• Journal of the Korean Society of Radiology
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• v.5 no.6
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• pp.409-413
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• 2011

An X-ray tube used an X-ray fluorescence analysis system has a low X-ray photon intensity which results in reducing measurement accuracy and increasing exposure time. These shortages can be overcame by using a monocapillary optics. A monocapillary optics was optimally designed for focusing the characteristic X-ray of tungsten (8.4 keV). The monocapillary optics can achieve a gain of 10 at the least. The monocapillary optics was fabricated by using puller and pyrex glass, raw material. In fabrication, a weigh of 45g and a temperature of $650^{\circ}$ was loaded. The total fabrication time was 460 minutes. The fabricated capillary had 87 mm in length and maximum diameter of 300 ${\mu}m$ and minimum diameter of 192 ${\mu}m$. When the fabricated monocapillary optics is applied to an X-ray fluorescence analysis system, the detection accuracy for soft elements, for example sulfur (S), will be improved.

• Korean Journal of Optics and Photonics
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• v.19 no.4
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• pp.287-293
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• 2008

The collimator which makes a collimated beam, is an essential instrument for assembly and evaluation of telescopes. Recently, the Cassegrain type collimator has been widely used for its compact size as the focal length of high resolution cameras becomes longer. However, this kind of collimator has a disadvantage in that the secondary mirror is a heat source which can degrade the evaluation accuracy for an IR camera system. In this paper, we present the fabrication and measurement process for an off-axis parabolic mirror with the physical diameter pf 1 m, effective diameter 930 mm, and the focal length 6 m. After four months of works we obtained the final surface wave-front error of 30.4 nm rms ($\lambda$/138, ${\lambda}=4.2\;{\mu}m$), which is capable of evaluation of an IR camera as well as a visible camera.

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.2
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• pp.123-128
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• 2002

This study is to develop optical lining device for vacuum binding of PDP and FED. It is very difficult precise technology to line a front board and back board accurately and fast every time when two boards are joined together. Especially, these technology is difficult to be transferred from developed countries. In this study, the accuracy of lining of two boards in vacuum device by developing an optical lining device for vacuum binding as an image processor and CCD camera configured to be high magnification lens with long focus using optical design.

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.1
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• pp.63-67
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• 2002

In this paper we analyzed the optical property after we chose the lens system to cover a wide angular field which is designed to use a established designed meniscus negative outer element. The special quality of the system is to offer a wide angular field by getting only one outer negative element and to be a compacted optical system to utilize the good point of miniaturization and light-weighturization by using two aspheric surfaces. Also, we observed the aberration correction of a aspheric as we investigated two aspheric's forms to use for a aberration correction.

• Korean Journal of Optics and Photonics
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• v.22 no.5
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• pp.239-244
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• 2011

We introduce Gaussian (or paraxial) optics that can be successfully applied to design, for use in a color analyzer, a non-imaging optical system on a measurement probe for LCD display. The color analyzer is used to decompose colored lights leaving from some measurement area on the LCD display to red, green, and blue. The color analyzer must include a condenser lens whose purpose is to gather colored lights to illuminate a small area on the sensor. In order to satisfy a reduction ratio between the measurement area and the sensing area with a non-imaging condition, a condenser lens is analytically treated by means of Gaussian optics so that good understanding of the non-imaging condenser lens is achieved as a good design is derived. As a result, the technique shows the necessity of analytical treatment in contrast to the design approach using only commercial software such as CODE-V, Light-Tools, and others. Of course, CODE V and Light-Tools are also utilized in this paper to confirm and complete the Gaussian optical design.

• Korean Journal of Optics and Photonics
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• v.28 no.1
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• pp.1-8
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• 2017

A method for inspecting defects in display substrates utilizing Fourier optics is proposed in this paper. A cost-effective inspection system can be realized with the proposed method, because it does not require a high-magnification microscope. Also, the proposed method can avoid tight tolerance for variations in displacement between substrate and camera, which is stems from shallow depth of field of the high-magnification microscope. In addition, possible damage caused by collisions between substrate and the inspection equipment can be avoided. The decision algorithm can be simpler than for a conventional inspection system, because spatial shift of periodic substrate patterns does not affect the intensity distribution of the diffracted light, by the Fourier transform property. The proposed method is explained with numerical studies, and experiments are carried out to check its feasibility for color-filter substrates of a liquid-crystal display.

• Korean Journal of Optics and Photonics
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• v.32 no.1
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• pp.9-14
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• 2021

In this paper we have studied an optical system according to the aperture position of an off-axis TMA telescope for satellites. An off-axis TMA telescope should have high resolution and wide field of view (FOV). In addition, the optical system should have a wide tolerance range, because it is structurally located off-axis and is difficult to assemble. However, there are differences in performance and sensitivity according to the aperture-stop position, so it is important to select a suitable aperture-stop position. Therefore, in this paper we have designed each off-axis TMA telescope according to the aperture-stop position, and have analyzed the performance and sensitivity to suggest a suitable aperture-stop position.

• The Optical Journal
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• s.133
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• pp.24-26
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• 2011

Optics & Photonics 전시관 앞바다에 거대한 풍차가 힘차게 돌아가면서 풍력발전을 하고 있는데 이는 대참사를 극복하고 부흥하는 일본의 미래를 예견하고 있는 듯 했다. 대지진, 쓰나미, 원전사고라는 3대 재해가 큰 충격을 주고 있는 와중에 지난 4월 20일부터 22일까지 파시피코 요코하마에서 열린 이번 전시회는 대일 수출상담, 최신 광학기술 정보수집과 급변하는 일본 현지상황을 파악할 수 있는 좋은 기회가 되었다. 피해지역 주민들이 침착함을 잃지 않고 질서정연한 모습을 보여주면서 "남에게 절대로 폐를 끼치지 않는다는 메이와 쿠(미혹(迷惑)) 정신"이 세계 언론의 스포트라이트를 받았다. 원전사고가 초래한 심각한 전력난은 일본의 전력계획을 대대적으로 개혁시켜서 향후 일본 산업이 새롭고, 더욱 강력하게 일어설 것으로 예상된다.

• Korean Journal of Optics and Photonics
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• v.4 no.1
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• pp.120-131
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• 1993

The wave-particle duality of light is studied in connection with the development of thoghts in physics. The various ideas from Einstein to quantum optics are traced and the experimental evidences for each idea are enumerated. Moreover, the delicate features in quantum mechanics are pointed out and the conceptual bases of those features are stated.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.1
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• pp.78-85
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• 2018

As a numerical analysis technique to predict the radar cross section of an aircraft, a full wave method or an asymptotic method is mainly used. The full-wave method is expected to be relatively accurate compared with the asymptotic method. The asymptotic method is numerically efficient, and it is more widely used in the RCS analysis. However, the error that occurs when estimating the RCS using the asymptotic method is difficult to predict easily. In this paper, we analyze the allowable limits of physical optics by constructing a wedge-cylinder model and comparing the RCS prediction results between the method of moment and physical optics while changing the edge shape. Finally, this study proposes a criterion for allowable limit of physical optics in the RCS estimation.