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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 21 — Oct. 13, 2008
  • pp: 17039–17051

Nondestructive evaluation of aircraft composites using transmissive terahertz time domain spectroscopy

Christopher D. Stoik, Matthew J. Bohn, and James L. Blackshire  »View Author Affiliations

Optics Express, Vol. 16, Issue 21, pp. 17039-17051 (2008)

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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.

© 2008 Optical Society of America

OCIS Codes
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(300.6495) Spectroscopy : Spectroscopy, teraherz
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 11, 2008
Revised Manuscript: October 6, 2008
Manuscript Accepted: October 6, 2008
Published: October 10, 2008

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)

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