Journal ArticleDOI
Theory of frequency modulated thermal wave imaging for nondestructive subsurface defect detection
Ravibabu Mulaveesala,Suneet Tuli +1 more
TLDR
In this paper, the authors provided the theory and mathematical analysis in support of a recently proposed frequency modulated thermal wave imaging for nondestructive subsurface defect detection in solids.Abstract:
This letter provides the theory and mathematical analysis in support of a recently proposed frequency modulated thermal wave imaging for nondestructive subsurface defect detection in solids. The authors illustrate how the technique simultaneously combines the advantages of both conventional pulse based thermography as well as modulated lock-in thermography. A specimen is heated for launching thermal waves into the sample, not at a single frequency (lock-in) or at all frequencies (pulse), but in a desired range of frequencies. While peak power requirement is reduced, phase images obtained retain known advantages. Experimental results from a carbon fiber reinforced plastic sample are presented in support.read more
Citations
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Journal ArticleDOI
Recent Advances in Active Infrared Thermography for Non-Destructive Testing of Aerospace Components.
TL;DR: This review provides an exhaustive summary of most recent active thermographic methods used for aerospace applications according to their physical principle and thermal excitation sources.
Journal ArticleDOI
Optically and non-optically excited thermography for composites: A review
Ruizhen Yang,Yunze He +1 more
TL;DR: In this paper, a comprehensive review of thermography NDT techniques for composites inspection was conducted based on an orderly and concise literature survey and detailed analysis, and some research trends were predicted.
Journal ArticleDOI
Surface Crack Detection for Carbon Fiber Reinforced Plastic (CFRP) Materials Using Pulsed Eddy Current Thermography
Liang Cheng,Gui Yun Tian +1 more
TL;DR: In this article, a PEC thermography inspection system for carbon fiber reinforced plastic (CFRP) materials is studied and optimized, and the authors show that PEC can be used for defect detection and characterization through analysis of the surface heating pattern and the transient temperature change.
Journal ArticleDOI
A comparison of the pulsed, lock-in and frequency modulated thermography nondestructive evaluation techniques
TL;DR: Pulsed, lock-in and frequency modulated thermography are three alternative nondestructive evaluation techniques. as discussed by the authors compared the defect imaging performance of these techniques using: matched excitation energy; the same carbon fiber composite test piece and infrared camera system.
Journal ArticleDOI
Pulse compression approach to infrared nondestructive characterization
TL;DR: The technique of pulse compression offers a means of increasing the average power available to illuminate test specimen without any loss of the depth resolution needed for the tactical requirements.
References
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Book
Conduction of Heat in Solids
H. S. Carslaw,John Conrad Jaeger +1 more
TL;DR: In this paper, a classic account describes the known exact solutions of problems of heat flow, with detailed discussion of all the most important boundary value problems, including boundary value maximization.
Book
Theory and Practice of Infrared Technology for Nondestructive Testing
TL;DR: In this paper, the authors present an active and passive approach to active thermography for nondestructive testing of infrared sensors and Optic Fundamentals using Matlab M-Scripts.
Journal ArticleDOI
Pulse phase infrared thermography
Xavier Maldague,Sergio Marinetti +1 more
TL;DR: In this article, an approach combining both of pulse (PT) and modulated infrared thermography is proposed which combines simultaneously advantages both of PT and MODI, and the results are presented and the theory is discussed as well.
Journal ArticleDOI
Lock-in thermography for nondestructive evaluation of materials
Datong Wu,Gerd Busse +1 more
TL;DR: In this paper, the phase sensitive modulation thermography (or "lock-in thermography") combines the advantages of photothermal radiometry with the fast technique of infrared imaging thereby revealing hidden defects in a short time.
Journal ArticleDOI
Defect detection by pulse compression in frequency modulated thermal wave imaging
Suneet Tuli,Ravibabu Mulaveesala +1 more
TL;DR: In this paper, a new, quantitative, whole field, non-contact and non-destructive technique for sub-surface defect detection is presented based on frequency modulated thermal wave imaging (FMTWI).