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

Yew Li Hor; John F. Federici; Robert L. Wample

doi:10.1364/AO.47.000072

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

Yew Li Hor, John F. Federici, Robert L. Wample

Physics

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

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.

Original language	English (US)
Pages (from-to)	72-78
Number of pages	7
Journal	Applied Optics
Volume	47
Issue number	1
DOIs	https://doi.org/10.1364/AO.47.000072
State	Published - Jan 1 2008

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
Engineering (miscellaneous)
Electrical and Electronic Engineering

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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.",

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AB - 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.

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

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