13 May 2013 Digital holographic inspection for the straight pipe inner surface using multiwavelength from laser diodes
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Abstract
Digital holographic profilometry using multiwavelength from laser diodes is applied to an inspection of inner surface of straight copper pipe and the detection of artificial defects such as a hole, rust and a scratch in its wall. To obtain the inner surface profile, a cone-shaped mirror attached to a rod having two acrylic spacers is inserted into the pipe and illuminated by the collimated laser beam from the other open end of the pipe. The measurement has been performed by shifting the mirror stepwise along the pipe. Distribution of an optical path length in the alignment is calculated and used to compensate for a distortion in the profile due to a positional misalignment of the mirror. The new algorithm to obtain the positional error is adopted for the compensation process and the shape and positions of defects in the inner wall can be investigated.
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M. Yokota, M. Yokota, T. Koyama, T. Koyama, T. Kawakami, T. Kawakami, "Digital holographic inspection for the straight pipe inner surface using multiwavelength from laser diodes", Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 87880J (13 May 2013); doi: 10.1117/12.2020371; https://doi.org/10.1117/12.2020371
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