• 제목/요약/키워드: 레이저 스캐닝

검색결과 176건 처리시간 0.027초

압전작동기를 이용한 레이져 스케닝 미러의 위치제어 (Position Control of Laser Scanning Mirror Using Piezoelectric Actuator)

  • 지학래;김재환;최승복
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1995년도 추계학술대회 논문집
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    • pp.442-445
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    • 1995
  • This paper presents the position tracking control of a laser scanning mirror system in which piezoelectic actuator is incorporated. Using the shear mode of the piezoelectric actuator,angular oscillation of a laser scanning mirror is derived. Torsion bar is rhen designed and attached to the piezoelctric actuator in order to magnify the amplitude generated by the actuator. Finite element modeling and analysis are essntial for designing the piezoelectic actuator. The torsional resonance mode of the piezoelectric actuator is found from the model analysis of the actuator and the mechanical shear is matched with the driving frequency. Transfer function between the electrical excitation and the mechanical shear deformation at resonance frequency is found form the response of the actuator calculated by the finite element analysis and the governing equation of the system is derived from d'Alembert's principle. Tracking control performance for desired trajectory which is, in fact, sinusoidal curve is presented in order to demonstrate the validity of the proposed system.

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경로 예측에 기반한 이동로봇을 이용한 가상 현실을 위한 삼차원 실내 환경 모델의 자율 복원에 관한 연구 (Autonomous Reconstruction of 3D Indoor Environment for Virtual Reality using a Mobile Robot based on the Observation Planning)

  • 문정현;유범재;김학배;오상록
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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    • pp.2774-2776
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    • 2005
  • 본 논문에서는 이동로봇에 삼차원 레이저 스캐너를 장착하여 삼차원 데이터의 수집, 수집된 데이터의 정합, 데이터 수집을 위한 이동로봇의 경로계획 및 장애물 회피주행 등 모든 작업들을 유기적으로 결합시켜 실내 환경에 다한 삼차원 모델을 자율제작하는 시스템을 제안한다. 이를 위해 스캔순서최적화를 통한 빠른 동적 물체 정보의 제거, 계층적 육면체 맵과 기하학적맵을 이용한 최적 경로 예측에 의한 다음 스캐닝 위치의 결정, 오도미터 정보와 명암 정보를 이용해 수정된 ICP 알고리즘을 통한 데이터의 정합을 통하여 이동물체와 관계없는 실내환경에 대한 삼차원 모델의 자율복원 한다.

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식생밀도분포 및 등고선의 단계별 필터링에 관한 연구 (A Study for Vegetation Points Density and LiDAR Contour Filtering)

  • 김은영;한성만
    • 한국GIS학회:학술대회논문집
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    • 한국GIS학회 2008년도 공동추계학술대회
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    • pp.21-25
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    • 2008
  • 최근 측량기술이 발전함에 따라 다양한 지형공간정보를 획득할 수 있게 되었다. 특히 레이저스캐닝 기술의 도입은 정밀한 지형과 식생 및 인공지물 등에 대한 정보를 신속하게 획득하여 원하는 최신 정보를 가공할 수 있게 되었다. 본 연구에서는 라이다의 식생 데이터에서 점의 밀도 분포를 통하여 정량적인 식생분포 분석을 실시하였다. 또한, 정밀한 지형 모델에 대하여 생성되는 라이다 등고선의 효율적인 활용을 위하여 단계별로 필터링을 실시하여 정확성은 유지하면서 저용량의 등고선을 생성하고 도로 및 엔지니어링 분야 활용을 높일 수 있도록 하였다. 이러한 지능적이고 과학적인 연구는 국내 라이다데이터의 적극적인 활용성을 높이고 누구나 쉽게 사용할 수 있도록 하는데 목적이 있으며, 건설 분야뿐만 아니라 생태지도 및 주제도, 재해 환경 분야, 홍수지도, 도시모델링 등 다양한 분야의 활용성을 가능하도록 한다.

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3차원 로봇 레이저 스캐닝 시스템의 모델링과 캘리브레이션 (Modeling and Calibration of a 3D Robot Laser Scanning System)

  • 이종광;윤지섭;강이석
    • 제어로봇시스템학회논문지
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    • 제11권1호
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    • pp.34-40
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    • 2005
  • In this paper, we describe the modeling for the 3D robot laser scanning system consisting of a laser stripe projector, camera, and 5-DOF robot and propose its calibration method. Nonlinear radial distortion in the camera model is considered for improving the calibration accuracy. The 3D range data is calculated using the optical triangulation principle which uses the geometrical relationship between the camera and the laser stripe plane. For optimal estimation of the system model parameters, real-coded genetic algorithm is applied in the calibration process. Experimental results show that the constructed system is able to measure the 3D position within about 1mm error. The proposed scheme could be applied to the kinematically dissimilar robot system without losing the generality and has a potential for recognition for the unknown environment.

선형가이드용 블록 연삭 공정 시뮬레이션 및 개선에 대한 연구 (Simulation and Improvement of Grinding Processes for Linear Motion Guide Blocks)

  • 조명동;김현수;홍성욱;박천홍
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 추계학술대회 논문집
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    • pp.1018-1021
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    • 1997
  • This paper presents a result of simulation and improvement of grinding process for linear motion guide blocks. A simulation software, which is based on cylindrical grinding process. is used to predict the grinding wheel wear during the grinding process. To validate the simulation, the simulation result is compared with the experimental one. Simulation study is extended to obtain an optimal grinding condition for minimizing the grinding wheel wear. The optimal condition is validated through an experiment.

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600dpi 마스터 에프세타 렌즈 가공 및 성능에 관한 연구 (A Study on Processing and Performance of a 600dpi Master F-theta Lens)

  • 박용우;문성민;류성기
    • 한국기계가공학회지
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    • 제19권5호
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    • pp.1-7
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    • 2020
  • This study examines the processing and performance of an f-theta lens, one of the main components used in laser printer and laser scanning systems. To design an f-theta lens, the optical path of the components of the laser scanning unit f-theta lens, cylinder lens, and collimator lens must be identified. The goal after machining the master f-theta lens is to understand the optical properties, root mean square, and peak to valley.

3차원 레이저 스캐닝 점 좌표 데이터로부터 CAE 유한 요소 메쉬 생성 알고리즘 개발 (Finite Element Mesh Generation from 3D Laser Scanned Data)

  • 장순석;양해정;이제형
    • 한국CDE학회논문집
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    • 제10권1호
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    • pp.70-75
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    • 2005
  • A 3D solid element mesh generation algorithm was newly developed. 3D surface points of global rectangular coordinates were supplied by a 3D laser scanner. The algorithm is strait forward and simple but it generates mixed solid elements such as hexagonal, pyramid and prism types. Then, the surface triangular or rectangular elements were generated from the solid elements. The key of the algorithm is elimination of elements and 3D adaptive surface smoothing using given 3D surface point data.

스캐닝 레이저 도플러 진동 측정기를 이용한 모드 측정 (Measurement of Mode Shape By Using A Scanning Laser Doppler Vibrometer)

  • 강민식
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 춘계학술대회논문집A
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    • pp.420-425
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    • 2000
  • When spatially dense velocity distribution is measured by a scanning laser Doppler vibrometer, the Fourier transform method provides the real and imaginary parts of the mode shapes in the form of a polynomial. However the Fourier transform method is often impractical because the independent decomposition property of cosine and sine components into real and imaginary parts, respectively, does not hold due to the leakage problem which commonly occurs in the Fourier transform of harmonic signals. To deal with this problem, a Hilbert transform method is newly proposed in this article. The proposed method is free from the leakage problem and relatively robust to tire scanning error. A simulation example is provided to verify the effectiveness of this method.

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연속 스캐닝 레이저 진동계 신호의 Hilbert 변환을 이용한 실험적 모드 해석 (Experimental Modal Analysis by Using Hilbert Transform of Signal from Continuous Scanning Laser Vibrometer)

  • 강민식;장태규;김호성
    • 대한전기학회논문지:시스템및제어부문D
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    • 제51권6호
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    • pp.272-277
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    • 2002
  • This paper deals with the vibration deflection shape measurement technique for a sinusoidally excited structure using a continuously scanning laser Doppler vibrometer (CSLV). The CSLV output signal is an amplitude-modulated vibration in which the excitation signal is modulated by the deflection shapes, and thus the deflection shapes of vibration defined along a scan line can be derived by the envelop and the phase information of the CSLV output signal. In this work, a Hilbert transform based approach has been proposed for measurement of deflection shapes. This technique is as simple as the demodulation technique and allows more convenient experimental settings than the Fourier transform approach. The feasibility of the proposed technique is illustrated along with results of experiment.

3D SCANNING을 활용한 비정형 외장재의 시공 공법 검토 (Construction Methods Review of Freeform Envelope Using 3D Scanning)

  • 김성진;박성진;최영재;류한국
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2014년도 추계 학술논문 발표대회
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    • pp.100-101
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    • 2014
  • The generation of 3D models for freeform buildings is an important task while continuous monitoring of the related spatial information at different time phases. Realistic models of freeform building have to provide high geometric accuracy and detail at an effective data size.(Al-kheder, S. 2008) The efficiency of this image-based technique has been increased considerably by the development of digital technologies. Furthermore, 3D data collection based on laser scanning has become an high quality 3D models for construction site. Therefore, in this research, we have an effort to review construction methods to make freeform envelope of building using 3D scanning technology.

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