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Optical Distributed Sensing: Reel-To-Reel Fabrication of Quasi-Distributed FBGs for Improved Scattering Signal and Enhanced Harsh Environment Stability

Zhong, Shuda (2021) Optical Distributed Sensing: Reel-To-Reel Fabrication of Quasi-Distributed FBGs for Improved Scattering Signal and Enhanced Harsh Environment Stability. Master's Thesis, University of Pittsburgh. (Unpublished)

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Bragg gratings inscribed in optical fiber are key components for both multiplexable and distributed optical sensing. Comparing with other sensor devices, Bragg grating based fiber sensors offer a number of advantages include low manufacturing cost, immunity to electromagnetic fields (IMFs), long lifetimes, high sensitivity, multiplexing, and environmental ruggedness. Bragg grating based fiber sensor arrays have been used extensive to perform structural health monitoring for large civil and mechanic structures. To perform high spatial resolution measurements on large structures, thousands of grating devices need to be multiplexed on a single fiber.
In this thesis, a fully automated reel-to-reel fiber handling system is designed and integrated into a KrF 248-nm excimer laser, enabling continuous Bragg grating fabrication using a phase mask approach. Through the control of fiber tension and spooling speed, grating sensor can be inscribed continuously at desired locations within 5-mm accuracy. One hundred fifty evenly spaced FBGs have been successfully inscribed in a single fiber with 3-cm spacing, spectral and spatial characteristics of these fiber sensors are characterized using an Optical Backscatter Reflectometry (OBR). The spectral accuracy was within 0.5-nm of the designed grating wavelength, which are sufficient for both optical time domain reflectometry and optical frequency domain reflectometry interrogation. The successful development of this fully automated grating fabrication system enable development of fiber sensing cables for a wide array of applications.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Zhong, Shudashz116@pitt.edushz116@pitt.edu0000-0003-1136-2544
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairChen, Kevin
Committee MemberMao,
Committee MemberZhan,
Date: 13 June 2021
Date Type: Publication
Defense Date: 1 April 2021
Approval Date: 13 June 2021
Submission Date: 1 April 2021
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 48
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical and Computer Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Quasi-distributed FBGs, Optical fiber sensors
Date Deposited: 13 Jun 2021 18:44
Last Modified: 13 Jun 2021 18:44


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