Dual-band infrared imaging to detect corrosion damage within airframes and concrete structures
- Lawrence Livermore National Lab., CA (United States)
The authors are developing dual-band infrared (DBIR) imaging and detection techniques to inspect airframes and concrete bridge decks for hidden corrosion damage. Using selective DBIR image ratios, they enhanced surface temperature contrast and removed surface emissivity noise associated with clutter. The surface temperature maps depicted defect sites, which heat and cool at different rates than their surroundings. The emissivity-ratio maps tagged and removed the masking effects of surface clutter. For airframe inspections, the authors used time-resolved DBIR temperature, emissivity-ratio and composite thermal inertia maps to locate corrosion-thinning effects within a flash-heated Boeing 737 airframe. Emissivity-ratio maps tagged and removed clutter sites from uneven paint, dirt and surface markers. Temperature and thermal inertia maps characterized defect sites, types, sizes, thicknesses, thermal properties and material-loss effects from airframe corrosion. For concrete inspections, they mapped DBIR temperature and emissivity-ratio patterns to better interpret surrogate delamination sites within naturally-heated, concrete slabs and removed the clutter mask from sand pile-up, grease stains, rocks and other surface objects.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 220713
- Report Number(s):
- CONF-940449-; ISBN 0-8194-1549-9; TRN: IM9620%%107
- Resource Relation:
- Conference: Society of Photo-Optical Instrumentation Engineers conference on intelligent information systems, Orlando, FL (United States), 4-8 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Thermosense 16: An international conference on thermal sensing and imaging diagnostic applications; Snell, J.R. Jr. [ed.]; PB: 330 p.; Proceedings/SPIE, Volume 2245
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dual-band infrared (DBIR) imaging inspections of Boeing 737 and KC-135 aircraft panels
Dynamic thermal tomography for nondestructive inspection of aging aircraft