| 摘要 |
The primary purpose of this invention is to provide a method whereby the thickness of slag can be measured with a high degree of precision without depending on the operator. This invention uses a microwave distance meter that uses an antenna to emit and receive frequency-modulated microwaves that have a central frequency between 24 and 32 GHz and a frequency-modulation amplitude between 8 and 10 GHz. A first length of time from when the microwave distance meter emits the aforementioned microwaves to when microwaves reflected off the surface of a molten metal are received is computed, as is a second length of time from when the microwaves are emitted to when microwaves reflected off the surface of slag are received. A calculated value c(t1−t2)/2 is computed from the first length of time t1, the second length of time t2, and the speed c of microwaves in air. A correction formula is obtained in advance from calculated-value measurement results from slag of previously-known thicknesses, and during operation, values obtained by using said correction formula to correct calculated values measured successively by the microwave distance meter are used as slag thicknesses. |
