Evaluation of the usage of a fiber optic low-coherence interferometer for surface profile measurements using speckles analysis

Robert Schmitt; Guilherme Mallmann

doi:10.1117/12.870754

13 September 2010 Evaluation of the usage of a fiber optic low-coherence interferometer for surface profile measurements using speckles analysis

Robert Schmitt, Guilherme Mallmann

Author Affiliations +

Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73870N (2010) https://doi.org/10.1117/12.870754
Event: Speckle 2010, 2010, Florianapolis, Brazil

Abstract

The low-coherence interferometry is already an established technique for the high-resolution characterization of surface profiles. Its application in many industrial areas is however partially limited due to undesired effects in the interference pattern caused by different surface's roughness and form properties. The appearance of speckles in rough surfaces or the batwing-effect in high-precision topographies are examples of undesired influences. Another important limiting factor is the size and robustness of the metrological set-ups. The measurement of small cavities or the integration in production machines are therefore still a challenge. In this work the application of a fiber-optical low-coherence interferometer for the characterization of different surface profiles, as well as miniaturized and / or hard accessible features is presented. Focus will be given on the measurement of optical "uncooperative" surfaces, as rough and / or curved surfaces, for example in small cavities, using the analysis of the speckle phenomena.

Citation Download Citation

Robert Schmitt and Guilherme Mallmann "Evaluation of the usage of a fiber optic low-coherence interferometer for surface profile measurements using speckles analysis", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73870N (13 September 2010); https://doi.org/10.1117/12.870754

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