14 April 2011 Measurement of a tree growth condition by the hetero-core optical fiber sensor
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Condition and growth of trees are considered to be important in monitoring global circulation with heat and water, additionally growth of trees are affected by CO2 and air pollutants. On the other hand, since growth of plants is affected by surrounding climates, it is expected that real-time monitoring of crop plants growing makes possible quantitative agricultural management. This study proposed methods in measuring tree growth using hetero-core optical fiber sensors which are suitable for long-term, remote and real-time monitoring in wide area due to their features such as independence from temperature fluctuation and weather condition in addition to advantages of an optical fiber. Two types of sensors were used for that purpose. One of them was a dendrometer which measured radial changes of a tree stem and the other was elastic sensor which was to measure growth of smaller tree such as crop plant. In our experiment, it was demonstrated that the dendrometer was capable of measuring the differences of tree growing trend in period of different seasons such as growing rates 2.08 mm between spring and summer and 0.21 mm between autumn and winter, respectively. Additionally, this study had proposed the method of measuring crop plant growing by the elastic sensor because of its compact and light design and monotonious changes in optical loss to the amount of expansion and contraction.
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Hoshito Uchida, Hoshito Uchida, Shohei Akita, Shohei Akita, Michiko Nishiyama, Michiko Nishiyama, Norikazu Kumekawa, Norikazu Kumekawa, Kazuhiro Watanabe, Kazuhiro Watanabe, } "Measurement of a tree growth condition by the hetero-core optical fiber sensor", Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79812Z (14 April 2011); doi: 10.1117/12.880388; https://doi.org/10.1117/12.880388

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