| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid level measuring device which allows a liquid level to be accurately measured even for a boiling liquid contained in a reservoir.SOLUTION: A liquid level measuring device comprises ultrasonic sensors 15 (15;1≤m≤M) which transmit and receive ultrasonic waves, a transmitting and receiving control part 11 which controls the transmitting and receiving of ultrasonic waves for any one of the ultrasonic sensors 15 at a plurality of positions, an intensity detection part 12 which detects the intensity of ultrasonic waves which satisfy at least an expression: 2≤N, among the ultrasonic waves reflected N times (N: natural number) on the inner surface of a reservoir 21, a gas-liquid determination part 13 which determines whether the reflection point at the inner surface is in contact with a liquid 22 or a gas 24 on the basis of the detected intensity of ultrasonic waves, and a level determination part 14 which determines the liquid level 23 on the basis of the gas-liquid determination results derived from the respective ultrasonic sensors 15(1≤m≤M) at a plurality of positions. |
