| 摘要 |
A method and apparatus for measuring water level in a container using RFID tag is provided. The water level tag group mounted inside the container is tested by a signal transmission and receiving device in order to determine whether there is a complete water level tag group in the testing area or not. Further, one complete water level tag group is chosen, and an inquiry process is made to all RFID tags of the selected complete water level tag group by the signal transmission and receiving device. An effective RFID tag will respond to the inquiry by sending out a radio frequency signal to the signal transmission and receiving device. The signal transmission and receiving device will then perform a data analysis and select a minimum water level value so as to obtain a real-time water level value of the container.
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