Study on Water Distribution Imaging in the Sand Using Propagation Velocity of Sound with Scanning Laser Doppler Vibrometer
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概要
- 論文の詳細を見る
We propose a method for the monitoring and imaging of the water distribution in the rooting zone of plants using sound vibration. In this study, the water distribution measurement in the horizontal and vertical directions in the soil layer was examined to confirm whether a temporal change in the volume water content of the soil could be estimated from a temporal changes in propagation velocity. A scanning laser Doppler vibrometer (SLDV) is used for measurement of the vibration velocity of the soil surface, because the highly precise vibration velocity measurement of several many points can be carried out automatically. Sand with a uniform particle size distribution is used for the soil, as it has high plasticity; that is, the sand can return to a dry state easily even if it is soaked with water. A giant magnetostriction vibrator or a flat speaker is used as a sound source. Also, a soil moisture sensor, which measures the water content of the soil using the electric permittivity, is installed in the sand. From the experimental results of the vibration measurement and soil moisture sensors, we can confirm that the temporal changes of the water distribution in sand using the negative pressure irrigation system in both the horizontal and vertical directions can be estimated using the propagation velocity of sound. Therefore, in the future, we plan to develop an insertion-type sound source and receiver using the acceleration sensors, and we intend to examine whether our method can be applied even in commercial soil with growing plants.
- 2013-07-25
著者
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Sano Motoaki
Department Of Applied Electronics Tokyo Institute Of Technology
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Sugimoto Tsuneyoshi
Department of Electronics and Information, Faculty of Engineering, Toin University of Yokohama, Yokohama 225-8502, Japan
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Ohaba Motoyoshi
Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
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Shibusawa Sakae
Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
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Shirakawa Takashi
Department of Electronics and Information, Faculty of Engineering, Toin University of Yokohama, Yokohama 225-8503, Japan
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Nakagawa Yutaka
Department of Electronics and Information, Faculty of Engineering, Toin University of Yokohama, Yokohama 225-8503, Japan
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