| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a water level observation system for reducing an installation and maintenance cost, inexpensively achieving a remote observation of water level at a plurality of points, having an advantage of a continuous operation for a long time, and using a wireless communication stably operated. <P>SOLUTION: The water level observation system is installed at a predetermined height, and comprises: an active RFID tag 1 provided with a process 111 for intermittently transmitting a signal in accordance with a transmission trigger from a timer 10, and a process 112 for reducing a power consumption by causing a wireless module 11 to transit to a sleep state unless the signal is transmitted; and a receiver 2 for receiving the signal transmitted from the tag 1, and measuring the to-be-observed water level by confirming whether the signal is received at a predetermined time interval. <P>COPYRIGHT: (C)2009,JPO&INPIT |
