Abstract

first_page settings Order Article Reprints Font Type: Arial Georgia Verdana Font Size: Aa Aa Aa Line Spacing:    Column Width:    Background: Open AccessAbstract Exploiting Brillouin Sensors for Refractive Index Measurements † by Aldo Minardo *, Ester Catalano *, Agnese Coscetta * and Luigi Zeni * Department of Industrial&Information Enginnering, Universita’ degli Studi della Campania “Luigi Vanvitelli”, Via Roma 29-81031 Aversa, Italy * Authors to whom correspondence should be addressed. † Presented at the 5th International Symposium on Sensor Science (I3S 2017), Barcelona, Spain, 27–29 September 2017. Proceedings 2017, 1(8), 818; https://doi.org/10.3390/proceedings1080818 Published: 4 December 2017 (This article belongs to the Proceedings of Proceedings of the 5th International Symposium on Sensor Science (I3S 2017)) Download Download PDF Download PDF with Cover Download XML Versions Notes In this paper, we investigate the capability of a Brillouin Optical Time-Domain Analysis (BOTDA) sensor to act, for specific fiber sections, as a refractometer. In the BOTDA configuration, a pump pulse is launched from one end of the sensing fiber, while a frequency-detuned probe wave is injected from the opposite end. Measuring the output probe intensity as a function of time and for several pump/probe frequency shifts, the strain and/or temperature changes can be recovered at each position. The same apparatus can be used for refractive index measurements in selected points, provided that some means is found to convert the refractive index changes in optical transmission changes. In fact, the localized optical loss can be easily recovered from the acquired data, as each attenuation point along the fiber will induce a step-like change in the detected signal. The minimum distance between consecutive refractive index sensing points is dictated by the spatial resolution of the BOTDA sensor (and therefore by the duration of the pump pulse), while the maximum number of sensing locations will be limited by the ratio between the optical budget (i.e., the maximum optical loss that can be tolerated by the interrogation system) and the (maximum) optical loss in each sensing location. © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Share and Cite MDPI and ACS Style Minardo, A.; Catalano, E.; Coscetta, A.; Zeni, L. Exploiting Brillouin Sensors for Refractive Index Measurements. Proceedings 2017, 1, 818. https://doi.org/10.3390/proceedings1080818 AMA Style Minardo A, Catalano E, Coscetta A, Zeni L. Exploiting Brillouin Sensors for Refractive Index Measurements. Proceedings. 2017; 1(8):818. https://doi.org/10.3390/proceedings1080818 Chicago/Turabian Style Minardo, Aldo, Ester Catalano, Agnese Coscetta, and Luigi Zeni. 2017. "Exploiting Brillouin Sensors for Refractive Index Measurements" Proceedings 1, no. 8: 818. https://doi.org/10.3390/proceedings1080818 Find Other Styles Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here. Article Metrics No No Article Access Statistics Multiple requests from the same IP address are counted as one view.

Highlights

  • We investigate the capability of a Brillouin Optical Time-Domain Analysis (BOTDA) sensor to act, for specific fiber sections, as a refractometer

  • In the BOTDA configuration, a pump pulse is launched from one end of the sensing fiber, while a frequency-detuned probe wave is injected from the opposite end

  • The same apparatus can be used for refractive index measurements in selected points, provided that some means is found to convert the refractive index changes in optical transmission changes

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Introduction

Exploiting Brillouin Sensors for Refractive Index Measurements † Aldo Minardo *, Ester Catalano *, Agnese Coscetta * and Luigi Zeni *

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