Instrumentation, Measurement, and Metrology

Conoscopic holography-based long-standoff profilometer for surface inspection in adverse environment

[+] Author Affiliations
José Maria Enguita

University of Oviedo, Department of Ingeniería Eléctrica, Campus de Viesques s/n Ed. 2, 2.1.14, 33204 Gijón, Spain

Ignacio Álvarez

University of Oviedo, Department of Ingeniería Eléctrica, Campus de Viesques s/n Ed. 2, 2.1.14, 33204 Gijón, Spain

César Fraga

University of Oviedo, Department of Ingeniería Eléctrica, Campus de Viesques s/n Ed. 2, 2.1.14, 33204 Gijón, Spain

Jorge Marina

University of Oviedo, Department of Ingeniería Eléctrica, Campus de Viesques s/n Ed. 2, 2.1.14, 33204 Gijón, Spain

Yolanda Fenández

University of Oviedo, Department of Ingeniería Eléctrica, Campus de Viesques s/n Ed. 2, 2.1.14, 33204 Gijón, Spain

Gabriel Sirat

Optimet–Optical Metrology Limited, 6 Hartom Street, P.O. Box 45021, Jerusalem 91450, Israel

Opt. Eng. 45(7), 073602 (July 05, 2006). doi:10.1117/1.2219097
History: Received July 19, 2005; Revised November 22, 2005; Accepted December 02, 2005; Published July 05, 2006
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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 1200mm), and still keeps good resolution (under 0.2mm) 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 1200mm. 100% of the production can be inspected without interfering with the process and without adding any delay.

Figures in this Article
© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

José Maria Enguita ; Ignacio Álvarez ; César Fraga ; Jorge Marina ; Yolanda Fenández, et al.
"Conoscopic holography-based long-standoff profilometer for surface inspection in adverse environment", Opt. Eng. 45(7), 073602 (July 05, 2006). ; http://dx.doi.org/10.1117/1.2219097


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