Type of Document	Master's Thesis
Author	Pedrazzani, Janet Renee
Author's Email Address	jerp@optics.rochester.edu
URN	etd-0104100-092104
Title	High-Temperature Displacement Sensor Using a White-Light Scanning Fiber Michelson Interferometer
Degree	Master of Science
Department	Electrical and Computer Engineering
Advisory Committee	Advisor Name Title Murphy, Kent A. Committee Chair Claus, Richard O. Committee Member Wang, Anbo Committee Member
Keywords	sapphire fiber absolute displacement sensor Michelson white-light interferometery
Date of Defense	1996-04-16
Availability	unrestricted
Abstract As specialized materials are developed for various applications, it becomes desirable to test them under adverse conditions, such as at elevated temperatures and in harsh environments. It is increasingly important that sensors be developed to meet the growing needs of research and industry. The ability of sapphire to withstand elevated temperatures and many chemically harsh environments has long been recognized. However, currently available sapphire fiber possesses poor optical quality and is not available with a cladding. It has found use in a variety of temperature sensors, but the investigation of sapphire-based strain and displacement sensors has been limited. The primary development of a white-light Michelson interferometer that utilizes a sapphire fiber sensing head is presented in this thesis. Development includes efforts to combat the poor optical quality of the sapphire fiber, minimize polarization mode fading, and preferentially excite the fundamental mode of the sapphire fiber. This thesis demonstrates the feasibility of fabricating a Michelson white-light interferometer capable of measuring displacements in environments ranging from room temperature to 800 degrees Celsius. The sensor developed in this work is capable of measuring displacements exceeding 6.4 millimeters at room temperature, and exceeding 1 millimeter at 800 degrees Celsius. This thesis also presents the application of this sensor to the alignment of a sapphire-fiber based Fabry-Perot sensor. This technique allows the Fabry-Perot sensor to be aligned so that usable fringes are always obtained. Alignment of the sapphire-fiber based Fabry-Perot sensors has been considered prohibitively difficult.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    Abstract.pdf 16.89 Kb 00:00:04 00:00:02 00:00:02 00:00:01 < 00:00:01   Acknowledgements.pdf 15.59 Kb 00:00:04 00:00:02 00:00:01 < 00:00:01 < 00:00:01   chap1f_nr.pdf 118.34 Kb 00:00:32 00:00:16 00:00:14 00:00:07 < 00:00:01   chap2f_nr.pdf 72.67 Kb 00:00:20 00:00:10 00:00:09 00:00:04 < 00:00:01   chap3f_nr.pdf 1.00 Mb 00:04:37 00:02:22 00:02:05 00:01:02 00:00:05   chap4_pg103_107.pdf 5.18 Mb 00:23:58 00:12:20 00:10:47 00:05:23 00:00:27   chap4_pg60_69.pdf 6.86 Mb 00:31:44 00:16:19 00:14:16 00:07:08 00:00:36   chap4_pg70_84.pdf 3.47 Mb 00:16:03 00:08:15 00:07:13 00:03:36 00:00:18   chap4_pg85_91.pdf 11.89 Mb 00:55:03 00:28:18 00:24:46 00:12:23 00:01:03   chap4_pg92_96.pdf 6.76 Mb 00:31:16 00:16:05 00:14:04 00:07:02 00:00:36   chap4_pg97_102.pdf 10.14 Mb 00:46:57 00:24:08 00:21:07 00:10:33 00:00:54   chap5_future_work.pdf 19.29 Kb 00:00:05 00:00:02 00:00:02 00:00:01 < 00:00:01   Conclusions.pdf 12.29 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01   Illustrations.pdf 23.18 Kb 00:00:06 00:00:03 00:00:02 00:00:01 < 00:00:01   References.pdf 41.12 Kb 00:00:11 00:00:05 00:00:05 00:00:02 < 00:00:01   TOC.pdf 22.82 Kb 00:00:06 00:00:03 00:00:02 00:00:01 < 00:00:01   Vita.pdf 12.36 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01

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