Double active transient thermography

Miguel A. Machado*, Maria I. Silva, Ana P. Martins, Marta S. Carvalho, Telmo G. Santos

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
43 Downloads (Pure)


This paper presents an innovative variant of the Active Transient Thermography (ATT), designated Double Active Transient Thermography (DATT), where the component inspected is excited by one heat and one cold sources. The goal is to speed up and improve the temperature contrast, namely for polymer matrix composites parts produced by Additive Manufacturing. Finite element analysis of the thermal phenomena involved in DATT were performed to assist the definition of the experimental set-ups and confirm the high potential of the technique. Experimental results prove that the introduction of the cold flow increases the temperature contrast up to 100%, comparing with ATT, and mid thickness defects are the ones that benefits the most from this technique. Therefore, the improvement of the inspection procedure is achieved by two means: enhancing the thermal contrast of the defects, and/or anticipating the instant when the maximum contrasts occur.

Original languageEnglish
Article number102566
Number of pages9
JournalNDT and E International
Early online date3 Nov 2021
Publication statusPublished - Jan 2022
MoE publication typeA1 Journal article-refereed


  • Active transient thermography
  • DATT
  • Polymer matrix composites
  • Simulation


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