• Title, Summary, Keyword: Laser Scanner

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A study on the design of the laser marking system using galvanometer scanner (갈바노미터 스캐너를 이용한 레이저 마킹 시스템 설계 제작에 관한 연구)

  • 조태익;이건이
    • 제어로봇시스템학회:학술대회논문집
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    • pp.145-148
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    • 1986
  • To perform the marking on metal with high speed and non-contact using the laser beam of high energy, laser marking system is designed and fabricated applying the galvanometer scanner capable of high speed-precise beam positioning controlled by microprocessor. Laser is a Q-switched Nd:YAG producing multi-mode, wavelength, 1060nm. Optical system is composed of beam expander, scanning mirror and flat field lens. Consequently, the laser marking is satisfactorily achieved regardless of kinds of metal.

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Development of Color 3D Scanner Using Laser Structured-light Imaging Method

  • Ko, Youngjun;Yi, Sooyeong
    • Current Optics and Photonics
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    • v.2 no.6
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    • pp.554-562
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    • 2018
  • This study presents a color 3D scanner based on the laser structured-light imaging method that can simultaneously acquire 3D shape data and color of a target object using a single camera. The 3D data acquisition of the scanner is based on the structured-light imaging method, and the color data is obtained from a natural color image. Because both the laser image and the color image are acquired by the same camera, it is efficient to obtain the 3D data and the color data of a pixel by avoiding the complicated correspondence algorithm. In addition to the 3D data, the color data is helpful for enhancing the realism of an object model. The proposed scanner consists of two line lasers, a color camera, and a rotation table. The line lasers are deployed at either side of the camera to eliminate shadow areas of a target object. This study addresses the calibration methods for the parameters of the camera, the plane equations covered by the line lasers, and the center of the rotation table. Experimental results demonstrate the performance in terms of accurate color and 3D data acquisition in this study.

Development of Nd-Yag Laser Marking System for Cylinderical Parts (Nd-Yag 레이저를 이용한 원통 형상 표면 마킹 시스템 개발)

  • Lee, Se-Han;Kang, Jae-Gwan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.5
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    • pp.70-75
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    • 2010
  • In this paper, laser marking systems dedicated to cylinderical parts was developed. We first develop the marking device which consists of Nd-Yag laser, galvano scanner and additional rotational axis, then develop algorithm for supporting the digital image with bmp data format. Additional rotational axis is so attached as to rotate the cylinderical parts for marking its whole surface. The image is separated into line by line and the separated line image is sent to galvano scanner while rotating the additional axis simultaneously. CxImage library, famous open source code, is employed for the image processing. The developed method was tested with various images and shows that it reduces marking time significantly without reducing marking quality.

Development of Film Scanner using Laser (레이저를 이용한 필름 스캐너의 개발)

  • Chee, Young-Joon;Park, Kwang-Suk
    • Proceedings of the KOSOMBE Conference
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    • v.1994 no.12
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    • pp.101-103
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    • 1994
  • The film scanner that digitizes the conventional x-ray films is the necessary equipment in the transition period of going to the filmless hospital. We have developed the film scanner using laser. We have selected HeNe laser as light source. The polygonal mirror converts the point light source to line scanning light. In sensing part, the diffusing cylinder and 7 photo transistors converts the light signal which passing the film into the electric signal. With this scanner, we can scan successfully the conventional x-ray film by $1024\times1024$. Smaller the spot sire is, higher the resolution can be achieved.

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A 3D Foot Scanner Using Mirrors and Single Camera (거울 및 단일 카메라를 이용한 3차원 발 스캐너)

  • Chung, Seong-Youb;Park, Sang-Kun
    • Korean Journal of Computational Design and Engineering
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    • v.16 no.1
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    • pp.11-20
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    • 2011
  • A structured beam laser is often used to scan object and make 3D model. Multiple cameras are inevitable to see occluded areas, which is the main reason of the high price of the scanner. In this paper, a low cost 3D foot scanner is developed using one camera and two mirrors. The camera and two mirrors are located below and above the foot, respectively. Occluded area, which is the top of the foot, is reflected by the mirrors. Then the camera measures 3D point data of the bottom and top of the foot at the same time. Then, the whole foot model is reconstructed after symmetrical transformation of the data reflected by mirrors. The reliability of the scan data depends on the accuracy of the parameters between the camera and the laser. A calibration method is also proposed and verified by experiments. The results of the experiments show that the worst errors of the system are 2 mm along x, y, and z directions.

Obstacle Detection using Laser Scanner and Vision System for Path Planning on Autonomous Mobile Agents (무인 이동 개체의 경로 생성을 위한 레이저 스캐너와 비전 시스템의 데이터 융합을 통한 장애물 감지)

  • Jeong, Jin-Gu;Hong, Suk-Kyo;Chwa, Dong-Kyoung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.7
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    • pp.1260-1272
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    • 2008
  • This paper proposes object detection algorithm using laser scanner and vision system for the path planning of autonomous mobile agents. As the scanner-based method can observe the obstacles in only two dimensions, it is hard to detect the shape and the number of obstacles. On the other hand, vision-based method is sensitive to the environment and has its difficulty in the accurate distance measurement. Thus, we combine these two methods based on K-means algorithm such that the obstacle avoidance and optimal path planning of autonomous mobile agents can be achieved.

3D Modelling of Moblie Part Using OPTO- Top Pattern Scanner (OPTO-Top패턴주사기에 의한 자동차부품의 3차원모델링)

  • 한승희;오원진;배연성
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • pp.291-298
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    • 2004
  • Effective 3 dimensional modelling is to be essential work for design of construction, mechanic and industrial part. Especially, it makes possible for reverse design. It need rapidity, accuracy, reality. Data acquisition method for modelling are contact 3dimensional measurement system, LASER scanner, Pattern scanner, and digital photogrammetry. This study introduce to 3 dimensional modelling methods and analysis of these method. We tried to 3D modelling of automobile part using OPTO-Top pattern scanner which system have rapidity and accuracy, and compared effectiveness of each method. The 3D display web environment was made.

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Laser Scanning Technology for Ultrasonic Horn Location Compensation to Modify Nano-size Grain (나노계면 형성을 위한 초음파 진동자 위치보정을 위한 레이저 스캐닝 기술)

  • Kim, Kyugnhan;Lee, Jaehoon;Kim, Hyunse;Park, Jongkweon;Yoon, Kwangho
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.12
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    • pp.1121-1126
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    • 2014
  • To compensate location error of ultrasonic horn, the laser scanning system based on the galvanometer scanner is developed. It consists of the 3-Axis linear stage and the 2-Axis galvanometer scanner. To measure surface shape of three-dimensional free form surface, the dynamic focusing unit is adopted, which can maintain consistent focal plane. With combining the linear stage and the galvanometer scanner, the scanning area is enlarged. The scanning CAD system is developed by stage motion teaching and NURBS method. The laser scanning system is tested by marking experiment with the semi-cylindrical sample. Scanning accuracy is investigated by measured laser marked line width with various scanning speed.

Obstacle Detection and Classification Algorithm of Mobile Robots using a Single Laser Scanner (단일 레이저 스캐너를 이용한 모바일 로봇의 장애물 탐색 및 분리 알고리즘)

  • Lee, Gi-Roung;Chwa, Dong-Kyoung;Hong, Suk-Kyo
    • Proceedings of the KIEE Conference
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    • pp.385-386
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    • 2007
  • This paper proposes obstacle detection and classification algorithm using a single laser scanner. The proposed algorithm searches the object singular points using a differential equation, and finds obstacle singular points shows a boundary of obstacle. And the proposed algorithm can classify object even if several obstacles overlapped. Simulation results show the feasibility of proposed algorithm using a single laser scanner, not using several laser scanners.

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