Digital holographic inspection for the inner surface of a straight pipe using current-induced multiwavelength from two laser diodes

Masayuki Yokota; Teppei Koyama; Tomoaki Kawakami

doi:10.1117/1.OE.53.10.104103

15 October 2014 Digital holographic inspection for the inner surface of a straight pipe using current-induced multiwavelength from two laser diodes

Masayuki Yokota, Teppei Koyama, Tomoaki Kawakami

Author Affiliations +

Optical Engineering, Vol. 53, Issue 10, 104103 (October 2014). https://doi.org/10.1117/1.OE.53.10.104103

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.

Citation Download Citation

Masayuki Yokota, Teppei Koyama, and Tomoaki Kawakami "Digital holographic inspection for the inner surface of a straight pipe using current-induced multiwavelength from two laser diodes," Optical Engineering 53(10), 104103 (15 October 2014). https://doi.org/10.1117/1.OE.53.10.104103

Published: 15 October 2014

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available