CN103823296B - A kind of Color Night Vision System based on Philips type prism - Google Patents
A kind of Color Night Vision System based on Philips type prism Download PDFInfo
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Abstract
The invention discloses a kind of Color Night Vision System based on Philips type prism, comprising: for natural light being converted to the Polarization converter of S polarized light; S polarized light for being exported by Polarization converter is divided into the color separation Philips type prism of blue light, green glow, ruddiness; For the first image intensifier that blue light is carried out strengthening; The second image intensifier strengthened is carried out for ruddiness; For the 3rd image intensifier that green glow is carried out strengthening; Blue light, the ruddiness of the second image intensifier enhancing and the green glow of the 3rd image intensifier enhancing for being strengthened by the first image intensifier carry out closing the conjunction color component of look; And, the light signal closing color component output is converted into the imaging device of image.The Color Night Vision System that the present invention is based on Philips type prism can restore coloured image under night-environment and poor light condition, and improve image quality, picture quality is good, is conducive to utilization and extention, possesses wide application prospect.
Description
Technical field
The present invention relates to Color Night Vision System field, be specifically related to a kind of Color Night Vision System based on Philips type prism.
Background technology
The development of lll night vision starts from 1936, it is a technical skill of the research enhancing of weak image signal, conversion, transmission, storage, process, be divided into direct viewing systems and a viewing system two kinds, direct viewing systems is called low-light level night vision device, and it is that starlight, moonlight and the airglow utilizing target to reflect strengthens a kind of night vision instrument reaching human eye and can carry out observing by image intensifier.Militarily, Low-light Level Night Vision Technology has been practically applicable to investigation at night, aiming, vehicle drive, electro-optical fire control and other battlefield operation, and can with the combine with technique such as infrared, laser, radar, form the investigation of complete photoelectricity, measure and warning system.
Night vision system is a kind of image enhaucament apparatus.The radiant light that image enhaucament apparatus collecting ring border is launched, particularly a small amount of visible light and infrared radiation, and make it amplify, be can by the ambient image of human eye institute perception with what make output.Light signal in the efferent office from image enhaucament apparatus by pen recorder institute record, can be presented in external monitor, or directly can be seen by observer.Under the occasion of the latter, image enhaucament apparatus to be used in by people be worn in night vision eyepiece on head or binocular, be directly delivered to human eye to make exporting light signal.
Night vision system is divided into monochrome night vision system and Color Night Vision System usually.
Common night vision system is monochrome night vision system, and adopting monochromatic output, is generally amplified together by the light of white light or all colours, uses green fluorescence screen, produces monochromatic display.But relative to monochrome display, in various monitoring field, coloured image is more easily identified.
Color Night Vision System, by effectively extracting multiband, multi-sensor image information, forms unified color night vision image, makes observer rely on difference in brightness, color distinction can be relied on again simultaneously to differentiate and identify scene and target.Existing Color Night Vision System adopts single channel color night vision technology usually.Traditional single channel low-light level imaging detection system is primarily of the part such as optical system and low-light level imaging detector composition, the image obtained by it is gray level image, and single channel color night vision technology improves on the basis of conventional one-channel low-light level imaging detection system.Single channel color night vision device only needs an optical channel and an imaging band, thus, have that formation is simply compact, stable performance, lightweight, cost is low, without the need to advantages such as registrations, but its image quality is not high.
Publication number is CN101446681A(application number is 200810051438.7) Chinese invention patent application disclose a kind of low-temperature CCD low-light level night vision device, be made up of CCD, prime amplifier, by prime amplifier the charge signal exported from CCD be converted into voltage signal and amplify, CCD is by the low temperature of refrigerator refrigerate to-5 ~-15 DEG C, and refrigerator intensification side contacts with heating radiator; Between CCD and prime amplifier, add charge amplifier, amplify the charge signal from CCD output and be transferred to prime amplifier.When scene illumination is lower, need to improve enlargement factor, final video picture noise will be caused to increase, image quality declines, and this technical scheme reduces video picture noise by low temperature, improves image quality.But this technical scheme is not still improved optical system, still adopt an existing optical channel, image is still monochromatic display, and its effect is of low quality.
Summary of the invention
The invention provides a kind of Color Night Vision System based on Philips type prism that can be used under night or poor light condition, picture quality is good.
Based on a Color Night Vision System for Philips type prism, comprising:
For natural light being converted to the Polarization converter of S polarized light;
S polarized light for being exported by Polarization converter is divided into the color separation Philips type prism of blue light, green glow, ruddiness;
Blue light for being exported by color separation Philips type prism carries out the first image intensifier strengthened;
Ruddiness for being exported by color separation Philips type prism carries out the second image intensifier strengthened;
Green glow for being exported by color separation Philips type prism carries out the 3rd image intensifier strengthened;
Blue light, the ruddiness of the second image intensifier enhancing and the green glow of the 3rd image intensifier enhancing for being strengthened by the first image intensifier carry out closing the conjunction color component of look;
And, the light signal closing color component output is converted into the imaging device of image.
Natural light is converted into S polarized light through Polarization converter, incides in color separation Philips type prism, is divided into the light of R, G, B three primary colours, namely exports ruddiness (R light), green glow (G light), blue light (B light) respectively.B light enters in the first image intensifier, from the output terminal outgoing of the first image intensifier after B light is strengthened by the first image intensifier, finally enters and closes in color component; R light enters to inject in the second image intensifier, and the R light after enhancing incides and closes color component after the second image intensifier output terminal outgoing; G light enters the 3rd image intensifier to be strengthened, and the G light after enhancing, from the output terminal outgoing of the 3rd image intensifier, directly enters into and closes color component, R light after strengthening with other two-way and the photosynthetic look of B, export from the exit facet closing color component, incide on imaging device, become coloured image.
As preferably, described color separation Philips type prism comprises the first lens of being coated with anti-blue saturating red green dichroic coating and is coated with counter the second lens being popular in blue-green dichroic coating, wherein, S polarized light is introduced in the first lens, S polarized light is divided into reflected light and transmitted light two parts by the saturating red green dichroic coating of the anti-indigo plant on the first lens, reflected light is blue light, transmitted light is red-green glow, enter in the second lens after transmitted light (red-green glow), transmitted light (red-green glow) is divided into reflected light and transmitted light two parts by the anti-blue-green dichroic coating that is popular on the second lens, reflected light is ruddiness, transmitted light is green glow.Therefore, natural light is converted into S polarized light through Polarization converter, incides in color separation Philips type prism, is divided into the light of R, G, B three primary colours.The saturating red green dichroic coating of anti-indigo plant and the anti-blue-green dichroic coating that is popular in are realized by the light of cut-off different wave length, the wavelength of ruddiness is 620nm ~ 760nm, the wavelength of green glow is 495nm ~ 570nm, the wavelength of blue light is 450nm ~ 490nm, as anti-blue saturating red green dichroic coating can end the light of below 493nm wavelength, the anti-light being popular in blue-green dichroic coating and can ending more than 610nm wavelength.
Further preferably, on the second lens in described color separation Philips type prism, the anti-blue-green dichroic coating side that is popular in is connected with green glow exit lens, green glow exit lens, in order to allow the green glow of outgoing, is mated with the ruddiness of reflection, the light path of blue light, is ensured only horizontal exit.
As preferably, the first described image intensifier, the second image intensifier and the 3rd image intensifier are gleam image intensifier, as specifically selected cascade image intensifier.
As preferably, described conjunction color component is X-Cube color-combination prism or by anti-blue saturating red green optical filter (BDM optical filter) be instead popular in the conjunction color component or conjunction look Philips type prism that bluish-green optical filter (RDM optical filter) square crossing formed.
Further preferably, described X-Cube color-combination prism comprises: anti-red and anti-blue face of square crossing mutually, wherein, the blue light strengthened through the first image intensifier is penetrated from described X-Cube color-combination prism by anti-blue face reflection, the ruddiness strengthened through the second image intensifier is penetrated from described X-Cube color-combination prism by anti-red reflection, and the green glow strengthened through the 3rd image intensifier is penetrated from described X-Cube color-combination prism by anti-red and anti-blue face.
Further preferably, described conjunction color component is by anti-blue saturating red green optical filter (BDM optical filter) and the anti-conjunction color component being popular in bluish-green optical filter (RDM optical filter) square crossing and being formed, wherein, the blue light strengthened through the first image intensifier reflects from described conjunction color component injection by anti-blue saturating red green optical filter, the ruddiness strengthened through the second image intensifier is popular in the reflection of bluish-green optical filter from the injection of described conjunction color component by counter, and the green glow strengthened through the 3rd image intensifier is popular in bluish-green optical filter and anti-blue saturating red green optical filter penetrates from described conjunction color component by counter.
Further preferably, described conjunction look Philips type prism comprises the first lens of being coated with anti-blue saturating red green dichroic coating and is coated with counter the second lens being popular in blue-green dichroic coating, wherein, the blue light strengthened through the first image intensifier is penetrated from described conjunction look Philips type prism by the saturating red green dichroic coating reflection of the anti-indigo plant on the first lens, the ruddiness strengthened through the second image intensifier reflects from described conjunction look Philips type prism injection by the anti-blue-green dichroic coating that is popular on the second lens, the anti-saturating red green dichroic coating of anti-indigo plant being popular in blue-green dichroic coating and the first lens that green glow through the 3rd image intensifier enhancing passes the second lens penetrates from described conjunction look Philips type prism.
Further preferred, on the second lens in described conjunction look Philips type prism, the anti-blue-green dichroic coating side that is popular in is connected with green glow entrance lens, green glow entrance lens, in order to allow incident green glow, mates with the light path of ruddiness, blue light, ensures only glancing incidence.
As preferably, described imaging device is CCD(charge coupled cell) imaging device or COMS(ComplementaryMetal-OxideSemiconductor, Complimentary Metal-Oxide semiconductor) imaging device, CCD imaging device and COMS imaging device all can adopt prior art, namely the light signal closing color component output receives through ccd image sensor or COMS imageing sensor, obtains coloured image after then carrying out follow-up signal process further.
As preferably, in the described Color Night Vision System based on Philips type prism, light path turns to and adopts catoptron, right-angle prism or curved fiber bundle, and catoptron, right-angle prism or curved fiber bundle can realize turning to of light path well.
Compared with prior art, tool of the present invention has the following advantages:
The present invention is based on the Color Night Vision System of Philips type prism, natural light is converted into S polarized light through Polarization converter, S polarized light is divided into the light of B, G, R tri-kinds of primary colours through color separation Philips type prism, the light of B, G, R tri-kinds of primary colours is input to after strengthening through the first image intensifier, the 3rd image intensifier, the second image intensifier respectively and closes in color component, on imaging device, form coloured image after closing look, improve picture quality.
The Color Night Vision System that the present invention is based on Philips type prism can restore coloured image under night-environment and poor light condition, and improve image quality, picture quality is good, is conducive to utilization and extention, possesses wide application prospect.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Color Night Vision System based on Philips type prism of the embodiment of the present invention 1;
Fig. 2 is the structural representation of the Color Night Vision System based on Philips type prism of the embodiment of the present invention 2;
Fig. 3 is the structural representation of the Color Night Vision System based on Philips type prism of the embodiment of the present invention 3;
Fig. 4 is the structural representation of the Color Night Vision System based on Philips type prism of the embodiment of the present invention 4;
Fig. 5 is the structural representation of the Color Night Vision System based on Philips type prism of the embodiment of the present invention 5;
1, Polarization converter, 2, color separation Philips type prism, the 3, first catoptron, 4, the first image intensifier, 5, the second catoptron, the 6, the 3rd catoptron, the 7, second image intensifier, 8, the 4th catoptron, 9, the 3rd image intensifier, 10, X-Cube color-combination prism, 11, CCD, 12, the first right-angle prism, 13, the second right-angle prism, 14,15,16 is curved fiber bundle, 17 is BDM optical filter, and 18 is RDM optical filter, and 19 for closing look Philips type prism, wherein 19-1 is anti-blue saturating red green dichroic coating, and 19-2 is popular in blue-green dichroic coating for counter.
Embodiment
For a better understanding of the present invention, below in conjunction with embodiment accompanying drawing, the invention will be further described.
Embodiment 1
As shown in Figure 1, for the present invention is based on the Color Night Vision System of Philips type prism, comprise Polarization converter (PCS) 1, color separation Philips type prism 2, first catoptron 3, first image intensifier 4, second catoptron the 5, three catoptron 6, second image intensifier 7,4th catoptron the 8, three image intensifier 9, X-Cube color-combination prism 10 and CCD11.Color separation Philips type prism 2 comprises the first lens of being coated with anti-blue saturating red green dichroic coating 2-1 and is coated with counter the second lens being popular in blue-green dichroic coating 2-2, namely the 2-1 face of Philips type prism is coated with anti-blue saturating red green dichroic coating, 2-2 face is coated with instead is popular in blue-green dichroic coating, and on the second lens in color separation Philips type prism, the anti-blue-green dichroic coating 2-2 side that is popular in is connected with green glow exit lens.X-Cube color-combination prism comprises: an anti-red 10-2 of square crossing mutually and anti-blue face 10-1, namely the 10-1 face of X-Cube color-combination prism 10 is anti-blue face, and 10-2 face is anti-red.Natural light is converted into S polarized light through Polarization converter 1, incide on the anti-blue saturating red green dichroic coating in 2-1 face in color separation Philips type prism 2 and be divided into reflection and transmission two parts, wherein blue light (B light) is reflected, red and green light is transmitted, B light is reflected on 2-3 face, transmits prism after being totally reflected; The redness of transmission and green light incide that 2-2 face is counter is popular on blue-green spectro-film, again be divided into reflection and transmission two parts, wherein red light (R light) is reflected, the directly transmission of green light (G light), R light transmits prism after being reflected into and being mapped to the full transmitting of generation on 2-1 face, the G light of transmission directly transmits prism, and now, the S polarized light inciding color separation Philips type prism 2 is divided into R, G, B three primary colours.B light incides on the first catoptron 3, reflected light enters in the first image intensifier 4, by the output terminal outgoing of the first image intensifier 4 after brightness is enhanced, to incide on the second catoptron 5 secondary reflection more laggard enter in X-Cube color-combination prism 10, incide on the anti-blue face of 10-1, the B light of S polarization state is reflected; R light incides on the 3rd catoptron 6, enter the second image intensifier 7 after reflection, the light after enhancing incides the 4th catoptron 8 after the second image intensifier 7 output terminal outgoing, enters in X-Cube color-combination prism 10 after being reflected, incide on anti-red of 10-2, the R light of S polarization state is reflected; G light enters the 3rd image intensifier 9 to be strengthened, light after enhancing is from the output terminal outgoing of the 3rd image intensifier 9, directly enter into X-Cube color-combination prism 10, R light after strengthening with other two-way and the photosynthetic look of B, export from the exit facet of X-Cube color-combination prism 10, incide on CCD11, become coloured image.Wherein, catoptron and incident ray are 45 ° of angles, mainly play steering-effecting, are used for changing the direction of propagation of light.
Embodiment 2
As shown in Figure 2, for the present invention is based on the Color Night Vision System of Philips type prism, replacing the second catoptron 5, the 4th catoptron 8 in embodiment 1 respectively with the first right-angle prism 12, second right-angle prism 13, realizing turning to of light in light path.Natural light is converted into S polarized light through Polarization converter (PCS) 1, the Philips type that is split prism 2 is divided into R, G, the light of B tri-kinds of primary colours, the B light wherein gone out from prism transmission incides the first catoptron 3, light after reflection enters the first image intensifier 4 to be strengthened, from a right-angle surface incidence of the first right-angle prism 12 after the output terminal outgoing of the first image intensifier 4, incide on the inclined-plane of the first right-angle prism 12, incident angle is 45 °, be greater than critical angle, therefore, B light is totally reflected on the inclined-plane of the first right-angle prism 12, export from another right-angle surface of the first right-angle prism 12 afterwards, enter in X-Cube color-combination prism 10, R light goes out to be radiated at the 3rd catoptron 6 from prism transmission, entered the second image intensifier 7 by the light reflected to strengthen, enter the second right-angle prism 13 from the light of the second image intensifier 7 output terminal outgoing, the inclined-plane of the second right-angle prism 13 is totally reflected, emergent ray enters in X-Cube color-combination prism 10, with the G light strengthened through the 3rd image intensifier 9, strengthen after the photosynthetic look of B export, incide on CCD11 or CMOS, become colored true picture.
The embodiment of the present invention 2 can be understood as, and the first right-angle prism 12, second right-angle prism 13 effect is and turns to prism, replaces the second catoptron 5 in Fig. 1 embodiment and the 4th catoptron 8; The first catoptron 3 in Fig. 1 and the 3rd catoptron 6 also can replace with right-angle prism.Incident ray with turn to the fully reflecting surface angle of right-angle prism to be 45 °.
Embodiment 3
As shown in Figure 3, for the present invention is based on the Color Night Vision System of Philips type prism, adopt bend light rays bundle 14,15,16, other are with embodiment 1.Natural light is converted to S polarized light through Polarization converter (PCS) 1, enters the light that light splitting Philips type prism 2 is divided into B, G, R tri-kinds of primary colours, and strengthens respectively by the first image intensifier the 4, three image intensifier 9, second image intensifier 7.B light is through the first image intensifier 4, and the light exported from the first image intensifier 4 enters bend light rays bundle 14, propagates into output terminal, enter X-Cube color-combination prism 10 in bend light rays bundle 14 with total reflection form; R light enters curved fiber bundle 15 and is transmitted to X-Cube color-combination prism 10 after the second image intensifier 7 strengthens; G light is entered curved fiber bundle 16 after being strengthened by the 3rd image intensifier 9 and conducts, and enter X-Cube color-combination prism 10, R light, the photosynthetic look of B with after enhancing, incide on CCD11/CMOS detector and become coloured image.
Embodiment 4
As shown in Figure 4, for the present invention is based on the Color Night Vision System of Philips type prism, closing color component is by anti-blue saturating red green optical filter (BDM optical filter) 17 and the anti-conjunction color component being popular in bluish-green optical filter (RDM optical filter) 18 square crossings and being formed, wherein 17 is BDM optical filter, the saturating red green optical filter of anti-indigo plant, 18 is RDM optical filter, is instead popular in bluish-green optical filter.The X-Cube color-combination prism 10 in above-described embodiment 1 is replaced with BDM optical filter 17 and RDM optical filter 18.Specific implementation process is: natural light is converted to S polarized light through Polarization converter (PCS) 1, enters the light that light splitting Philips type prism 2 is divided into R, G, B tri-kinds of primary colours.B light enters the first image intensifier 4 through the first catoptron 3 reflection to be strengthened, and the light after enhancing incides on BDM optical filter 17 after the second catoptron 5 reflects, and BDM optical filter 17 is anti-blue saturating red green spectro-film, and therefore B light is reflected; Reflect through the 3rd catoptron 6 after the R light outgoing that light splitting Philips type prism 2 is separated, enter the second image intensifier 7 to strengthen, light after enhancing incides on the 3rd catoptron 8, incide on RDM optical filter 18 after reflection, RDM optical filter 18 is popular in bluish-green spectro-film for counter, therefore R light is reflected, closing look with the G light of B light and direct transmission (green glow namely strengthened through the 3rd image intensifier 9 is popular in bluish-green optical filter 18 and anti-blue saturating red green optical filter 17 penetrates from closing color component by counter), inciding on CCD11 or COMS and becoming coloured image.
Embodiment 5
As shown in Figure 5, for the present invention is based on the Color Night Vision System of Philips type prism, adopt the X-Cube color-combination prism 10 closed in look Philips type prism 19 alternative embodiment 1, close look Philips type prism 19 comprise the first lens of being coated with anti-blue saturating red green dichroic coating 19-1 and be coated with counter the second lens being popular in blue-green dichroic coating 19-2, close the anti-blue-green dichroic coating 19-2 side that is popular on the second lens in look Philips type prism 19 and be connected with green glow entrance lens.19-1 face is coated with anti-blue saturating red green dichroic coating, and 19-2 face is coated with instead is popular in blue-green dichroic coating.Natural light is converted to S polarized light through polarization converter (PCS) 1, S polarized light is divided into the light of R, G, B three primary colours by color separation Philips type prism 2, wherein, B light enters the first image intensifier 4 after being reflected by the first catoptron 3 to be strengthened, B light after enhancing incides on the second catoptron 5, incides and closes in look Philips type prism 19,19-3 face occurs full transmitting after reflection, reflected light incides on the anti-blue saturating red green spectro-film of 19-1, is again reflected; The R light of light splitting Philips type prism 2 outgoing incides on the 3rd catoptron 6, enter the second image intensifier 7 after reflection to strengthen, incide the 4th catoptron 8 from the light of the second image intensifier 7 output face outgoing, light after reflection enters and closes in look Philips type prism 19, be totally reflected, reflected light incides counter being popular on bluish-green spectro-film of 19-2 and again reflects; G light is directly incident in conjunction light Philips type prism 19 after being strengthened by the 3rd image intensifier 9, mix with R light through 19-2 face, mixed red-green glow mixes with B light again through 19-1 face, therefore, become R, G, B from the light closing the outgoing of light Philips type prism 19 and close the white light after look, incide on CCD11 or cmos imaging device, become colored true picture.
The present embodiment can be understood as, light splitting Philips type prism 2 is used for incident light to be divided into R, G, B three primary colours, and after using image intensifier to strengthen respectively, incide to close in light Philips type prism 19 and close look, replace X-Cube color-combination prism 10 or RDM optical filter 18 and BDM optical filter 17 with conjunction light Philips type prism 19 in the present embodiment, play and close look effect.
Claims (4)
1. based on a Color Night Vision System for Philips type prism, it is characterized in that, comprising:
For natural light being converted to the Polarization converter of S polarized light;
S polarized light for being exported by Polarization converter is divided into the color separation Philips type prism of blue light, green glow, ruddiness;
Blue light for being exported by color separation Philips type prism carries out the first image intensifier strengthened;
Ruddiness for being exported by color separation Philips type prism carries out the second image intensifier strengthened;
Green glow for being exported by color separation Philips type prism carries out the 3rd image intensifier strengthened;
Blue light, the ruddiness of the second image intensifier enhancing and the green glow of the 3rd image intensifier enhancing for being strengthened by the first image intensifier carry out closing the conjunction color component of look;
And, the light signal closing color component output is converted into the imaging device of image;
Described color separation Philips type prism comprises the first lens of being coated with anti-blue saturating red green dichroic coating and is coated with counter the second lens being popular in blue-green dichroic coating, and on the second lens in described color separation Philips type prism, the anti-blue-green dichroic coating side that is popular in is connected with green glow exit lens;
Described conjunction color component is for closing look Philips type prism, described conjunction look Philips type prism comprises the first lens of being coated with anti-blue saturating red green dichroic coating and is coated with counter the second lens being popular in blue-green dichroic coating, on the second lens in described conjunction look Philips type prism, the anti-blue-green dichroic coating side that is popular in is connected with green glow entrance lens, wherein, the blue light strengthened through the first image intensifier is penetrated from described conjunction look Philips type prism by the saturating red green dichroic coating reflection of the anti-indigo plant on the first lens, the ruddiness strengthened through the second image intensifier reflects from described conjunction look Philips type prism injection by the anti-blue-green dichroic coating that is popular on the second lens, the anti-saturating red green dichroic coating of anti-indigo plant being popular in blue-green dichroic coating and the first lens that green glow through the 3rd image intensifier enhancing passes the second lens penetrates from described conjunction look Philips type prism.
2. the Color Night Vision System based on Philips type prism according to claim 1, is characterized in that, the first described image intensifier, the second image intensifier and the 3rd image intensifier are gleam image intensifier.
3. the Color Night Vision System based on Philips type prism according to claim 1, is characterized in that, described imaging device is CCD imaging device or COMS imaging device.
4. the Color Night Vision System based on Philips type prism according to claim 1, is characterized in that, in the described Color Night Vision System based on Philips type prism, light path turns to and adopts catoptron, right-angle prism or curved fiber bundle.
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| WO2021056559A1 (en) * | 2019-09-29 | 2021-04-01 | Oppo广东移动通信有限公司 | Beam splitter prism group, camera device, camera method, and terminal |
| CN113865709A (en) * | 2021-08-16 | 2021-12-31 | 杭州博联智能科技股份有限公司 | Intelligent lamp color testing device and method based on prism color separation |
| CN114815217B (en) * | 2022-05-06 | 2024-06-11 | 山东北方光学电子有限公司 | Synchronous imaging control circuit for glimmer and display device of multifunctional helmet glasses and using method |
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|---|---|---|---|---|
| US6570147B2 (en) * | 2001-05-22 | 2003-05-27 | Itt Manufacturing Enterprises, Inc. | Color night vision apparatus |
| CN102932651A (en) * | 2011-08-13 | 2013-02-13 | 上海摩晶电子科技有限公司 | Color night vision device |
| CN203720446U (en) * | 2014-01-27 | 2014-07-16 | 杭州科汀光学技术有限公司 | Colored night vision system based on Philips type prism |
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2014
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