Title page for ETD etd-01262010-020150


Type of Document Master's Thesis
Author Fang, Xiaojun
URN etd-01262010-020150
Title Sapphire fiber based high temperature extensometer
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Claus, Richard O. Committee Member
Murphy, Kent A. Committee Member
Wang, Anbo Committee Member
Keywords
  • Materials at high temperatures
Date of Defense 1994-05-05
Availability restricted
Abstract

New sapphire fiber based sensor structures for high temperature strain measurement are proposed and studied in this report. The self-mixing interferometry has been studied and tested. The advantage of this technique is the source coherence insensitivity and direction distinguishment capability. Fringes of the self-mixing interferometer built with standard multimode fiber and sapphire fiber were observed. The application of this technique to static strain rneasurement seems difficult to stabilize, whereas its implementation to acoustic sensing with single-mode fiber coil as the sensing component will be very interesting. The approach by Moire interferometry and equal-path coherence matching interferometer are two promising methods for high temperature displacement measurement. The advantages of the Moire interferometer are source coherence independence and large measurement range. The advantage of coherence matching absolute interferometer is its simplicity in sensor structure. The structures of coherence matching methods and multiplexing techniques are generalized. From this research, we can conclude that the sapphire fiber based high temperature extensometer may be realized by different methods.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
[VT] LD5655.V851_1994.F364.pdf 1.15 Mb 00:05:19 00:02:44 00:02:23 00:01:11 00:00:06
[BTD] next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.