| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of detecting liquid level in which the level of a furnace-melted matter can be stably detected over a long period of time without being influenced by the gain fluctuation of a transmitting and receiving system resulted from the contact force of an elastic wave transmitting element and receiving element to the furnace wall and others. SOLUTION: When an elastic wave transmitting element 11 and an elastic wave receiving element 12 are set on a furnace outer wall whose circumference is covered with a refractory, and an elastic wave is emitted from the elastic wave transmitting element 11 into a furnace 100 to detect the liquid level of a furnace melted matter 101 on the basis of the received signal obtained from the elastic wave receiving element 12 by the emission of the elastic wave, the surface wave propagating the furnace outer wall surface and the reflected echo by the furnace inner wall are received by the elastic wave receiving element 12, the wave height of the reflected echo is corrected on the basis of the wave height of the surface wave, and the level is detected on the basis of the wave height of the corrected reflected echo. |
