| 摘要 |
PROBLEM TO BE SOLVED: To allow liquid level measurement less affected by a reverberation characteristic when a liquid level is low, robust against a liquid face change in charge of a liquid or the like, and stable over from the time when the liquid level is low up to the time when the liquid level is high, by simple control. SOLUTION: This ultrasonic level gage is provided with an ultrasonic transducer 10 attached to a bottom outer wall face of a container 30, for transmitting an ultrasonic wave toward a face of a liquid stored in an inside of the container, and for receiving a reflected wave from a liquid face. The ultrasonic transducer 10 is arranged concentrically with a disk-like piezoelectric element 12 and a ring-like piezoelectric element 13, and the two piezoelectric elements 12, 13 transmit and receive the ultrasonic wave by different vibration conditions (vertical vibration, lateral vibration). COPYRIGHT: (C)2009,JPO&INPIT |
