Low-coherence interferometry – an advanced technique for optical metrology in industry

Authors: Dufour, M L; Lamouche, G; Detalle, V; Gauthier, B; Sammut, P

Source: Insight - Non-Destructive Testing and Condition Monitoring, Volume 47, Number 4, 1 April 2005 , pp. 216-219(4)

Publisher: The British Institute of Non-Destructive Testing

Buy & download fulltext article:


Price: $25.00 plus tax (Refund Policy)


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 fibres is rugged enough to be used in industrial environments and the fibre-linked optical probe may be miniaturised for accessing tight locations. Among industrial applications developed at IMI, several cases for which LCI has been particularly useful, such as an elongational rheometer (RME), characterisation of wear damages on coating and laser-induced breakdown spectroscopy (LIBS), will be presented. The RME is an instrument in which a polymer sample is stretched in a controlled temperature furnace at up to 350°C. 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 analysing 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.

Document Type: Research Article

DOI: http://dx.doi.org/10.1784/insi.

Affiliations: Industrial Materials Institute, National Research Council, Boucherville, Quebec, Canada

Publication date: April 1, 2005

More about this publication?
Related content



Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content

Text size:

A | A | A | A
Share this item with others: These icons link to social bookmarking sites where readers can share and discover new web pages. print icon Print this page