| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem with conventional level measurement using the reflectance of an ultrasonic wave that the reliability of measurement drops depending on the surface state of a pipe to be measured. SOLUTION: With ultrasonic wave transmitting and receiving means 11a, 11b, 11c, 12a, 12b, and 12c attached to a level measuring pipe 4, whether the point of reflection/transmission of an ultrasonic wave is a gas phase or a liquid phase is determined by specifying, from signals received by the ultrasonic wave transmitting and receiving means, the presence or absence of reflected waves from inner walls 4a and 4b of the level measuring pipe 4, transmitted waves from the ultrasonic wave transmitting and receiving means facing each other, and oblique transmitted waves from the ultrasonic wave transmitting and receiving means attached to positions of different heights on the opposite sides of the level measuring pipe 4. COPYRIGHT: (C)2011,JPO&INPIT |
