Non-destructive evaluation of chlorophyll content in tea leaves using hyperspectral reflectance from a compact spectrometer

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  • SONOBE Rei
    静岡大学学術院農学領域，静岡大学ティーサイエンス研究所
  • HIRONO Yuhei
    農業・食品産業技術総合研究機構果樹茶業研究部門，静岡大学ティーサイエンス研究所
  • SEKI Haruyuki
    静岡大学学術院農学領域

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Other Title
  • マイクロ分光器ハイパースペクトルデータを用いた茶葉のクロロフィル含量非破壊評価

Abstract

<p>Chlorophyll content has been used as an indicator for assessing photosynthetic ability, health and defense against a variety of degenerative diseases. Hyperspectral remote sensing offers some non-destructive methods and has played an important role in evaluating vegetation characteristics. However, the prices of traditional field portable spectroradiometers, such as Ocean Optics Hyperspectral Vis-NIR spectroradiometers and Analytical Spectral Devices FieldSpec series, have not yet decreased to consumer levels, which prevents much practical use. Recently, fingertip-sized spectrometers have been developed and then they could be powerful tools for evaluating vegetation characteristics. In the present study, a compact spectrometer (C12880MA-10, Hamamatsu Photonics) was used to evaluate chlorophyll content in tea leaves. Incorporating pre-processing techniques was effective for obtaining estimated values with high accuracy and then de-trending was the best pre-processing technique in this study, achieving an RPD of 2.03 and an RMSE of 3.07 μg cm－2. The proposed method is cost effective, practical for consumers to apply and will enable effective crop management.</p>

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