• Title/Summary/Keyword: Non-contact Inspection System

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An Algorithm for the Characterization of Surface Crack by Use of Dipole Model and Magneto-Optical Non-Destructive Inspection System

  • Lee, Jin-Yi;Lyu, Sung-Ki;Nam, Young-Hyun
    • Journal of Mechanical Science and Technology
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    • v.14 no.10
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    • pp.1072-1080
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    • 2000
  • Leakage magnetic flux (LMF) is widely used for non-contact detection of cracks. The combination of optics and LMF offers advantages such as real time inspection, elimination of electrical noise, high spatial resolution, etc. This paper describes a new nondestructive evaluation method based on an original magneto-optical inspection system, which uses a magneto-optical sensor, LMF, and an improved magnetization method. The improved magnetization method has the following characteristics: high observation sensitivity, independence of the crack orientation, and precise transcription of the geometry of a complex crack. The use of vertical magnetization enables the visualization of the length and width of a crack. The inspection system provides the images of the crack, and shows a possibility for the computation of its depth.

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A New Robotic 3D Inspection System of Automotive Screw Hole

  • Baeg, Moon-Hong;Baeg, Seung-Ho;Moon, Chan-Woo;Jeong, Gu-Min;Ahn, Hyun-Sik;Kim, Do-Hyun
    • International Journal of Control, Automation, and Systems
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    • v.6 no.5
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    • pp.740-745
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    • 2008
  • This paper presents a new non-contact 3D robotic inspection system to measure the precise positions of screw and punch holes on a car body frame. The newly developed sensor consists of a CCD camera, two laser line generators and LED light. This lightweight sensor can be mounted on an industrial robot hand. An inspection algorithm and system that work with this sensor is presented. In performance evaluation tests, the measurement accuracy of this inspection system was about 200 ${\mu}m$, which is a sufficient accuracy in the automotive industry.

3-Dimensional Shape Measurement System for BGA Balls Using PMP Method (PMP 방식을 이용한 BGA 볼의 3차원 형상측정 시스템)

  • Kim, Hyo Jun;Kim, Joon Seek;Joo, Hyonam
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.1
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    • pp.59-65
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    • 2016
  • As modern electronic devices get smaller and smaller, high-resolution, large Field-Of-View (FOV), fast, and cost-effective 3-dimensional (3-D) measurement is requested more and more. In particular, defect inspection machines using machine-vision technology nowadays require 3-D inspection as well as the conventional 2-D inspection. Phase Measuring Profilometry (PMP) is one of the fast non-contact 3-D shape measuring methods currently being extensively investigated in the electronic component manufacturing industry. The PMP system is well known and is successfully applied to measuring complex surface profiles with varying reflectance properties. However, for highly reflective surfaces, such as Ball Grid Arrays (BGAs), it has difficulty accurately measuring 3-D shapes. In this paper, we propose a new fast optical system that can eliminate the highly reflective saturated regions in BGA ball images. This is achieved by utilizing four Low Intensity Grating (LIG) images together with the conventional High Intensity Grating (HIG) images. Extensive experiments using BGA samples show a repeatability of under ${\pm}20um$ in standard deviation, which is suitable for most 3-D shape measurements of BGAs.

The Inspection of Press Forming Product Through Application of Reverse Engineering System (역설계 시스템 적용을 통한 프레스 성형물 검사)

  • Kim, Min-Joo;Kim, Soo-Yong;Lee, Seung-Soo;Chan, Jeon-Eon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.9
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    • pp.1276-1283
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    • 2004
  • This study is an inspection of press forming product and mould using reverse engineering system. The inspection process on production field involves a lot of errors because of the hand-work so we focussed on improving the measured precision through performing the effective inspection using 3D non-contact scanner. By so doing that, we improved the precision of press forming product by analyzing the cause following the inspection result. Through the inspection, we applied it to the reverse engineering and we could improve the inspection process.

The Inspection of Press Forming Product of backward lamp parts at automobile through Application of Reverse Engineering System (역설계 시스템 적용을 통한 자동차 후방 램프부의 프레스 성형물 검사)

  • Kim S.Y.;Kim T.H.;Kim M.J.;Lee S.S.;Jeon E.C.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.419-422
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    • 2005
  • This study is an inspection of press forming product and mould using reverse engineering system. The inspection process on production field involves a lot of errors because of the hand-work so we focussed on improving the measured precision through performing the effective inspection using 3D non-contact scanner. By so doing that, we improved the precision of press forming product by analyzing the cause fellowing the inspection result. Through the inspection, we applied it to the reverse engineering and we could improve the inspection process.

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The Inspection of Press Forming Product of forward conner parts at automobile through Application of Reverse Engineering System (역설계 시스템 적용을 통한 자동차 전방 모서리부의 프레스 성형물 검사)

  • Han M.S.;Park J.D.;Kim M.J.;Lee S.S.;Jeon E.C.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.962-965
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    • 2005
  • This study is an inspection of press forming product and mould using reverse engineering system. The inspection process on production field involves a lot of errors because of the hand-work so we focussed on improving the measured precision through performing the effective inspection using 3D non-contact scanner. By so doing that, we improved the precision of press forming product by analyzing the cause following the inspection result. Through the inspection, we applied it to the reverse engineering and we could improve the inspection process.

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A Defect Inspection Algorithm Using Multi-Resolution Analysis based on Wavelet Transform (웨이블릿 다해상도 분석에 의한 디지털 이미지 결점 검출 알고리즘)

  • Kim, Kyung-Joon;Lee, Chang-Hwan;Kim, Joo-Yong
    • Textile Coloration and Finishing
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    • v.21 no.1
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    • pp.53-58
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    • 2009
  • A real-time inspection system has been developed by combining CCD based image processing algorithm and a standard lighting equipment. The system was tested for defective fabrics showing nozzle contact scratch marks, which were one of the frequently occurring defects. Multi-resolution analysis(MRA) algorithm were used and evaluated according to both their processing time and detection rate. Standard value for defective inspection was the mean of the non-defect image feature. Similarity was decided via comparing standard value with sample image feature value. Totally, we achieved defective inspection accuracy above 95%.

Color Inspection System for Plasma Display Panel by Using Area Camera (영역 카메라를 이용한 플라즈마 디스플레이의 컬러출력 검사 시스템)

  • 김우섭;도현철;진성일
    • Proceedings of the IEEK Conference
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    • 2003.07e
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    • pp.1763-1766
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    • 2003
  • This paper proposes a non-contact color inspection system for plasma display panel (PDP). The red, green, and blue test pattern images are acquired by using the area color CCD camera at the various distance from the PDP. The RGB values are obtained from the region of interest (ROI) which are extracted by applying the image processing to the test pattern image. Finally, the CIE xy and u'v' chromaticity coordinates of the test pattern images according to the distance are acquired from the RGB color coordinates.

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A Study on Applicability of RFID System for C-Hook Identification (C-Hook 인식을 위한 RFID 시스템의 적용 가능성에 대한 연구)

  • Lee, Chang-Woo;Cho, Hyeon-Woo;Ban, Sung-Jun;Kwon, Yong-Sin;Kim, Sang-Woo
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.1
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    • pp.81-87
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    • 2008
  • C-Hook is a kind of conveyer system for transporting steel coil in POSCO. To detect the current position and the trajectory of steel coils in a plant, C-Hooks are tracked by an inspection system based on PLC. The inspection system detects transit of C-Hooks by monitoring a physical contact between steel bars on a C-Hook and the inspection sensors. However, this system is not reliable because of the abrasion, damage and aging. Moreover, the number of distinguishable C-Hooks is limited by the number of combination of steel bars on a C-Hook. It means that more steel bars should be installed for distinguishing the more C-Hooks. Therefore, the conventional system is difficult and expensive to maintain. To overcome these problems, we propose a C-Hook identification system that uses RFID which is a non-contact type identification system, and evaluate its performance and applicability from a new monitoring program that operates along with the conventional system in the real environment of POSCO.

Calibration off multiple-sensor measuring system for efficient visual inspection (형상 검사를 위한 multiple-sensor 측정 시스템의 캘리브레이션 연구)

  • 김승만;손석배;이관행
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.579-582
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    • 2002
  • In acquiring the surface information of a part, two types of measuring machines have been used: contact type and non-contact type. Since each measuring device has the pres and cons, an integrated measuring system is proposed to acquire the optimal point data. In order to implement the integrated measuring system, the relationship of coordinate systems between each measuring device should be established. In this paper, a new datum fixture and a calibration method for the multiple-sensor measuring system are proposed. The datum fixture is designed to interface two machines, a CMM and a laser scanner. The position of the datum fixture is calibrated by the axis information off motorized rotation stage which is used for a part setup.

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