• Title/Summary/Keyword: line laser

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A Study on a 3D Modeling for surface Inspection of a Moving Object (비등속 이동물체의 표면 검사를 위한 3D 모델링 기술에 관한 연구)

  • Ye, Soo-Young;Yi, Young-Youl;Nam, Ki-Gon
    • Journal of the Institute of Convergence Signal Processing
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    • v.8 no.1
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    • pp.15-21
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    • 2007
  • We propose a 3D modeling method for surface inspection of non-constant velocity moving object. 1'lie laser lines reflect tile surface curvature. We can acquire 3D surface information by analyzing projected laser lines on object. In this paper, we use multi-line laser to improve the single stripe method and high speed of single frame. Binarization and edge extraction of frame image were proposed for robust laser each line extraction. A new labeling method was used for laser line labeling. We acquired some feature points for image matching from the frame data and juxtaposed the frames data to obtain a 3D shape image. We verified the superiority of proposed method by applying it to inspect container's damages.

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Study on Printing Roll Manufacturing by using 3 Dimensional Laser Scanner (3차원 레이저 스캐너를 이용한 인쇄롤 가공에 관한 연구)

  • Kang, Heeshin;Noh, Jiwhan;Sohn, Hyonkee
    • Laser Solutions
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    • v.16 no.4
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    • pp.17-23
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    • 2013
  • The research for the development of roll-to-roll printing process is actively underway on behalf of the existing semiconductor process. The roll-to-roll printing system can make the electronic devices to low-cost mass production. This study is performed for developing the manufacturing technology of the printing roll used in the printing process of electronic devices. The indirect laser engraving technology is used to create printable roll and the printable roll is made out of the chrome coated roll after coating copper and polymer on the surface of steel roll, ablating the polymer on the surface of roll and etching the roll. The 3 dimensional laser scanner and roll rotating systems are constructed and the system control program is developed. We have used the fiber laser of 100 W grade, the 3 dimensional laser scanner and the 3 axes moving stage system with a rotating axis. We have found the optimal conditions by performing the laser patterning experiments and can make the minimum line width of $24{\mu}m$ by using the developed 3 dimensional laser scanner system.

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Die Manufacturing and Repair Using Laser-Aided Direct Metal Manufacturing (레이저 직접금속조형(DMM)기술에 의한 금형제작 및 보수)

  • 지해성;서정훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.104-107
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    • 2002
  • Direct Metal Manufacturing (DMM) is a new additive process that aims to take die making and metalworking in an entirely new direction. It is the blending of five common technologies : lasers, computer-aided design (CAD), computer-aided manufacturing (CAM), sensors and powder metallurgy. The resulting process creates parts by focusing an industrial laser beam onto a tool-steel work piece or platform to create a molten pool of metal. A small stream of powdered tool-steel metal is then injected into the melt pool to increase the size of the molten pool. By moving the laser beam back and forth, under CNC control, and tracing out a pattern determined by a computerized CAD design, the solid metal part is built line-by-line, one layer at a time. DMM produces improved material properties in less time and at a lower cast than is possible with traditional fabrication.

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Forming Characteristics of Laser Welded Tailored Blanks III : Stretch Forming Characteristics (레이저 용접 테일러드 블랭크의 기본 성형특성 III : 신장성형 특성)

  • Park, Gi-Cheol;Han, Su-Sik;Jin, Jo-Gwan;Gwon, O-Jun
    • Transactions of Materials Processing
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    • v.7 no.4
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    • pp.354-363
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    • 1998
  • In order to analyze the stretch forming characteristics of tailored blanks, laser welded blanks of different thickness and strength combinations were prepared and stretching tests were done. The stretching formability of laser welded blanks was reduced as increasing the deformation restraining force ($strength{\times}thickness$) ratio between two welded sheets. Weld line movement was attributed to strain concentration at weaker sheets and resulted in fracture at weaker sid, so that fracture could be predicted by the forming limit of the weak sheet. In the case of a welded blank with the similar deformation restraining force rations between two welded sheets, crack occurred at weld and its forming limit was about 15% less than the base sheet. The effects of lubrication and weld line position on stretch-ing formability were also investigated by experiments. Lower friction did not always give better formability for tailored blanks. Stretching formability was observed to be improved as increasing the area of weak sheet.

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A Survey Tool for the Measurements of the Rock Parting Surfaces (암반의 불연속면 배열을 측량하는 원격 영상측량기)

  • 황상기;임유진
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.11a
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    • pp.697-704
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    • 2000
  • This study presents methodology and tools for remote measurement of the orientation of the rock parting surfaces. Two close circuit video camera capture the pictures of a rock excavation surface while a laser beam scans the surface. Positions of the laser beams in the two digital images are recognized by image processing. Using the stereoscopic concept, three dimensional coordinations of the rock surface and the orientation of the rock parting planes are calculated. Point, cross and line type laser beams are tested for better image processing results and measurement accuracy of the coordinates. According to a simple accuracy test, cross beam show better results than the point beam. However, line beam show more promising results for the measurement of the rock parting surfaces.

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A Study on Generation of the Advanced Laser Scanning Path for Stereolithography using Voronoi Diagrams (Voronoi Diagram 을 이용한 Stereo;ithography 의 향상된 레이져 주사경로 생성에 관한 연구)

  • 이기현;최홍태;이석희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.405-409
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    • 1997
  • Voronoi diagrams are applied in varios field such as NC toolpath generation, VLSI design and robot path planning because of their geometric charcteristics. In this paper, Voronoi diagrams are introduced on polygon constructed by line segments only and with constant offset. Bisector curves for two arbitrary objects, which is the combination of line segment and arc, are defined as parametric fuction where the parameter is used as offset. Offset curves are applied on the generation of laser scanning path for the stereolithography and shows a good result from several examples.

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A Study on Automatic Seam Tracking of Arc Welding Using an Laser Displacement Sensor (레이져 변위센서를 이용한 용접선 자동추적에 관한 연구(2))

  • 양상민;조택동;전진환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.729-733
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    • 1997
  • Due to the variety of disturbance, it is not ease to accomplish the in-process detection of weld line with non-contact sensor. To get around this difficulties problem develop an automatic seam tracking weld system, the reliable signal processing algorithm has been recommanded. In this research, laser displacement sensor is applied as a seam finder in the automatic tracking system. The sensor is controlled by a dc servo motor which is mounted at X-Y moving table. X-Y moving table manipulated by an ac servo motor controls the position and velocity of the welding torch. First, X-Y table moves to Y-axis to search the welding joint feature before starting the welding, and welding joint is from the scanning data and weighting factor for each other. Second, weld line is determined using proposed signal processing algorithm during welding process. Form the experimental results, we could see the possibility that laser displacement sensor with procesed algorithm can be used as a seam finder in welding process under the severe noise (spatter,arc light etc.) condition

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Simple method for obtaining subnatural dip in Doppler-free laser spectroscopy

  • Kim, Jom-Sool;Kong, Hong-Jin
    • Proceedings of the Optical Society of Korea Conference
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    • 1991.06a
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    • pp.45-45
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    • 1991
  • We describe a simple method for obtaining a narrow dip with subnatural linewidth in Doppler-free laser spectroscopy. The method is based on detecting the absolute magnitude, |Re[$\chi$NL($\omega$-$\omega$o)]|, of the dispersive component (real part) of the nonlinear susceptibility induced by the pump beam, and the line shape recorded therefore exhibits a fully resolved technique and a dual phase lock-in amplifier, we have demonstrated the dip as narrow as 3 MHz in the laser-induced birefringence spectrum of the Na D1 line (natural linewidth 10 MHz). Possible spectroscopic applications are considered.

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레이저를 이용한 LCD 유리 절단 기술

  • Jeong, Jae-Yong;O, Dae-Hyeon;Yu, Gi-Ryong;Lee, Cheon;Lee, U-Yeong
    • Proceedings of the Korean Society Of Semiconductor Equipment Technology
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    • 2005.05a
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    • pp.219-223
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    • 2005
  • Nowadays laser cutting is the most promising method of cutting FPD(Flat Panel Display) glass in mass-production line. And this method can also be used to cut other brittle materials such as quartz, sapphire, ceramic and semiconductor The concept of this method is shown in picture 1. Laser beam heats glass up to strain point, not to melting point and cooling system chills glass to induce maximun thermal stress in glass surface and then the thermal stress generates micro thermal crack, in other words blind depth of crack, along laser beam and cooling line.

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A Study on Fabrication of Optical Waveguide using Laser Direct Writing Method (레이저 직접묘화기법에 의한 광도파로 제작에 관한 연구)

  • 신보성;김정민;김재구;조성학;장원석;양성빈
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.10a
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    • pp.391-394
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    • 2003
  • Laser direct writing process is developed 3rd harmonic Diode Pumped Solid State Laser with the near visible wavelength of 355 m sensitive polymer is irradiated by UV laser and developed using polymer solvent to obtain quasi-3D. It is important to reduce line width for image mode waveguides, so some investigations will be carried out in various conditions of process parameters such as laser power, writing speed, laser focus and optical properties of polymer. This process could be to fabricate a single mode waveguide without expensive mask projection method. Experimentally, the patterns of trapezoidal shape were manufactured into dimension of 8.4 mm width and 7.5 mm height. Propagation loss of straight waveguide measured 3 dB/cm at 1,550 nm.

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