Quantitative pulsed phase thermography applied to steel plates

Clemente Ibarra-Castanedo; Nicolas P. Avdelidis; Xavier P.V. Maldague

doi:10.1117/12.602360

28 March 2005 Quantitative pulsed phase thermography applied to steel plates

Clemente Ibarra-Castanedo, Nicolas P. Avdelidis, Xavier P.V. Maldague

Proceedings Volume 5782, Thermosense XXVII; (2005) https://doi.org/10.1117/12.602360
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

Pulsed Phase Thermography (PPT) has been proven effective on depth retrieval of flat-bottomed holes in different materials such as plastics and aluminum. In PPT, amplitude and phase delay signatures are available following data acquisition (carried out in a similar way as in classical Pulsed Thermography), by applying a transformation algorithm such as the Fourier Transform (FT) on thermal profiles. The authors have recently presented an extended review on PPT theory, including a new inversion technique for depth retrieval by correlating the depth with the blind frequency f_b (frequency at which a defect produce enough phase contrast to be detected). An automatic defect depth retrieval algorithm had also been proposed, evidencing PPT capabilities as a practical inversion technique. In addition, the use of normalized parameters to account for defect size variation as well as depth retrieval from complex shape composites (GFRP and CFRP) are currently under investigation. In this paper, steel plates containing flat-bottomed holes at different depths (from 1 to 4.5 mm) are tested by quantitative PPT. Least squares regression results show excellent agreement between depth and the inverse square root blind frequency, which can be used for depth inversion. Experimental results on steel plates with simulated corrosion are presented as well. It is worth noting that results are improved by performing PPT on reconstructed (synthetic) rather than on raw thermal data.

Citation Download Citation

Clemente Ibarra-Castanedo, Nicolas P. Avdelidis, and Xavier P.V. Maldague "Quantitative pulsed phase thermography applied to steel plates", Proc. SPIE 5782, Thermosense XXVII, (28 March 2005); https://doi.org/10.1117/12.602360

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available