| 摘要 |
PROBLEM TO BE SOLVED: To detect the existence of the liquid within a container and the quantity of liquid by transmitting ultrasonic waves into the container, and receiving the reflected waves. SOLUTION: A detector body 8 is connected to a transducer 2. The ultrasonic waves transmitted from the transducer 2 become multiple reflected waves E1, being reflected from the boundary face between the container 1 and water W, and also become multiple reflected waves E2 , being reflected from the boundary face (water surface) between the water W and the air. Here, it is recognized that the multiple reflected waves E2 are from wafer surface by detecting the multiple reflected waves E2 rippling in the direction of amplitude and the direction of time axis, fixing eyes upon that ripples exist at all times on the water surface even though inconsiderable. At the same time, the quantity of water is obtained by operation, based on the time from the transducer 2 sending ultrasonic waves to receiving the multiple reflected waves E2 . Furthermore, even in the case that a small quantity of water exists in the container, the security of accuracy in detection on such a level that there is no hindrance in practical use is enabled. |
