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Ultra Precision Machining of the Winston Cone Baffle for Space Observation Camera
Yang, Sun Choel,Kim, Geon Hee,Huh, Myung Sang,Lee, Sang Yong,Kim, Sang Hyuk,Lee, Gil Jae Trans Tech Publications, Ltd. 2012 Key Engineering Materials Vol.516 No.-
<P>The Winston cone baffle was developed for the space observation camera of the MIRIS (Multi-purpose Infrared Imaging System) which is the main payload of STSAT-3 (Science and Technology Satellite). The Winston cone baffle reduces the orbital heat load to the STSAT-3 and is thermally connected to the radiator to cool down. The jig and ultra precision machining jig was designed using a 3D modelling program and analyzed using a computer aided engineering program (ANSYS). The reasons for designing the jig for the baffle were to enhance the stability of the machining and improve the form accuracy of the baffle. The strength, weight and barycentre of the jig are investigated to find the optimized ultra precision machining conditions. To maintain the weight balance of the baffle at high speed rotation, there are lots of holes that can be inserted by heavier bolts. Vibration of the natural diamond bite tool is reduced by using thin copper pipe and urethane silicone. Using this bite tool, we could decrease patterns on the surface of the Winston cone baffle. The results of the simulation using ANSYS show that maximum deformation of the baffle is less than the tolerance limit. Surface roughness of the fabricated Winston cone baffle is machined with the jig and the machining tool is under 5 nm. The Winston cone baffle is plated with gold after being electroless plated with nickel. This baffle is applied to the flight model of the MIRIS.</P>
양순철(Sun-Choel Yang),김상혁(Sang-Hyuk Kim),허명상(Myung-Sang Huh),장기수(Ki-Soo Chang),박순섭(Soon-Sub Park),원종호(Jong-Ho Won),김건희(Geon-Hee Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
Ultra Precision Machining Techniques, such as manufacturing Micro Lens Array(MLA), off-axis mirror, F-θ lens for laser printer, are achieved, based on technologies in consequence of development of modern high-precision machining mechanism. Above all, FTS(Fast Tool Servo) and STS(Slow Tool Servo) are more innovative technologies for reducing time and development costs. In this paper, it is described that MLA machining technique by FTS, off-axis mirror machining technique by STS, optics for observing space, and development of infrared aspheric lens for a thermal imaging microscope.
양순철(Sun Choel Yang),원종호(Jong Ho Won) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.12
Recently, there is a demand for a thermal imaging microscope in the medical field as well as the semi-conductor industry. Although the demand of the advanced thermal imaging microscope has been increased, it is very difficult to obtain the technology of developing a thermal camera, because it is used for defense industry. We developed the x5 zoom microscope which has 3 ㎛ spatial resolution to research the design and fabrication of the IR (Infrared) optical system. The optical system of the IR microscope consists of four spherical lenses and four aspheric lenses. We verified individual sensitivity of each optical parameter as the first order approach to the analysis. And we also performed structure and vibration analysis. The optical elements are fabricated using Freeform 700A. The measurement results of surface roughness and form accuracy using NT 2000 and UA3P are Ra 2.36 ㎚ and P-V 0.13㎛. Finally we ascertained resolution power of 3 ㎛ using USAF (United State Air Force) 1951 IR resolution test chart.
양순철(Sun Choel Yang),원종호(Jong Ho Won) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.12
Using an IR (infrared) optical system of observation and research were performed long before. Nowadays satellites equipped with IR optical system observe the earth and universe. In this paper, we developed the IR optical system for main payload of the STSAT-3 (Science and Technology Satellite -3). We studied the ultra precision machining technique to fabricate FPL-53 lenses which is the IR optical material for space observation camera of the STSAT-3. DOE (Design of Experiment) was used to find best machining characteristic for FPL-53. Finally we fabricated FPL-53 aspheric lens with the form accuracy of P-V 0.36 ㎛.
양순철(Sun Choel Yang),허명상(Myung Sang Huh),김상혁(Sang Hyuk Kim),이길재(Gil Jae Lee),이상용(Sang Yong Lee),국명호(Myung Ho Kook),장기수(Ki Soo Chang),유선영(Seon Young Ryu),원종호(Jong Ho Won),김건희(Geon Hee Kim) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.3
In nowadays, the infrared optics is frequently employed to various fields such as military, aerospace, industry and medical. To develop the infrared optics, special glasses which can transmit infrared wave are required. Ge(Germanium), Si(silicon), and fluoride glasses are typically used for material of the infrared optics. Compared with Ge and Si glasses, fluoride glasses have high transmittance in infrared wavelength range. Additionally, UV(ultraviolet) and visible light can be transmitted through fluoride glasses. There characteristics of fluoride glasses makes it possible to evaluate optical performance with generally used visible testing equipment. In this paper, we used design of experiment to find ultra precision machining characteristic of Ge and fluoride glasses and optimized machining process to obtain required form accuracy of PV(Peak to Valley) 0.2 ㎛.
양순철(Sun Choel Yang),김건희(Gun Hee Kim),김효식(Hyo Sik Kim),신현수(Hyun Soo Shin),원종호(Jong Ho Won) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.5
This paper describs about the technique of ultra-precision machining for an infrared(IR) camera aspheric mirror. A 200 ㎜ diameter aspheric mirror was fabricated by SPDTM(Single Point Diamond Turning Machine). Aluminum alloy as mirror substrates is known to be easily machined, but not polishable due to its ductility. Aspheric large reflector without a polishing process, the surface roughness of 5 ㎚ Ra, and the form error of λ/2 (λ=632.8 ㎚) for reference curved surface 200 ㎜ has been required. The purpose of this research is to find the optimum machining conditions for cutting reflector using A16061-T651 and apply the SPDTM technique to the manufacturing of ultra precision optical components of Al-alloy aspheric reflector. The cutting force and the surface roughness are measured according to each cutting conditions feed rate, depth of cut and cutting speed, using diamond turning machine to perform cutting processing. As a result, the surface roughness is good when feed rate is 1㎜/min, depth of cut 4 ㎛ and cutting speed is 220 m/min. We could machined the primary mirror for IR camera in diamond machine with a surface roughness within 0.483 ㎛ Rt on aspheric.