Title page for ETD etd-03142009-040658
|Type of Document
||K. C., Ravikumar
||Spread spectrum techniques for distributed multimeasurand optical fiber sensors
||Master of Science
|Claus, Richard O.
|Murphy, Kent A.
|Date of Defense
Spread spectrum techniques offer an alternate solution to the urgency for distributed
optical fiber sensors. These techniques are based on the properties of pseudorandom
sequences that have triangular autocorrelation functions with peaks only at regions of no
delay. This affords an opportunity to give the desired signal a power advantage over
many types of interference and noise.
A study in employing spread spectrum techniques for multiplexing optical fiber sensors is
presented. A mathematical analysis of the system is conducted with due consideration
given to performance issues. Simulations in software are conducted to characterize
system performance. Hardware developed for this project operates at over 1 Mbps and is
capable of simultaneously monitoring four sensors. Real time experiments conducted on
these multiplexed sensors affirm the technical feasibility of the system. Configurations for
viable applications of the system are also suggested.
|| Approximate Download Time
| 28.8 Modem
|| 56K Modem
|| ISDN (64 Kb)
|| ISDN (128 Kb)
|| Higher-speed Access
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.
If you have questions or technical
problems, please Contact DLA.