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Z. Djinovic, M.C. Tomic, S. Mitic, M. Cordes, P. Adrigan, A. Vujanic, C. Kment:
"High Resolution Measurement of Wear Rate Using Low Coherence Interferomtery Based on a 3x3 Fiber Optic Coupler";
Talk: 1st Vienna International Conference on Micro- and Nano-Technology - Viennano'05, Vienna, Austria; 03-09-2005 - 03-11-2005; in: "1st Vienna International Conference on Micro- and Nano-Technology - Proceedings", Österreichische Tribologische Gesellschaft, Wien (2005), ISBN: 3-901657-17-7; 423 - 430.

We propose here a contact-less optical method for remote measurement of the pin wear rate at a standard pin-to-disc
and ball-to-flat tribometer. The method is based on the interference of low-coherence radiation and it is performed by a
fiber optic configuration. Displacement sensor head is a single mode optical fiber of the one output branch of 3x3
coupler. All data are obtained by an interferometric reading of the sensing fiber displacement by scanning technique
employing a mechanical scanner. We proved the capability of the method by experimental investigation of wear rate of
the pin made from different materials. For example, we obtained nanometer scale resolution per second of wear rate of
the polymer composite pin in relatively broad range of measurement over 500 μm. The resolution of the method is
mainly determined by the resolution of the scanning technique (24576 points per mm, i.e. about 40 nm), applied in the
read-out interferometer.

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