Detection and measurement of surface defects by automatic fringe analysis |
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| Institution: | 1. Key Laboratory of Metallurgical Equipment and Control Technology, Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;3. Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;4. Institute of Robotics and Intelligent Systems, School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;5. The Chinese University of Hong Kong, Hong Kong, China |
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| Abstract: | A novel measurement and inspection system for the detection and measurement of surface defects, such as chips and cracks, has been developed and applied to engineering components such as cylindrical rollers.The position, depth and volume of such a defect can be determined automatically. Measurement of such defects requires that three-dimensional information be made available for computer analysis. This is achieved by using a grating projection technique to provide contour fringes on the object, i.e. to give depth information. The contoured object is viewed by a charge coupled device (CCD) camera, the output of which is digitised and stored in a frame buffer from which it is available to a computer system for digital image processing, analysis and comparison. Calibration tests on defects of known size have confirmed that the system is fast and accurate. |
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