Reconstruction and enhancement of thermographic sequence data

Steven M. Shepard; D. Wang; James R. Lhota; Bruce A. Rubadeux; Tasdiq Ahmed

doi:10.1117/12.470711

18 June 2002 Reconstruction and enhancement of thermographic sequence data

Steven M. Shepard, D. Wang, James R. Lhota, Bruce A. Rubadeux, Tasdiq Ahmed

Proceedings Volume 4704, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures; (2002) https://doi.org/10.1117/12.470711
Event: NDE For Health Monitoring and Diagnostics, 2002, San Diego, California, United States

Abstract

Conventional methods for analysis of pulsed thermographic NDE sequence data are highly susceptible to noise, nonlinearity of the IR camera response, and the presence of surface features on the sample. Furthermore, the ability of conventional methods to significantly improve the ability to retrieve deep or weak subsurface features beyond the original unmodified image is limited. We have developed a Thermographic Signal Reconstruction (TSR) technique that enhances defect to background contrast, increases the depth range over which pulsed thermography can be applied, and reduces the amount of blurring due to lateral diffusion that is typical of thermographic imaging. The TSR approach also reduces the amount of data that must be stored by an order of magnitude. The reduction in size of the data structure allows simultaneous manipulation of data from numerous locations on a sample, so that fast parallel processing of large structure data is possible. The results of the parallel processed TSR data consistently offer higher spatial resolution, less blurring and more precise depth and size measurement than the original data. Examples on aircraft and power generation components will be presented.

Citation Download Citation

Steven M. Shepard, D. Wang, James R. Lhota, Bruce A. Rubadeux, and Tasdiq Ahmed "Reconstruction and enhancement of thermographic sequence data", Proc. SPIE 4704, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures, (18 June 2002); https://doi.org/10.1117/12.470711

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