Department of Mechanical Engineering, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada
Appl. Sci. 2018, 8(4), 581; https://doi.org/10.3390/app8040581
Received: 31 January 2018 / Revised: 26 March 2018 / Accepted: 4 April 2018 / Published: 8 April 2018
(This article belongs to the Special Issue Recent Advances and Applications of Infrared Thermography)
Conventional infrared thermography techniques, including pulsed and lock-in thermography, have shown great potential for non-destructive evaluation of broad spectrum of materials, spanning from metals to polymers to biological tissues. However, performance of these techniques is often limited due to the diffuse nature of thermal wave fields, resulting in an inherent compromise between inspection depth and depth resolution. Recently, matched-filter thermography has been introduced as a means for overcoming this classic limitation to enable depth-resolved subsurface thermal imaging and improving axial/depth resolution. This paper reviews the basic principles and experimental results of matched-filter thermography: first, mathematical and signal processing concepts related to matched-fileting and pulse compression are discussed. Next, theoretical modeling of thermal-wave responses to matched-filter thermography using two categories of pulse compression techniques (linear frequency modulation and binary phase coding) are reviewed. Key experimental results from literature demonstrating the maintenance of axial resolution while inspecting deep into opaque and turbid media are also presented and discussed. Finally, the concept of thermal coherence tomography for deconvolution of thermal responses of axially superposed sources and creation of depth-selective images in a diffusion-wave field is reviewed. View Full-Text
Keywords: thermography; matched filtering; thermal-wave radar; thermal coherence tomography; photothermal coherence tomography; thermal waves; photothermal radiometry►▼ Show Figures
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Tabatabaei, N. Matched-Filter Thermography. Appl. Sci. 2018, 8, 581.
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Tabatabaei N. Matched-Filter Thermography. Applied Sciences. 2018; 8(4):581.Chicago/Turabian Style
Tabatabaei, Nima. 2018. "Matched-Filter Thermography." Appl. Sci. 8, no. 4: 581.
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