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Digital demodulation using I/Q signals and optical phase control applied to a vibrometer

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Show simple item record Gálvez-Límaco, Ángel Manuel Henrique Galeti, José Silva, Emílio Carlos Nelli Higuti, Ricardo Tokio Connelly, Michael J. Kitano, Cláudio 2020-06-10T11:23:08Z 2020-06-10T11:23:08Z 2020
dc.description peer-reviewed en_US
dc.description.abstract An efficient and cost effective optical phase detection vibrometer based on a modified closed loop homodyne Michelson interferometer is presented. Real-time phase demodulation is carried out, using an embedded platform that performs data acquisition, signal processing, PI (proportional-integral) control and the generation of signals that drive the electrooptic Pockels cell phase shifter and the piezoelectric actuator under test. Two phase quadrature signals are generated from a single interferometric output, using the interleaving action, in alternation, of a digitally generated modulating signal, and then the wellknown differential-cross-multiplication technique is applied to perform the computation of the phase shift of interest. The quadrature condition is reached using the PI loop based on an error signal obtained from a Lissajous figure derived from out-of-phase signals. The vibrometer is capable of measuring nanometric displacements, and is simple, inexpensive, accurate, immune to fading and self-consistent. The new method was used to determine the displacement frequency response curves of two prototypes of multi-actuated flextensional piezoelectric actuators. Measurements were made between 500 Hz and 15 kHz, and the results agreed with those obtained by the standard SCM-Signal Coincidence Method. en_US
dc.language.iso eng en_US
dc.publisher IEEE Computer Society en_US
dc.relation.ispartofseries IEEE Sensors Journal; 20 (19), pp. 11313-11325
dc.rights © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. en_US
dc.subject optical interferometry en_US
dc.subject piezoelectric transducers en_US
dc.subject signal processing en_US
dc.subject metrology en_US
dc.title Digital demodulation using I/Q signals and optical phase control applied to a vibrometer en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1109/JSEN.2020.2997900
dc.contributor.sponsor CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico – en_US
dc.contributor.sponsor CAPES Foundation, Ministry of Education of Brazil en_US
dc.relation.projectid 420673/2016, en_US
dc.relation.projectid 305546/2017-1 en_US
dc.relation.projectid 302658/2018-1 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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