Low Thermal Conductivity Materials and Very Low Heat Power: A Demanding Challenge in the Detection of Flaws in Multi-Layer Wooden Cultural Heritage Objects Solved by Pulse-Compression Thermography Technique
Abstract
:1. Introduction
2. Pulse-Compression Thermography (PuCT)
- (1)
- The sample is excited via a periodic (two periods) Legendre sequence-modulated heating stimulus of order 31, each bit having a duration of 1 s, leading to an overall duration of the stimuli T = 62 s;
- (2)
- Thermograms are acquired for an overall time interval T;
- (3)
- The step-heating removal procedure (Fitting) is applied pixelwise to the of the acquired thermogram sequence for obtaining ;
- (4)
- The PuC algorithm is performed by convolving only the second period of with , thus retrieving , as for Equation (2). Note that is just the time reversal of a single period of the periodic Legendre sequence.
3. Material and Methods
3.1. Sample Realization
3.2. Experimental Setups
4. Discussion
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Sfarra, S.; Laureti, S.; Gargiulo, G.; Malekmohammadi, H.; Sangiovanni, M.A.; La Russa, M.; Burrascano, P.; Ricci, M. Low Thermal Conductivity Materials and Very Low Heat Power: A Demanding Challenge in the Detection of Flaws in Multi-Layer Wooden Cultural Heritage Objects Solved by Pulse-Compression Thermography Technique. Appl. Sci. 2020, 10, 4233. https://doi.org/10.3390/app10124233
Sfarra S, Laureti S, Gargiulo G, Malekmohammadi H, Sangiovanni MA, La Russa M, Burrascano P, Ricci M. Low Thermal Conductivity Materials and Very Low Heat Power: A Demanding Challenge in the Detection of Flaws in Multi-Layer Wooden Cultural Heritage Objects Solved by Pulse-Compression Thermography Technique. Applied Sciences. 2020; 10(12):4233. https://doi.org/10.3390/app10124233
Chicago/Turabian StyleSfarra, Stefano, Stefano Laureti, Gianfranco Gargiulo, Hamed Malekmohammadi, Mario Andrea Sangiovanni, Mauro La Russa, Pietro Burrascano, and Marco Ricci. 2020. "Low Thermal Conductivity Materials and Very Low Heat Power: A Demanding Challenge in the Detection of Flaws in Multi-Layer Wooden Cultural Heritage Objects Solved by Pulse-Compression Thermography Technique" Applied Sciences 10, no. 12: 4233. https://doi.org/10.3390/app10124233