| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic liquid level gauge which can properly receive a reflection wave reflected on a liquid surface and which can measure the height of the liquid surface, even when the liquid surface in a tank is inclined due to a lateral G, the inclination state of a road surface, or the like, when a vehicle travels. SOLUTION: The ultrasonic liquid level gauge 1 for measuring the height of the liquid surface 5 in the on-vehicle liquid tank 3 includes an oscillator element 9 for oscillating an ultrasonic wave 7P like a spherical wave toward the liquid surface 5, a receiver element 11 for receiving the reflection wave 7R of the ultrasonic wave 7P reflected on the liquid surface 5, and a measurement means 13 for measuring the height of the liquid surface 5 from the time difference between the time when the ultrasonic wave 7P is oscillated and the time when the reflection wave 7R is received. COPYRIGHT: (C)2004,JPO |
