CN110830682A - Optical structure for weakening cat eye effect - Google Patents
Optical structure for weakening cat eye effect Download PDFInfo
- Publication number
- CN110830682A CN110830682A CN201810922494.7A CN201810922494A CN110830682A CN 110830682 A CN110830682 A CN 110830682A CN 201810922494 A CN201810922494 A CN 201810922494A CN 110830682 A CN110830682 A CN 110830682A
- Authority
- CN
- China
- Prior art keywords
- double
- lens
- optical
- positive lens
- eye effect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 72
- 241000282326 Felis catus Species 0.000 title claims abstract description 26
- 230000000694 effects Effects 0.000 title claims abstract description 26
- 230000003313 weakening effect Effects 0.000 title abstract description 5
- 230000005499 meniscus Effects 0.000 claims abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000004088 simulation Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002592 echocardiography Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Lenses (AREA)
Abstract
The invention discloses a photosensitive surface inclined optical structure for weakening cat eye effect, which is characterized in that a double convex positive lens L1, a double convex positive lens L1, a double concave negative lens L2, a first double meniscus negative lens L3, a second double meniscus negative lens L4, a double meniscus positive lens L5, a free curved surface and an image surface inclined by 4.5 degrees are sequentially arranged from left to right along an optical axis, wherein the surface of the double convex positive lens L1 facing an image surface is provided with an aspheric surface, the surface of the double concave negative lens L2 faces an object surface, and the surface of the double meniscus positive lens L5 facing an object. And the laser echo simulation is carried out on the system, and the laser detection echo is found to be obviously reduced, so that the invisibility of the cat eye is realized.
Description
Technical Field
The invention belongs to the technical field of optical equipment, and particularly relates to a design method for weakening a cat eye effect.
Background
With the development of times and technologies, various high-performance optical devices are continuously developed and applied to the military fields of reconnaissance, search, measurement, capture, tracking, early warning, communication and the like. Optical systems commonly used in military at present include photoelectric detection systems, optical tracking systems, optical search systems, optical guidance systems, optical fire control systems, optical distance measurement systems and the like. The application of these optical detection techniques in military affairs makes how to hide own equipment and detect optical weapon equipment hidden by found enemies a key point in the military countermeasure field. The characteristics of reconnaissance, counterreconnaissance, stealth and counterstealth also promote the research field to attract a great deal of attention, promote the continuous update of related technologies and expand the application field of the technologies.
When scouting and searching optical equipment of enemy, the researchers in the former Soviet Union, America and France propose that the laser weapon can utilize the cat eye effect principle of the optical equipment to search the optical equipment and photoelectric sensor of the enemy target, determine the position of the enemy target and implement accurate attack. The optical device has a characteristic that an optical window has strong reflection characteristic according to an original light path to incident light, the echo intensity of the optical window is 2-4 orders of magnitude higher than that of a diffuse reflection target, and the characteristic is commonly called a 'cat eye' effect. The laser active detection technology utilizes the characteristic to effectively strike enemy optical equipment. The laser weapon utilizing the cat eye effect develops rapidly, threatens the living space of various optical devices seriously, but how to accomplish "cat eye stealth", that is to say, the laser weapon can not utilize the cat eye effect to survey optical devices, and optical devices do not have strong laser echo, or decay to be the same with the background, and this kind of technological development is slow, and present anti-cat eye is surveyed mainly has following several kinds of modes: the Faraday effect of the magneto-optical rotation crystal is utilized, and the laser echo of the cat eye effect is reduced by the polarization extinction principle. And the echo power of the cat eye target is reduced by adopting a defocusing mode, so that the stealth of the photoelectric equipment is realized. The cat eye effect of the photoelectric equipment is reduced by utilizing the light intensity modulation effect of the circular hole array. However, the above method generally has the problems of reducing the image quality of the system and reducing the energy received by the system.
Disclosure of Invention
The invention provides a design method of an optical system for weakening a cat eye effect on the premise of not reducing the imaging quality and receiving energy of the optical system and not increasing an additional auxiliary device, so that laser active detection equipment cannot detect by using the cat eye effect of optical equipment of one party, and effective stealth of the cat eye system is realized.
In order to achieve the purpose, the invention adopts the technical scheme that:
an optical structure for reducing the cat eye effect is characterized in that a photosensitive surface of an optical system is inclined relative to an optical axis of the optical system, and an optical absorption coating is coated on the inner wall of a lens barrel of the optical system.
Further, the lens comprises a lens barrel, wherein a double convex positive lens L1, a double concave negative lens L2, a first double meniscus negative lens L3, a second double meniscus negative lens L4, a double meniscus positive lens L5 and a photosurface are sequentially arranged in the lens barrel along an optical axis; the photosensitive surface is obliquely arranged in the lens cone, and the inner wall of the lens cone is coated with an optical absorption coating.
Furthermore, the photosensitive surface is obliquely arranged in the lens barrel, and the included angle between the photosensitive surface and the optical axis is 90-4.5 degrees.
Furthermore, the surface of the double convex positive lens L1 facing the photosensitive surface is provided with an aspheric surface, and the surface of the double convex positive lens L5 facing the object surface is provided with a free-form surface.
Further, the double convex positive lens L1 is made of H-BAK4, the double concave negative lens L2 is made of FD4, the first double meniscus negative lens L3 is made of ZBAF1, the second double meniscus negative lens L4 is made of H-LAK3, and the double meniscus positive lens L5 is made of PMMA.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with a common optical system with a non-inclined photosensitive surface, the optical system with the inclined photosensitive surface has the advantages that the laser echo can be obviously weakened, the energy of the laser echo can be weakened by more than 50% relative to the optical system with the non-inclined photosensitive surface, and the invisible effect of the cat eye is realized. The invention creates a precedent for the anti-cat eye detection technology, and the system can detect the optical equipment of the enemy and ensure that the optical equipment of our party cannot be detected.
2. The invention can well correct the aberration problem caused by asymmetry of positive/negative fields on the Y axis due to the inclination of the photosurface by introducing a free-form surface into the double-meniscus positive lens L5.
Drawings
FIG. 1 is a schematic diagram of the cat-eye effect of a generic optical structure;
FIG. 2 is a schematic diagram of the optical structure of the present invention eliminating the cat-eye effect;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
FIG. 4 is a schematic view of a lens and a lens surface according to an embodiment of the invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, it can be known from the laser echo theory that the influence of the parameters of the transmitted laser beam on the echo power is mainly shown in that the echo power of the cat eye target is gradually reduced as the divergence angle of the transmitted laser increases, because the energy characteristic of the far field of the transmitted laser is mainly determined by the divergence angle, the increase of the divergence angle causes the energy of the far field per unit area to be reduced, the effective receiving aperture of the cat eye target is limited, and the echo power is attenuated. It can also be seen that the echo power is inversely proportional to the laser echo divergence angle. Therefore, the divergence angle of the laser echo can be increased, so that the echo power detected by the laser detection device from the cat eye target is weakened, and the stealth is realized.
Most of laser echoes of incident detection laser are reflected to the wall of the lens barrel through the inclined photosensitive surface and are absorbed by the wall of the lens barrel, and the other part of laser echoes are emitted from the optical equipment and deviate from the range of the detection equipment after being transmitted for a certain distance, so that the aim of detecting the laser reflected by the optical equipment is fulfilled.
In fig. 2, comparing the normal optical system and the optical system with the inclined image plane, it can be seen that, for the parallel light beam AB, after incident to the photosensitive surface of the normal optical system and reflected, it can still be emitted in parallel, but after incident to the optical system with the inclined image plane, it is reflected by the inclined image plane, the emitted light is no longer parallel light, and part of the reflected light is reflected to the lens barrel wall and absorbed by the lens barrel wall, thereby reducing the echo.
The basic idea of the invention is that the light-sensitive surface is obliquely arranged in the lens barrel of the optical structure to reflect the laser echo to the barrel wall, and the cat eye effect of the optical system is weakened through the optical absorption coating arranged on the barrel wall.
The present invention corrects for the asymmetric aberrations due to the tilt of the photosurface by placing an XY polynomial free form surface on the double meniscus positive lens L5.
The present invention is described in detail below with reference to a specific embodiment, and the following optical structure example is not intended to limit the scope of the present invention, that is, the adjustment setting of the specific optical structure made by those skilled in the art based on the above-mentioned idea is included in the scope of the present invention.
Example (b):
referring to fig. 3, the present embodiment is composed of a double convex positive lens L1, a double concave negative lens L2, a first double meniscus negative lens L3, a second double meniscus negative lens L4, a double meniscus positive lens L5, and a photosurface, which are arranged in this order from left to right along an optical axis. The biconvex positive lens L1 is provided with an aspheric surface facing an image plane, and the surface of the biconvex positive lens L5 facing an object plane is provided with a free-form surface. Specifically, the double convex positive lens L1 was made of H-BAK4, the double concave negative lens L2 was made of FD4, the first double meniscus negative lens L3 was made of ZBAF1, the second double meniscus negative lens L4 was made of H-LAK3, and the double meniscus positive lens L5 was made of PMMA.
Specific parameters of an exemplary optical structure of this embodiment are shown in fig. 4 and table 1 below:
TABLE 1 optical system configuration parameters for photosurface tilt for reduction of cat-eye effect
The demonstration process of the application feasibility of the optical structure in removing the cat eye effect is as follows:
the anti-cat eye reconnaissance system for the inclination of the photosensitive surface reflects laser echoes to the wall of the lens barrel of the optical equipment, and the wall of the lens barrel is coated with a coating with a high absorption rate, so that light rays reflected to the wall of the lens barrel are absorbed and cannot be emitted out of the system, the echo energy is reduced, and the probability of being detected is reduced.
Meanwhile, the system adopts a design mode of image surface inclination, which is a defocusing mode, and can effectively reduce laser echo and realize the purpose of actively detecting blackening by laser on the premise of not sacrificing imaging quality.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (5)
1. An optical structure for reducing the cat-eye effect, comprising: the photosensitive surface of the optical system is inclined relative to the optical axis of the optical system, and the inner wall of the lens barrel of the optical system is coated with an optical absorption coating.
2. The optical structure for reducing the cat eye effect according to claim 1, comprising a lens barrel in which a double convex positive lens L1, a double concave negative lens L2, a first double meniscus negative lens L3, a second double meniscus negative lens L4, a double meniscus positive lens L5 and a photosurface are disposed in this order along an optical axis; the photosensitive surface is obliquely arranged in the lens cone, and the inner wall of the lens cone is coated with an optical absorption coating.
3. The optical structure for reducing cat-eye effect as claimed in claim 2, wherein said photosensitive surface is obliquely disposed within said lens barrel at an angle of 90-4.5 ° with respect to said optical axis.
4. The optical structure for reducing cat eye effect as claimed in claim 3 wherein said double convex positive lens L1 has an aspheric surface facing the light sensitive surface and a free-form surface facing the object surface of the double meniscus positive lens L5.
5. The optical structure for reducing cat eye effect of claim 4 wherein said double convex positive lens L1 is made of H-BAK4, double concave negative lens L2 is made of FD4, first double meniscus negative lens L3 is made of ZBAF1, second double meniscus negative lens L4 is made of H-LAK3, and double meniscus positive lens L5 is made of PMMA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810922494.7A CN110830682A (en) | 2018-08-14 | 2018-08-14 | Optical structure for weakening cat eye effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810922494.7A CN110830682A (en) | 2018-08-14 | 2018-08-14 | Optical structure for weakening cat eye effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110830682A true CN110830682A (en) | 2020-02-21 |
Family
ID=69547163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810922494.7A Pending CN110830682A (en) | 2018-08-14 | 2018-08-14 | Optical structure for weakening cat eye effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110830682A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687488A (en) * | 2021-08-27 | 2021-11-23 | 山东中科际联光电集成技术研究院有限公司 | Near-infrared wide-spectrum optical lens capable of preventing cat eye effect |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012032760A (en) * | 2010-07-05 | 2012-02-16 | Nikon Corp | Optical system for video projection apparatus and video projection apparatus |
| CN102890334A (en) * | 2012-09-17 | 2013-01-23 | 河南中光学集团有限公司 | Day and night cat eye reconnaissance lens optical system |
| CN105372796A (en) * | 2015-12-07 | 2016-03-02 | 西安工业大学 | Refrigeration type common-caliber medium/long-wave infrared double-waveband double-view-field dual-shift zoom optical system |
| CN106772937A (en) * | 2016-12-19 | 2017-05-31 | 福建福光股份有限公司 | A kind of 50 millimeters of focusing machine visual lens of 8,000,000 pixel |
| CN206224046U (en) * | 2016-11-15 | 2017-06-06 | 无锡市星迪仪器有限公司 | The compound defocus anti-detection device of formula |
| CN206224043U (en) * | 2016-11-15 | 2017-06-06 | 无锡市星迪仪器有限公司 | Double anti-detection devices of glued graticle |
| CN107329226A (en) * | 2017-07-07 | 2017-11-07 | 瑞声科技(新加坡)有限公司 | A kind of lens barrel, the processing method of this kind of lens barrel and lens assembly |
-
2018
- 2018-08-14 CN CN201810922494.7A patent/CN110830682A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012032760A (en) * | 2010-07-05 | 2012-02-16 | Nikon Corp | Optical system for video projection apparatus and video projection apparatus |
| CN102890334A (en) * | 2012-09-17 | 2013-01-23 | 河南中光学集团有限公司 | Day and night cat eye reconnaissance lens optical system |
| CN105372796A (en) * | 2015-12-07 | 2016-03-02 | 西安工业大学 | Refrigeration type common-caliber medium/long-wave infrared double-waveband double-view-field dual-shift zoom optical system |
| CN206224046U (en) * | 2016-11-15 | 2017-06-06 | 无锡市星迪仪器有限公司 | The compound defocus anti-detection device of formula |
| CN206224043U (en) * | 2016-11-15 | 2017-06-06 | 无锡市星迪仪器有限公司 | Double anti-detection devices of glued graticle |
| CN106772937A (en) * | 2016-12-19 | 2017-05-31 | 福建福光股份有限公司 | A kind of 50 millimeters of focusing machine visual lens of 8,000,000 pixel |
| CN107329226A (en) * | 2017-07-07 | 2017-11-07 | 瑞声科技(新加坡)有限公司 | A kind of lens barrel, the processing method of this kind of lens barrel and lens assembly |
Non-Patent Citations (2)
| Title |
|---|
| 蒋治国;樊洋;: "基于减弱"猫眼效应"的隐身技术研究", 激光与红外, no. 08, pages 1 - 6 * |
| 赵勋杰, 高稚允, 张英远: "基于"猫眼"效应的激光侦察技术及其在军事上的应用", 光学技术, no. 04 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687488A (en) * | 2021-08-27 | 2021-11-23 | 山东中科际联光电集成技术研究院有限公司 | Near-infrared wide-spectrum optical lens capable of preventing cat eye effect |
| CN113687488B (en) * | 2021-08-27 | 2023-09-05 | 山东中科际联光电集成技术研究院有限公司 | Near infrared broad spectrum cat eye effect prevention optical lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104267406A (en) | Diffuse reflection laser ranging and high resolution imaging synchronous measurement photoelectric telescope system | |
| CN101299066B (en) | Laser radar transmission type coaxial transmitting and receiving equipment | |
| CN107101536B (en) | Emit laser beam axis and target following parallelism of optical axis control system | |
| US2700318A (en) | Gun muzzle blast azimuth indicator | |
| CA2171786A1 (en) | Electromagnetic energy directing method and apparatus | |
| US6851645B1 (en) | Non-coherent fresnel direction finding method and apparatus | |
| CN106646500A (en) | Self-adaptive closed loop adjustment laser range finding method and device | |
| CN110864587A (en) | Seeker aiming positioning method and aiming positioning system | |
| CN110830682A (en) | Optical structure for weakening cat eye effect | |
| CN206960792U (en) | Laser beam expander and unmanned plane laser snipe system | |
| Chen et al. | The experimental study about laser-induced dizziness effect of medium-wave infrared seeker which based on image processing | |
| Zhang et al. | Design and analysis of laser photoelectric detection sensor | |
| CN111102942B (en) | Laser emission optical axis and tracking system optical axis parallelism real-time correction system and method | |
| US5049741A (en) | Electromagnetic wave shielding system for optical sensor having an aperture | |
| CN207051590U (en) | Laser beam expander and unmanned plane laser snipe system | |
| KR101513542B1 (en) | Optical system | |
| CN115877353A (en) | Receiving optical machine system for laser ranging | |
| CN215067307U (en) | Laser radar transmitting system | |
| CN207300056U (en) | Launch laser beam axis and target following parallelism of optical axis control system | |
| CN107153196A (en) | Laser radar and laser radar control method | |
| GB2565880A (en) | Iso-focus Control System For Emission Laser Light and Target Detection Light | |
| Solanki et al. | Simulation and experimental studies on retro reflection for optical target detection | |
| CN111076679A (en) | Laser and video real-time coaxial correction system and method | |
| Sun et al. | The design of active laser detection system based on nonlinear optical effect | |
| CN215524361U (en) | Optical sighting telescope for reducing laser active reconnaissance threat |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |