• Title, Summary, Keyword: 레이저스캐닝

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Development of the 3D Imaging System and Automatic Registration Algorithm for the Intelligent Excavation System (IES) (지능형 굴삭 시스템을 위한 모바일 3D 이미징 시스템 및 자동 정합 알고리즘의 개발)

  • Chae, Myung-Jin;Lee, Gyu-Won;Kim, Jung-Ryul;Park, Jae-Woo;Yoo, Hyun-Seok;Cho, Moon-Young
    • Korean Journal of Construction Engineering and Management
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    • v.10 no.1
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    • pp.136-145
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    • 2009
  • The objective of the Intelligent Excavation System (IES) is to recognize the work environment and produce work plan and automatically control the excavator through integrating sensor and robot technologies. This paper discusses one of the core technologies of IES development project, development of 3D work environment modeling. 3D laser scanner is used for 3-dimensional mathematical model that can be visualized in virtual space in 3D. This paper describes (1) how the most appropriate 3D imaging system has been chosen; (2) the development of user interface and customization of the s/w to control the scanner for IES project; (3) the development of the mobile station for the scanner; (4) and the algorithm for the automatic registration of laser scan segments for IES project. The development system has been tested on the construction field and lessons learned and future development requirements are suggested.

Measurement of minimum line width of an object fabricated by metal 3D printer using powder bed fusion type with stainless steal powder (스테인리스강을 사용한 분말 적층 용융 방식의 금속 3차원 프린터에서 제작된 물체의 최소 선폭 측정)

  • Son, BongKuk;Jeong, Youn Hong;Jo, Jae Heung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.10
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    • pp.346-351
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    • 2018
  • Metal three-dimensional (3D) printing technologies are mainly classified as powder bed fusion (PBF) and direct energy deposition (DED) methods according to the method of application of a laser beam to metallic powder. The DED method can be used to fabricate fine and hard 3D metallic structures by applying a strong laser beam to a thin layer of metallic powder. The PBF method involves slicing 3D graphics to be a certain height, laminating metal powders, and making a 3D structure using a laser. While the DED method has advantages such as laser cladding and metallic welding, it causes problems with low density when 3D shapes are created. The PBF method was introduced to address the structural density issues in the DED method and makes it easier to produce relatively dense 3D structures. In this paper, thin lines were produced by using PBF 3D printers with stainless-steel powder of roughly $30{\mu}m$ in diameter with a galvano scanner and fiber-transferred Nd:YAG laser beam. Experiments were carried out to find the optimal conditions for the width of a line depending on the processing times, laser power, spot size, and scan speed. The optimal conditions were two scanning processes in one line structure with a laser power of 30 W, spot size of $28.7{\mu}m$, and scan speed of 200 mm/s. With these conditions, a minimum width of about $85.3{\mu}m$ was obtained.

Investigation about unexpected effects of Chebyshev and Hilbert approach on using CSLDV (연속 스캐닝 진동계를 위한 체비세프와 힐버트 방식의 비교)

  • 왕세명;경용수;박기환;라종필;김경석;강기수;김창식
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.414-419
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    • 2003
  • There are some methods fur extracting mode shapes from a continuously scanned data such as a modulation, Chebyshev polynomial, and Hilbert approach. In this paper, Chebyshev and Hilbert approaches were investigated through the numerical experiment first. As some experimental parameters were altered with small quantities, data were checked and plotted. From those results, the effects of unexpected parameters will be configured. And then, it will be actually helpful to select the proper method for specific testing environments.

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Mode Shape Reconstruction of an impulse excited structure using HHT and CSLDV (HHT와 연속스캐닝 진동계를 이용한 임펄스가진된 구조물의 모드 형상 복원)

  • Kyong, Yong-Soo;Kim, Dae-Sung;Dayou, Jedol;Park, Kyi-Hwan;Wang, Se-Myung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.484-490
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    • 2008
  • For CSLDV, the Chebyshev demodulation (or polynomial) technique and Hilbert transform approach have been used for mode shape reconstruction with harmonic excitation. In this paper, the Hilbert-Huang transform approach was applied as an alternative to impact excitation cases in terms of a numerical approach. The vibration of the tested structure is modeled using impulse response functions. In order to verify this technique, a simply supported beam was chosen as the test rig. With additional innovative steps which are the ideal-band pass filter and the nodal point determination, Hilbert-Huang transformation can be used for a good mode shape reconstruction even in the impact excitation case.

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PWM-coded pattern projection for structured light range imaging (구조 광 범위 영상을 위한 PWM 코드 패턴 투영)

  • Bae, Sang-Min;Kim, Dae-Yong;Koh, Kwang-Sik
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.478-481
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    • 2012
  • 구조 광을 이용한 3차원 정보 획득 방법으로는 레이저 스캐닝 기술과 다양한 패턴을 투영 기술, 그리고 컬러 패턴을 이용한 기술 등이 존재한다. 여러 장의 이진 패턴을 사용하는 경우, 여러 장의 패턴영상을 영속적으로 투영해야 하므로 움직이는 물체가 있는 경우 3차원 복원이 불가능한 단점을 지니고 있으며, 이를 보안하기 위해 그레이 혹은 컬러 패턴을 사용하여 패턴의 영상수를 줄일 수는 있으나, 이 경우엔 깊이 맵의 해상도의 한계와 컬러 오브젝트로 인한 에러 발생 문제가 발생 한다. 본 논문에서는 PWM(Pulse Width Modulation)방식을 이용하여 이진 패턴과 컬러 패턴의 문제점을 보완할 수 있게 단일 영상, 즉 "One-Shot"으로 스캐닝 하는 알고리즘을 제시한다.

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Application of 3-D Laser Scanner for the Measurement of Slope Displacement (사면 변형 측정을 위한 3차원 레이저 스캐너의 적용)

  • Oh, Seok-Hoon;Suh, Baek-Soo
    • Journal of the Korean earth science society
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    • v.31 no.6
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    • pp.555-562
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    • 2010
  • Three-dimensional laser scanner was used to accurately measure any possible strain on a slope under pertaining stress with the time difference of 7 months. The laser scanner has the ability to measure the 3-D coordinate of a target point by calculating the travel time of laser beam between the laser device and the target point, and has been proved to be effective for analysis of the displacement of slopes or large construction. The scanning data measured with time difference were analyzed to find any strain by approaches of plane angle change, curvature variation, twist of frame, displacement of merging point, etc. From the analysis, some weak points showing heavily distorted shape were detected, which was used to design the reinforcement.

The 3D Modeling Data Production Method Using Drones Photographic Scanning Technology (드론 촬영 기반 사진 스캐닝 기술을 활용한 3D 모델링데이터 생성방법에 관한 연구)

  • Lee, Junsang;Lee, Imgeun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.22 no.6
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    • pp.874-880
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    • 2018
  • 3D modeling is extensively used in the field of architecture, machinery and contents production such as movies. Modeling is a time-consuming task. In order to compensate for these drawbacks, attempts have recently been made to reduce the production period by applying 3D scanning technology. 3D scanning for small objects can be done directly with laser or optics, but large buildings and sculptures require expensive equipment, which makes it difficult to acquire data directly. In this study, 3D modeling data for a large object is acquired using photometry with using drones to acquire the image data. The maintenance method for uniform spacing between the sculpture and the drone, the measurement method for the flight line were presented. In addition, we presented a production environment that can utilize the obtained 3D point cloud data for animation and a rendered animation result to find ways to make it in various environments.

Implications Deduction through Analysis of Reverse Engineering Process and Case Study for Prefabrication and Construction of Freeform Envelop Panels (비정형 건축물의 외장 패널의 선제작과 시공을 위한 역설계 프로세스와 사례 분석을 통한 시사점 도출)

  • Ryu, Han-Guk;Kim, Sung-Jin
    • Journal of the Korea Institute of Building Construction
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    • v.16 no.6
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    • pp.579-585
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    • 2016
  • 3D laser scanning can be used for scanning the freeform surface and building a model from which the measurements could be taken, in order to solve the difficulty with getting access to the exact freeform shape and position data of the complex building envelope. The shape making process using 3D scanning is as follows: point cloud, mesh surface segmentation, NURBS(Non-Uniform Rational B-spline) surface generation, and parametric solid model generation. In this research, we review previous studies, reverse engineering notion, importance of reverse engineering usage for freeform envelope, and previous cases in order to identify the detail reverse engineering process for prefabrication and construction of freeform panels using 3D laser scanning technology. Therefore, the purpose of this research is to present a basic information which should be considered during design and construction phase and improve quality and constructibility of freeform building by analyzing the reverse engineering process and case study for prefabrication and construction of freeform panels using 3D laser scanning. The research results will enable 3D shape engineering and design parameterization using reverse engineering to be used in various construction projects.

Application of Point Cloud Data for Transmission Power Line Monitoring (송전선 모니터링을 위한 포인트클라우드 데이터 활용)

  • Park, Joon-Kyu;Um, Dae-Yong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.11
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    • pp.224-229
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    • 2018
  • Korea is experiencing a rapid increase in electricity consumption due to rapid economic development, and many power transmission towers are installed to provide smooth power supply. The high-voltage transmission line is mainly made of aluminum stranded wire, and the wire is loosely guided so that some deflection is maintained. The degree of deflection has a great influence on the quality of the construction and the life of the cable. As the time passes, the shrinkage and expansion occur repeatedly due to the weight of the cable and the surrounding environment. Therefore, periodic monitoring is essential for the management of the power transmission line. In this study, the power transmission lines were monitored using 3D laser scanning technology. The data of the power transmission line of the study area was acquired and the point cloud type 3D geospatial information of the transmission line was extracted through data processing. The length of the transmission line and deflection amount were calculated using the 3D geospatial information of the transmission line, and the distance from the surrounding obstacles could be calculated effectively. The result of study shows the utilization of 3D laser scanning technology for transmission line management. Future research will contribute to the efficiency of transmission line management if a transmission line monitoring system using 3D laser scanning technology is developed.

Three-dimensional Geometrical Scanning System Using Two Line Lasers (2-라인 레이저를 사용한 3차원 형상 복원기술 개발)

  • Heo, Sang-Hu;Lee, Chung Ghiu
    • Korean Journal of Optics and Photonics
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    • v.27 no.5
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    • pp.165-173
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    • 2016
  • In this paper, we propose a three-dimensional (3D) scanning system based on two line lasers. This system uses two line lasers with different wavelengths as light sources. 532-nm and 630-nm line lasers can compensate for missing scan data generated by geometrical occlusion. It also can classify two laser planes by using the red and green channels. For automatic registration of scanning data, we control a stepping motor and divide the motor's rotational degree of freedom into micro-steps. To this end, we design a control printed circuit board for the laser and stepping motor, and use an image processing board. To compute a 3D point cloud, we obtain 200 and 400 images with laser lines and segment lines on the images at different degrees of rotation. The segmented lines are thinned for one-to-one matching of an image pixel with a 3D point.