Journal
OPTICS EXPRESS
Volume 28, Issue 21, Pages 30644-30655Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.404618
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Funding
- Grains Research and Development Corporation [UA00162]
- Waite Research Institute
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Frost is estimated to cost Australian grain growers $ 360 million in direct and indirect losses every year. Assessing frost damage manually in barley is labor intensive and involves destructive sampling. To mitigate against significant economic loss, it is crucial that assessment decisions on whether to cut for hay or continue to harvest are made soon after frost damage has occurred. In this paper, we propose a non-destructive technique by using raster-scan terahertz imaging. Terahertz waves can penetrate the spike to determine differences between frosted and unfrosted grains. With terahertz raster-scan imaging, conducted in both transmission and reflection at 275 GHz, frosted and unfrosted barley spikes show significant differences. In addition, terahertz imaging allows to determine individual grain positions. The emergence of compact terahertz sources and cameras would enable field deployment of terahertz non-destructive inspection for early frost damage. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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