Asee peer logo

Analyzing Porosity in Thermal Barrier Coatings: Edge Detection of Images Using MATLAB

Download Paper |


2014 ASEE Annual Conference & Exposition


Indianapolis, Indiana

Publication Date

June 15, 2014

Start Date

June 15, 2014

End Date

June 18, 2014



Conference Session

Use of Technology for Education

Tagged Division


Page Count


Page Numbers

24.185.1 - 24.185.12

Permanent URL

Download Count


Request a correction

Paper Authors

author page

Derrick Robinson Virginia State University


Pallant Ramsundar Virginia State University

visit author page

Dr. Pallant Ramsundar is a Research Professor at the Virginia State University based at the the Commonwealth Center for Advanced Manufacturing (CCAM) in Virginia. Dr. Ramsundar holds a doctorate from the University of Cambridge in Rapid Manufacturing and has extensive industrial experience in manufacturing. Dr. Ramsundar's research interests are in additive manufacture, Nano and micro manufacturing, CAD/CAM and Product Design and Development.

visit author page


Chandan B Samantaray Virginia State University

visit author page

Dr. Chandan B. Samantaray, has been working as Assistant Professor of Physics in the Department of Chemistry & Physics, Virginia State University. He has almost fifteen years of active research in the fields of ceramic thin films/coating, semiconductor devices & process, and modeling. His interests include advanced manufacturing, nanosensors, and finite element simulation.

visit author page

Download Paper |


Evaluation of various edge detection methods in MATLAB for determining porosity in thermal barrier coatings Derrick Robinson1, and P. Ramsundar2, 4 , C. B. Samantaray3, 4 * 1 Department of Computer Engineering, Virginia State University, Petersburg, VA 2 Departments of Mathematics & Computer Science, Virginia State University, Petersburg, VA 3 Department of Chemistry & Physics, Virginia State University, Petersburg, VA 4 Commonwealth Center for Advanced Manufacturing (CCAM), Disputanta, VAThermal spray has been widely used in aerospace and manufacturing industries with a variety ofapplications, especially for coating technology. Methods such as air plasma spray and electronbeam physical vapor deposition are used for thermal barrier coatings (TBC) applied to turbines,machinery parts and tools. The process-structure-property correlations to the coating technologyare very important for achieving lifetime durability and sustainability [1, 2]. An importantmeasure of coating integrity is the porosity of the surface structure [3]. Traditionally porosity ofthe deposit is obtained by microscopy of surface sections and use of software to assess theporosity based on a manual grayscale setting. As a result porosity results on surface coatings arehighly subjective.This paper evaluates six edge detection methods in MATLAB for determining porositymeasurement on a test image of a thermal barrier coating.References1. S. Sampath, V. Srinivasan, A. Valarezo, A. Vaidya, and T. Streibl, “Sensing, Control, and In Situ Measurement of Coating Properties: An Integrated Approach Toward Establishing Process-Property Correlations”, Journal of Thermal Spray Technology, 18 (2009) p. 243.2. W. Chi and S. Sampath, “Microstructure–Thermal Conductivity Relationships for Plasma-Sprayed Yttria-Stabilized Zirconia Coatings”, J. Am. Ceram. Soc., 91 (2008) p.2636.3. A. Portinhaa, V. Teixeiraa, J. Carneiroa, J. Martinsb, M. F. Costac, R. Vassend, and D. Stoeverd, “Characterization of thermal barrier coatings with a gradient in porosity”, Surface & Coatings Technology, 195 (2005) p. 245.* Corresponding email:

ASEE holds the copyright on this document. It may be read by the public free of charge. Authors may archive their work on personal websites or in institutional repositories with the following citation: © 2014 American Society for Engineering Education. Other scholars may excerpt or quote from these materials with the same citation. When excerpting or quoting from Conference Proceedings, authors should, in addition to noting the ASEE copyright, list all the original authors and their institutions and name the host city of the conference. - Last updated April 1, 2015