Intrinsic Fabry-Perot Interferometric Fiber Sensor Based on Ultra-Short Bragg Gratings for Quasi-Distributed Strain and Temperature Measurements

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dc.contributor.authorWang, Zhuangen
dc.contributor.committeechairWang, Anboen
dc.contributor.committeememberMeehan, Kathleenen
dc.contributor.committeememberHeflin, James R.en
dc.contributor.committeememberJacobs, Iraen
dc.contributor.committeememberLiu, Yiluen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:21:02Zen
dc.date.adate2007-02-02en
dc.date.available2014-03-14T20:21:02Zen
dc.date.issued2006-12-14en
dc.date.rdate2007-02-02en
dc.date.sdate2006-12-21en
dc.description.abstractThe health monitoring of smart structures in civil engineering is becoming more and more important as in-situ structural monitoring would greatly reduce structure life-cycle costs and improve reliability. The distributed strain and temperature sensing is highly desired in large structures where strain and temperature at over thousand points need to be measured simultaneously. It is difficult to carry out this task using conventional electrical strain sensors. Fiber optic sensors provide an excellent opportunity to fulfill this need due to their capability to multiplex many sensors along a single fiber cable. Numerous research studies have been conducted in past decades to increase the number of sensors to be multiplexed in a distributed sensor network. This dissertation presents detailed research work on the analysis, design, fabrication, testing, and evaluation of an intrinsic Fabry-Perot fiber optic sensor for quasi-distributed strain and temperature measurements. The sensor is based on two ultra-short and broadband reflection fiber Bragg gratings. One distinct feature of this sensor is its ultra low optical insertion loss, which allows a significant increase in the sensor multiplexing capability. Using a simple integrated sensor interrogation unit and an optical spectrum based signal processing algorithm, many sensors can be interrogated along a single optical fiber with high accuracy, high resolution and large dynamic range. Based on the experimental results and theoretical analysis, it is expected that more than 500 sensors can be multiplexed with little crosstalk using a frequency-division multiplexing technology. With this research, it is possible to build an easy fabrication, robust, high sensitivity and quasi-distributed fiber optic sensor network that can be operated reliably even in harsh environments or extended structures. This research was supported in part by U.S. National Science Foundation under grant CMS-0427951.en
dc.description.degreePh. D.en
dc.identifier.otheretd-12212006-203046en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12212006-203046/en
dc.identifier.urihttp://hdl.handle.net/10919/30213en
dc.publisherVirginia Techen
dc.relation.haspartdissertation_zhuang2006.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectFiber Bragg Gratingen
dc.subjectFabry-Peroten
dc.subjectMultiplexingen
dc.subjectFiber Optic Sensoren
dc.subjectTemperatureen
dc.subjectStrainen
dc.subjectSmart Structureen
dc.subjectHealth Monitoringen
dc.titleIntrinsic Fabry-Perot Interferometric Fiber Sensor Based on Ultra-Short Bragg Gratings for Quasi-Distributed Strain and Temperature Measurementsen
dc.typeDissertationen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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