Optimizing thermography depth probing with a dynamic thermal point spread function |
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Institution: | 1. Faculty of Civil Engineering, Hydraulics Division, Istanbul Technical Univ., Maslak 34469, Istanbul, Turkey;2. Faculty of Civil Engineering, Environmental Engineering Division, Istanbul Technical Univ., Maslak 34469, Istanbul, Turkey;1. Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany;2. DB Systemtechnik GmbH, Bahntechnikerring 74, 14774 Brandenburg-Kirchmöser, Germany |
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Abstract: | Derivation of two point spread functions PSFs suitable for infrared thermograms analysis is illustrated, based on two unique approaches, one based on depth decaying limit and one on diffusion limit. Experimental work using PMMA sample with back drilled holes and pulsed thermographic routine is utilized to show the effectiveness of deconvoluting pixel temperature transient history with suggested PSF’s. Synthetic second time derivative thermograms are utilized for comparison and the signal to noise ratio is used as a figure of merit for quantification. |
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