| 摘要 |
PURPOSE: To provide a converter on the outside of a container by using one or more waveguides each of which has at least one or more pulse reflecting discontinuous sections. CONSTITUTION: A waveguide 14 which is actuated by means of an ultrasonic converter 10 is used as the apparatus of a liquid level monitoring device installed to a container 1. The converter 10 is installed to the outside of the container 1 and the waveguide 14 is partially dipped in a liquid pool 3 from the converter 10 through the through port 2 of the closed container 1. The end section of the waveguide 14 has a plurality of pulse reflecting discontinuous points constituted of the end face 18 of the end section and a series of steps 20A and 20B formed at prescribed intervals from the end face 18. A ram wave pulse 22 excited by the converter 10 advances in the direction shown by the arrow and echoes 24, 26A, and 26B respectively produced by the reflection at the discontinuous points are not received by the converter 10. A pulse trigger and an echo analyzer 12 connected to the converter 10 measure the liquid level in the pool 3 by analyzing the relation between the echoes and discontinuous points. |
