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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 1 — Jan. 1, 2008
  • pp: 72–78

Nondestructive evaluation of cork enclosures using terahertz∕millimeter wave spectroscopy and imaging

Yew Li Hor, John F. Federici, and Robert L. Wample  »View Author Affiliations


Applied Optics, Vol. 47, Issue 1, pp. 72-78 (2008)
http://dx.doi.org/10.1364/AO.47.000072


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Abstract

Natural cork enclosures, due to their cell structure, composition, and low moisture are fairly transparent to terahertz (THz) and millimeter waves enabling nondestructive evaluation of the cork's surface and interior. It is shown that the attenuation coefficient of the defect-free cork can be modeled with a Mie scattering model in the weakly scattering limit. Contrast in the THz images is a result of enhanced scattering of THz radiation by defects or voids as well as variations in the cork cell structure. The presence of voids, defects, and changes in grain structure can be determined with roughly 100 300   μm resolution.

© 2008 Optical Society of America

OCIS Codes
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(300.6270) Spectroscopy : Spectroscopy, far infrared
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 19, 2007
Manuscript Accepted: October 12, 2007
Published: December 20, 2007

Virtual Issues
Vol. 3, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Yew Li Hor, John F. Federici, and Robert L. Wample, "Nondestructive evaluation of cork enclosures using terahertz/millimeter wave spectroscopy and imaging," Appl. Opt. 47, 72-78 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-1-72

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