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Optical Engineering

Digital holographic inspection for the inner surface of a straight pipe using current-induced multiwavelength from two laser diodes
Author(s): Masayuki Yokota; Teppei Koyama; Tomoaki Kawakami
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Paper Abstract

Digital holographic profilometry using multiwavelength from two laser diodes is applied to the measurement of the inner surface of a straight copper pipe and the detection of artificial defects such as holes, rust, and scratches made on the inner wall. To obtain the inner surface profile, a cone-shaped mirror (CSM) attached to a metal 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 inspection of the pipe has been performed by shifting the CSM stepwise along the pipe axis. The new algorithm in which a positional misalignment of the CSM can be directly obtained from the experimental height profile can reduce the load for calculation of correcting the distorted experimental height profile. The pipe inspection has been done using the developed images of both the intensity and height profile for the inner wall of the pipe.

Paper Details

Date Published: 15 October 2014
PDF: 7 pages
Opt. Eng. 53(10) 104103 doi: 10.1117/1.OE.53.10.104103
Published in: Optical Engineering Volume 53, Issue 10
Show Author Affiliations
Masayuki Yokota, Shimane Univ. (Japan)
Teppei Koyama, Shimane Univ. (Japan)
Tomoaki Kawakami, Shimane Univ. (Japan)


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