WO2019098405A1 - 원거리 감시용 단적외선 카메라 광학계 - Google Patents
원거리 감시용 단적외선 카메라 광학계 Download PDFInfo
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- WO2019098405A1 WO2019098405A1 PCT/KR2017/012973 KR2017012973W WO2019098405A1 WO 2019098405 A1 WO2019098405 A1 WO 2019098405A1 KR 2017012973 W KR2017012973 W KR 2017012973W WO 2019098405 A1 WO2019098405 A1 WO 2019098405A1
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- WIPO (PCT)
- Prior art keywords
- optical system
- lenses
- short
- distance
- infrared
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 36
- 238000012544 monitoring process Methods 0.000 title abstract description 3
- 239000006117 anti-reflective coating Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 2
- 230000004075 alteration Effects 0.000 description 14
- 238000012546 transfer Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010206 sensitivity analysis Methods 0.000 description 3
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 2
- KXNLCSXBJCPWGL-UHFFFAOYSA-N [Ga].[As].[In] Chemical compound [Ga].[As].[In] KXNLCSXBJCPWGL-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/20—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- 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
Definitions
- the present invention relates to a short-distance infrared camera optical system for remote surveillance, and more particularly, to a far infrared camera optical system for long distance surveillance which is more advantageous in image acquisition in a situation where a corrective distance such as a fog is limited because a wavelength is longer than that of a CCD camera or a CMOS camera,
- a corrective distance such as a fog is limited because a wavelength is longer than that of a CCD camera or a CMOS camera
- the far infrared ray includes a wavelength band of infrared rays emitted by humans as light having a wavelength band of 8 to 13 mu m.
- a far infrared ray camera is a camera that can detect an infrared ray generated by a person or an object at night and pick up the image.
- a related prior art is Korean Patent Registration No. 10-1214601 entitled " Non-thermal infrared lens module ".
- the medium infrared refers to an infrared ray having a wavelength band of 3 to 8 mu m.
- the mid-infrared wavelength band is mainly used for missile seekers because it is advantageous for high temperature target detection. It may also refer to an infrared ray of 3 to 5 ⁇ m which is used as a waiting window for thermal imaging equipment.
- LWIR far infrared
- MWIR medium infrared
- An object of the present invention is to provide a short-distance infrared camera optical system for distant surveillance capable of acquiring an image even in a situation where the focal distance and the like are limited.
- an image pickup apparatus including lenses (L1 to L7) arranged in a plurality of lines along an optical axis, the lenses (L1 to L7) receiving a wavelength band of 0.9 to 1.7 mu m, And the lens L7 adjacent to the lens L7 moves along the optical axis to correct the defocus caused when the object changes its distance and changes its temperature.
- the front and rear surfaces of the lenses L1 to L7 may be formed as spherical surfaces, respectively.
- the lenses L1 to L7 may be anti-reflective coating (AR coating).
- AR coating anti-reflective coating
- the wavelength is longer than that of a CCD camera or a CMOS camera used in a visible light region, it is more advantageous when acquiring an image in a situation where a corrective distance such as a fog is limited.
- illumination is performed with a laser beam in a short infrared wavelength region, Also, since it is possible to acquire images at low visibility, it provides the optimal image equipment capable of acquiring day and night images at low visibility.
- the optical system of the present invention is mounted on a laser interceptor, it is possible to detect, track, and intercept a dron above the front that is infiltrated from the enemy.
- Fig. 1 is a diagram showing a far-infrared camera optical system for a distance surveillance of the present invention.
- MTF modulation transfer function
- the far-infrared camera optical system for long distance monitoring of the present invention includes lenses L1 to L7 arranged in a plurality of lines along the optical axis.
- Reference numeral D denotes a detector for detecting an image from light received by the lenses L1 to L7.
- the lenses L1 to L7 receive the short-wave infrared (SWIR) light so that the necessary images can be acquired even when the focal distance and the like are limited. That is, the lenses L1 to L7 receive the short infrared rays (SWIR) in the wavelength band of 0.9 to 1.7 mu m so that the detector D can acquire the necessary image.
- SWIR short-wave infrared
- SWIR is an excellent contrast for imaging that requires higher resolution as the principle is that the photons are reflected and absorbed from the object.
- the lenses L1 to L7 receive the short infrared rays SWIR so that the detector D can acquire a necessary image.
- the detector (D) has an Indium Gallium Arsenide (InGaAs) image sensor of 640 ⁇ 512 arrangement available in the short infrared (SWIR) band of 0.9 to 1.7 ⁇ m wavelength.
- InGaAs Indium Gallium Arsenide
- the field of view is 1.83 DEG x 1.47 DEG
- the 1-pixel size of the detector D is 15 mu m
- the detection plane is 6.60 x 512
- the size of the image is 7.68 mm
- the instantaneous field of view (IFOV) at a moment when one pixel is viewed has a value of 0.1 mrad.
- the limit resolution of the infrared optical system is determined by the detector (D), and the F-number of the optical system of the present invention is 4.0 in order to satisfy the limit resolution.
- the number of F-numbers is determined in consideration of the size of the airy disk determined by the optical system specifications.
- the optical system of the present invention it is possible to adjust the focus regardless of the position of the object in the infinite range from the minimum object distance of 20m, and the lens L7 is fine-shifted by the object distance to change to auto focus, Defocus caused when the object distance changes and the temperature changes also moves the lens L7 finely to secure the performance.
- the lenses L1 to L7 may be formed by mixing a crown material and a flint material and AR coating (Anti-Reflective Coating) to minimize a transmittance drop to a wavelength of 0.9 to 1.7 mu m.
- the lenses L1 to L7 may be formed as spheres on both the front surface facing the object and the rear surface facing the detector D, thus ensuring ease of fabrication and alignment.
- the focusing lens L7 is formed to be light in weight compared to the other lenses L1 to L6, thereby facilitating the movement.
- Table 2 shows the radius of curvature (Radius) of the preferred lenses L1 to L7.
- the modulation transfer function (MTF) is a standardized value indicating how clearly the optical module transmits the image information of the object when the object is viewed through the optical system.
- FIG. 2 is a graph showing a modulation transfer function (MTF) at an object distance infinite.
- the spatial frequency is determined according to the pixel size of the detector (D), and the performance can be checked by checking the modulation transfer function (MTF) result at the corresponding frequency.
- MTF modulation transfer function
- the maximum performance that an optical system can have is referred to as the diffraction limit and is indicated by a dotted line in the figure.
- the beam diameter represents the size of the light beam incident on each pixel, and the smaller the beam diameter, the smaller the aberration and the higher the modulation transfer function (MTF) performance.
- the design is made based on the 2-pixel size based on the maximum detector (D) so that all the rays incident on the detector D through the lenses L1 to L7 are converged in the 2-pixel pitch .
- the reason for determining the beam diameter and modulation transfer function (MTF) performance as a pixel size is that it is the minimum unit that can be decomposed in the detector (D) and has different target modulation transfer function (MTF) performance depending on the 1-pixel size .
- a spot diagram at an object distance of 50 m and an object distance of 20 m was analyzed for the optical system of the present invention. As a result, it was confirmed that the optical system of the present invention was all condensed in 2-pixels, The modulation transfer function (MTF) is slightly lower when the beam diameter is larger.
- MTF modulation transfer function
- the optical aberration graph approaches zero (ZERO) as the ideal lens, and the optical performance becomes better if the slope of the other two wavelengths is canceled according to the characteristic of the wavelength.
- ZERO zero
- the distortion aberration represents a nonlinear change in the ideal image height of the aberration optical system and the actually designed optical system.
- the distortion aberration increases, the shape of the upper surface is distorted and becomes different from that of the detection surface.
- This distortion aberration is frequently observed in a wide angle camera, and the distortion aberration at an object distance of 50M and an object distance of 20M is analyzed for an optical system of the present invention, the object distance is infinite.
- the distortion aberration magnitude is about 0.0035%, which is not the magnitude of distortion aberration which can be felt by the user when photographing the image and photograph, and the result predicted in actual image acquisition through the 2-d image simulation It was confirmed to be unreasonable even when compared with the original.
- the tolerance analysis is to analyze the performance deterioration that may occur when assembling or fabricating an optical system designed theoretically through sensitivity analysis in advance, and it is necessary to preliminarily apply an error that may occur when manufacturing and assembling the lens system artificially, To predict the performance change.
- the sensitivity analysis is used to analyze the error tolerance range, to improve the sensitivity of the optical system by enhancing the production yield and the target performance by complementing the sensitive part.
- the yield of the optical system according to the present invention is analyzed through the sensitivity analysis. Items of analysis include curvature, refractive index, thickness, surface shape, and center. Sensitivity was analyzed through various items such as tilt, tilt, group tilt, group di center.
- the optical system of the present invention since the optical system of the present invention has a longer wavelength than the CCD camera or CMOS camera used in the visible light ray region, it is more advantageous when capturing an image in a situation where the focal distance and the like are limited, and the laser beam in the short infrared wavelength region It is possible to acquire images at low visibility even at night, so that it is possible to provide an optimal image equipment capable of acquiring day and night images at low visibility.
- the optical system of the present invention is mounted on a laser interceptor, it is possible to detect, track, and intercept a dron above the front that is infiltrated from the enemy.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Studio Devices (AREA)
Abstract
Description
스펙트럼 레인지(Spectral Range) | 0.9 ~ 1.7㎛ |
유효초점거리(Effective Focal Length) | ≥300.0mm |
초점 범위(Focus Range) | 20m ~ 무한대 @ 와이드(20m ~ Infinity @ Wide) |
F-수(F-number) | 4.0 |
시야각 @ 무한대(Field of View @ Infinity ) | ≥1.83°×1.47° |
순간시야각 @ 무한대(Instantaneous Field of View @ Infinity ) | ≤0.1mrad |
픽셀 포멧(Pixel format) | 640×512 픽셀(15㎛ 피치)(640×512 pixels(15㎛ pitch)) |
구 분 | 표면 타입(Surface Type) | 곡률반경(Radius)[mm] | |
L1 | 전면 | 구면(Sphere) | 700.00 |
후면 | 구면(Sphere) | 115.41 | |
L2 | 전면 | 구면(Sphere) | 141.03 |
후면 | 구면(Sphere) | -155.04 | |
L3 | 전면 | 구면(Sphere) | -134.29 |
후면 | 구면(Sphere) | -552.32 | |
L4 | 전면 | 구면(Sphere) | 217.23 |
후면 | 구면(Sphere) | 362.17 | |
L5 | 전면 | 구면(Sphere) | 188.39 |
후면 | 구면(Sphere) | 93.62 | |
L6 | 전면 | 구면(Sphere) | 103.10 |
후면 | 구면(Sphere) | -144.58 | |
L7 | 전면 | 구면(Sphere) | -278.89 |
후면 | 구면(Sphere) | 199.51 |
Claims (3)
- 광축을 따라 다수개로 배열된 렌즈들(L1 내지 L7)을 포함하며,상기 렌즈들(L1 내지 L7)은 0.9 ~ 1.7㎛ 파장대역을 수광하며,검출기(D)와 인접한 상기 렌즈(L7)가 광축을 따라 이동하며 상기 물체의 거리 변화 및 온도 변화시 발생되는 디포커스를 보정하는 것을 특징으로 하는 원거리 감시용 단적외선 카메라 광학계.
- 제1항에 있어서,상기 렌즈들(L1 내지 L7)은 전면 및 후면이 각각 구면으로 형성되는 것을 특징으로 하는 원거리 감시용 단적외선 카메라 광학계.
- 제1 항에 있어서,상기 렌즈들(L1 내지 L7)은 AR코팅(Anti-Reflective Coating)된 것을 특징으로 하는 원거리 감시용 단적외선 카메라 광학계.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR10-2017-0152228 | 2017-11-15 | ||
KR1020170152228A KR102209218B1 (ko) | 2017-11-15 | 2017-11-15 | 원거리 감시용 단적외선 카메라 광학계 |
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Publication Number | Publication Date |
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WO2019098405A1 true WO2019098405A1 (ko) | 2019-05-23 |
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PCT/KR2017/012973 WO2019098405A1 (ko) | 2017-11-15 | 2017-11-16 | 원거리 감시용 단적외선 카메라 광학계 |
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KR (1) | KR102209218B1 (ko) |
WO (1) | WO2019098405A1 (ko) |
Cited By (1)
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CN113759355A (zh) * | 2021-09-09 | 2021-12-07 | 四川虹美智能科技有限公司 | 基于红外数据的测距方法和装置 |
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KR20210065665A (ko) | 2019-11-27 | 2021-06-04 | (주)토핀스 | 안개투과 효과를 증대시키는 단적외선 카메라 광학계 |
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KR101031876B1 (ko) * | 2010-11-08 | 2011-05-02 | 엘아이지넥스원 주식회사 | 줌 렌즈 광학계 |
WO2011155757A2 (ko) * | 2010-06-07 | 2011-12-15 | 파워옵틱스 주식회사 | 엘이디 조명 광학 시스템 |
WO2015023083A1 (ko) * | 2013-08-12 | 2015-02-19 | 주식회사 소모홀딩스엔테크놀러지 | 원적외선 카메라용 광각 렌즈 |
KR101506186B1 (ko) * | 2014-03-05 | 2015-03-26 | 삼성탈레스 주식회사 | 광대역 적외선 렌즈 어셈블리 및 광학계 |
WO2017164607A1 (ko) * | 2016-03-22 | 2017-09-28 | 주식회사 에이스솔루텍 | 렌즈 광학계 및 촬상 장치 |
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KR101214601B1 (ko) | 2012-07-23 | 2012-12-21 | (주)토핀스 | 비열화 적외선 렌즈모듈 |
US9485439B2 (en) * | 2013-12-03 | 2016-11-01 | Sensors Unlimited, Inc. | Shortwave infrared camera with bandwidth restriction |
KR101841200B1 (ko) | 2015-05-28 | 2018-03-23 | (주)토핀스 | 냉각 열화상카메라 중적외선 10배율 연속줌 광학계 |
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- 2017-11-15 KR KR1020170152228A patent/KR102209218B1/ko active IP Right Grant
- 2017-11-16 WO PCT/KR2017/012973 patent/WO2019098405A1/ko active Application Filing
Patent Citations (5)
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WO2011155757A2 (ko) * | 2010-06-07 | 2011-12-15 | 파워옵틱스 주식회사 | 엘이디 조명 광학 시스템 |
KR101031876B1 (ko) * | 2010-11-08 | 2011-05-02 | 엘아이지넥스원 주식회사 | 줌 렌즈 광학계 |
WO2015023083A1 (ko) * | 2013-08-12 | 2015-02-19 | 주식회사 소모홀딩스엔테크놀러지 | 원적외선 카메라용 광각 렌즈 |
KR101506186B1 (ko) * | 2014-03-05 | 2015-03-26 | 삼성탈레스 주식회사 | 광대역 적외선 렌즈 어셈블리 및 광학계 |
WO2017164607A1 (ko) * | 2016-03-22 | 2017-09-28 | 주식회사 에이스솔루텍 | 렌즈 광학계 및 촬상 장치 |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN113759355A (zh) * | 2021-09-09 | 2021-12-07 | 四川虹美智能科技有限公司 | 基于红外数据的测距方法和装置 |
CN113759355B (zh) * | 2021-09-09 | 2023-04-28 | 四川虹美智能科技有限公司 | 基于红外数据的测距方法和装置 |
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KR102209218B1 (ko) | 2021-01-29 |
KR20190055862A (ko) | 2019-05-24 |
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