| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a radio unit which is further suitably set in a manhole or the like and used to detect flood. <P>SOLUTION: The radio unit (wireless tag 1) includes: a battery 11 which supplies power to each part; a flood sensor 12 which detects a flood; a vibration sensor 13 which detects a vibration applied from the outside of the manhole; a vibration pattern determination circuit 14 which determines, in response to a detection output of the sensor 12, whether the vibration detected by the vibration sensor 13 is matched to a predetermined pattern; and a transmitting circuit 15 which transmits, when the determination circuit 14 determines matching to the predetermined pattern, a predetermined signal by receiving the power from the battery 11. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
