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ANALYSIS AND IMPLEMENTATION OF ALGORITHMS FOR EMBEDDED SELF-MIXING DISPLACEMENT SENSORS DESIGN

Antonio Luna Arriaga 1
1 LAAS-OSE - Équipe Optoélectronique pour les Systèmes Embarqués
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : The interaction between an emitted laser beam and a small portion of backscattered light from a pointed target that re-enters the laser's cavity, is at the origin of optical feedback phenomenon or self-mixing. Exploiting these unconventional interferometric fringes for non-contact sensors is attractive due to its minimal optical part-count and self-aligned nature. In this thesis we approach its development as a cost-e ective embedded implementation for displacement measurement. To this end we explored signal processing methods for fringe detection and target's movement reconstruction, avoiding the usage of external components. We first identified some incompatibilities in prior algorithms from our research center, and then proposed further solutions. Based on interpolation theory, a simplified but proved real-time algorithm resulted for displacement reconstruction. Relying on analytical signal elaboration, an improved approach for phase calculation allowed us to provide a fringe detection algorithm robust to amplitude variations, disregarding the feedback regime and thus, allowing a seemly usage over an increased variety of applications.
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https://tel.archives-ouvertes.fr/tel-01063295
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Submitted on : Friday, September 12, 2014 - 4:36:38 PM
Last modification on : Thursday, June 10, 2021 - 3:03:05 AM
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  • HAL Id : tel-01063295, version 1

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Antonio Luna Arriaga. ANALYSIS AND IMPLEMENTATION OF ALGORITHMS FOR EMBEDDED SELF-MIXING DISPLACEMENT SENSORS DESIGN. Optics / Photonic. Institut National Polytechnique de Toulouse - INPT, 2014. English. ⟨tel-01063295⟩

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