Date Available

4-12-2011

Year of Publication

2010

Document Type

Thesis

Degree Name

Master of Science in Mechanical Engineering (MSME)

College

Engineering

Department

Mechanical Engineering

Advisor

Dr. Kozo Saito

Abstract

Defects in Aluminum, Stainless steel and galvanized steel sheets are studied in reflection mode infrared thermography. The effect of material properties, surface finish, heating intensity, heater emission spectra, pixel size and defect size are studied. Contrast is governed by heat quality, emissivity and defect geometry—which follows a logarithmic trend. The diameter detected via infrared thermography is found to be at least 30% larger than the measured diameter and sub-pixel defects can be detected. The use of gradient and Laplacian of temperature is introduced as a means of increasing defect contrast and mitigating heater variation.

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