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16th WCNDT 2004 - World Conference on NDT
CD-ROM Proceedings, Internet Version of ~600 Papers
Aug 30 - Sep 3, 2004 - Montreal, Canada
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SESSION: OPTICAL TECHNIQUE
ABSTRACT:
LOW-COHERENCE INTERFEROMETRY, AN ADVANCED TECHNIQUE FOR OPTICAL 
METROLOGY IN INDUSTRY 
M. L. Dufour, G. Lamouche, V. Detalle, B. Gauthier, and P. Sammut 
Industrial Materials Institute, National Research Council Canada, Boucherville, Quebec, Canada



Low-coherence interferometry (LCI) is an optical technique that may be used for industrial surface 
metrology with accuracy in the micron range. An instrument made with optical fibers is rugged enough to be 
used in industrial environments and the fiber- linked optical probe may be miniaturized for accessing tight 
locations. Among industrial applications developed at IMI we will present several cases for which LCI has 
been particularly useful such as an elongational rheometer (RME), characterization of wear damages on 
coating and Laser-induced Breakdown Spectroscopy (LIBS). The RME is an instrument in which a polymer 
sample is stretched in a controlled temperature furnace at up to 350oC. LCI has been used for monitoring the 
thickness of the samples. Wear damage is quantified by the volume loss after a wear test. It requires a high 
depth resolution (axis perpendicular to the surface) but a relatively coarse transverse resolution. The LIBS is 
a technique that has been used for analyzing the chemical composition of materials as a function of depth. 
LCI has been integrated to a LIBS instrument for measuring accurately the crater depth between each laser 
shot. Other industrial applications will also be presented.
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MAIN AUTHOR:Marc Dufour, National Research Council Canada - Industrial Material Institute, Canada
Paper CODE: 671

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