Digital holographic inspection system for the inner surface of a straight pipe |
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| Institution: | 1. Northwestern Polytechnical University, 127 Youyixi road, Shanxi province, Xi''an 710072, China;2. Xidian University, 2 Taibaisouth road, Shanxi province, Xi''an 710071, China;1. University of Chinese Academy of Sciences, Beijing 100049, China;2. School of Computer Science & Technology, Sichuan University, Chengdu 610064, China;3. The Institute of Optics and Electronics, Chinese Academy of Science, Chengdu 610209, China;1. Ultrasound Elasticy Imaging Laboratory (UEIL), Department of Biomedical Engineering, Columbia University, 51 Engineering Terrace 1210 Amsterdam Avenue, New York 10031, USA;2. Biophysics and Biomedical Physics Laboratory (Bimef), Department of Physics, Antwerp University, 171 Groenenborgerlaan; Antwerp, Antwerp 2020, Belgium;3. Laser and Fiber Electronics Group (LFEG), Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, Lower Silesia, Wroclaw 50-372, Poland |
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| Abstract: | A multicolor digital holographic inspection system achieving both automatic scanning sensing head and automatic correction of a distortion in the profile due to positional error of a sensing head has been applied to the inner surface of a straight brass pipe having artificial defects on its wall. To investigate the inner surface of the pipe, the sensing head consisting of a cone-shaped mirror (CSM) glued to an aluminum base in the pipe is illuminated by the collimated RGB laser beams from the outside of the pipe. In the system, by changing the wavelength of the illumination light and scanning the CSM in the pipe, data acquisitions and analysis are performed using a personal computer. It is shown that the pipe inspection, including a classification of defects, can be successfully conducted by comparing the multicolor intensity images and the height profile of inner surface of pipe. |
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