Water ingress detection in honeycomb sandwich panels by passive infrared thermography using a high-resolution thermal imaging camera

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DOIResolve DOI: http://doi.org/10.1117/12.918567
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Proceedings titleThermosense: Thermal Infrared Applications XXXIV
Proceedings of SPIE
ConferenceThermosense: Thermal Infrared Applications XXXIV, April 23-26, 2012, Baltimore, MD, USA
ISSN0277-786X
ISBN9780819490322
Volume8354
Article number835405
SubjectAircraft structure; Atmospheric conditions; Composite layer; Core area; De-icing agents; High resolution; Honeycomb sandwich panels; Honeycomb sandwich structure; Infra-red cameras; Mid wave infrared (MWIR); Military aerospace industry; Moisture ingress; Presence of water; Pressure and temperature; Thermal imaging cameras; Water ingress detection; Aerospace industry; Aircraft manufacture; Airframes; Diffusion in liquids; Honeycomb structures; Infrared devices; Infrared radiation; Landing; Nanocomposite films; Sandwich structures; Temperature indicating cameras; Vapors; Thermography (imaging)
AbstractWater ingress in honeycomb structures is of great concern for the civil and military aerospace industries. Pressure and temperature variations during take-off and landing produce considerable stress on aircraft structures, promoting moisture ingress (by diffusion through fibers or by direct ingress through voids, cracks or unsealed joints) into the core. The presence of water (or other fluids such as kerosene, hydraulic fluid and de-icing agents) in any of its forms (gas vapor, liquid or ice) promotes corrosion, cell breakage, and induce composite layer delaminations and skin disbonds. In this study, testing specimens were produced from unserviceable parts from military aircraft. In order to simulate atmospheric conditions during landing, selected core areas were filled with measured quantities of water and then frozen in a cold chamber. The specimens were then removed from the chamber and monitored for over 20 minutes as they warm up using a cooled high-resolution infrared camera. Results have shown that detection and quantification of water ingress on honeycomb sandwich structures by passive infrared thermography is possible using a HD mid-wave infrared cameras for volumes of water as low as 0.2 ml and from a distance as far as 20 m from the target.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21270179
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Record identifierfa5813f6-7179-45c9-8dba-9b51756940f4
Record created2014-01-08
Record modified2016-05-09
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