CN114415312A - Lens cone structure suitable for bright background imaging condition - Google Patents
Lens cone structure suitable for bright background imaging condition Download PDFInfo
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- CN114415312A CN114415312A CN202111566530.9A CN202111566530A CN114415312A CN 114415312 A CN114415312 A CN 114415312A CN 202111566530 A CN202111566530 A CN 202111566530A CN 114415312 A CN114415312 A CN 114415312A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0018—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for preventing ghost images
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention provides a lens cone structure suitable for bright background imaging conditions, which comprises a lens cone body, array type micro-honeycomb holes and a light absorption coating, wherein the array type micro-honeycomb holes are arranged on the inner surface of the lens cone body, the light absorption coating is coated on the annular inner wall of the micro-honeycomb holes, non-field light entering an optical-mechanical system or secondary stray light generated by an optical part and a structural part in the optical-mechanical system is obliquely incident on the inner wall of the micro-honeycomb holes of the lens cone body, and light reflected in the micro-honeycomb hole cavity is absorbed in multiple stages through the light absorption coating. The lens cone structure is based on impedance matching and effective attenuation wave-absorbing electromagnetic theory, and the parameters of the cellular microstructure such as opening angle, cellular height, cellular aperture, cellular wall thickness and the like are designed, so that the device can overcome the defects of low suppression ratio (90%) of imaging stray light, uncertain scattering direction and the like of the traditional stray light elimination means, realize weak reflection, multistage attenuation and strong absorption of visible/near-infrared stray light in a view field range, and the suppression effect is more than 99%.
Description
Technical Field
The invention belongs to the technical field of optical imaging devices, and particularly relates to a lens cone structure suitable for a bright background imaging condition.
Background
Stray light is mainly classified into the following three types: (1) external stray light is radiation energy emitted by strong radiation sources such as sunlight, terrestrial light, moonlight and the like in the environment outside the field of view for a space camera. (2) The internal stray light is mainly used for controlling heat radiation generated by a motor, a temperature control heat source, an optical element with higher temperature and the like. (3) Imaging stray light, which is caused by abnormal path propagation of imaging light, such as residual reflection, scattering and diffraction on the surface of the optical element, wherein even-number reflections form a spot on the detector, which is a ghost image. Of the three kinds of stray light, the internal stray light mainly exists in the infrared optical system, the imaging stray light exists in specific system conditions, and the first kind of external stray light generally affects all the optical systems.
When the sunlight is imaged or the brightness difference between the detected target and the background is very large, the effective target signal is very easy to be submerged by the ineffective background signal, so the influence of stray light on the detection system must be solved. Under bright background imaging conditions, external stray light and imaging stray light are the main factors of the stray light source. External stray light is generally shielded and suppressed by adopting a light shield and a light blocking ring assembly, and for imaging stray light, because the traditional detection load is generally imaged on the ground or detected in a deep space, the influence of the imaging stray light on the detection capability is small, and related suppression and solution measures are few.
The main sources and effects of imaging stray light are as follows: stray light in a view field enters the detection system and is scattered by the optical structure and the elements, light rays strike the inner wall of the lens cone and are reflected to the detector, the stray light forms a halo around an image of an observed object, and image background noise is increased. After entering the system, the high-flow-intensity sunlight can generate non-imaging light rays in the optical and structural system, and the non-imaging light rays reaching the photosensitive surface of the detector or the imaging light rays reaching the photosensitive surface through an off-design light path can seriously influence the detector to receive target light rays. Stray light generates light spots with extremely high energy on an imaging surface, and simultaneously causes the reduction of imaging contrast, the reduction of image gradation and the deterioration of definition.
In order to reduce the problem of strong stray light in a field of view, at present, 90% stray light suppression is usually realized by means of black paint and an extinction thread design, but in the face of an application background of bright background imaging, scattering and reflection phenomena of 10% of light in the field of view still have fatal influence on imaging.
Disclosure of Invention
In order to overcome the defects in the prior art, the inventor of the invention carries out intensive research, provides a lens cone structure suitable for the bright background imaging condition, designs parameters such as the opening angle of a honeycomb microstructure, the honeycomb height, the honeycomb aperture, the honeycomb wall thickness and the like based on the impedance matching and effective attenuation wave-absorbing electromagnetic theory, so that the device can overcome the defects of low inhibition ratio (90%) of imaging stray light, uncertain scattering direction and the like of the traditional stray light eliminating means, realizes weak reflection, multistage attenuation and strong absorption of visible/near-infrared stray light in a view field range, and achieves the inhibition effect of more than 99%, thereby completing the invention.
The technical scheme provided by the invention is as follows:
the utility model provides a lens cone structure suitable for under bright background imaging condition, includes lens cone barrel, array formula micro-honeycomb hole and extinction coating, the internal surface of lens cone barrel is located to array formula micro-honeycomb hole, and the extinction coating coats on the annular inner wall of micro-honeycomb hole, and the secondary stray light that gets into the non-field of view light of ray apparatus system or ray apparatus in the ray apparatus system, structure produced is incident to the micro-honeycomb hole inner wall of lens cone barrel on one side, carries out multistage absorption to the light of the internal reflection of micro-honeycomb vestibule through the extinction coating.
Furthermore, the array type micro-honeycomb holes are arranged in an annular array along the inner surface of the lens cone body, and the opening direction of the single micro-honeycomb hole points to the axis of the lens cone.
Furthermore, the included angle between the opening direction of the array-type micro-honeycomb holes and the axial line of the lens barrel is any value in the range of +85 degrees to +90 degrees, and the included angle is a positive direction towards the opening direction of the lens barrel. Furthermore, in the array type micro-honeycomb holes, the opening directions of the micro-honeycomb holes with different distances from the lens cone opening are not equal to the included angle of the axial lead of the lens cone; the closer to the lens barrel opening, the smaller the included angle between the opening direction of the micro honeycomb holes and the axial lead of the lens barrel; the farther away from the lens barrel opening, the larger the included angle between the opening direction of the micro honeycomb holes and the axial lead of the lens barrel.
Furthermore, the honeycomb height of the array type micro-honeycomb holes is 1-2 mm, the center distance of the adjacent micro-honeycomb holes is 0.5-1 mm, and the wall thickness of the micro-honeycomb holes is 0.1-0.2 mm.
Further, the light absorbing coating is coated on the annular inner wall of the array type micro honeycomb holes in an equal thickness.
Furthermore, the array type micro-honeycomb holes and the lens barrel body are designed and processed integrally.
Further, the processing method of the lens barrel structure comprises the following steps:
s1, dispersing the lens cone and the array type microcellular hole integrated three-dimensional CAD model into layered slices with certain thickness and sequence by adopting slice software;
s2, setting the scanning path, speed and laser intensity of the laser according to the profile of each layer of slice, and converting into corresponding computer program;
s3, vacuumizing the laser melting deposition cavity, and filling inert gas;
s4, sending the powder to the substrate by a program control powder roller to form a layer of uniform metal powder;
s5, scanning the powder under the control of a computer by a laser, and melting the spread powder to finish single slice processing; and (5) performing circulating operation to finish the integrated processing of the lens cone body and the array type micro-honeycomb holes.
The lens barrel structure suitable for the bright background imaging condition has the following beneficial effects:
(1) the lens cone structure is suitable for the imaging condition of a bright background, the traditional stray light eliminating means mainly depends on black paint and extinction threads, no special solution is provided for imaging stray light, and the inhibiting effect mainly depends on the black paint light absorption performance;
(2) according to the lens cone structure suitable for the bright background imaging condition, the layered processing of the structural part is completed by adopting a Selective Laser Melting (SLM) technology in a 3D printing technology, and compared with the traditional processing means, the fine processing of a small and complex structure can be realized, and the problems of processing deformation, insufficient precision and the like of the small structure cannot be caused;
(3) according to the lens cone structure suitable for the bright background imaging condition, the lens cone barrel and the array type micro-honeycomb holes are integrally machined, so that errors caused by coupling between the lens cone barrel and the array type micro-honeycomb holes are avoided, and influences caused by factors such as mechanical vibration and thermal effects are also avoided.
Drawings
FIG. 1 is an integrated structure diagram of a lens barrel body and an array type micro-honeycomb hole in a lens barrel structure design suitable for a bright background imaging condition according to the present invention;
FIG. 2 is a view of a micro-honeycomb structure in a lens barrel structure design suitable for bright background imaging conditions according to the present invention;
FIG. 3 is a schematic diagram of the absorption of micro-honeycomb holes in a lens barrel structure design under bright background imaging conditions according to the present invention;
FIG. 4 is a flow chart of an integrated 3D printing process of a lens barrel body and an array type micro-honeycomb hole in a lens barrel structure design under a bright background imaging condition according to the present invention;
fig. 5 is a diagram of analyzing strays of the inner wall of the honeycomb structure and the inner wall of the honeycomb structure in the lens barrel structure design under the bright background imaging condition under Tracepro software.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention provides a lens cone structure suitable for bright background imaging, which can overcome the defects of low imaging stray light inhibition ratio (90%), uncertain scattering direction and the like of the traditional stray light eliminating means, realize weak reflection, multistage attenuation and strong absorption of visible/near-infrared stray light in a field range, and has the inhibition effect of more than 99%.
The present invention is described in detail below.
The invention relates to a lens cone structure suitable for a bright background imaging condition, which comprises a lens cone body, array type micro-honeycomb holes and a light absorption coating, wherein the array type micro-honeycomb holes are formed in the inner surface of the lens cone body, and the light absorption coating is coated on the annular inner wall of the micro-honeycomb holes, as shown in figures 1 and 2. Strong signal light with target signals enters the optical system through the light shield and the light blocking ring assembly, partial light is scattered by the optical part and the structural part and then enters the inner cavity of the array type micro honeycomb holes in the inner wall of the barrel body of the lens barrel, and the light absorption coating is matched to perform multi-stage attenuation on stray light, so that the suppression effect is more than 99 percent finally realized. The invention designs parameters such as the opening angle, the honeycomb height, the honeycomb aperture, the honeycomb wall thickness and the like of the micro-honeycomb hole structure based on the impedance matching and effective attenuation wave-absorbing electromagnetic theory, and adopts the 3D printing technology to complete the integrated processing of the lens cone and the array type micro-honeycomb hole. Compared with other stray light inhibiting means in the same field, the stray light inhibiting capability of imaging in the field of view is greatly improved.
In the invention, the array type micro-honeycomb holes are arranged in an annular array along the inner surface of the lens cone body, and the opening direction of the single micro-honeycomb hole points to the axis of the lens cone.
In a preferred embodiment, the angle between the opening direction of the array-type microcells and the axial line of the lens barrel is an arbitrary value within the range of +85 ° to +90 °, and the angle is positive in the direction toward the mouth of the lens barrel. The opening angle of the array type micro-honeycomb holes is specifically designed according to the actual positions of optical parts and structural parts in an optical-mechanical system, and the opening directions of the micro-honeycomb holes with different distances from the lens cone opening are not equal to the included angle of the axial lead of the lens cone. Preferably, the closer to the lens barrel opening, the smaller the included angle between the opening direction of the micro-honeycomb holes and the axial lead of the lens barrel; the farther away from the lens barrel opening, the larger the included angle between the opening direction of the micro honeycomb holes and the axial lead of the lens barrel.
In a preferred embodiment, the height of the array type micro-honeycomb holes is 1-2 mm, the center-to-center distance between adjacent micro-honeycomb holes is 0.5-1 mm, and the wall thickness of the micro-honeycomb holes is 0.1-0.2 mm.
In a preferred embodiment, the light absorbing coating is applied to the annular inner wall of the cells of the array microcell in uniform thickness. Fig. 3 shows the light absorption principle of the microstructure in the lens barrel structure design under the bright background imaging condition. When other parts in the lens generate scattering or diffraction phenomena and hit the inner wall of the lens barrel body, light enters the micro-honeycomb cavity, is reflected for multiple times on the inner wall coated with the light absorption coating, is attenuated and absorbed continuously, and finally absorption of the irradiated light is realized.
In the invention, the array type micro honeycomb holes and the lens cone body are integrally designed and processed. Fig. 4 is a flow chart of an integrated 3D printing process of the lens barrel and the array type micro-honeycomb holes in the lens barrel structure design under the bright background imaging condition according to the present invention. Firstly, dispersing a three-dimensional CAD model into layered slices with certain thickness and sequence by using slice software; extracting the profile of each layer of slices through a program, designing a scanning path, speed, laser intensity and the like of the laser according to the profile of the slices, and simultaneously converting the scanning path, the speed, the laser intensity and the like into corresponding computer programs; pumping the laser melting deposition cavity into a vacuum state, and filling certain inert gas. The inert gas is filled to prevent the powder from being oxidized when being melted; fourthly, the powder roller is controlled by a computer program to push the powder from the powder storage chamber to the substrate of the part chamber to form a layer of uniform metal powder; the laser scans under the control of the computer, melt the metal powder laid; sixthly, moving the laser array mirror, the powder roller and the like up (or moving the workbench down) by a slice thickness, repeating the process, and circularly operating in such a way until the shape of the CAD model is formed, and processing the required metal parts.
Examples
The lens cone structure designed by the invention is adopted to implement Tracepro stray light simulation analysis simulation, and simulation analysis is carried out on the solar absorption ratio of the honeycomb structure, the honeycomb height of the array type micro-honeycomb holes in the lens cone structure is 2mm, the center distance of the adjacent micro-honeycomb holes is 0.5mm, the wall thickness of the micro-honeycomb holes is 0.1mm, and the solar absorption rate of the light absorption coating is 0.98%. The included angles between the opening directions of the micro-honeycomb holes with different distances from the lens cone opening and the axial lead of the lens cone are not equal, the included angles gradually change within the range of +85 degrees to +90 degrees, the closer the micro-honeycomb holes are to the lens cone opening, the smaller the included angle between the opening directions of the micro-honeycomb holes and the axial lead of the lens cone is.
Fig. 5 is a diagram of analyzing stray light on the inner wall of the non-honeycomb structure and the inner wall of the honeycomb structure under Tracepro software, and when the incident angle of a light source, the position of the inner wall of a lens barrel and the signal receiving surface of a detector are fixed, the number of light rays received by the signal receiving surface of the detector under the two structures is compared. Simulation analysis verifies that compared with the inner wall without the honeycomb structure, stray light generated by the inner wall of the honeycomb structure has the stray light suppression effect of 99.1 percent, and the suppression effect meets the expected requirement.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (9)
1. The lens cone structure is characterized by comprising a lens cone body, array type micro-honeycomb holes and a light absorption coating, wherein the array type micro-honeycomb holes are formed in the inner surface of the lens cone body, the light absorption coating is coated on the annular inner wall of the micro-honeycomb holes, non-field light entering an optical-mechanical system or secondary stray light generated by an optical part and a structural part in the optical-mechanical system is obliquely incident on the inner wall of the micro-honeycomb holes of the lens cone body, and light reflected in the micro-honeycomb hole cavity is absorbed in multiple stages through the light absorption coating.
2. The lens barrel structure according to claim 1, wherein the array type micro-honeycomb holes are arranged in an annular array along the inner surface of the barrel body, and the opening direction of the single micro-honeycomb hole points to the axis of the lens barrel.
3. The lens barrel structure according to claim 1, wherein the opening direction of the array type micro-honeycomb holes forms an angle of any value in the range of +85 ° to +90 ° with the axial line of the lens barrel, and the angle is positive toward the opening of the lens barrel.
4. The lens barrel structure according to claim 1, wherein the opening directions of the micro-honeycomb holes with different distances from the barrel opening are not equal to the included angle of the barrel axis in the array of micro-honeycomb holes.
5. The lens barrel structure of claim 1, wherein the closer the array of micro-honeycomb holes are to the barrel opening, the smaller the angle between the opening direction of the micro-honeycomb holes and the axial line of the lens barrel; the farther away from the lens barrel opening, the larger the included angle between the opening direction of the micro honeycomb holes and the axial lead of the lens barrel.
6. The lens barrel structure suitable for imaging conditions with bright background as claimed in claim 1, wherein the height of the array type micro-honeycomb holes is 1-2 mm, the center-to-center distance between adjacent micro-honeycomb holes is 0.5-1 mm, and the wall thickness of the micro-honeycomb holes is 0.1-0.2 mm.
7. The lens barrel structure suitable for use under bright background imaging conditions, according to claim 1, wherein said light absorbing coating is applied on the annular inner wall of the array type microcellular holes in uniform thickness.
8. The lens barrel structure suitable for imaging conditions with bright background as claimed in claim 1, wherein the array type micro-honeycomb holes and the barrel body are integrally designed and processed.
9. The lens barrel structure suitable for use under bright background imaging conditions according to claim 8, wherein the processing method of the lens barrel structure comprises the following steps:
s1, dispersing the lens cone and the array type microcellular hole integrated three-dimensional CAD model into layered slices with certain thickness and sequence by adopting slice software;
s2, setting the scanning path, speed and laser intensity of the laser according to the profile of each layer of slice, and converting into corresponding computer program;
s3, vacuumizing the laser melting deposition cavity, and filling inert gas;
s4, sending the powder to the substrate by a program control powder roller to form a layer of uniform metal powder;
s5, scanning the powder under the control of a computer by a laser, and melting the spread powder to finish single slice processing; and (5) performing circulating operation to finish the integrated processing of the lens cone body and the array type micro-honeycomb holes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111566530.9A CN114415312A (en) | 2021-12-20 | 2021-12-20 | Lens cone structure suitable for bright background imaging condition |
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| CN202111566530.9A CN114415312A (en) | 2021-12-20 | 2021-12-20 | Lens cone structure suitable for bright background imaging condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115684045A (en) * | 2022-09-27 | 2023-02-03 | 厦门大学 | Spectrophotometer-based method and system for inherent optical measurement of spherical phaeocystis fuscus capsule |
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| CN115684045A (en) * | 2022-09-27 | 2023-02-03 | 厦门大学 | Spectrophotometer-based method and system for inherent optical measurement of spherical phaeocystis fuscus capsule |
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