Terahertz time-domain spectroscopy of wheat grain

Chua, Hong Siang; Upadhya, P. C.; Haigh, Arthur; Obradovic, Jelena; Gibson, Arthur; Linfield, Edmund H.

doi:10.1109/icimw.2004.1422130

Cited by 13 publications

(8 citation statements)

References 5 publications

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“…Terahertz spectroscopy was applied for moisture measurement in whole wheat grain and crushed wheat grain by Chua et al (55,56). Polytetrafluoroethylene was selected as sample holder for the crushed wheat.…”

Section: Applicationsmentioning

confidence: 99%

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The Detection of Agricultural Products and Food Using Terahertz Spectroscopy: A Review

Qin

Ying

Xie

2013

Applied Spectroscopy Reviews

125

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Demand for high levels of quality and safety in agricultural products and food requires appropriate analytical techniques for analysis both during and after production. Desirable techniques should be quick, easy, and safe to use; require minimal or no sample preparation; avoid sample destruction; and be accurate. In this study, the recent technical applications of terahertz spectroscopy to identify and classify, qualitatively and quantitatively analyze, evaluate, and safely control agricultural products and food are reviewed. The challenges and future outlook of terahertz spectroscopy are discussed.

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Section: Applicationsmentioning

confidence: 99%

“…Another challenge of terahertz spectroscopy is the scattering effects, especially for irregular granular samples (55). To reduce the scattering effects, the sample is ground into powder and then compressed into a smooth pellet.…”

Section: Challengesmentioning

confidence: 99%

The Detection of Agricultural Products and Food Using Terahertz Spectroscopy: A Review

Qin

Ying

Xie

2013

Applied Spectroscopy Reviews

125

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“…As THz technology has developed over the past 20 years, THz spectroscopy and imaging has been applied to a wider variety of materials, including food [6] and agricultural products. Agriculture applications include measuring the moisture content in leaves [7,8], density inhomogeneities and structural details of wood [9,10], grain [11,12], and the presence of defects and voids in natural cork [13].…”

Section: Introductionmentioning

confidence: 99%

Application of terahertz Gouy phase shift from curved surfaces for estimation of crop yield

et al. 2009

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The application of terahertz time-domain spectroscopy (THz-TDS) and imaging to differentiate flat and curved surfaces in reflection via the THz Gouy phase shift is demonstrated. For a THz-TDS system that is aligned for reflection from a flat surface, the presence of a curved surface displaces the image focal plane from the detector plane, resulting in a Gouy phase shift. The potential of utilizing this configuration for estimating the number and size of curved objects is discussed with particular emphasis on agriculture crop yield estimates.

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“…free versus bound water) could be used for more accurate determination of shelf life. Chua et al (2004) and Chua et al (2005) investigated the application of Thz-TDS in the 0.1e4 THz range for evaluation of moisture content of whole and crushed wheat. The crushed samples were housed in a PTFE sample holder during measurement, since this polymer is transparent to THz radiation, and the system was purged with nitrogen gas to avoid absorption by water vapour.…”

Section: Applications In Food Quality Control Moisture Content Determmentioning

confidence: 99%

Terahertz time domain spectroscopy and imaging: Emerging techniques for food process monitoring and quality control

Gowen

O'Sullivan

O’Donnell

2012

Trends in Food Science & Technology

197

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The Terahertz (THz) region of the electromagnetic spectrum, spanning the range between 100 GHz and 30 THz, has recently enjoyed a renaissance due to technological developments in source and detector components. With the development of THz instrumentation, applications of THz spectroscopy and imaging for quality control of food products have expanded in scope and improved in performance. This article gives an overview of the fundamentals of THz technology and a comprehensive review of applications of THz time domain spectroscopy and imaging for food quality and control. Technical challenges and future outlook for these emerging techniques are also discussed.

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Terahertz time-domain spectroscopy of wheat grain

Cited by 13 publications

References 5 publications

The Detection of Agricultural Products and Food Using Terahertz Spectroscopy: A Review

The Detection of Agricultural Products and Food Using Terahertz Spectroscopy: A Review

Application of terahertz Gouy phase shift from curved surfaces for estimation of crop yield

Terahertz time domain spectroscopy and imaging: Emerging techniques for food process monitoring and quality control

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