Nondestructive Evaluation of Aircraft Composites Using Transmissive Terahertz Time Domain Spectroscopy
Document Type
Article
Publication Date
10-13-2008
Abstract
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.
Source Publication
Optics Express
Recommended Citation
Christopher D. Stoik, Matthew J. Bohn, and James L. Blackshire, "Nondestructive evaluation of aircraft composites using transmissive terahertz time domain spectroscopy," Opt. Express 16, 17039-17051 (2008).
Comments
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[*] Author C. Stoik was an AFIT PhD candidate at the time of publication.