Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

Laureti, Stefano; Khalid Rizwan, Muhammad; Malekmohammadi, Hamed; Burrascano, Pietro; Natali, Maurizio; Torre, Luigi; Rallini, Marco; Puri, Ivan; Hutchins, David; Ricci, Marco

doi:10.3390/s19092198

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Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

Stefano Laureti

^1,*

Muhammad Khalid Rizwan

¹,

²,

²,

²,

²,

and

⁴

Department of Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, Italy

Department of Civil and Environmental Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, Italy

School of Engineering, University of Warwick, Library Road, Coventry CV4 7AL, UK

⁴

Department of Informatics, Modeling, Electronics and System Engineering, University of Calabria, 87036 Rende, Italy

Author to whom correspondence should be addressed.

Sensors 2019, 19(9), 2198; https://doi.org/10.3390/s19092198

Received: 24 April 2019 / Revised: 8 May 2019 / Accepted: 9 May 2019 / Published: 13 May 2019

(This article belongs to the Special Issue Infrared Thermography and Additional Non-Destructive Testing for Building, Structure and Material Inspections)

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Abstract

Ablative materials are used extensively in the aerospace industry for protection against high thermal stresses and temperatures, an example being glass/silicone composites. The extreme conditions faced and the cost-risk related to the production/operating stage of such high-tech materials indicate the importance of detecting any anomaly or defect arising from the manufacturing process. In this paper, two different non-destructive testing techniques, namely active thermography and ultrasonic testing, have been used to detect a delamination in a glass/silicone composite. It is shown that a frequency modulated chirp signal and pulse-compression can successfully be used in active thermography for detecting such a delamination. Moreover, the same type of input signal and post-processing can be used to generate an image using air-coupled ultrasound, and an interesting comparison between the two can be made to further characterise the defect. View Full-Text

Keywords: polymeric ablative materials; thermal protection system; thermography; ultrasonic testing; pulse-compression

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MDPI and ACS Style

Laureti, S.; Khalid Rizwan, M.; Malekmohammadi, H.; Burrascano, P.; Natali, M.; Torre, L.; Rallini, M.; Puri, I.; Hutchins, D.; Ricci, M. Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound. Sensors 2019, 19, 2198. https://doi.org/10.3390/s19092198

AMA Style

Laureti S, Khalid Rizwan M, Malekmohammadi H, Burrascano P, Natali M, Torre L, Rallini M, Puri I, Hutchins D, Ricci M. Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound. Sensors. 2019; 19(9):2198. https://doi.org/10.3390/s19092198

Chicago/Turabian Style

Laureti, Stefano, Muhammad Khalid Rizwan, Hamed Malekmohammadi, Pietro Burrascano, Maurizio Natali, Luigi Torre, Marco Rallini, Ivan Puri, David Hutchins, and Marco Ricci. 2019. "Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound" Sensors 19, no. 9: 2198. https://doi.org/10.3390/s19092198

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Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

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