Doctoral Dissertations


Yiyang Zhuang

Keywords and Phrases

Fiber optic sensing; Fiber optics


"Fiber optic sensors (FOSs) have been widely used for measuring various physical and chemical measurands owing to their unique advantages over traditional sensors such as small size, high resolution, distributed sensing capabilities, and immunity to electromagnetic interference. This dissertation focuses on the development of robust FOSs with ultrahigh sensitivity and their applications in industry and military areas.

Firstly, novel fiber-optic extrinsic Fabry-Perot interferometer (EFPI) inclinometers for one- and two-dimensional tilt measurements with 20 nrad resolution were demonstrated. Compared to in-line fiber optic inclinometers, an extrinsic sensing motif was used in our prototype inclinometer. The variations in tilt angle of the inclinometer was converted into the cavity length changes of the EFPI which can be accurately measured with high resolution. The developed fiber optic inclinometers showed high resolution and great temperature stability in both experiments and practical applications. Secondly, a smart helmet was developed with a single embedded fiber Bragg grating (FBG) sensor for real-time sensing of blunt-force impact events to helmets. The combination of the transient impact data from FBG and the analyses using machine-learning model provides accurate predictions of the magnitudes, the directions and the types of the impact events. The use of the developed smart helmet system can serve as an early-stage intervention strategy for mitigating and managing traumatic brain injuries within the Golden Hour"--Abstract, page iv.


Huang, Jie

Committee Member(s)

Watkins, Steve Eugene, 1960-
Bo, Rui
Esmaeelpour, Mina
Kumar, Aditya


Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering


This project was supported by the Leonard Wood Institute through a Cooperative Agreement with the United States Army Research Laboratory (W911NF-07-2-0062). The authors express their gratitude for the Acute Effects of Neurotrauma Consortium in assisting and coordinating the conduct of the project at Fort Leonard Wood.


Missouri University of Science and Technology

Publication Date

Spring 2021

Journal article titles appearing in thesis/dissertation

  • Probing changes in tilt angle with 20 nanoradian resolution using an extrinsic fabry-perot interferometer-based optical fiber inclinometer
  • A high-resolution two-dimensional fiber optic inclinometer for structural health monitoring applications
  • Fiber optic sensor embedded smart helmet for real-time impact sensing and analysis through machine learning


xi, 97 pages

Note about bibliography

Includes bibliographic references.


© 2021 Yiyang Zhuang, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11863

Electronic OCLC #