| 摘要 |
PROBLEM TO BE SOLVED: To provide a water leak detection method, a water leak detection system and an RFID tag capable of detecting a water leak simply, surely and inexpensively by utilizing an existing RFID system without requiring a large-scale device. SOLUTION: A tag 2 operated in some frequency in LF band, MF band, HF band and VHF band (for example, 13.56 MHz band) is installed on a place where a water leak often occurs such as a periphery of a joint of a distributing water pipe, and existence of a water leak is determined based on a change of the communication state between the tag 2 and a reader/writer 7. The tag 2 operated in a short wave band such as the HF band or the VHF band is more inexpensive than a tag operated in another frequency, and a versatile reader/writer 7 can be utilized, and a tag antenna has a structure wherein a lead wire is wound and the antenna shape can be changed freely in accordance with a domain where the water leak is detected. Consequently, the water leak can be detected simply, surely and inexpensively. COPYRIGHT: (C)2007,JPO&INPIT
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