Enhanced humidity detection in multilayer components by passive multivariate infrared thermography

Marcos Souza; Fernando Lopez; Xavier Maldague

doi:10.1117/12.2615802

13 June 2022 Enhanced humidity detection in multilayer components by passive multivariate infrared thermography

Marcos Souza, Fernando Lopez, Xavier Maldague

Proceedings Volume PC12109, Thermosense: Thermal Infrared Applications XLIV; (2022) https://doi.org/10.1117/12.2615802
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

Trapped humidity is a deleterious condition in several industrial sectors. Beyond reducing performance in process industry, it can create or accelerate structural damage mechanisms like corrosion, where thermally insulated equipment are the main concerning structures. Underneath the insulation, the corrosion evolves invisible at uncontrolled rates until leakage or more catastrophic failure occurs. The aim of this work is then to establish a passive thermographic technique to be deployed in such environments that can reliably detect trapped humidity. The Multivariate Thermography, based on the Partial Least-Squares regression, can efficiently separate indications from different physical phenomena and drastically reduce the effect of surface finish on the detectability. Preliminary results are encouraging to potentially extend the applicability of thermography to considerably low levels of surface emissivity and reduce the incidence of false positives in thermographic inspection.

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Marcos Souza, Fernando Lopez, and Xavier Maldague "Enhanced humidity detection in multilayer components by passive multivariate infrared thermography", Proc. SPIE PC12109, Thermosense: Thermal Infrared Applications XLIV, (13 June 2022); https://doi.org/10.1117/12.2615802

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KEYWORDS

Humidity

Thermography

Corrosion

Inspection

Data acquisition

Inspection equipment

Physical phenomena

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