Miniature Fiber-Optic Sensors for High-Temperature Harsh Environments

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dc.contributor.authorZhu, Yizhengen
dc.contributor.committeechairWang, Anboen
dc.contributor.committeememberXu, Yongen
dc.contributor.committeememberHeflin, James R.en
dc.contributor.committeememberPickrell, Gary R.en
dc.contributor.committeememberJacobs, Iraen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:12:10Zen
dc.date.adate2007-06-05en
dc.date.available2014-03-14T20:12:10Zen
dc.date.issued2007-05-03en
dc.date.rdate2010-10-08en
dc.date.sdate2007-05-17en
dc.description.abstractMeasurement of physical parameters in harsh environments (high pressure, high temperature, highly corrosive, high electromagnetic interference) is often desired in a variety of areas, such as aerospace, automobile, energy, military systems, and industrial processes. Pressure and temperature are among the most important of these parameters. A typical example is pressure monitoring in jet engine compressors to help detect and control undesirable air flow instabilities, namely rotating stall and surge. However, the temperatures inside a compressor could reach beyond 600°C for today's large engines. Current fiber-optic sensor can operate up to about 300°C and even the most widely employed semiconductor sensors are limited below 500°C. The objective of this research is to push the limit of fiber-optic sensing technology in harsh environment applications for both pressure and temperature measurements by developing novel sensing structures, fabrication techniques, and signal processing algorithms. An all-fused-silica pressure sensor has been demonstrated which is fabricated on the tip of a fiber with a diameter no larger than 125μm. The sensor was able to function beyond the current limit and operate into the 600~700°C range. Also a temperature sensor has been developed using sapphire fibers and wafers for ultra-high temperature measurement as high as 1600°C. This effort will generate more understanding regarding sapphire fiber's high temperature properties and could possibly lead to novel designs of pressure sensor for beyond 1000°C. Both sensors have been field tested in real-world harsh environments and demonstrated to be reliably and robust. In this dissertation, the design, fabrication, and testing of the sensors are discussed in detail. The system and signal processing techniques are presented. The plan and direction for future work are also suggested with an aim of further pushing the operating limit of fiber-optic sensors.en
dc.description.degreePh. D.en
dc.identifier.otheretd-05172007-235731en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05172007-235731/en
dc.identifier.urihttp://hdl.handle.net/10919/27762en
dc.publisherVirginia Techen
dc.relation.haspartDissertation_Zhu.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectwhite-light interferometryen
dc.subjectfiber-optic sensoren
dc.subjecttemperature sensoren
dc.subjectminiatureen
dc.subjectpressure sensoren
dc.titleMiniature Fiber-Optic Sensors for High-Temperature Harsh Environmentsen
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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