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| A wireless-sensor for soil water content powered by solar energy |
1.College of Information and Electrical Engineering, China Agricultural University,Beijing 100083,China; 2.School of Technology,Beijing Forestry University,Beijing 100083, China）
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Abstract Either power-supply or long-distance cable is hardly available within field-scale. Considering this,we present a new sensor of soil water content based on the impedance transform of frequency domain. The sensor is powered by solar-energy and the data can be instantly transmitted by wireless communication. The electrodes of the sensor are imbedded into the bottom of a supporting rod so that it can measure moisture contents at various depths of 5～500 mm. Moreover,to reduce entire energy consumption,the optimal design with time-sharing sequence is considered. The experiment results indicate that the sensor is a promising tool for monitoring water content in field-scale with solar power and wireless communication.
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2009, Vol. 30 
