• 천문학회보
• /
• 제39권1호
• /
• pp.53.2-53.2
• /
• 2014

IGRINS, the Immersion GRating INfrared Spectrometer, is a near-infrared wide-band high-resolution spectrograph jointly developed by the Korea Astronomy and Space Science Institute and the University of Texas at Austin. IGRINS employs three HAWAII-2RG focal plane array (FPA) detectors. The mechanical mounts for these detectors serves a critical function in the overall instrument design: Optically, they permit the only positional compensation in the otherwise "build to print" design. Thermally, they permit setting and control of the detector operating temperature independently of the cryostat bench. We present the design and fabrication of the mechanical mount as a single module. The detector mount includes the array housing, a housing for the SIDECAR ASIC, a field flattener lens holder, and a support base. The detector and ASIC housing will be kept at 65 K and the support base at 130 K. G10 supports thermally isolate the detector and ASIC housing from the support base. The field flattening lens holder attaches directly to the FPA array housing and holds the lens with a six-point kinematic mount. Fine adjustment features permit changes in axial position and in yaw and pitch angles. We optimized the structural stability and thermal characteristics of the mount design using computer-aided 3D modeling and finite element analysis. Based on the computer simulation, the designed detector mount meets the optical and thermal requirements very well.

• Journal of the Optical Society of Korea
• /
• 제10권3호
• /
• pp.105-111
• /
• 2006

A novel image quality evaluation method, which is based on combination of the rigorous grating diffraction theory and the ray-optic method, is proposed. It is applied for design optimization and, tolerance analysis of optical imaging systems implementing diffractive optical elements (DOE). The evaluation method can predict the quality and resolution of the image on the image sensor plane through the optical imaging system. Especially, we can simulate the effect of diffraction efficiencies of DOE in the camera lenses module, which is very effective for predicting different color sense and MTF performance. Using this method, we can effectively determine the fabrication tolerances of diffractive and refractive optical elements such as the variations' in profile thickness, and the shoulder of the DOE, as well as conventional parameters such as decenter and tilt in optical-surface alignments. A DOE-based 2M-resolution camera lens module designed by the optimization process based on the proposed image quality evaluation method shows ${\sim}15%$ MTF improvement compared with a design without such an optimization.

• 한국산학기술학회논문지
• /
• 제12권3호
• /
• pp.1319-1326
• /
• 2011

상업용 3-D simulation tool(OPERA)을 이용하여 슬릿형 위글러가 장착된 초소형 자유전자레이저 모듈에 있어서 위글러 구조에 따른 전자빔 특성을 조사하였다. 전자렌즈의 중앙 전극에 일정한 potential을 인가하여 전자빔이 평행빔이 되도록 divergence를 줄여서 위글러에 입사시켰으며 위글러의 구조 의존성에 따른 위글러 내부에서의 전기장과 potential 분포를 계산하여 위글러에서의 전자빔 궤적의 변화를 조사하였다.

• Journal of the Optical Society of Korea
• /
• 제20권1호
• /
• pp.150-155
• /
• 2016

To evaluate the autofocusing performance of recent mobile phone cameras, it is necessary to determine the peak position of the center field MTF (Modulation Transfer Function), -known as the through focus MTF- of the module. However, the MTF peak position found by conventional methods deviates from the ideal position due to the focus scanning resolution of mobile phone cameras. This inaccurate peak position results in false judgements of the optical performance, leading to yield losses or customer complaints. An increase in the focus scanning resolution can address this problem, but the manufacturing UPH (Unit per Hour) level will also unfortunately increase as well, resulting in a loss of manufacturing capabilities. In this paper, several fitting models are studied to find an accurate MTF peak position within a short period of time. With an analysis of a large amount of manufacturing data, it is demonstrated that the fitting methods can reduce false judgements and simultaneously increase the capabilities of the manufacturing system.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2015년도 제46회 하계학술대회
• /
• pp.1080-1081
• /
• 2015

CPV system in the desert areas or areas near the equator, as is suitable for high-temperature region. As compared to silicon solar cells, CPV system have a high proportion of a BOS (balance of system). Solar cells because of its low proportion when designing a module technology is applied in a variety of ways. Applied to the CPV system is classified into two kinds of optical technology. One of those using fresnel lens uses refraction of light energy. The other is a mirror reflection of the structure using sprays. Both of these two ways to condense the sun to collect solar cell is a form of light. And goals by using a small solar cell materials is to produce more energy. This research proposes rational design approach to calculate proper system capacity in consideration of the aforementioned factors in CPV system.

• Design & Manufacturing
• /
• 제17권2호
• /
• pp.15-21
• /
• 2023

In this study, a diamond turning machine and a laser-assisted machining module were utilized for the complex combined cutting of aspheric shapes and fine patterns on the surface of high-hardness brittle material, silicon. The analysis of material's form accuracy and corrective machining was conducted based on key factors such as laser output, rotational speed, feed rate, and cutting depth to achieve form accuracy below 1 ㎛ and surface roughness below 0.1 ㎛. The cutting condition and corrective machining methods were investigated to achieve the desired form accuracy and surface roughness. The rotational speed of the spindle and the linear feed rate of the diamond turning machine were varied in five stages for the cutting condition test. Surface roughness and form accuracy were measured using both a contact surface profilometer and a non-contact surface profilometer. The experimental results revealed a tendency of improved surface roughness with increased rotational speed of the workpiece, and the best surface roughness and form accuracy were observed at a feed rate of 5 mm/min. Furthermore, based on the cutting condition experiments, corrective machining was performed. The experimental results demonstrated an improvement in form accuracy from 0.94 ㎛ to 0.31 ㎛ and a significant reduction in the average value of the surface roughness curve from 0.234 ㎛ to 0.061 ㎛. This research serves as a foundation for future studies focusing on the machinability in relation to laser output parameters.

• 한국광학회지
• /
• 제10권1호
• /
• pp.73-79
• /
• 1999

1$\times$2, 1$\times$4 및 4$\times$4 LD-gate형 반도체 광스위치 모듈을 제작하였다. 스위치 소자와 광섬유와의 광결합을 위해서 테이퍼드 광섬유를 어레어로 제작하여 사용하였으며 30핀 버터플라이형 패키지로 완성하였다. 광 부푼 정렬 및 고정에서는 레이저 용접법 및 햄머링 공정을 이용하여 최초의 광정렬 값에서 평균 82%까지 복원하였다. 완성된 모듈에 대한 평가를 위해 전송 실험을 수행하였는데 1$\times$2 스위치 모듈이 삽입되었을 때 223-1의 단어길이를 갖는2.5Gbps 광신호에 대해서 전송패널티가 약0.5dB~2dB로 나타났으며, 광섬유의 분산특성에 의하여 발생하는 전송 패널티에 대해서는 50km 및 90km 광섬유에 대해서 각각 0.6dB 및 0.7dB의 작은 패널티가 발생하였다. 1$\times$4 및 4$\times$4 스위치 모듈을 이용한 전송특성 평가에서도 모두 -30dB 이하의 수신감도를 갖는 우수한 결과를 보였다.

• 한국정보통신학회논문지
• /
• 제16권11호
• /
• pp.2431-2436
• /
• 2012

본 논문에서는 LED(Light Emitting Diode)조명을 통해 통신을 접목하여 이용이 간편한 가시광통신 시스템을 구현 하고자 한다. LED 가시광 통신을 실현시키고자 송신부에는 1~12개의 LED 발광 소자와 수신부에는 가변 PD(Photo Diode)인 센서를 사용한다. LED가시광통신을 하고자 개발이 이루어진 송 수신부의 초기 거리 값은 0~1.5m 이상으로 하고, 전체 시스템 전송 속도는 수 천 kbps의 가변성을 가지는 가시광 미디어 전송 시스템을 이루었다. LED 모듈의 전체적인 효율 증대를 위해 렌즈 착용시와 미착용시 성능 실험을 하여 효율 측정을 하였으며, 구현된 연구의 성능 분석을 위한 기존 PC 모듈에 LED 및 PD를 구성하여 LED 개수, 전송속도에 따른 최대 송수신의 통신 거리를 실험하고 응용 방법과 가능성에 대해서 확인하고자 한다.

• 한국소음진동공학회논문집
• /
• 제23권6호
• /
• pp.537-545
• /
• 2013

In this paper, the vibration for actuators having lens module, confined to lateral and torsional directions of suspensions, is described by mathematically analyzing its suspension configuration and motion. In order to prove the accuracy of this result, it is compared to a finite element analysis. Also it is shown that modal frequencies can be modified by changing design parameters in mathematical motion expressions.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2009년도 추계학술대회 논문집
• /
• pp.264-264
• /
• 2009

The sensitivity lighting of pendant type used Micro-controller AVR, embodiment method for Munsell chromaticity diagram system and adoption method for light source lens respectively. About a plan design of light fixture, LED circuit designed flow chart of circuits and LED driver of organizations in electron device. For used Solidworks soft ware program, LED light source must take a heat shink part and LED light fixture module for sensitivity lighting of pendant type into considerations