Compensation-Based Full-Filed Thermal Homogenization for Contrast Enhancement in Long Pulse Thermographic Imaging
Yoonjae Chung, Chunyoung Kim, Seongmin Kang, Wontae Kim, Hyunkyu Suh
TL;DR
This paper introduces a new thermographic technique using halogen lamps and compensation methods to improve defect detection in industrial materials.
Contribution
The novel contribution is the development of ATC and TRC compensation methods for enhancing thermal contrast in long pulse thermography.
Findings
The proposed technique achieved up to 42 dB SNR improvement for severe subsurface defects.
A quantitative evaluation method using SNR-based models was developed for accurate defect depth estimation.
The approach simplifies defect assessment by eliminating complex amplitude and phase transformations.
Abstract
Non-destructive testing (NDT) plays a crucial role in ensuring the structural integrity and safety of industrial facilities and components. Long pulse thermography (LPT), a form of active thermographic testing (ATT), has gained attention for its ability to detect subsurface defects efficiently. However, non-uniform thermal excitation and environmental noise often degrade the accuracy of defect detection. This study proposes an advanced thermographic inspection technique incorporating a halogen array (HA) lamp and a compensation methodology to enhance the reliability of defect detection. Two compensation methods, namely absolute temperature compensation (ATC) and temperature rate compensation (TRC), were developed to correct non-uniform thermal loads and improve the defect contrast. Experimental validation was conducted on A-type and B-type mock-up specimens with artificial subsurface…
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Taxonomy
TopicsThermography and Photoacoustic Techniques · Infrared Thermography in Medicine · Photoacoustic and Ultrasonic Imaging