Location
Brunswick, ME
Start Date
1-1-1992 12:00 AM
Description
The purpose of this study is to improve the quality of thermal wave infrared (IR) images in terms of the real shape of the defect. Due to heat diffusion into the sample, thermal wave images are usually blurred, especially for deep defects or long times. Because of this feature the use of traditional image post-processing (gradient image, threshold…) to assess the size and the shape of the defect quite often leads to false results. In order to increase the accuracy in the shape recovery, we need to “unblur” the thermal wave image, i.e. to reverse or invert the blurring process. To do so, our approach is to model the physical process such that a space description of the defect is involved parametrically and from that model to invert the image.
Book Title
Review of Progress in Quantitative Nondestructive Evaluation
Volume
11A
Chapter
Chapter 1: Fundamentals of Standard Techniques
Section
Thermal Techniques
Pages
417-423
DOI
10.1007/978-1-4615-3344-3_52
Copyright Owner
Springer-Verlag US
Copyright Date
January 1992
Language
en
File Format
application/pdf
Analytic Calculations and Numerical Simulations of Box-Car Thermal Wave Images of Planar Subsurface Scatterers
Brunswick, ME
The purpose of this study is to improve the quality of thermal wave infrared (IR) images in terms of the real shape of the defect. Due to heat diffusion into the sample, thermal wave images are usually blurred, especially for deep defects or long times. Because of this feature the use of traditional image post-processing (gradient image, threshold…) to assess the size and the shape of the defect quite often leads to false results. In order to increase the accuracy in the shape recovery, we need to “unblur” the thermal wave image, i.e. to reverse or invert the blurring process. To do so, our approach is to model the physical process such that a space description of the defect is involved parametrically and from that model to invert the image.
