• Publications of The Korean Astronomical Society
• /
• v.22 no.3
• /
• pp.55-61
• /
• 2007

The KASINICS (Korea Astronomy and Space science Institute Near Infrared Camera System) is a ground-based near-infrared (NIR) imaging instrument. KASINICS has offner relay optics to reduce unwanted infrared light. For the offner optics, we adopted an ultra precision machining process which is installed at KBSI (Korea Basics Science research Institute). Since the offner relay optics is made of aluminum 6061 metal material, we did several tests to reach the specification. We found that a 0.497mm radius nose bite and 220m/min machining speed are best tool and condition to make this offner optics with the precision machine. In this paper, we report the technical method of ultra precision machining and results of the KASINICS offner optics.

• The Bulletin of The Korean Astronomical Society
• /
• v.28 no.2
• /
• pp.51-51
• /
• 2003

• Journal of the Korean Society for Precision Engineering
• /
• v.29 no.3
• /
• pp.253-260
• /
• 2012

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) $0.2\;{\mu}m$.

• Bulletin of the Korean Space Science Society
• /
• 2003.10a
• /
• pp.26-26
• /
• 2003

During fabrication process for the large space optical surfaces, the traditional bound abrasive grinding with bronze bond cupped diamond wheel tools leaves the machine marks and the subsurface damage to be removed by subsequent loose abrasive lapping. We explored a new grinding technique for efficient quantitative control of precision CNC grinding for space optics materials such as Zerodur. The facility used is a NANOFORM-600 diamond turning machine with a custom grinding module and a range of resin bond diamond tools. The machining parameters such as grit number, tool rotation speed, work-piece rotation speed, depth of cut and feed rate were altered while grinding the work-piece surfaces of 20-100 mm in diameter. The input grinding variables and the resulting surface quality data were used to build grinding prediction models using empirical and multi-variable regression analysis methods. The effectiveness of the grinding prediction model was then examined by running a series of precision CNC grinding operation with a set of controlled input variables and predicted output surface quality indicators. The experiment details, the results and implications are presented.

• The Bulletin of The Korean Astronomical Society
• /
• v.28 no.1
• /
• pp.43-43
• /
• 2003

• Korean Journal of Optics and Photonics
• /
• v.18 no.6
• /
• pp.410-420
• /
• 2007

We theoretically derive the set of utilizable paraxial zoom locus equations for all complicated zoom lens systems with infinite object distance, such as a camera zoom lens, by using the Gaussian bracket method and the matrix representation of paraxial ray tracing. And we make the zoom locus program according to these equations in Visual Basic. Since we have applied the paraxial ray tracing equations into Gaussian bracket representation, the resultant program systematically simplifies various constraints of the zoom loci of various N group types. Consequently, the solutions of this method can be consistently used in all types of zoom lens in the step of initial design about zoom loci. Finally, in order to verify the usefulness of this method, we show that one example among 4 groups and that among 5 groups, which are very complex zoom lens systems, can be rapidly and with versatility traced through various interpolations by using this program.

• Journal of Korean Ophthalmic Optics Society
• /
• v.7 no.2
• /
• pp.73-77
• /
• 2002

Applying the computer interface cards installed to old-fashioned, used PENTIUM I for the basic optical experiment makes students to have more attention and interests in the experiment, and enhanced the accuracy of the optical experiment. When applied for the light diffraction experiment, the above way of results made the experiment more accurate comparing with those of other experiments operated in advance. In addition, they turned out to be as same as the data in theory. Applying the above way not only for the basic optical experiments to recycle old-fashioned PCs being abandoned but also for the automation of optical experiments in manual could enhance the efficiency of the experiment a lot.

• Proceedings of the Korean Magnestics Society Conference
• /
• 2008.12a
• /
• pp.304.1-304.1
• /
• 2008

• Bulletin of the Korean Chemical Society
• /
• v.33 no.2
• /
• pp.695-698
• /
• 2012

• Bulletin of the Korean Chemical Society
• /
• v.33 no.4
• /
• pp.1321-1324
• /
• 2012