Title page for ETD etd-05172011-134544

Type of Document Master's Thesis
Author Ivanov, Georgi Pavlov
Author's Email Address ivanovg@vt.edu
URN etd-05172011-134544
Title Fabry-Perot Sapphire Temperature Sensor for Use in Coal Gasification
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Wang, Anbo Committee Chair
Pickrell, Gary R. Committee Member
Xu, Yong Committee Member
  • Fabry-Perot
  • White-light Interferometry
  • Fourier Analysis
  • Optical Fiber Sensors
Date of Defense 2011-05-03
Availability unrestricted
Sapphire fiber based temperature sensors are exceptional in their ability to operate at temperatures above 1000ºC and as high as 1800ºC. Sapphire fiber technology is emerging and the fiber is available commercially. Sapphire fiber has a high loss, is highly multi-mode and does not have a solid cladding, but it is nonetheless very useful in high temperature applications. Of the available interferometer configurations, Fabry-Perot interferometers are distinguished in their high accuracy and great isolation from sources of error.

In this thesis, improvements are reported to an existing design to enhance its reliability and to reduce possible modes of failure. The existing high temperature sensor design has shown a lot of potential in the past by continuously measuring the temperature in a coal gasifier for 7 months, but its true potential has not yet been realized. The goal of this work and the work of many others is to extend the working life and reliability of high-temperature optical sapphire temperature sensors in harsh environments by exploring a solid cladding for sapphire fiber, improved fringe visibility sapphire wafers and a new sensor design. This project is supported by the National Energy and Technology Laboratory of the Department of Energy.

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