WIRELESS TYPE SOIL HUMIDITY MEASUREMENT INSTRUMENT AND AUTOMATIC WATER SUPPLY DEVICE FOR PLANTS

摘要

PROBLEM TO BE SOLVED: To provide a wireless type soil humidity measurement instrument capable of surely measuring the humidity of soil, over a long period.;SOLUTION: The wireless type soil humidity measurement instrument is equipped with a measuring transmission antenna 6 installed at a measuring target region 11 of soil to transmit measuring radio waves, a measuring receiving antenna 7 for receiving the measured radio waves transmitted from the measuring transmission antenna 6, a measuring electric wave transmission means 2 for generating measured electric waves, a received power detecting circuit 8 for measuring the intensity of the measured electric waves received by the measuring receiving antenna 7, and a control part 15 for detecting the humidity of the measuring target region 11 from the receiving intensity of the received power detecting circuit 8.;COPYRIGHT: (C)2008,JPO&INPIT