| 摘要 |
<p>A signal processing for determining the flow velocity of molten metal by measuring the vibration due to Karman vortex comprising a frequency component analyzing processing (A) of analyzing the frequency component of a measurement signal produced by a vibration sensing means that a measuring rod has, a first judgment (B1-B7) for extracting peaks that a peak envelope curve of the spectrum curve drawn by the processing (A) has and judging that vibration due to Karman vortex is present only if the difference or ratio between the maximum and minimum of the intensity of the spectrum among the peaks is over a predetermined value, a second judgment (C1-C4) for selecting only peaks having a spectrum intensity of over a predetermined ratio with respect to the peak having the maximum spectrum intensity from among the extracted peaks if vibration due to karman vortex is judged to be present and selecting the peak having the maximum frequency, and flow velocity calculation (D) for calculating the flow velocity of the molten metal by using the frequency.</p> |
