• Title/Summary/Keyword: Surface profile measurement

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Development of straightness measurement system for flat workpiece (평면 공작물의 진직도 측정 시스템 개발)

  • 김현수;조명동;장문주;홍성욱;박천홍
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.203-206
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    • 2001
  • This paper presents a straightness measurement system for flat and long workpieces. The measurement system consists of a laser optical unit, a CCD camera and processing system, and a carrier system with a stylus. The carrier system accompanies the stylus, which displaces a retroreflector along the surface profile. The optical unit is used to optically amplify the displacement of retroreflector. The CCD camera and processing system finally identifies the vertical displacement of the stylus unit. The developed system is applied to two surfaces: ground surface and LM guide surface. The experimental results show that the developed system can measure the straightness of flat surfaces within sub-micron error.

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Development of Straightness Measurement System thor Flat Workpieces (평면 공작물 진직도 측정 시스템 개발에 관한 연구)

  • Kim, Hyeon-Su;Jang, Mun-Ju;Hong, Seong-Uk;Park, Cheon-Hong
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.3
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    • pp.107-113
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    • 2002
  • This paper presents a straightness measurement system for flat and long workpieces. The measurement system consists of a laser, a CCD camera and processing system, a carrier system with a stylus, and some optical units. The carrier system accompanies the stylus, which displaces and retroreflector along the surface profile. The optical unit is used to optically amplify displacement of the stylus unit. The developed system is applied to a ground surface and a LM guide unit. The experimental results show that the developed system can measure the straightness of flat surface and moving systems.

Hardness Analysis of Surface Treated Magnesium Alloy using Laser Induced Breakdown Spectroscopy (레이저 플라즈마 분광분석법을 이용한 표면처리 된 마그네슘 합금 표면의 경도 분석)

  • Kang, Dongchan;Kim, Joohan
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.6
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    • pp.625-631
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    • 2015
  • The hardness of surface treated magnesium alloy was evaluated using laser induced breakdown spectroscopy. The surface of the specimen was hardened mechanically, and the hardness profiles were measured using a traditional measurement technique. A laser beam was irradiated to generate a plasma, and the peaks of the components of the specimen were analyzed. A wavelength of 333.66 nm and 293.65 nm were selected as the atomic and ionic peaks, respectively. The ratios of the ionic peak to the atomic peak were obtained so as to compare the hardness profile. As the depth increased, the ratio decreased. These results are in good agreement with the previous hardness measurement results. It can be considered that this technique could be applied for remote and time-efficient hardness measurement.

Implementation of 3D Road Surface Monitoring System for Vehicle based on Line Laser (선레이저 기반 이동체용 3차원 노면 모니터링 시스템 구현)

  • Choi, Seungho;Kim, Seoyeon;Kim, Taesik;Min, Hong;Jung, Young-Hoon;Jung, Jinman
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.20 no.6
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    • pp.101-107
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    • 2020
  • Road surface measurement is an essential process for quantifying the degree and displacement of roughness in road surface management. For safer road surface management and quick maintenance, it is important to accurately measure the road surface while mounted on a vehicle. In this paper, we propose a sophisticated road surface measurement system that can be measured on a moving vehicle. The proposed road surface measurement system supports more accurate measurement of the road surface by using a high-performance line laser sensor. It is also possible to measure the transverse and longitudinal profile by matching the position information acquired from the RTK, and the velocity adaptive update algorithm allows a manager to monitor in a real-time manner. In order to evaluate the proposed system, the Gocator laser sensor, MRP module, and NVIDIA Xavier processor were mounted on a test mobile and tested on the road surface. Our evaluation results demonstrate that our system measures accurate profile base on the MSE. Our proposed system can be used not only for evaluating the condition of roads but also for evaluating the impact of adjacent excavation.

Analysis of Measuring Error of Surface Roughness by Contact Stylus Profilometer (촉침에 의한 표면 거칠기 측정 오차 해석)

  • Cho, Nahm-Gyoo;Kwon, Ki-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.12
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    • pp.174-181
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    • 1999
  • This paper describes the effect of the stylus tip size on the shape error in surface topography measurement. To analyze the distortional effect of an actual surface geometry origination from the finite stylus size, the surface is modeled as a sinusoid and the stylus tip as a circle. The magnitude of this distortion is defined as the ration of standard deviation, and this is expressed as an analytic function of the stylus tip radius and the geometrical parameter of a sinusoid. In this paper, the spectrum analysis of the profile is applied to investigate the distortional effect due to the mechanical filtering of the stylus in the frequency domain. and, the cumulative power spectrum is proposed to assess the shape error of measured data according to the various stylus tip sizes. From these results, a new method to select proper stylus tip radius is proposed.

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Profile Mcasyrenebt if Shadow Masks (Shadow Mask 곡률 치수 측정 시스템)

  • 김기홍;김남현;박현구;김승우;김동형
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.10a
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    • pp.261-266
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    • 1993
  • This paper describes a 3-dimensional profile measurement method which was intended especially for sheet metal products such as shadow masks. The method is based upon machine vision in which the height variation of the surface is measured by software auto-forus image processing techniques. The method is found suitable for flexible surfaces with interrupt.

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Development of an AFM-Based System for Nano In-Process Measurement of Defects on Machined Surfaces (가공면미세결함의 나노 인프로세스 측정을 위한 AFM시스템의 개발)

  • Gwon, Hyeon-Gyu;Choe, Seong-Dae;Park, Mu-Hun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.3
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    • pp.537-543
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    • 2002
  • This paper examines a new in-process measurement system for the measurement of micro-defects on the surfaces of brittle materials by using the AFM (Atomic Force Microscopy). A new AFM scanning stage that can also perform nano-scale bending of the sample was developed by adding a bending unit to a commercially available AFM scanner. The bending unit consists of a PZT actuator and sample holder, and can perform static and cyclic three-point bending. The true bending displacement of the bending unit is approximately 1.8mm when 80 volts are applied to the PZT actuator. The frequency response of the bending unit and the stress on the sample were also analyzed, both theoretically and experimentally. Potential surface defects of the sample were successfully detected by this measurement system. It was confirmed that the number of micro-defects on a scratched surface increases when the surface is subjected to a cyclic bending load.

Refractive media flatness measurement by phase shifting digital holography (위상천이 디지털 홀로그래피를 이용한 평판의 표면 평면도 측정)

  • Jeon, Sung-Bin;Kim, Do-Hyung;Cho, Jang-Hyun;Park, No-Cheol;Yang, Hyun-Seok;Park, Kyoung-Su;Park, Young-Pil
    • Transactions of the Society of Information Storage Systems
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    • v.8 no.2
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    • pp.44-49
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    • 2012
  • We measured the surface flatness of both sides for refractive media using the transmitted digital holography method. To enhance the accuracy of the result, phase-shifting system was used. With two different phase modulation of reference beam, the phase profile of object can be easily obtained. Thus, we proposed the surface measurement method which can measure large area fast, compared with conventional methods. To guarantee the reliability of obtained result, we compared with Zygo measurement system. With the proposed method, the surface flatness of $3.45{\mu}m$ resolution could be obtained.

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$.

A study on flow characteristics in a partially filled open channel (비만관 개수로 유동 특성 연구)

  • Choi, Jung-Geun;Sung, Jae-Yong;Lee, Myeong-Ho;Lee, Suk-Jong
    • 한국가시화정보학회:학술대회논문집
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    • 2006.12a
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    • pp.73-77
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    • 2006
  • Flow rate measurement is one of the difficult problems in the industrial applications. Especially, flow rate in a partially filled pipeline is affected by many parameters such as water level, channel slop, etc. In the present study, prior to the development of a flowmeter, the flow characteristics has been investigated by particle image velocimetry (PIV) measurements. Three-dimensional velocity distributions were obtained from sectional measurements of velocity profiles according to the water level. As a result, it is found that there is no similarity in the velocity profile when the lateral position is changed. In addition, the maximum velocity does not always occur on the free surface. It depends on the water level. In the aspect of flow rate measurement, the previous calculus based upon point measurement techniques is proved to be inaccurate because of the lack of whole flow information.

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