• Title/Summary/Keyword: optical performance evaluation

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Optimization of 30 cm Lightweight Mirror (30 cm 급 반사경 경량화 최적 설계)

  • Kim, Bong-Ho;Lee, Jong-Ung;Moon, Il-Kwon;Yang, Ho-Soon;Kihm, Hag-Yong;Lee, Yun-Woo
    • Korean Journal of Optics and Photonics
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    • v.21 no.5
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    • pp.214-223
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    • 2010
  • Optimization of a 30 cm lightweight mirror was proposed with the best optical performance under various loads of gravity and thermal loads with proper boundary conditions. A pattern for a lightweight mirror was generated based on the best optical performance combined with ease of manufacturing for proper design parameters of physical properties of face sheet, back sheet, rib, and web. Evaluation of the optical performances of a telescope mirror was obtained by using the finite element analysis program, NX I-DEAS. Surface errors, individual aberration terms, such as piston, tilts, focus and other aberrations were calculated by using Zernike polynomials. The proposed telescope mirror meets well the opto-mechanical design consideration of RMS surface error less than 16 nm.

Performance Evaluation of An Earth Observation Camera for Small Satellites (소형 위성용 지구관측 광학카메라의 시험모델 평가)

  • 양호순;강명석;정성근;최영완;김이을;양승욱;김종운;윤지호;김도형
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.07a
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    • pp.134-135
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    • 2003
  • Medium-sized Aperture Camera (MAC)는 근적도궤도(Near Equatorial Orbit) 지구관측위성 MACSAT의 주탑재체로, 우리나라의 (주)쎄트렉아이와 말레이시아의 ATSB社와 오는 2004년 발사를 목표로 공동 개발되고 있다. MAC은 push-broom 방식의 전자광학 탑재체로, 지상해상도 2.5 m를 가지는 PAN band 1개, 지상해상도 5 m를 가지는 Multi-Spectral band 4 개를 가지고, 지상의 swath width는 20 km를 가진다. (중략)

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Depth Resolution Analysis of Axially Distributed Stereo Camera Systems under Fixed Constrained Resources

  • Cho, Myungjin;Shin, Donghak
    • Journal of the Optical Society of Korea
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    • v.17 no.6
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    • pp.500-505
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    • 2013
  • In this paper, we propose a novel framework to evaluate the depth resolution of axially distributed stereo sensing (ADSS) under fixed resource constraints. The proposed framework can evaluate the performance of ADSS systems based on various sensing parameters such as the number of cameras, the number of total pixels, pixel size and so on. The Monte Carlo simulations for the proposed framework are performed and the evaluation results are presented.

Process Study of Direct Laser Lithographic System for Fabricating Diffractive Optical Elements with Various Patterns (다중 패턴의 회절광학소자 제작을 위한 레이저 직접 노광시스템의 공정 연구)

  • Kim, Young-Gwang;Rhee, Hyug-Gyo;Ghim, Young-Sik;Lee, Yun-Woo
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.2
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    • pp.58-62
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    • 2019
  • Diffractive Optical Elements(DOEs) diffracts incident light using the diffraction phenomenon of light to generate a desired diffraction image. In recent years, the use of diffraction optics, which can replace existing refractive optical elements with flat plates, has been increased by implementing various optical functions that could not be implemented in refractive optical devices and by becoming miniaturized and compacted optical elements. Direct laser lithography is typically used to effectively fabrication such a diffractive optical element in a large area with a low process cost. In this study, the process conditions for fabricating patterns of diffractive optical elements in various shapes were found using direct laser lithographic system, and optical performance evaluation was performed through fabrication.

Development of an Earth Observation Optical Payload Simulator

  • Lee, Jong-Hoon;Lee, Jun-Ho;Cheon, Yee-Jin
    • Bulletin of the Korean Space Science Society
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    • 2008.10a
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    • pp.35.1-35.1
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    • 2008
  • The importance on the simulation of earth observation optical payloads has been recently emphasized in order to estimate on-orbit imaging performance of the payloads. The estimation should consider all aspects of payload development; design, manufacture, test, assembly, launch and space environment. Until recently several studies have been focused the evaluation of the individual factors rather than the integrated. This paper presents the development of an integrated payload simulator. The simulator analyzes the payload imaging performance based on MTF(Modulation Transfer Function) calculations of the major factors (Diffraction, Aberration, Detector integration, Image motion and etc.) and the simulator can generate realistic artificial earth images as taken by defined earth observation payloads. The simulator is developed for the use of evaluating pre- and post-launch imaging performance and assisting on-board calibration of COMPSAT-3.

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High Optical Performance of 7" Mini-monitor Based on 2D-3D Convertible Autostereoscopic Display

  • Kim, Sun-Kyung;Park, Sang-Hyun;Kim, You-Jin;Min, Kwan-Sik;Park, Seo-Kyu;Jhun, Chul-Gyu;Kwon, Soon-Bum
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1367-1370
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    • 2009
  • We have developed a 2D-3D convertible 7" autostereoscopic mini-monitor with high 3D quality, in which the parallax barrier LCD is attached on the TFTLCD. The excellent optical performance was achieved by design of the ghost free barrier and precise assembly between the barrier layer and the TFT-LCD panel. Our design principle and fabrication technology suppressed 3D cross-talk and improved viewing angle. In this paper, the design and fabrication process of the 3D mini-monitor are described. The evaluation for the 3D performance is also discussed.

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Performance Evaluation of A Tunable Dispersion Compensator based on Strain-Chirped Fiber Bragg Grating in a 40 Gb/s Transmission Link

  • Kim, Chul-Han;Bae, Jun-Key;Lee, Kwan-Il;Lee, Sang-Bae
    • Journal of the Optical Society of Korea
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    • v.12 no.4
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    • pp.244-248
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    • 2008
  • We have evaluated the performance of strain-chirped fiber Bragg grating (FBG) based tunable dispersion compensator in a 40 Gb/s transmission link. In our proposed compensator, the value of dispersion could be changed from -353 ps/nm to -962 ps/nm by adjusting the rotation angle of the metal beam on which the FBG was mounted. In order to evaluate the effect of ripples in reflectivity and variations in passband of the FBG based dispersion compensator, transmission performance has been measured with our tunable dispersion compensator. Error-free transmission of a 40 Gb/s non-return-to-zero (NRZ) signal over conventional single-mode fiber (SMF) was achieved.

Performance Evaluation of Pipelined Dynamic Bandwidth Algorithm for XG-PON (XG-PON의 Pipeline 방식의 동적대역할당 성능평가)

  • Gong, Byung Gu;Han, Man Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2014.10a
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    • pp.148-149
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    • 2014
  • This paper evaluates performance of a pipelined dynamic bandwidth allocation scheme for XG-PON (10-Gbps-capable passive optical network) system for power saving. Under self-similar traffic and balanced input loads, we evaluate performance of XG-PON systems using computer simulations.

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Design and Performance Evaluation on 2×2 Balanced-Bridge Mach-Zehnder Interferometric Integrated-Optical Biochemical Sensors using SOI Slot Optical Waveguides (SOI 슬롯 광 도파로를 활용한 2×2 Balanced-Bridge Mach-Zehnder 간섭형 집적광학 바이오케미컬 센서 설계 및 성능평가)

  • Hongsik Jung
    • Journal of Sensor Science and Technology
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    • v.32 no.4
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    • pp.223-231
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    • 2023
  • An integrated-optical biochemical sensor structure that can perform homogeneous and surface sensing using a 2×2 balanced-bridge Mach-Zehnder interference structure based on the optimized SOI slot optical waveguide was described, and its performance and characteristics were evaluated. Equations for the two output optical powers were derived and examined using the transfer matrices of a 3-dB coupler and phase shifter (channel waveguide). The length of the 3-dB coupler was determined such that the two output optical powers were same using these formulas. In homogeneous sensing, the effect of the refractive index of an analyte in the range of 1.33-1.36 on the two output optical power distributions was numerically derived, and the sensitivity was calculated based on each output and the difference between the two outputs, the former and the latter being 7.5796-19.0305 [au/RIU] and 15.2601-38.1351 [au/RIU], respectively. In the case of surface sensing, the sensitivity range of the refractive index of 1.337 based on each of the two outputs was calculated as -2.2490--3.5854 [au/RIU] and 1.2194-3.8012 [au/RIU], and the sensitivity range of 4.8048-7.0694 [au/RIU] was confirmed based on the difference between the two outputs.

Optimal Design of Optical Filter Recognizing Financial Account with Multiple Attribute Using Analytic Hierarchy Process (계층적 분석 과정을 이용한 다중 속성의 금융통장 인식용 광학 필터의 최적 설계)

  • Yu, Hyeung Keun;Lee, Kang Won
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.6
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    • pp.407-416
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    • 2014
  • Five factors are identified, which affect the performance of optical filter: 1) type of optical glass, 2) existence of Fe, 3) photo pic coating type, 4) coating form, and 5) coating thickness. If we consider all the levels of five factors, there are 360 possible candidates. We determined five evaluation criteria, which can be used to evaluate possible candidates. For the performance measures we selected white-state avearge voltage, black-state average voltage, and black-state error rate. And we added economic criterion and quality and maintenance criterion. Through the two-step statistical analysis of white-state avearge voltage, black-state average voltage, and black-state error rates, we selected final four candidates. Based on the five criteria we finally determined optimal optical filter using AHP.