To provide a device for measuring a liquid surface position which dispenses with the connection of an electric cable to a sensor, and thus can improve reliability, and also can reduce the cost of installation, and moreover can increase the degree of freedom of the installation.
A plurality of IC tags 21, 22, 23, ... are disposed in the vertical direction and a shield 4 controlling the intensity of a radio wave radiated from each IC tag is provided at least at the outer circumference of the IC tag. It is detected that radio communication between at least one of the IC tags 21, 22, 23, ... submerged by a rise of a water level and an IC tag reader 15 has changed from a state that the communication is possible to a state that the communication is impossible, and thereby the water level of a river or the like is measured.
SHIMIZU TAKAO
SAITO KENICHI
KOBAYASHI MAKOTO
TOKYO KENSETSU CONSULTANT KK
TRANSCORE KK
FUJI BELLOWS CO LTD
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