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Proceedings 2017, 1(4), 373; doi:10.3390/proceedings1040373

Impact of High Coupling Factor in Absolute Distance Measurement with Self-Mixing Interferometry

LAAS-CNRS, Université de Toulouse, CNRS, INP, 31071 Toulouse, France
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
Author to whom correspondence should be addressed.
Published: 16 August 2016
(This article belongs to the Proceedings of Eurosensors 2017)
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Absolute distance measurement by means of a self-mixing interferometer (SMI) can be obtained by modulating the laser frequency. This modulation is typically achieved through the modulation of the laser injection current with a triangle waveform. Various strategies have been proposed to increase the performances and recent researches have shown real-time performance of SMI with resolution reaching 100 μm for distances up to 2 m. In the present paper, we demonstrate for the first time, both experimentally and by modeling, that with high coupling factors between the laser and the target, disappearance of interferometric fringes occurs that can strongly affect the measurement reliability.
Keywords: self-mixing; absolute distance; high coupling factor; distance measurement self-mixing; absolute distance; high coupling factor; distance measurement
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Veng, M.; Perchoux, J.; Bony, F. Impact of High Coupling Factor in Absolute Distance Measurement with Self-Mixing Interferometry. Proceedings 2017, 1, 373.

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