Nondestructive evaluation of aircraft composites using transmissive terahertz time domain spectroscopy

Terahertz time domain spectroscopy (TDS) was assessed as a nondestructive evaluation technique for aircraft composites. Damage to glass fiber was studied including voids, delaminations, mechanical damage, and heat damage. Measurement of the material properties on samples with localized heat damage s...

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Bibliographic Details
Published in:Optics express 2008-10, Vol.16 (21), p.17039-17051
Main Authors: Stoik, Christopher D, Bohn, Matthew J, Blackshire, James L
Format: Article
Language:English
Subjects:
Aircraft
Algorithms
Manufactured Materials - analysis
Materials Testing - methods
Spectrophotometry, Infrared - methods
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Summary:Terahertz time domain spectroscopy (TDS) was assessed as a nondestructive evaluation technique for aircraft composites. Damage to glass fiber was studied including voids, delaminations, mechanical damage, and heat damage. Measurement of the material properties on samples with localized heat damage showed that burning did not change the refractive index or absorption coefficient noticeably; however, material blistering was detected. Voids were located by TDS transmissive imaging using amplitude and phase techniques. The depth of delaminations was measured via the timing of Fabry-Perot reflections after the main pulse. Evidence of bending stress damage and simulated hidden cracks was also detected with terahertz imaging.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.16.017039