Analytical modeling of flash thermography: results for a layered sample

Matthias Goldammer; Joachim Baumann

doi:10.1117/12.469625

7 June 2002 Analytical modeling of flash thermography: results for a layered sample

Matthias Goldammer, Joachim Baumann

Proceedings Volume 4703, Nondestructive Evaluation and Reliability of Micro- and Nanomaterial Systems; (2002) https://doi.org/10.1117/12.469625
Event: NDE For Health Monitoring and Diagnostics, 2002, San Diego, California, United States

Abstract

For a long time quantitative data analysis for nondestructive evaluation of material properties with flash thermography meant a simple comparison of the measured temperature to a standard at a fixed time after excitation. With the advent of modern infrared camera technology a few improved concepts for extracting measurement data were developed, but no testing technique used for industrial applications took advantage of the physical properties of thermal diffusion. We present an analytical 1-dimensional model for a multi-layer sample that predicts the time evolution of the surface temperature after excitation. Based on an experimentally confirmed model for thermography with periodic excitation, this calculation tool permits to determine parameters like layer thickness or heat conductivity taking into account the complete data set instead of a single image. For samples with a geometry and thermal properties specified before measuring, an unknown parameter could be extracted from experimental data without further calibration standards. The model is also capable of accommodating arbitrary excitation and semitransparent layers. We present calculations of different test scenarios like layer thickness measurement. Finally, we compare the model calculation to test samples with known characteristics.

Citation Download Citation

Matthias Goldammer and Joachim Baumann "Analytical modeling of flash thermography: results for a layered sample", Proc. SPIE 4703, Nondestructive Evaluation and Reliability of Micro- and Nanomaterial Systems, (7 June 2002); https://doi.org/10.1117/12.469625

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