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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 21 — Jul. 20, 2011
  • pp: 3937–3946

Digital holographic profilometry of the inner surface of a pipe using a current-induced wavelength change of a laser diode

Masayuki Yokota and Toru Adachi  »View Author Affiliations

Applied Optics, Vol. 50, Issue 21, pp. 3937-3946 (2011)

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Phase-shifting digital holography is applied to the measurement of the surface profile of the inner surface of a pipe for the detection of a hole in its wall. For surface contouring of the inner wall, a two-wavelength method involving an injection-current-induced wavelength change of a laser diode is used. To illuminate and obtain information on the inner surface, a cone-shaped mirror is set inside the pipe and moved along in a longitudinal direction. The distribution of a calculated optical path length in an experimental alignment is used to compensate for the distortion due to the misalignment of the mirror in the pipe. Using the proposed method, two pieces of metal sheet pasted on the inner wall of the pipe and a hole in the wall are detected. This shows that the three-dimensional profile of a metal plate on the inner wall of a pipe can be measured using simple image processing.

© 2011 Optical Society of America

OCIS Codes
(090.2880) Holography : Holographic interferometry
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure

ToC Category:

Original Manuscript: February 14, 2011
Revised Manuscript: May 28, 2011
Manuscript Accepted: May 30, 2011
Published: July 13, 2011

Masayuki Yokota and Toru Adachi, "Digital holographic profilometry of the inner surface of a pipe using a current-induced wavelength change of a laser diode," Appl. Opt. 50, 3937-3946 (2011)

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