• Title/Summary/Keyword: Inspection Technique

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The Development of Surface Inspection System Using the Real-time Image Processing (실시간 영상처리를 이용한 표면흠검사기 개발)

  • 이종학;박창현;정진양
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.171-171
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    • 2000
  • We have developed m innovative surface inspection system for automated quality control for steel products in POSCO. We had ever installed the various kinds of surface inspection systems, such as a linear CCD and a laser typed surface inspection systems at cold rolled strips production lines. But, these systems cannot fulfill the sufficient detection and classification rate, and real time processing performance. In order to increase detection and classification rate, we have used the Dark, Bright and Transition Field illumination and area type CCD camera, and fur the real time image processing, parallel computing has been used. In this paper, we introduced the automatic surface inspection system and real time image processing technique using the Object Detection, Defect Detection, Classification algorithms and its performance obtained at the production line.

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Quantitative Evaluation of Impact Defects inside of Composite Material Plate by ESPI (ESPI를 이용한 충격손상을 받은 복합재료 내부결함의 정량평가)

  • 김경석;양광영;장호섭;지창준;윤홍석
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.10a
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    • pp.254-258
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    • 2003
  • Electronic Speckle Pattern for quantitative evaluation of a impact defect inside of composite material plate are described. The impact on composite material makes inside delamination which is difficult to detect visual inspection and ultrasonic testing due to non-homeogenous structure. This paper proposes the quantitative evaluation technique of defects under real impact. Artificial defects are designed inside of composite plate for development of inspection technique and real defects under impact are inspected and compared with results of visual inspection.

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Matching Pursuit Approach for Guided Wave-based Damage Inspection (유도 초음파 이용 결함 진단을 위한 정합추적 기법)

  • Hong, Jin-Chul;Sun, Kyung-Ho;Kim, Yoon-Young
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.4 s.97
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    • pp.382-387
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    • 2005
  • For successful guided-wave damage inspection, the appropriate signal processing of measured wave signals is very important. The objective of this paper is to introduce an efficient signal processing technique especially suitable for the guided-waves used for damage detection. The key idea of this technique is to model guided-waves by chirp functions of special form considering the dispersion phenomenon. To determine the parameter of the chirp functions simulating guided-waves, the matching pursuit algorithm is employed. The damage information in waveguides can be extracted by pulse-characterizing parameters. The effectiveness of present method is checked with the guided wave-based damage inspection.

Guided-Waves-Based Mortar-Filled Steel Pipe Inspection Using EMAT End Wavelet Transform

  • Na Won-Bae;Kim Jeong-Tae;Ryu Yeon-Sun
    • Journal of Ocean Engineering and Technology
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    • v.20 no.2 s.69
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    • pp.8-15
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    • 2006
  • Guided-waves-based mortar-filled steel pipe inspection is carried out through using EMAT (Electro magnetic acoustic transducer) and wavelet transform. Possibly existing anomalies such as separation (or void) and inclusion are made in the fabricated mortar-fled steel pipes: these anomalies are infected. Since guided waves have the long range inspection capability, EMAT has its own advantages over the conventional PZT (Piezoelectric zirconate titanate), and wavelet transform gives the multi-resolution on time-frequency domain results, the suggested technique gives an alternative way for inspecting mortar-filled steel pipes, which are popularly used for supporting marine structures such as piers, wharfs, moles, and dolphins. Through this study, it is show that the suggested technique is promising for detecting the amounts of separations and inclusions.

Development of Non-Contacting Automatic Inspection Technology of Precise Parts (정밀부품의 비접촉 자동검사기술 개발)

  • Lee, Woo-Sung;Han, Sung-Hyun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.6
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    • pp.110-116
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    • 2007
  • This paper presents a new technique to implement the real-time recognition for shapes and model number of parts based on an active vision approach. The main focus of this paper is to apply a technique of 3D object recognition for non-contacting inspection of the shape and the external form state of precision parts based on the pattern recognition. In the field of computer vision, there have been many kinds of object recognition approaches. And most of these approaches focus on a method of recognition using a given input image (passive vision). It is, however, hard to recognize an object from model objects that have similar aspects each other. Recently, it has been perceived that an active vision is one of hopeful approaches to realize a robust object recognition system. The performance is illustrated by experiment for several parts and models.

Matching Pursuit Approach for Guided Wave-Based Damage Inspection (유도 초음파 이용 결함 진단을 위한 정합추적 기법)

  • Hong, Jin-Chul;Sun, Kyung-Ho;Kim, Yoon-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.615-618
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    • 2004
  • For successful guided-wave damage inspection, the appropriate signal processing of measured wave signals is very important. The objective of this paper is to introduce an efficient signal processing technique especially suitable for the guided-waves used for damage detection. The key idea of this technique is to model guided-waves by chirp functions of special form considering the dispersion phenomenon. To determine the parameter of the chirp functions simulating guided-waves, the matching pursuit algorithm is employed. The damage information in waveguides can be extracted by pulse-characterizing parameters. The effectiveness of present method is checked with the longitudinal wave-based damage inspection.

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Core-Tcchnology for MFL Inspection System (누설자속 측정 시스템 개발을 위한 요소기술)

  • Won, Sun-Ho;Jo, Gyeong-Sik
    • 연구논문집
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    • s.30
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    • pp.159-168
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    • 2000
  • In this research, MFL inspection system has been studied for the inspection of storage tank floor. The reference specimens having 20%, 40%, 60% and 80% slot's are fabricated using the carbon steel plates of a 6mm and 10mm thick. Powerful permanent magnets and Hall effect sensors are used to this application. Also, this paper presents a newly developed MFL scanning system. Conclusively, it is shown that our system is able to detect metal loss like a slot.

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