Adaptive autofocus technique for speckle control in optical feedback interferometry

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To access the full text documents, please follow this link: http://hdl.handle.net/2117/25609

dc.contributor	Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria
dc.contributor	Universitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica
dc.contributor.author	Atashkhooei, Reza
dc.contributor.author	Royo Royo, Santiago
dc.contributor.author	Azcona Guerrero, Francisco Javier
dc.date	2014-09-01
dc.identifier.citation	Atashkhooei, R.; Royo, S.; Azcona, F. Adaptive autofocus technique for speckle control in optical feedback interferometry. "Sensors and actuators A. Physical", 01 Setembre 2014, vol. 216, p. 243-248.
dc.identifier.citation	0924-4247
dc.identifier.citation	10.1016/j.sna.2014.06.003
dc.identifier.uri	http://hdl.handle.net/2117/25609
dc.language.iso	eng
dc.relation	http://www.sciencedirect.com/science/article/pii/S0924424714002982
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject	Àrees temàtiques de la UPC::Física::Acústica
dc.subject	Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica
dc.subject	Detectors
dc.subject	Interferometry
dc.subject	Speckle
dc.subject	Vibration
dc.subject	Adaptive measurements
dc.subject	Displacement sensor
dc.subject	Feedback control
dc.subject	Self-mixing interferometry
dc.subject	Speckle effect
dc.subject	Vibration measurement
dc.subject	SELF-MIXING INTERFEROMETRY
dc.subject	LASER-DIODE
dc.subject	DISPLACEMENT
dc.subject	VIBRATION
dc.subject	Detectors
dc.subject	Interferometria
dc.subject	Vibració
dc.title	Adaptive autofocus technique for speckle control in optical feedback interferometry
dc.type	info:eu-repo/semantics/publishedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	An adaptive autofocus technique for the control of speckle effect in optical feedback interferometry (OFI) is discussed. The beam spot size effect over the OFI signal is presented, justifying the proposed approach. An automated setup for the control of speckle effect using a liquid lens with electro-optical focusing is demonstrated. The spot size is modified according to the signal to noise ratio (SNR) bounds selected for the captured OFI signal, therefore avoiding signal fading caused by speckle effect and possible chaotic behavior because of strong feedback. The quality and shape of the acquired OFI signal when the spot size change takes place shows a transient oscillation without any additional effects over the OFI SNR and the OFI shape. Experimental examples are provided proving the effectiveness of the approach for speckle control in displacement and velocity measurements within a movement range of 20 mm. (C) 2014 Elsevier B.V. All rights reserved.

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