• Title, Summary, Keyword: 레이저스캐닝

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Development of An Automated Scanning Laser Doppler Vibrometer for Measurements of In-Plane Structural Vibration (평면 구조 진동 측정을 위한 자동화된 스캐닝 레이저 도플러 진동측정기의 개발 및 연구)

  • Kil, Hyun-Gwon
    • Journal of KSNVE
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    • v.7 no.2
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    • pp.231-238
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    • 1997
  • An automated scanning laser Doppler vibrometer (LDV) has been designed, and built to measure in-plane vibration fields over structures. Use of optical fibers allows the compact design of a laser probe head which can be scanned over the vibrating structures. An algorithm for automated self-alignment of the laser probe is developed. The system is completely automated for scanning over the structures, focusing two laser beams at each data point until the detected vibration signal is stable, and for recording and transferring the data to a system computer. The automated system allows one to get extensive data of the vibration field over the structures. The system is tested by scanning a piezoelectric cylindrical shell and a plate excited by a continuous signal and by a pulse signal, respectively. Results show that the automated scanning LDV system can be a useful tool to measure the in-plane vibration field and to detect the elastic waves propagating on the vibrating structures.

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Head Fixed Type Multi-Focus Display System Using Galvano-Scanner and DMD(Digital Micro-Mirror Device) (갈바노 스캐너와 DMD(Digital Micro-mirror Device)를 이용한 두부 고정형 다초점 디스플레이 시스템)

  • Kim, Dong-Wook;Kwon, Yong-Moo;Kim, Sung-Kyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.10B
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    • pp.1117-1123
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    • 2009
  • Head fixed type multi-focus display system using Galvano-scanner and DMD(Digital Micro-mirror Device), which is able to perfectly accommodate, can solve eye fatigue due to conflict between convergence eye movement and accommodation action in stereoscopic display. This system is able to accommodate through making convergence point about each view point and offering it in front of observer's pupil by using laser scanning method. In this paper, we analyzed laser scanning method of this multi-focus display system. And multi-focus display system based on this analysis was made, which showed that focus adjustment was possible through video camera. As a result, formation principle of view point of multi-focus system by laser scanning method was verified.

Displacement Measurement of Structure using Regression Analysis from Coordinates Information of Laser Scanning (레이저 스캐닝 좌표정보로부터 회기분석 기법을 이용한 구조물의 변위 계측)

  • Hong, Jeong-Beom;Lee, Hong-Min;Park, Hyo-Seon
    • 한국방재학회:학술대회논문집
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    • pp.34.1-34.1
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    • 2010
  • TLS(Terrestrial Laser Scanning)는 레이저를 이용하여 물체의 3차원 위치 정보를 원격으로 획득할 수 있는 시스템이다. 그러나 TLS로부터 획득한 3차원 위치 정보는 처짐 또는 응력 평가 등에 있어서 구조 정보로서 사용하기에는 한계가 있다. 따라서 정밀한 형상정보의 획득을 위해서는 3차원 형상 좌표 정보에 대한 적절한 데이터 처리가 필요하다. 본 연구에서는 구조물에 작용하는 하중 또는 지점 조건에 대한 정보 없이 회기분석의 중첩을 이용하여 TLS로부터 얻은 대상물의 이산화 된 위치 정보로 부터 구조물의 정밀한 변형 형상을 추정할 수 있는 방법을 제시한다.

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Design of 3D Printer Based on SLA Using LSU and Test of Scanning Mechanism (LSU를 이용한 SLA 방식의 3D프린터 설계 및 스캐닝 기구부 동작 테스트)

  • Jang, Min;Oh, Am-Suk
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.6
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    • pp.1225-1230
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    • 2017
  • 3D printers have been growing mainly in industrial use, but the recent growth of the personal 3D printer market advanced through economic effects and cost reduction due to technological development. However, current 3D personal printers are very low in customer satisfaction on the limitations of molding speed, size, and precision. In this paper, we propose SLA 3D printer using LSU to overcome the technical limitation of personal 3D printer. In order to verify the operation of the scanning mechanism which is responsible for core functions, the movement of molding board using stepping motor and laser output test was conducted. These tests ensure that the laser was operating and control well was confirmed that a certain point is output to the X-axis by means of a laser module and a polygon mirror. 3D printers which are proposed to improve the accuracy and manufacturing speed is expected to replace the traditional low-budget 3D printer.

Fabrication of Scanning Fixture for Flexible Panels (유연 판넬의 스캐닝 고정구 제작)

  • Yin, Jeong-Je
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.11
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    • pp.4080-4086
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    • 2010
  • In this study, a scanning fixture for flexible parts such as large automotive panels is developed. For the minimization of the weight deflection of a hood outer panel, the N-2-1 fixture principle for flexible parts is adopted in the fixture design. The designed fixture for a hood outer panel is fabricated using the Alufix system. The springback of the entire hood outer panel can be measured successfully by the laser scanning with the developed fixture, which verifies the usefulness of the proposed design method for the flexible panels.

3D Indoor Modeling Based on Terrestrial Laser Scanning (지상레이저스캐닝 기반 3차원 실내 모델링)

  • Hong, Seung Hwan;Cho, Hyoung Sig;Kim, Nam Hoon;Sohn, Hong Gyoo
    • Journal of The Korean Society of Civil Engineers
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    • v.35 no.2
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    • pp.525-531
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    • 2015
  • According to the increasing demand for 3D indoor spatial information, the utilization of a terrestrial laser scanner comes to the fore. However, the research for the comparison between a terrestrial laser scanning method and a traditional surveying method is insufficient. The paper evaluated the time-efficiency and the locational accuracy of an AMCW type and a direct TOF type of terrestrial laser scanning methods in comparison with the observation using a total station. As a result, an AMCW type showed higher time-efficiency than a direct TOF type and the RMSE between the two types of data was ${\pm}1mm$. Moreover, the terrestrial laser scanning method showed twice higher time-efficiency than the observation using a total station and the RMSE between the two data was ${\pm}3.4cm$. The results indicate that the terrestrial laser scanning method has better profitability and performance for 3D indoor modeling than the traditional survey using a total station. In the future, a terrestrial laser scanner can be efficiently utilized in the construction of 3D indoor spatial information.

A Continuous Scanning Laser Doppler Vibrometer for Mode Shape Analysis (모드형상분석을 위한 연속 스캐닝 레이저 도플러 진동측정기)

  • Park, Kyi-Hwan;Choi, Ji-Eun;La, Jong-Pil;Wang, Sem-Yung;Kyoung, Yong-Soo;Kim, Koung-Suk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.5
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    • pp.734-741
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    • 2003
  • This paper addresses the vibration mode shape Measurement technique utilizing a Continuous Scanning Laser Doppler Vibrometer (CSLDV). The continuous scanning capability is added to the conventional discrete Laser Doppler Vibrometer by reflecting the laser beams on the surface of the object using two oscillating mirrors. The bow scanning resulted from the proposed scanning method is eliminated by feedback control. The velocity output signal from the CSLDV is modulated to give the spatial velocity distribution in terms of coefficients which are obtained from the Fast Fourier Transformation of the time dependent velocity signal. Using the Chebyshev series from, the analysis of the vibration mode shape techniques for straight line scanning and 2 dimensional scanning are presented and discussed. The performance of the proposed SLDV is presented using the experimental results of the vibration mode shape of a cantilever and plate