2007
DOI: 10.1364/ao.47.000072
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Nondestructive evaluation of cork enclosures using terahertz/millimeter wave spectroscopy and imaging

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 … Show more

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Cited by 60 publications
(37 citation statements)
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“…Their structure, and low moisture content are reasonably transparent to terahertz (THz). Nondestructive evaluation of the cork's surface and interior has been done [115] and the 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 as shown in figure 3 extracted from [115].…”
Section: Food Industrymentioning
confidence: 99%
“…Their structure, and low moisture content are reasonably transparent to terahertz (THz). Nondestructive evaluation of the cork's surface and interior has been done [115] and the 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 as shown in figure 3 extracted from [115].…”
Section: Food Industrymentioning
confidence: 99%
“…Brunetti et al (2002) applied Compton tomography in the study of cork stopper density to refine the visual classification. Hor et al (2008) evaluated and imaged natural cork by means of terahertz spectroscopy. Donepudi et al (2010) visualised images of cork stoppers with a novel imaging technology, called diffraction-enhanced imaging.…”
Section: Introductionmentioning
confidence: 99%
“…Otras técnicas aplicadas a la clasificación de los tapones son la tomografía Compton basada en los rayos X (Brunetti et al 2002), la resonancia magnética nuclear en estado líquido 1 H MAS -NMR (Gil et al 1997) y en estado sólido 13 C-NMR (Hor et al 2008, Neto et al 1995, Pereira 2007) y la espectroscopía de infrarrojo medio FT-IR (Marques et al 1994, Pereira 2007. Las técnicas 13 C-NMR y FT-IR se han aplicado de forma combinada (Lopes et al 2001) y recientemente el análisis de imagen se ha combinado con la espectroscopía de ondas en terahertz/ milímetros para la evaluación no destructiva de tapones de corcho (Hor et al 2008).…”
Section: Introductionunclassified
“…Las técnicas 13 C-NMR y FT-IR se han aplicado de forma combinada (Lopes et al 2001) y recientemente el análisis de imagen se ha combinado con la espectroscopía de ondas en terahertz/ milímetros para la evaluación no destructiva de tapones de corcho (Hor et al 2008). …”
Section: Introductionunclassified