• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2003년도 춘계학술대회 논문집
• /
• pp.1191-1194
• /
• 2003

At present, the fabrication of optical filter for optical communication mostly depends on handwork, and only a few companies are propelling semi-automatic systems compounded with automatic and hand-operated methods. The measurement evaluation of optical filters is not commonly useful, so it causes difficulties in the producing field. And the packaging process becomes a very unstable process because the filters are judged from the results that they are not measured and immediately packaged during that process. In this situation, the automatic assembly system of optical filter for communication is extremely important and has begun to make its appearance as the most necessary technology for developing optical communication component with high-functionality. In this paper, we constructed systems of assembly and performance evaluation for micro optical collimator. And by using that, we designed a system capable of performance evaluation and assembly of film filter of about 30 $\mu\textrm{m}$ thickness as well as optical filter for common communication.

• Current Optics and Photonics
• /
• 제7권6호
• /
• pp.745-754
• /
• 2023

In order to test the recognition ability and accuracy of a target imaging simulator under the irradiation of solar stray light in a laboratory environment, it needs to be fixed on a five-axis turntable during a hardware-in-the-loop simulation test, so the optical system of the simulator should have a long exit pupil distance. This article adopts a secondary imaging method to design a projection optical system suitable for thin-film-transistor liquid crystal displays. The exit pupil distance of the entire optical system is 1,000 mm, and the final optimization results in the 400 nm-850 nm band show that the modulation transfer function (MTF) of the optical system is greater than 0.8 at the cutoff frequency of 72 lp/mm, and the distortion of each field of view of the system is less than 0.04%. Combined with the design results of the optical system, TracePro software was used to model the optical system, and the simulation of the target imaging simulator at the magnitude of -1 to +6 Mv was analyzed and verified. The magnitude error is less than 0.2 Mv, and the irradiance uniformity of the exit pupil surface is greater than 90%, which meets the requirements of the target imaging simulator.

• 한국광학회지
• /
• 제15권2호
• /
• pp.158-170
• /
• 2004

유선 통신의 포화지역이나 도심에서 벗어난 인구밀도가 낮은 지역 둥에서 고속 광통신을 위해 최근 무선 광통신이 새롭게 기대되고 있다. 본 논문에서는 이러한 무선 광통신을 위한 송신 광학계를 설계하였는데, 광원으로는 수평(7$^{\circ}$)및 수직(18$^{\circ}$) 발산각이 다른 비대칭 타원형 빔을 발산하는 레이저 다이오드(중심 파장 830 nm)를 사용하였다. 제안되는 송신 광학계는 장거리 전송(500 m∼1500 m)이 가능하고, 장거리 전송 후 수신단에서 빔 직경(3 m) 및 에너지 분포가 대칭형이 되도록 설계되었다. 이를 위해 비결상 광학계인 송신 광학계의 평가법으로 에너지 전달 효율과 복사 조도 분포를 계산하였다.

• 한국광학회지
• /
• 제23권4호
• /
• pp.143-146
• /
• 2012

본 논문에서는 반도체 광 증폭기(Semiconductor Optical Amplifier)의 교차 진폭 변조 현상을 이용하여 광 컴퓨팅이나 광통신에서 데이터의 패킷 교환, 데이터 리셋 혹은 추가나 제거에 필수적인 전광 데이터 추출을 시뮬레이션하고 실험적으로 구현하였다. 전광 데이터 추출의 실험적 시뮬레이션에는 상용 프로그램인 VPI Tool을 사용하였으며 기본적으로 두 개의 반도체 광 증폭기(SOA)를 사용하여 AND 논리를 구성한 후 이를 이용하여 데이터를 추출하였다. 또한 높은 집적성과 효율로 고속으로 연산할 수 있는 가능성을 확인하였다.

• Journal of the Optical Society of Korea
• /
• 제20권1호
• /
• pp.64-69
• /
• 2016

A new compact conformal dome optical system was established, and the aberration characteristics of the dome were investigated using Zernike aberration theory. The aberrations induced by the dome at different fields of regard (FORs) from 30° to 100° were effectively balanced by a rotating cylindrical lens. This kind of optical system can be widely used in top-view optical searching devices. A design method was introduced and the optimization results analyzed in detail. The results showed that the Zernike aberrations produced by the conformal dome were decreased dramatically. Also, a complete conformal optical system was designed, to further illustrate the aberration correction effect of the rotating cylindrical lens. Using a cylindrical lens not only provided a large FOR, but also simplified enormously the structure of the conformal optical system.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 1998년도 춘계학술대회 논문집
• /
• pp.82-87
• /
• 1998

Laser printer, faximile and copy machine are a few examples of OA(office automation) system. In such a system, the reflecting mirror has been employed for transmitting a target image to optical device. Therefore, to develope a good quality of optical system, the quality control of optical mirror was required. In recent years, considerable efforts have been directed toward the development of automated optical glass inspection system because the inspection is eye-fatigue and monotonous job for humans to perform. In this paper, we propose a inspection system applying algorithm of image processing for detecting defects of optical glass such as pinhole, scratch. From the experiments, the proposed inspection system shows reliable results.

• Current Optics and Photonics
• /
• 제8권1호
• /
• pp.97-104
• /
• 2024

In aerial cameras, image quality is easily affected by weather, temperature, and the attitude of the aircraft. Aiming at this phenomenon, based on the theory of two-step zoom optical systems, a dual-band optical-despun two-step zoom optical system is designed. The system has a small field of view of 2.00° × 1.60°, and a large field of view of 4.00° × 3.20°. In the zoom process, the wavelength range is 0.45-0.70 ㎛ and 0.75-1.10 ㎛, and the size of the optical system is 168 mm (L) × 90 mm (W) × 60 mm (H). The overall lens weight is only 170.8 g, which has advantages for miniaturization and light weight. At the Nyquist frequency of 104 lp/mm, the modulation transfer function of the visible-light optical system is more than 0.44, and that of the near-infrared optical system is more than 0.30, both of which have good imaging quality and tolerance characteristics in the range of -45 to 60 ℃.

• 한국광학회지
• /
• 제32권4호
• /
• pp.153-162
• /
• 2021

본 논문에서는 적외선 탐색 및 추적 기능을 수행하는 광각 주사 광학계와 표적의 전자광학 추적 기능을 수행하는 협/중시계 광학계의 기능이 통합된 가변 F/수 삼중 배율 적외선 광학계를 설계하였다. 기존 광각 주사 광학계를 기반으로 무한 초점 광학계를 전단부에 설계하여 협/중시계 기능을 수행할 수 있는 광학계를 구현하였다. 시스템 성능 분석을 통해 성능 목표를 설정하고, 이를 바탕으로 광학계 설계를 위한 설계 사양을 도출하였으며, F/수가 다른 광학계를 추가하기 위해 조리개 크기를 줄여주는 웜 스톱을 적용하였고, 설계된 광학계에 적합하도록 세부 형상을 설계하였다. 설계 완료된 협/중시계 광학계 설계 결과를 분석하여 MTF (modulation transfer function)와 같은 목표 성능을 만족하는 것을 확인하였으며 운용성을 고려하여 비열화와 표적 거리에 따른 초점 렌즈군의 이동량을 분석하였고, 이를 통해 광역 탐색 및 추적 기능과 정밀 추적 및 3차원 정보 획득 기능이 통합된 단일 광학 시스템의 구현이 가능함을 확인하였다.

• Current Optics and Photonics
• /
• 제1권4호
• /
• pp.284-288
• /
• 2017

In order to investigate the ultraviolet-excited photoluminescence properties of phosphor coatings and their relationship to thickness, Lumogen coatings with different thicknesses were deposited on quartz substrates and charge-coupled device chips by thermal evaporation. The variation of the film thickness affected the crystallite size, surface roughness and fluorescence signal. It was found that the Lumogen coating with the thickness of 420 nm has the largest luminescent signal and conversion efficiency, and the corresponding coated charge-coupled devices had the maximum quantum efficiency in the ultraviolet. These results provided one key parameter for improving the sensitivity of Lumogen coated charge-coupled devices to ultraviolet light.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2002년도 추계학술대회 논문집
• /
• pp.536-539
• /
• 2002

In this paper, we developed the automatic optical fiber aligner by image processing and automatic loading system. Optical fiber is indispensable for optical communication systems that transmit large volumes of data at high speed, but super-precision technology in sub-micron units is required for optical axis adjustment, we have developed 6-axis micro stage system for I/O optical fiber arrays, the initial automatic aligning system/software for a input optical array by the image processing technique, fast I/O-synchronous aligning strategy, the automatic loading/unloading system and the automatic UV bonding mechanism. In order to adjust the alignment it used on PC based motion controller, a $10\mu\textrm{mm}$ repeat-detailed drawing of automatic loading system is developed by a primary line up for high detailed drawing. Also, at this researches used the image processing system and algorithm instead of the existing a primary hand-line up. and fiber input array and waveguide chip formed in line by automatic. Therefore, the developed and manufactured optical aligning system in this research fulfills the great role of support industry for major electronics manufacturers, telecommunications companies, universities, government agencies and other research institutions.