• Title/Summary/Keyword: Geometric optics

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Geometric and Wave Optic Features in the Optical Transmission Patterns of Injection-molded Mesoscale Pyramid Prism Patterned Plates

  • Lee, Je-Ryung;Je, Tae-Jin;Woo, Sangwon;Yoo, Yeong-Eun;Jeong, Jun-Ho;Jeon, Eun-chae;Kim, Hwi
    • Current Optics and Photonics
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    • 제2권2호
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    • pp.140-146
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    • 2018
  • In this paper, mesoscale optical surface structures are found to possess both geometric and wave optics features. The study reveals that geometric optic analysis cannot correctly predict the experimental results of light transmission or reflection by mesoscale optical structures, and that, for reliable analyses, a hybrid approach incorporating both geometric and wave optic theories should be employed. By analyzing the transmission patterns generated by the mesoscale periodic pyramid prism plates, we show that the wave optic feature is mainly ascribed to the edge diffraction effect and we estimate the relative contributions of the wave optic diffraction effect and the geometric refraction effect to the total scattering field distribution with respect to the relative dimension of the structures.

사각방지용 자동차 측면거울의 개발에 관한 연구 (A Study on the Sculptured surface mold by using CAM system)

  • 신근하
    • 한국생산제조학회지
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    • 제9권2호
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    • pp.119-124
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    • 2000
  • In this paper based on geometric optics and geometric modeling aspheric surface of the side mirror mold with dead angle reduced have been designed and machined in a CNC machining center, Surface roughness of the mold was evaluat-ed by usin the surface shaping system. Surface generating simulation of a ball endmill process is investigated. Through the simulation based on the surface-shaping system 3-D engineered surfaces and properties of engineered surfaces are obtained, Computer simulation provides the effective working conditions through the prediction of geometric properties of engineered surfaces. The rear view mirror and room mirror play important role on the safe driving condition as a observation of environment but the rear view mirror can not provide complete information of driving environments due to the existence of the dead angle. The analysis on the shape of formed mirror shows that the proposed me? improves range of a driver's sight.

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GPU를 이용한 반복적 물리 광학법의 가속화에 대한 연구 (Acceleration of the Iterative Physical Optics Using Graphic Processing Unit)

  • 이용희;진희철;김경태
    • 한국전자파학회논문지
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    • 제26권11호
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    • pp.1012-1019
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    • 2015
  • 본 논문은 공동구조의 RCS(Radar Cross Section)을 계산하는 반복적 물리 광학법(Iterative Physical Optics: IPO)의 연산속도를 가속하는 기법들을 효과적으로 적용하는 방법을 제시한다. IPO는 기존에 공동 구조 내부에서 발생하는 다중 반사 효과 계산 시 기하 광학법(Geometric Optics: GO)를 사용하는 SBR(Shooting and Bouncing Rays)과는 달리 근거리 필드 식을 활용하기 때문에 정확도가 향상된 산란 계산이 가능하다. 하지만 PO(Physical Optics)에 비해 크게 느리며, 실질적인 사용을 위해서는 계산속도의 향상을 위한 기법이 필요하다. 이를 해결하기 위해 IPO에서 특징적으로 사용되는 반복적 부분을 GPU(Graphic Processing Unit)으로 계산하고, AIPO-CR(Adaptive Iterative Physical Optics-Change Rate)으로 반복횟수를 최적화하여 효과적으로 연산속도를 향상시킨다.

Compact Catadioptric Wide Imaging with Secondary Planar Mirror

  • Ko, Young-Jun;Yi, Soo-Yeong
    • Current Optics and Photonics
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    • 제3권4호
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    • pp.329-335
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    • 2019
  • Wide FOV imaging systems are important for acquiring rich visual information. A conventional catadioptric imaging system deploys a camera in front of a curved mirror to acquire a wide FOV image. This is a cumbersome setup and causes unnecessary occlusions in the acquired image. In order to reduce both the burden of the camera deployment and the occlusions in the images, this study uses a secondary planar mirror in the catadioptric imaging system. A compact design of the catadioptric imaging system and a condition for the position of the secondary planar mirror to satisfy the central imaging are presented. The image acquisition model of the catadioptric imaging system with a secondary planar mirror is discussed based on the principles of geometric optics in this study. As a backward mapping, the acquired image is restored to a distortion-free image in the experiments.

첨단 자동차용 거울의 금형에 관한 연구 (A study on the advanced mirror mold for automobile)

  • 홍민성;백철승
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1999년도 춘계학술대회 논문집
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    • pp.134-140
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    • 1999
  • The side mirrors play an important role in driver's safety and convenience. People drive safely based on the side mirrors and room mirror through observation of environment. However, the drivers can not completely confront environments because of the dead angle of the side mirrors. In this research, based on geometric optics and geometric modeling, aspheric surfaces of the side mirror mold with dead angle free has been designed and machined in CNC machining center, Surface roughness of the mold was evaluated by using surface shaping system. The analysis on the shape of formed mirrors shows the mirrors have been reduced the dead angle comparing with the original mold.

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광학스캐닝 메커니즘 및 근적외선 카메라 광학계를 이용한 태양전지 웨이퍼 검사장치 개발 (Development of Inspection System With Optical Scanning Mechanism and Near-Infrared Camera Optics for Solar Cell Wafer)

  • 김경범
    • 반도체디스플레이기술학회지
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    • 제11권3호
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    • pp.1-6
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    • 2012
  • In this paper, inspection system based on optical scanning mechanism is designed and developed for solar cell wafer. It consists of optical scanning mechanism, NIR camera optics, machinery and control system, algorithm of defect detection and software. Optical scanning mechanism is composed of geometrical camera optics and structured hybrid illumination system. It is used to inspection of surface defects. NIR camera optics is used for inspection of defects inside solar cell wafer. It is shown that surface and internal micro defects can be detected in developed inspection system for solar cell wafer.

Improving the Capture-range Problem in Phase-diversity Phase Retrieval for Laser-wavefront Measurement Using Geometrical-optics Initial Estimates

  • Li, Li Jie;Jing, Wen Bo;Shen, Wen;Weng, Yue;Huang, Bing Kun;Feng, Xuan
    • Current Optics and Photonics
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    • 제6권5호
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    • pp.473-478
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    • 2022
  • To overcome the capture-range problem in phase-diversity phase retrieval (PDPR), a geometrical-optics initial-estimate method is proposed to avoid a local minimum and to improve the accuracy of laser-wavefront measurement. We calculate the low-order aberrations through the geometrical-optics model, which is based on the two spot images in the propagation path of the laser, and provide it as a starting guess for the PDPR algorithm. Simulations show that this improves the accuracy of wavefront recovery by 62.17% compared to other initial values, and the iteration time with our method is reduced by 28.96%. That is, this approach can solve the capture-range problem.

Object Precision 방법을 이용한 복합 구조물의 RCS 해석 (RCS Analysis of Complex Structures Using Object Precision Method)

  • 김국현;김진형;조대승
    • 대한조선학회논문집
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    • 제42권2호
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    • pp.159-164
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    • 2005
  • Monostatic RCS analysis of complex structures has been done with a combined method of physical and geometric optics, commonly applied to high frequency electromagnetic backscattering problems. In the analysis, the complex structure is modeled as a number of flat surfaces and the RCS of whole structure is calculated by summing RCS of each surface, which can be obtained from an analytical solution of flat surface phase integral derived from physical optics. The reflected and hidden surfaces are searched by an object precision method based on adaptive triangular beam method, which can take account for effects of multiple reflections and polarizations of electromagnetic wave. The validity of the presented RCS analysis method has been verified by comparing with exact solutions and measured data for various structures.

Development of a Fast Alignment Method of Micro-Optic Parts Using Multi Dimension Vision and Optical Feedback

  • Han, Seung-Hyun;Kim, Jin-Oh;Park, Joong-Wan;Kim, Jong-Han
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2003년도 ICCAS
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    • pp.273-277
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    • 2003
  • A general process of electronic assembly is composed of a series of geometric alignments and bonding/screwing processes. After assembly, the function is tested in a following process of inspection. However, assembly of micro-optic devices requires both processes to be performed in equipment. Coarse geometric alignment is made by using vision and optical function is improved by the following fine motion based on feedback of tunable laser interferometer. The general system is composed of a precision robot system for 3D assembly, a 3D vision guided system for geometric alignment and an optical feedback system with a tunable laser. In this study, we propose a new fast alignment algorithm of micro-optic devices for both of visual and optical alignments. The main goal is to find a fastest alignment process and algorithms with state-of-the-art technology. We propose a new approach with an optimal sequence of processes, a visual alignment algorithm and a search algorithm for an optimal optical alignment. A system is designed to show the effectiveness and efficiency of the proposed method.

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