Share Email Print

Optical Engineering

Conoscopic holography-based long-standoff profilometer for surface inspection in adverse environment
Author(s): Jose María Enguita; Ignacio Alvarez; Cesar Fraga Bobis; Jorge Marina; Yolanda Fernández; Gabriel Y. Sirat
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

One of the more challenging applications of optical metrology is real-time dimensional control and surface inspection in industrial applications, where strong requirements of cost, setup, and applicability in adverse environments greatly limit the number of applicable technologies. This work shows an optic profilometer developed specifically for this purpose, the algorithms developed for efficient and accurate distance map calculation, and an example of its use in a harsh steelmaking environment. This device, based on conoscopic holography, is able to obtain a distance profile of a target in a single shot, works at long distance standoff (700 to 1200 mm), and still keeps good resolution (under 0.2 mm) with a very easy and reliable setup. The second part of the work focuses on a real example of this technology applied in an on-line inspection system in steel continuous casting funded by the European Coal and Steel Community, and which is currently working in the Aceralia LDA steelmaking factory in Asturias (Spain). The system is placed in the process line and performs on-line detection of surface defects over hot steel slabs (above 800°C in the inspection point) from a distance of 1200 mm. 100% of the production can be inspected without interfering with the process and without adding any delay.

Paper Details

Date Published: 1 July 2006
PDF: 10 pages
Opt. Eng. 45(7) 073602 doi: 10.1117/1.2219097
Published in: Optical Engineering Volume 45, Issue 7
Show Author Affiliations
Jose María Enguita, Univ. de Oviedo (Spain)
Ignacio Alvarez, Univ. de Oviedo (Spain)
Cesar Fraga Bobis, Univ. de Oviedo (Spain)
Jorge Marina, Univ. de Oviedo (Spain)
Yolanda Fernández, Univ. de Oviedo (Spain)
Gabriel Y. Sirat, Univ. of California/Los Angeles (United States)

© SPIE. Terms of Use
Back to Top