Zhao, Kehao
(2025)
Fiber Optic Sensors Enabled by Femtosecond Laser for Energy and Biomedical Applications.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Fiber optic sensors, as a flexible and adaptive sensor technology, have been widely used in nuclear power generation, infrastructure monitoring, fossil fuel exploration, disease diagnosis, drug screening, and environmental monitoring. Compared with traditional electronic sensors, fiber optic sensors offer advantages such as immunity to electromagnetic interference, high-temperature resistance, low cost, multiplexability, and biocompatibility.
Although commercial fiber optic sensors have been applied to measure parameters in the energy field, such as temperature and strain, they still have significant deficiencies as passive sensors in performing active measurements like liquid level and flow velocity, which require the sensors to be energized. Meanwhile, the application of fiber optic sensors in biomedical sector faces challenges such as high manufacturing costs, signal instability, and complex signal processing, limiting their broader application.
This thesis presents an integrated femtosecond laser fabrication approach to produce fiber optic sensors in the forms of multiplexed Fiber Bragg Gratings (FBGs), Rayleigh-enhanced distributed fiber sensors, and intrinsic Fabry-Perot interferometers (IFPIs). For energy applications, by optimizing the laser fabrication process, high-temperature and radiation-hardened fiber sensors are fabricated and tested for flow, liquid level, strain, and temperature measurement in multiple extreme environments. In the biomedical field, embedding FBG sensors into multilayer microfluidic chips enables low-cost, high-resolution temperature and flow monitoring. All these technologies and devices offer reliable and flexible sensing solutions for both energy and biomedical sectors, enabling capabilities that were not previously possible.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
7 January 2025 |
| Date Type: |
Publication |
| Defense Date: |
5 November 2024 |
| Approval Date: |
7 January 2025 |
| Submission Date: |
20 October 2024 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
117 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Electrical and Computer Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Fiber Optic Sensor |
| Date Deposited: |
07 Jan 2025 21:04 |
| Last Modified: |
07 Jan 2025 21:04 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/47012 |
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