Type of Document	Master's Thesis
Author	Ranade, Jaydeep
Author's Email Address	jranade@vt.edu
URN	etd-81297-101758
Title	Electronic Signal Processing in an Optical Fiber-Based Magnetometer
Degree	Master of Science
Department	Electrical Engineering
Advisory Committee	Advisor Name Title Dr. Anbo Wang Committee Chair Kent A. Murphy none Richard O. Claus none
Keywords	Optic fiber Magnetic field measurement
Date of Defense	1997-09-11
Availability	unrestricted
Abstract Conventional Extrinsic Fabry-Perot Interferometric (EFPI) sensors have been used to measure a variety of physical parameters like temperature, pressure and strain. A modified version of this geometry is successfully implemented to measure low-level magnetic field densities. A complete optical fiber based magnetometer system consisting of sensor head, laser source, opto-electronics, signal demodulation circuitry and display is designed, fabricated and tested. Various electronic signal demodulation schemes are discussed. The Quadrature Phase Shifted EFPI signal demodulation scheme, used in the system, is studied in detail. The scheme is designed and implemented in both analog and digital domain and the advantages and drawbacks of each type are presented. Primary limitations in the measurement of extremely low-level magnetic field densities are discussed and methods to overcome them using electronic signal processing schemes are suggested for future consideration.
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 6.98 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   Acknowl.pdf 6.44 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   Appendix.pdf 27.64 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01   Ch1.pdf 16.59 Kb 00:00:04 00:00:02 00:00:02 00:00:01 < 00:00:01   Ch2.pdf 31.65 Kb 00:00:08 00:00:04 00:00:03 00:00:01 < 00:00:01   Ch3.pdf 29.52 Kb 00:00:08 00:00:04 00:00:03 00:00:01 < 00:00:01   Ch4.pdf 43.78 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01   Ch5.pdf 69.78 Kb 00:00:19 00:00:09 00:00:08 00:00:04 < 00:00:01   Ch6.pdf 9.58 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01   Contents.pdf 14.96 Kb 00:00:04 00:00:02 00:00:01 < 00:00:01 < 00:00:01   Etd.pdf 4.25 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   Figlist.pdf 9.97 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01   Referenc.pdf 10.49 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01   Snap1.pdf 37.99 Kb 00:00:10 00:00:05 00:00:04 00:00:02 < 00:00:01   Snap2.pdf 43.75 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01   Snap3.pdf 43.91 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01   Snap4.pdf 32.74 Kb 00:00:09 00:00:04 00:00:04 00:00:02 < 00:00:01   Title.pdf 4.48 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   Vita.pdf 5.85 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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