Acoustic liquid level measurement device with gas composition compensation property for fuel tank in car, has feeding unit to supply fluid originating from tank into portion of waveguide located above liquid level

摘要

A waveguide (12) is connected to transducer (14) provided outside liquid (16) for transmitting and receiving acoustic signals and is extended into liquid. A feeding unit supplies the fluid originating from a tank (18) into a portion of the waveguide located above a liquid level. An independent claim is also included for liquid level measurement method.