Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

Fiber Optic Sensors for Extreme Environments

Chen, Tong (2012) Fiber Optic Sensors for Extreme Environments. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

Primary Text

Download (13MB) | Preview


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.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Chen, Tongtoc2@pitt.eduTOC2
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairChen, Pengpec9@pitt.eduPEC9
Committee MemberCho, Sung Kwonskcho@pitt.eduSKCHO
Committee MemberEl Nokali, Mahmoudmen@pitt.eduMEN
Committee MemberLi, Guangyonggul6@pitt.eduGUL6
Committee MemberSun, Mingguidrsun@pitt.eduDRSUN
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


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item