• Title/Summary/Keyword: Retroreflector

Search Result 19, Processing Time 0.032 seconds

Analysis on Glass-Bead Type Retroreflector's Optical Characteristics (유리구슬형 재귀반사기의 광학적 특성 해석)

  • Lee, E.H.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.11 no.4
    • /
    • pp.165-173
    • /
    • 1994
  • Retroreflector is different from other reflecting surfaces as it mades reflection in which radiation is returned in directions close to its incoming direction. Because of this characteristics, retroreflectors find many applications in traffic safety related areas. Retroreflectors are usually made using comer cubes, or partially coated glass beads. These glass beads can be made very small, so that they can be coated on sheets or mixed with paints. The design of glass type retroreflector depends on glass bead's shape and material, and its optical characteristics are related to the refractive index of glass. In this paper, a method of anlyzing glass bead type retroreflector's sptical characteristics with respect to shape and optica property of the glass, is presented. First, the coefficient of retroreflection, which is a measure of retroreflector's optical characteristics, is derived analytically using geometrical optics method. And the result is plotted using numerical methods. The results show good match with those obtained experimentally, which were supplied from a commercial retroreflector manufacturer.

  • PDF

Protoflight Model Development of Retroreflector Array for STSAT-2 (과학기술위성2호 레이저반사경의 준비행모델 개발)

  • Lee, Sang-Hyun;Kim, Kyung-Hee;Lee, Jun-Ho;Jin, Jong-Han;Kim, Hyung-Myung
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.35 no.12
    • /
    • pp.1135-1142
    • /
    • 2007
  • STSAT-2 has an on-board satellite retroreflector array for precise orbit determination. Satellite retroreflector array reflects photon emitted from laser and uses to determine precisely the distance from ground station to satellite by the round-trip travel time of photon. The retroreflector array of protoflight model has been developed and verified through environmental tests. This paper describes the protoflight model of retroreflector array and reports environmental test results. The environmental tests of protoflight model retroreflector array were performed successfully without damage of corner cube prism occurred in engineering model development.

Link Budget Analysis of Laser Retroreflector Array for KOMPSAT-5 (다목적실용위성5호 레이저반사경의 Link Budget 분석)

  • Lee, Sang-Hyun;Kim, Kyung-Hee;Lee, Jun-Ho;Jin, Jong-Han;Lim, Hyung-Chul;Park, Jong-Uk
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.36 no.1
    • /
    • pp.92-99
    • /
    • 2008
  • KOMSAT-5 will attach an laser retroreflector array for precise orbit determination. Laser retroreflector array was developed by DFZ in Germany and have pyramid type composed of four corner cube prisms. In this paper, the performance analyses as effective area of retroreflector and photons measured by link budget and position of ground station were performed.

Development of straightness measurement system for flat workpiece (평면 공작물의 진직도 측정 시스템 개발)

  • 김현수;조명동;장문주;홍성욱;박천홍
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2001.04a
    • /
    • pp.203-206
    • /
    • 2001
  • This paper presents a straightness measurement system for flat and long workpieces. The measurement system consists of a laser optical unit, a CCD camera and processing system, and a carrier system with a stylus. The carrier system accompanies the stylus, which displaces a retroreflector along the surface profile. The optical unit is used to optically amplify the displacement of retroreflector. The CCD camera and processing system finally identifies the vertical displacement of the stylus unit. The developed system is applied to two surfaces: ground surface and LM guide surface. The experimental results show that the developed system can measure the straightness of flat surfaces within sub-micron error.

  • PDF

Development of Straightness Measurement System thor Flat Workpieces (평면 공작물 진직도 측정 시스템 개발에 관한 연구)

  • Kim, Hyeon-Su;Jang, Mun-Ju;Hong, Seong-Uk;Park, Cheon-Hong
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.19 no.3
    • /
    • pp.107-113
    • /
    • 2002
  • This paper presents a straightness measurement system for flat and long workpieces. The measurement system consists of a laser, a CCD camera and processing system, a carrier system with a stylus, and some optical units. The carrier system accompanies the stylus, which displaces and retroreflector along the surface profile. The optical unit is used to optically amplify displacement of the stylus unit. The developed system is applied to a ground surface and a LM guide unit. The experimental results show that the developed system can measure the straightness of flat surface and moving systems.

Development of On-machine Flatness Measurement Method (평면도 기상 측정 방법 개발)

  • 장문주;홍성욱
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.20 no.3
    • /
    • pp.187-193
    • /
    • 2003
  • This paper presents an on-machine measurement method of flatness error fur surface machining processes. There are two kinds of on-machine measurement methods available to measure flatness errors in workpieces: i.e., surface scanning method and sensor scanning method. However, motion errors are often engaged in both methods. This paper proposes an idea to realize a measurement system of flatness errors and its rigorous application for estimation of motion errors of the positioning system. The measurement system is made by modifying the straightness measurement system, which consists of a laser, a CCD camera and processing system, a sensor head, and some optical units. The sensor head is composed of a retroreflector, a ball and ball socket, a linear motion guide unit and adjustable arms. The experimental .results show that the proposed method is useful to identify flatness errors of machined workpieces as well as motion errors of positioning systems.

Reflection-type Three-dimensional Screen using Retroreflector

  • Song, Byoungsub;Choi, Sungwon;Sung, Hyunsik;Min, Sung-Wook
    • Journal of the Optical Society of Korea
    • /
    • v.18 no.3
    • /
    • pp.225-229
    • /
    • 2014
  • A reflection-type three-dimensional (3D) screen using retroreflector is proposed to improve the visibility of a projected 3D image while keeping its perspective. For the projection-type 2D display, the diffuser is used to represent the 2D scene, overcoming the limitation of the aperture of the projection lens set. If the diffuser is adopted for the projected 3D image, only 2D images sectioned and blurred should be displayed on the screen. The proposed screen can make the 3D image with the aperture limitation visible to be applied to the 3D image projection systems. The feasibility of the proposed screen is verified by experiments.

Piezo-electrically Actuated Micro Corner Cube Retroreflector (CCR) for Free-space Optical Communication Applications

  • Lee, Duk-Hyun;Park, Jae-Y.
    • Journal of Electrical Engineering and Technology
    • /
    • v.5 no.2
    • /
    • pp.337-341
    • /
    • 2010
  • In this paper, an extremely low voltage operated micro corner cube retroreflector (CCR) was fabricated for free-space optical communication applications by using bulk silicon micromachining technologies. The CCR was comprised of an orthogonal vertical mirror and a horizontal actuated mirror. For low voltage operation, the horizontal actuated mirror was designed with two PZT cantilever actuators, torsional bars, hinges, and a mirror plate with a size of $400{\mu}m{\times}400{\mu}m$. In particular, the torsional bars and hinges were carefully simulated and designed to secure the flatness of the mirror plate by using a finite element method (FEM) simulator. The measured tilting angle was approximately $2^{\circ}$ at the applied voltage of 5 V. An orthogonal vertical mirror with an extremely smooth surface texture was fabricated using KOH wet etching and a double-SOI (silicon-on-insulator) wafer with a (110) silicon wafer. The fabricated orthogonal vertical mirror was comprised of four pairs of two mutually orthogonal flat mirrors with $400{\mu}m4 (length) $\times400{\mu}m$ (height) $\times30{\mu}m$ (thickness). The cross angles and surface roughness of the orthogonal vertical mirror were orthogonal, almost $90^{\circ}$ and 3.523 nm rms, respectively. The proposed CCR was completed by combining the orthogonal vertical and horizontal actuated mirrors. Data transmission and modulation at a frequency of 10 Hz was successfully demonstrated using the fabricated CCR at a distance of approximately 50 cm.