• Title/Summary/Keyword: 광학(optics)

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The Developement of Secondary Optics Design Method for LED (LED 2차 광학 시스템의 설계법 개발)

  • Jung, Seung-Gyun;Seok, Dae-Il;Shin, Hwa-Young;Lee, Chang-Mo;Kim, Hoon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.6
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    • pp.26-32
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    • 2007
  • Design methods of LED optic system includes point source assumption and imaginary focus approaches. However, these methods make significant error if the position of LED approachs that of optic system. This paper suggests a new design approach that LED is equally divided, light distribution of each division is predicted and confirmed through reverse tracing of light wave, and then each divided segment is separately designed, Using new design method, two kinds of example optic system were designed and light distribution and efficiency of the systems were evaluated.

Fundamentals of Liquid Crystal and Liquid Crystal Optics (액정의 비등방 물성 및 광학 특성)

  • Yu, Chang-Jae;Lee, Sin-Doo
    • Korean Journal of Optics and Photonics
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    • v.24 no.4
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    • pp.159-167
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    • 2013
  • The liquid crystal(LC) display is the most promising technology of the flat panel displays covering all applications from small mobile to large television applications. To understand the operating principles and improve the performances of the various LC displays, one should grasp the anisotropic nature of the LC and the propagation of light in the anisotropic media. Basic formulas governing the distribution of the LC molecules, directly related to the electro-optic effects of the LC devices, are described in view of the macroscopic interaction. Based on the matrix representation, the polarization analysis for the LC devices is also presented.

Fabrication and Characterization of N×N Plastic Optical Fiber Star Coupler based on Fused Combining

  • Kim, Kwang Taek;Lee, Byeong Ha;Lee, Cherl-Hee;Lee, Jonghun
    • Korean Journal of Optics and Photonics
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    • v.24 no.1
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    • pp.17-22
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    • 2013
  • High performance plastic optical fiber (POF) $N{\times}N$ star couplers are implemented based on fusing and combining technology. A set of cladding-removed POFs are fused into a solid body by heating and pressing them together to form the transition region between the input and output sides. The operation principle of the proposed star coupler is explained based on ray optics. To demonstrate the performance of the device, $2{\times}2$, $4{\times}4$ and $6{\times}6$ type POF couplers were fabricated and characterized. Performances of the POF star couplers were evaluated in terms of the flatness of the coupling ratios and excess losses.

The design study of optics and opto-mechanics for Lyman-a sun camera of scientific satellite

  • Kim, Kil-Seon;Lee, J.G.;Lee, Y.H.;Rim, Cheon-Seog;Jang, Min-Hwan;Oh, Oh;Park, Jung-Sun;Lee, Woo-Yun;Kim, Geon-Hee
    • Proceedings of the Optical Society of Korea Conference
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    • 2004.07a
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    • pp.64-67
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    • 2004
  • The optics and opto-mechanics are disigned for imaging the sun at Lyman-${\alpha}$ line for scientific satellite. The optics are composed of conic mirrors. In order to block stary light. the new baffle design method is suggested. And we will present the opto-mechanics for this scientific satellite.

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Fresnel lens optics simulation with middle sized linear concentration without secondary optics (2차 광학계가 필요없는 프레넬 렌즈를 이용한 중집광 광학계 시뮬레이션)

  • Kang, Sung-Won;Kim, Yong-Sik;Sim, Chang-Ho
    • 한국태양에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.27-33
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    • 2011
  • HCPV(High Concentrated PV) systems have well known for CPV market all over the world. Low concentration type silicon based modules have been introduced in the market. But low cost of standard flat silicon modules made them useless nowadays. High cost of compound semiconductor solar cell reduced cost effective cpv module production than that of recently silicon solar cell. In order to overcome increasing cost of CPV module, we study middle concentration type fresnel lens simulation using concentrated type silicon based solar cell. Linear type fresnel lens made production of CPV module without secondary optics such as light pipe or light tunnel. This type of fresnel lens design makes more cost effective solution for cpv niche market.

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THE DESIGN OF QUASI-OPTICS FOR DUAL-CHANNEL SIS RECEIVER (100GHz/150GHz 대역용 이중채널 SIS수신기의 준광학계 설계)

  • 박종애;한석태;김광동;김효령;정현수;김태성;이창훈;조세형;양종만
    • Journal of Astronomy and Space Sciences
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    • v.14 no.1
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    • pp.67-79
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    • 1997
  • We have designed the quasi optics of the dual channel receiver to observe the radio sources with 100GHz-band and 150GHz-band simultaneously. We introduced the general quasi optics and the relation between the Gaussian beam and thin lens approximation. We determined the parameters of the quasi optic components to match the beam waist at cassegrain focus with that of feed horn well.

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Interference Fringe Signal Filtering Method for Performance Enhancing of White Light Interfrometry (가간섭 영역 외의 배경 잡음성 간섭무늬 신호 필터링을 통한 백색광 주사간섭계의 성능 향상)

  • Yim, Hae-Dong;Lee, Min-Woo;Lee, Seung-Gol;Park, Se-Geun;Lee, El-Hang;O, Beom-Hoan
    • Korean Journal of Optics and Photonics
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    • v.20 no.5
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    • pp.272-275
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    • 2009
  • In order to enhance the background noise filtering performance of the white light interferometry(WLI), we demonstrate the noise filtering performance of preprocessing of the measured fringe signals. The WLI was realized through a mirau interferometer which was equipped with a green LED. When measuring large-height and rough surface objects, the illumination optics are considered the numerical aperture(NA) and the depth of focus(DOF). In this case, the limited NA of the illumination optics has a considerable impact on the interference fringe. Therefore, we propose a preprocessing method that uses the intensity difference between the measured intensity and the moving average intensity. The performance is demonstrated by measuring an array of metal solder balls fabricated on printed circuit board(PCB). The proposed method reduces the noise pixels by 15 percent.

Comparison of the Optical properties of Schematic Eyes by using the Seidel aberrations (자이델 수차를 이용한 모형안의 광학적 성능 비교)

  • Kim, Bong-Hwan;Lim, Hyeon-Seon;Ji, Taek-Sang
    • Journal of Korean Ophthalmic Optics Society
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    • v.9 no.2
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    • pp.269-280
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    • 2004
  • For the studying of the optical property of the human eye by using the Seidel aberrations with schematic eyes, we have used the several paraxial and fine schematic eyes. In another world, after fixing the iris ot aperture pinhole on the anterior of lens, we investigated how the surface contributions and the surface asphericity affected the optical properties of schematic eyes by using the Seidel aberration coefficients variation. Also, by analysis of dividing both a relaxed state and the accommodation state of the eye, we investigated the change of the optical properties during the change of accommodation.

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A Study on Improvement and Problem of Ready-made Reading Spectacles (상품화된 근용안경의 문제점 및 개선 방안에 관한 연구)

  • Lee, Hark Jun
    • Journal of Korean Ophthalmic Optics Society
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    • v.1 no.1
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    • pp.85-91
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    • 1996
  • This is a study of the measurement of inter papillary constance (P.D) in 702 old aged farmers (aged over 45) and the comparision of frame size and distance space of optical center (O.C) from 240 Ready-made Reading spectacles. The average of P.D in male (62.83mm) is greater than in female (61.18mm), and the O.C of Ready-made Reading spectacles of Plastic lens (71.2mm) longer than glass lens (70.8mm). The correction prism power by wearing Reading spectacles in male was 0.7prism to 3.6prism and in female was 0.9prism to 4.4prism. So the prism power in female is greater than in male.

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Development of Profilometry based on a Curvature Measurement (곡률에 근거한 형상 측정기술 개발)

  • Kim, Byoung-Chang
    • Korean Journal of Optics and Photonics
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    • v.18 no.2
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    • pp.130-134
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    • 2007
  • I present a novel curvature profilometer devised fur the profile measurement of aspheric and free-form surfaces on the nanometer scale. A profile is reconstructed from measuring the curvature of a test part of the surface at several locations along a line. For profile measurement of free-farm surfaces, methods based on local part curvature sensing have strong appeal. Unlike full-aperture interferometry they do not require customized null optics. The measurement accuracy of the curvature profilometer was assessed by comparison with a well-calibrated interferometer in NIST. Experimental results prove that the maximum discrepancy turns out to be 37 nm on the 28 mm measurement range for the spherical mirror.