Improvement of crack detection on rough materials by digital holographic interferometry in combination with non-uniform thermal loads

The aim of this work is to present an experimental procedure to improve crack detection in rough surfaces by means of lensless Fourier digital holographic interferometry (DHI). To overcome the problem of analyzing high speckle interferograms that blurs phase maps and hinders, or even prevents, crack...

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Bibliographic Details
Published inOptik (Stuttgart) Vol. 163; pp. 43 - 48
Main Authors Vincitorio, F., Bahuer, L., Fiorucci, M.P., López, A.J., Ramil, A.
Format Journal Article
LanguageEnglish
Published Elsevier GmbH 01.06.2018
Subjects
Crack investigation
DHI
Digital holography
Non-uniform heating
Rough surfaces
Unwrapping phase maps
Digital holography
Crack investigation
Rough surfaces
DHI
Unwrapping phase maps
Non-uniform heating
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Summary:The aim of this work is to present an experimental procedure to improve crack detection in rough surfaces by means of lensless Fourier digital holographic interferometry (DHI). To overcome the problem of analyzing high speckle interferograms that blurs phase maps and hinders, or even prevents, crack detection, it is proposed the application of a non-uniform thermal load to the object under study, as excitation source, instead of the most common uniform heating. Different tests with mock ups of cracks of controlled width allowed us to demonstrate the effect of a non-uniform thermal load, and confirmed the enhancement in DHI information, especially in unwrapping phase maps. Finally, DHI was applied to the detection of a crack in a cast iron sample and the results obtained with both uniform and non-uniform heating procedures were compared and the improvement attained by means of non-uniform heating was confirmed.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2018.02.068