Masters Theses


"This thesis is comprised of two papers and they describe distributed fiber optic sensing using an optical frequency domain reflectometry (OFDR) instrumentation system.

The first paper presents about distributed fiber optic sensor embedded within the layers of a composite laminates to monitor the continuous profile of strain using the optical frequency domain reflectometry (OFDR) system. The OFDR system was used to analyze the Rayleigh backscattered signal. The shift in the Rayleigh backscattered spectrum (RBS) was observed to be linearly related to the change in strain of the composite material. The continuous strain sensing using OFDR was demonstrated by an INSTRON tensile testing system and cantilever beam experiment. The results shows a good strain transfer between the composite laminate and the optical fiber with no slipping or hysteresis issues.

The second paper of the thesis proposes and demonstrates the distributed refractive index sensing by a macrobending single mode fiber (SMF) and the OFDR system. The macro-bending fiber is fabricated by bending a piece of SMF to a particular radius of curvature in several millimeters. The refractive index (RI) of the external medium surrounding the macrobending fiber is measured by the RBS shift using OFDR system. RI is measured from the range of 1.3348 to 1.3557 using the proposed method in our experiment. This sensor can also be used to detect multipoint RIs simultaneously verifying the capability of distributed sensing"--Abstract, page iv.


Huang, Jie

Committee Member(s)

Watkins, Steve Eugene, 1960-
Ferguson, Ian T.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


University of Missouri Research Board
Missouri University of Science and Technology. Materials Research Center
Missouri University of Science and Technology. Intelligent Systems Center


The work was supported by University of Missouri Research Board, Materials Research Center at Missouri S&T, and the ISC center Post-Doc Matching funds at Missouri S&T.

Research Center/Lab(s)

Intelligent Systems Center


Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Spatially continous strain monitoring of carbon fiber composites using embedded distributed fiber optic sensors
  • Rayleigh backscattering based macrobending single mode fiber for distributed refractive index sensing


ix, 36 pages

Note about bibliography

Includes bibliographical references.


© 2018 Sasi Jothibasu, All rights reserved.

Document Type

Thesis - Open Access

File Type




Thesis Number

T 11490

Electronic OCLC #