JP2841783B

• Main Author: ISHIDA YOSHIZO
• Format: Patent
• Language: English
• Published: 24.12.1998
• Edition: 6
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

PURPOSE:To measure the liquid level with good accuracy by providing a float of a smaller specific gravity than a liquid in a container, and a reflecting plate of a larger specific gravity than the liquid which is suspended from the float in a swaying fashion. CONSTITUTION:An ultrasonic pulse generated from an ultrasonic probe 6 at the bottom of a container 1 is reflected by a reflecting plate 10 suspended from a float 8, and received again by the probe 6. The distance (m) between the probe 6 and reflecting plate 10 is obtained by measuring the time since the pulse is generated until it is received by the probe 6. Even when the height of the float 8 is changed in accordance with the increase/decrease of the storing amount of a liquid 2, the distance (l) between the float 8 and reflecting plate 10 is constant. Therefore, the distance between the probe 6 and liquid surface is (m+l). Moreover, as more bubbles are present near the liquid surface, it is possible to face the reflecting plate 10 to the probe 6 at the position other than where the air bubbles are present if the distance (l) between the float 8 and reflecting plate 10 is set suitably. The influences of the air bubbles can be removed. In this manner, the liquid level can be measured with high accuracy.