Author： Álvarez Ignacio Enguita Jose M. Frade María Marina Jorge Ojea Guillermo
Publisher： MDPI
E-ISSN： 1424-8220|9|9|7021-7037
ISSN： 1424-8220
Source： Sensors, Vol.9, Iss.9, 2009-09, pp. : 7021-7037
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
On-line non-contact surface inspection with high precision is still an open problem. Laser triangulation techniques are the most common solution for this kind of systems, but there exist fundamental limitations to their applicability when high precisions, long standoffs or large apertures are needed, and when there are difficult operating conditions. Other methods are, in general, not applicable in hostile environments or inadequate for on-line measurement. In this paper we review the latest research in Conoscopic Holography, an interferometric technique that has been applied successfully in this kind of applications, ranging from submicrometric roughness measurements, to long standoff sensors for surface defect detection in steel at high temperatures.
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