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Definition of a new thermal contrast and pulse correction for defect quantification in pulsed thermography
- Source :
- Infrared Physics & Technology. 51:160-167
- Publication Year :
- 2008
- Publisher :
- Elsevier BV, 2008.
-
Abstract
- It is well known that the methods of thermographic non-destructive testing based on the thermal contrast are strongly affected by non-uniform heating at the surface. Hence, the results obtained from these methods considerably depend on the chosen reference point. The differential absolute contrast (DAC) method was developed to eliminate the need of determining a reference point that defined the thermal contrast with respect to an ideal sound area. Although, very useful at early times, the DAC accuracy decreases when the heat front approaches the sample rear face. We propose a new DAC version by explicitly introducing the sample thickness using the thermal quadrupoles theory and showing that the new DAC range of validity increases for long times while preserving the validity for short times. This new contrast is used for defect quantification in composite, Plexiglas™ and aluminum samples.
- Subjects :
- Materials science
Observational error
business.industry
media_common.quotation_subject
Condensed Matter Physics
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Pulse (physics)
Optics
Nondestructive testing
Face (geometry)
Thermal
Thermography
Range (statistics)
Contrast (vision)
business
media_common
Subjects
Details
- ISSN :
- 13504495
- Volume :
- 51
- Database :
- OpenAIRE
- Journal :
- Infrared Physics & Technology
- Accession number :
- edsair.doi...........1aeca2f968277519291ef93fdf4ee3a1