Doctoral Dissertations

Author

Ali Foudazi

Keywords and Phrases

Microwave; Microwave Thermography; NDT; Nondestructive testing; Thermography

Abstract

"Active Microwave Thermography (AMT) is an integrated nondestructive testing and evaluation (NDT&E) method that incorporates aspects of microwave NDT and thermography techniques. AMT uses a microwave excitation to generate heat and the surface thermal profile of the material or structure under test is subsequently measured using a thermal camera (or IR camera). Utilizing a microwave heat excitation provides advantages over traditional thermal excitations (heat lamps, etc.) including the potential for non-contact, selective and focused heating. During an AMT inspection, two heating mechanisms are possible, referred to as dielectric and induction heating. Dielectric heating occurs as a result of the interaction of microwave energy with lossy dielectric materials which results in dissipated microwave energy and a subsequent increase in temperature. Induction heating is a result of induced surface current on conductive materials with finite conductivity under microwave illumination and subsequently ohmic loss. Due to the unique properties of microwave signals including frequency of operation, power level, and polarization, as well as their interaction with different materials, AMT has strong potential for application in various industries including infrastructure, transportation, aerospace, etc. As such, this Dissertation explores the application of AMT to NDT&E needs in these important industries, including detection and evaluation of defects in single- or multi-layered fiber-reinforced polymer-strengthened cement-based materials, evaluation of steel fiber percentage and distributions in steel fiber reinforced structures, characterization of corrosion ratio on corroded reinforcing steel bars (rebar), and evaluation of covered surface cracks orientation and size in metal structures"--Abstract, page iv.

Advisor(s)

Donnell, Kristen M.

Committee Member(s)

Zoughi, R.
Pommerenke, David
Fan, Jun, 1971-
Chandrashekhara, K.

Department(s)

Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering

Sponsor(s)

American Society for Nondestructive Testing
IEEE Instrumentation and Measurement Society
Missouri University of Science and Technology. Center for Infrastructure Engineering Studies
National Science Foundation (U.S.)

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2017

Journal article titles appearing in thesis/dissertation

  • Active microwave thermography for defect detection of CFRP-strengthened cement-based materials
  • Active microwave thermography for nondestructive evaluation of FRP-rehabilitated cement-based structures
  • Evaluation of steel fiber distribution in cement-based mortars using active microwave thermography
  • Characterization of corroded reinforced steel bars by active microwave thermography
  • Active microwave thermography for nondestructive evaluation of surface cracks in metal structures

Pagination

xiv, 129 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2017 Ali Foudazi, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11220

Electronic OCLC #

1021857520

Comments

Financial support of National Science Foundation (U.S.) 1609470

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