• Title, Summary, Keyword: 광삼각법

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Design of a non-contact type displacement measurement system based on optical triangulation method (광삼각법에 의한 비접촉식 변위측정계의 설계)

  • 이재윤;김승우
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.6
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    • pp.1030-1035
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    • 1992
  • This paper presents a non-contact type displacement sensor designed based on optical triangulation method. The optical principles of the sensor are described in detail with aids of paraxial geometric optics. A prototype sensor is designed and fabricated by using modern optoelectronic hardware. Its measuring performances are evaluated and discussed through a series of calibration processes.

Modeling and Analysis of Diffuse-type Optical Triangulation Displacement Sensor (난반사형 광삼각법 변위 센서의 모델링 및 거동 해석)

  • 오세백;김경찬;김수현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.43-46
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    • 2000
  • Optical triangulation displacement sensors(0TDSs) are widely used for their simple struchlre, high resolution, and long operating range. However, there are several factors that must be taken into account in order to obtain high accuracy and reliability Measurement errors from inclinations a? an object surface, prohe signal fluctuations generated by speckle effects. power vanation of a light source, electronic noises, and so on. Previous models of OTDSs can not show reasonable behavior as change of surface inclination and shape of light intensity distribution on the detector. In this paper, we propose a new and reasonable modeling for diffise-type OTDSs based on a geometrical optics. To verify propriety of new modeling, we take basic experiments. Shape of light intensity distribution is asymmetric in both simulation result and experimental result. Both simulation result and experimental result show same tendency of light intensity distribution movement as changing surface inclination

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Coordinate Measuring Technique based on Optical Triangulation using the Two Images (두장의 사진을 이용한 광삼각법 삼차원측정)

  • 양주웅;이호재
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.76-80
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    • 2000
  • This paper describes a coordinate measuring technique based on optical triangulation using the two images. To overcome the defect of structured light system which measures coordinate point by point, light source is replaced by CCD camera. Pixels in CCD camera were considered as virtual light source. The overall geometry including two camera images is modeled. Using this geometry, the formula for calculating 3D coordinate of specified point is derived. In a word, the ray from a virtual light source was reflected on measuring point and the corresponding image point was made on the other image. Through the simulation result, validation of formula is verified. This method enables to acquire multiple points detection by photographing.

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3-Dimensional Profile Measurement of Free-Formed Surfaces by Slit Beam Scanning Topography (슬릿광 주사방법에 의한 자유곡면의 삼차원형상 측정)

  • 박현구;김승우;박준호
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.5
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    • pp.1202-1207
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    • 1993
  • An optical method of slit beam scanning topography is presented for the 3-dimensional profile measurement of free-formed surfaces. A slit beam of laser is projected in a scanning mode and its illuminated trajectory on the object is captured by using a CCD camera. The 3-dimensional coordinates of the trajectory is then computed by using the given geometry between the slit beam and the camera, so that the whole surface profile of the object can be obtained in a successive manner. Detailed optical principles are described with special emphasis to lateral are discussed to demonstrate the measuring performances of the slit beam scanning topography proposed in this study.

A Study on Adaptable Non-contact Shape Inspection System (적응형 비접촉 형상 검사에 관한 연구)

  • Kang, Young-June;Park, Nak-Gyu;Lee, Dong-Hwan
    • Journal of the Korean Society for Nondestructive Testing
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    • v.25 no.2
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    • pp.74-80
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    • 2005
  • A new dimension measuring method for the measurement of diameter of an object has been developed using laser triangulation. The 3D data of an object was calculated from the 2 dimensional image information obtained by the laser stripe using the laser triangulation. The system that use existing theory can measure the diameter of hole not only in a normal plane but also ill an incline plane. However, in the existing theory, since the lens with fixed feral length was used, the area of measurement was fixed. The simplest way to solve this problem is to change distance between a CCD camera and object. Other way is to use a zoom lens having variable focal length. In this paper, the zoom lens with variable focal length was used. Therefore, we ran experiment with magnification that is optimized according to size of object using zoom lens with variable focal length.

Characteristics of the Laser Displacement Sensor Using Optical Triangulation Method (광삼각법을 이용한 레이저 변위 센서의 특성 연구)

  • Park, Jong-Sung;Jeong, Kyu-Won
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.7
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    • pp.40-50
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    • 1999
  • Recently, a laser displacement sensor is widely used for the manufacturing automation. The sensor is generally composed of a diode laser and a light receiving device. The diode laser emits a laser beam and the receiving device detects the light reflected from the measured object. The object position is obtained based upon triangulation method. As a light receiving device, a PSD is usually utilized since its structure is very simple and rugged and has a high accuracy. Although the theoretical relationship for this sensor had been developed, the characteristics of the sensor have not been much experimentally studied. In this paper, several experimental results will presented. The measurement accuracy is affected by the surface conditions such as the reflectance characteristics, the angle of the object's surface and the laser intensity. In addition, it is found that the PSD and the signal processing circuit have nonlinearities and showed that those nonlinearities can be reduced by controlling the emitting laser intensity.

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System Design and Camera Calibration of Slit Beam Projection for Maximum Measuring Accuracy (슬릿광 3차원 형상측정에서 측정분해능 최적화를 위한 시스템설계 및 카메라보정)

  • 박현구;김명철;김승우
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.5
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    • pp.1182-1191
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    • 1994
  • This paper presents an enhanced method of slit beam projection intended for the rapid measurement of 3-dimensional surface profiles of dies and molds. Special emphasis is given to optimizing the design of optical system so that the measuring accuracy can be maximized by adopting two-plane camera calibration together with sub-pixel image processing techniques. Finally, several measurement examples are discussed to demonstrate that an actual measuring accuracy of $\pm$ 0.2 mm can be achieved over the measuring range of 500 mm{\times}300mm{\times}200mm$.