG. 4 is a graph of the transfer function of the optical system of the embodiment of FIG. 3 at a spatial frequency 371 p/mm;
FIG. 5 is a point diagram of the optical system of the embodiment of FIG. 3;
FIG. 6 is a paraxial chromatic aberration curve of the optical system of the embodiment of FIG. 3.
The description of the reference numerals in fig. 1 and 2 is as follows:
01-fish eye lens, 02-diaphragm, 03-first imaging lens, 04-filter wheel, 041-filter, 05-second imaging lens, 06-CCD detector, 07-mechanical focusing device, 08-computer;
the description of the reference numerals in fig. 3 to 6 is as follows:
1-a fish-eye lens;
11-front lens group, 111-first front lens, 112-second front lens, 113-third front lens, 114-first cemented lens, 115-sixth front lens, 116-aperture stop;
12-rear lens group, 121-second cemented lens, 122-third rear lens;
2-a narrowband filter;
3-imaging lens, 31-first imaging lens, 32-third bonding lens, 33-fourth bonding lens, 34-fifth bonding lens, 35-eighth imaging lens.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
The embodiment provides a wide-spectrum non-focusing all-day air bright imager, which comprises an image-space telecentric fisheye lens 1, an object-space telecentric imaging lens 3 and a detector (not shown) which are sequentially arranged from left to right along the same optical axis. The detector may be a scientific grade CCD camera.
Referring to fig. 3, a filter wheel (not shown) is arranged between the fisheye lens 1 and the imaging lens 3, and is provided with 8 narrow-band optical filters 2 with different wave bands, zero optical power and 4 inches in size, and the filter wheel can switch the narrow-band optical filters 2 to the focal plane of the fisheye lens 1;
the narrowband filter 2 is a glass plate, and the adopted materials are H-ZLAF92. The center wavelengths of the 8 narrow-band filters 2 are 427.8nm, 557.7nm, 578.0nm, 589.3nm, 598.5nm, 630.0nm, 777.4nm and 865.0nm respectively. The motor of the filter wheel drives the filter wheel to rotate and switch, so that multi-channel alternate observation is realized.
The main gas components and distribution heights corresponding to the detection bands of the 8 filters are shown in the following table.
The rear lens group 12 of the fish-eye lens 1 comprises at least one cemented lens formed by a positive lens cemented with a negative lens, the absolute value of the difference in relative abbe numbers of the positive lens and the negative lens is 5 or more, and the absolute value of the difference in relative dispersion is 0.001 or less. In this embodiment, the fisheye lens 1 includes a front lens group 11 with negative focal power and a rear lens group 12 with positive focal power, an aperture stop 116 is disposed on an optical path between the front lens group 11 and the rear lens group 12, and the aperture stop 116 is located on a front focal plane of the rear lens group 12. The front lens group 11 mainly bears the angle of view and the rear working distance; the rear lens group 12 belongs to a projection objective for imaging near distances, is burdened with a large deflection angle, and provides a partial aberration in balance with the residual aberration of the front lens group 11.
The front lens group 11 of the fish-eye lens 1 includes, from left to right, a first front lens 111, a second front lens 112, a third front lens 113, a first cemented lens 114, and a sixth front lens 115; the first front lens 111 is a negative lens of a concave surface aperture stop, and the adopted material is H-ZLAF92; the second front lens 112 is a negative lens of a concave surface aperture stop, and the adopted material is H-FK61; the third front lens 113 is a negative lens of a concave reverse diaphragm, and the adopted material is H-ZF6; the first gluing mirror 114 is formed by gluing a negative lens of a concave surface to a diaphragm and a biconvex positive lens from left to right, wherein the negative lens is made of KF2, and the biconvex positive lens is made of H-FK61; the sixth front lens 115 is a biconvex positive lens, and the material used is H-FK61.
The rear lens group 12 includes, from left to right, a second cemented lens 121 and a third rear lens 122; the second gluing mirror 121 is formed by gluing a biconcave negative lens, which is made of KF2, and a biconvex positive lens, which is made of H-FK61, from left to right. The third rear lens 122 is a biconvex positive lens, and the material used is H-FK61.
The imaging lens 3 comprises a plurality of cemented lenses formed by positive lenses and negative lenses, wherein the absolute value of the difference value of the relative Abbe numbers of the positive lenses and the negative lenses is more than or equal to 5, and the absolute value of the difference value of the relative dispersion is less than or equal to 0.001. In the present embodiment, the imaging lens 3 includes, from left to right, a first imaging lens 31, a third cemented lens 32, a fourth cemented lens 33, a fifth cemented lens 34, and an eighth imaging lens 35. The first imaging lens 31 is a biconvex positive lens, and the adopted material is H-ZLAF92; the third bonding lens 32 is formed by bonding a biconvex positive lens and a biconcave negative lens from left to right, wherein the biconvex positive lens is made of H-FK61, and the biconcave negative lens is made of KF2; the fourth bonding lens 33 is formed by bonding a positive lens of a convex surface to a diaphragm and a biconvex positive lens from left to right, wherein the positive lens is made of KF2, and the biconvex positive lens is made of H-FK61; the fifth gluing mirror 34 is formed by gluing a biconvex positive lens and a biconcave negative lens from left to right, wherein the biconvex positive lens is made of H-FK61, and the biconcave negative lens is made of KF2; the eighth imaging lens 35 is a biconvex positive lens, and the material used is H-ZLAF92.
After the incident light reaches the narrow-band filter 2 at the focal plane of the fisheye lens 1, the intensity information of the airglow radiation in the middle-high-layer atmosphere characteristic height area is extracted by utilizing the narrow-band filter 2; an all-day airglow radiation intensity distribution image was recorded using a high sensitivity detector. And analyzing the image by a computer to obtain the observation data of the atmospheric fluctuation of the airglow height area.
Specific structural parameters of the optical system of the imager of this embodiment are shown in the following table.
The f# of the imager optical system of the present embodiment is 2.8; the focal length is 9.63mm; the image height is 13.824mm, and the view field is 180 degrees; the CCD imaging device with 2048 multiplied by 2048 pixels and 13.5um pixel size can be adapted; the focal length of the fish-eye lens was 35.35mm and F# was 10.3. The imaging lens has F# of 2.8 and beta of-0.2721.
Referring to fig. 4, the system has an MTF value of 0.82 greater at 37lp/mm spatial frequency, either the sagittal plane (S) or the meridional plane (T), approaching the diffraction limit, with excellent imaging quality.
Fig. 5 is a dot column diagram reflecting the size of the diffuse spot imaged by the system on the image plane. As shown in fig. 5, the on-axis dispersion root mean square radius is 2.289um, the full-view-field root mean square radius is 3.613um, and the imaging quality of the optical system is uniformly distributed in the whole view field range.
As can be seen from FIG. 6, the second-order spectral aberration is about 0.048mm, the maximum focal shift is within five times of the diffraction limit change, the smaller maximum focal shift is achieved, the second-order spectral requirement is met, and the correction of the second-order spectrum can be well achieved.
In conclusion, the implementation realizes the imaging observation of all-sky multichannel airglow by taking atmospheric airglow radiation as a tracer through an image space telecentric fisheye lens, a narrow-band optical filter with zero focal power and an object space telecentric imaging lens and matching with a detector.
The above description is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the technical scope of the present invention, and any known modifications made by those skilled in the art based on the main technical concept of the present invention fall within the technical scope of the present invention.
Claims (5)
1. The wide-spectrum non-focusing all-day air bright imager is characterized by comprising an image space telecentric fisheye lens (1), an object space telecentric imaging lens (3) and a detector which are sequentially arranged from left to right along the same optical axis;
a filter wheel is arranged between the fisheye lens (1) and the imaging lens (3), a plurality of narrow-band optical filters (2) with different wave bands and zero focal power are arranged on the filter wheel, and the filter wheel can switch the narrow-band optical filters (2) to the focal plane of the fisheye lens (1);
the fisheye lens (1) comprises a front lens group (11) with negative focal power and a rear lens group (12) with positive focal power, an aperture diaphragm (116) is arranged on a light path between the front lens group (11) and the rear lens group (12), and the aperture diaphragm (116) is positioned on the front focal plane of the rear lens group (12);
the front lens group (11) comprises a first front lens (111), a second front lens (112), a third front lens (113), a first bonding mirror (114) and a sixth front lens (115) from left to right; the first bonding mirror (114) is formed by bonding a negative lens of a concave surface diaphragm and a biconvex positive lens from left to right, wherein the negative lens is made of KF2, and the biconvex positive lens is made of H-FK61;
the rear lens group (12) comprises a second bonding mirror (121) and a third rear lens (122) from left to right; the second bonding mirror (121) is formed by bonding a biconcave negative lens and a biconvex positive lens from left to right, wherein the biconcave negative lens is made of KF2, and the biconvex positive lens is made of H-FK61;
the imaging lens (3) comprises a first imaging lens (31), a third gluing lens (32), a fourth gluing lens (33), a fifth gluing lens (34) and an eighth imaging lens (35) from left to right; the third gluing mirror (32) is formed by gluing a biconvex positive lens and a biconcave negative lens from left to right, wherein the biconvex positive lens is made of H-FK61, and the biconcave negative lens is made of KF2; the fourth bonding mirror (33) is formed by bonding a positive lens of a convex surface to a diaphragm and a biconvex positive lens from left to right, wherein the positive lens is made of KF2, and the biconvex positive lens is made of H-FK61; the fifth gluing mirror (34) is formed by gluing a biconvex positive lens and a biconcave negative lens from left to right, wherein the biconvex positive lens is made of H-FK61, and the biconcave negative lens is made of KF2;
the absolute value of the difference value of the relative Abbe numbers of the positive lens and the negative lens of the cementing lens in the rear lens group (12) and the imaging lens (3) is more than or equal to 5, and the absolute value of the difference value of the relative dispersion is less than or equal to 0.001;
the narrow-band optical filter (2) is a glass plate; the first imaging lens (31) is a biconvex positive lens, and the eighth imaging lens (35) is a biconvex positive lens; the first front lens (111) is a negative lens of a concave surface diaphragm; the second front lens (112) is a negative lens of a concave surface diaphragm; the third front lens (113) is a negative lens of a concave reverse diaphragm; the sixth front lens (115) is a biconvex positive lens; the third rear lens (122) is a biconvex positive lens;
the narrow-band filter (2), the first imaging lens (31) and the eighth imaging lens (35) are made of H-ZLAF92; the first front lens (111), the second front lens (112), the third front lens (113) and the sixth front lens (115) are made of H-ZLAF92, H-FK61, H-ZF6 and H-FK61 respectively; the third rear lens (122) is made of H-FK61.
2. A wide-band non-focused all-day air bright imager according to claim 1, wherein: the filter wheel comprises 8 narrow-band filters (2) with the size of 4 inches, and the central wavelengths of the 8 narrow-band filters (2) are 427.8nm, 557.7nm, 578.0nm, 589.3nm, 598.5nm, 630.0nm, 777.4nm and 865.0nm respectively.
3. A wide-band non-focused all-day air bright imager as defined in claim 2, wherein: the focal length of the fisheye lens (1) is 35.35mm, F# is 10.3, F# of the imaging lens (3) is 2.8, and beta is-0.2721.
4. A wide-band non-focused all-day air bright imager as set forth in claim 3, wherein: the interval between the front lens group (11) and the rear lens group (12) is 77.9mm,
the interval between the rear lens group (12) and the narrow-band filter (2) is 123.78mm,
the interval between the narrow-band filter (2) and the imaging mirror is 160mm;
the interval between the first front lens (111) and the second front lens (112) is 35.42mm,
the interval between the second front lens (112) and the third front lens (113) is 97.91mm,
the distance between the third front lens (113) and the first bonding mirror (114) is 3.13mm,
the interval between the first bonding mirror (114) and the sixth front lens (115) is 5.38mm;
the interval between the second bonding mirror (121) and the third rear lens (122) is 157.66mm;
the interval between the first imaging lens (31) and the third bonding lens (32) is 132.59mm,
the interval between the third bonding mirror (32) and the fourth bonding mirror (33) is 7.46mm,
the interval between the fourth bonding mirror (33) and the fifth bonding mirror (34) is 2mm,
the interval between the fifth gluing mirror (34) and the eighth imaging lens (35) is 5.33mm;
the distance between the surface of the first front lens (111) close to the object side and the focal plane of the imager optical system is 1099.42mm.
5. A wide band non-focused all-day air bright imager according to claim 4 wherein: the detector is a scientific CCD camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910007970.7A CN109656006B (en) | 2019-01-04 | 2019-01-04 | Wide-spectrum non-focusing all-day air bright imager |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910007970.7A CN109656006B (en) | 2019-01-04 | 2019-01-04 | Wide-spectrum non-focusing all-day air bright imager |
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| CN109656006A CN109656006A (en) | 2019-04-19 |
| CN109656006B true CN109656006B (en) | 2024-04-09 |
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| CN109884776B (en) * | 2019-04-26 | 2020-05-12 | 中国科学院长春光学精密机械与物理研究所 | Large-view-field, low-distortion and high-spectrum optical system based on pixel-level optical filter |
| WO2021081947A1 (en) * | 2019-10-31 | 2021-05-06 | 华为技术有限公司 | Radar system, filter and mobile platform |
| WO2021183038A1 (en) * | 2020-03-10 | 2021-09-16 | Advanced Instrument Pte. Ltd. | Optical system and method of forming the same |
| CN112240801A (en) * | 2020-10-13 | 2021-01-19 | 中国科学院长春光学精密机械与物理研究所 | Polarization imaging system |
| CN113126121B (en) * | 2021-03-17 | 2021-12-07 | 中国科学院国家空间科学中心 | Middle and high-rise atmospheric wind field measuring device |
| WO2023206069A1 (en) * | 2022-04-26 | 2023-11-02 | 公安部物证鉴定中心 | Optical imaging system with built-in optical filter based on small-angle light passing |
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