Chen, Tong
(2012)
Fiber Optic Sensors for Extreme Environments.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Optical fiber based sensors offer several important advantages over electronic sensors, including low manufacturing cost, miniature and flexible structures, immunities to electromagnetic fields, and the capability of distributive and multi-parameter sensing on a single fiber. Extreme harsh environments such as temperature >800°C or as low as a few Kelvin, present unique challenges and opportunities to fiber optic sensors. For example, hydrogen gas leak detection in cryogenic environment is critically important in the production and use of liquid hydrogen fuels. But the sensitivity of conventional Palladium (Pd) coated hydrogen sensors degrade rapidly when temperature decreases. Another example is the quick diminishing of conventional type-I gratings with temperature range beyond 500°C, which prevent the FBG implementation in numerous high temperature applications.
The objective of this thesis is to explore new fiber sensing technologies that have significant performance enhancements, or were previously not possible in extreme environment applications. Optically heated fiber sensors were developed for cryogenic Hydrogen gas and liquid level sensing in environments as well as room temperature gas flow sensing. Regenerated gratings were developed for high temperature pressure sensing. Novel in-fiber sensing techniques such as Rayleigh and Raman scattering were also exploited for fully distributed sensing operations. These technologies and devices offer reliable and flexible sensing solutions extreme environments in energy, transportation and telecom industry.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
4 June 2012 |
| Date Type: |
Publication |
| Defense Date: |
28 March 2012 |
| Approval Date: |
4 June 2012 |
| Submission Date: |
5 April 2012 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
136 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Electrical Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Fiber Sensor |
| Date Deposited: |
04 Jun 2012 18:16 |
| Last Modified: |
15 Nov 2016 13:57 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/11722 |
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