发明名称 |
METHODS OF AND APPARATUS FOR DETERMINING PARTICLE INCLUSION AND SIZE IN MOLTEN METAL |
摘要 |
Methods and apparatus for measuring the cleanliness of molten metal. Direct current is passed through molten metal advancing through a passage. A voltage signal is analyzed for the presence of solid generally non-metallic inclusions in the metal. A method includes sampling digital data of the voltage signal to generate data samples; updating a delayed running average of the data samples to establish a baseline for identifying sudden changes in amplitude of the data samples; determining a threshold by adding a prescribed value to the baseline; identifying a possible inclusion when a significant number of data samples exceeds the threshold; storing a maximum count as the data samples using peak detection until a prescribed number of the data samples fall below the threshold; and comparing a parameter of the possible inclusion with a lookup table to categorize the possible inclusion as either (i) an actual inclusion or (ii) noise. |
申请公布号 |
EP2941641(B1) |
申请公布日期 |
2017.02.22 |
申请号 |
EP20140718221 |
申请日期 |
2014.03.10 |
申请人 |
Novelis, Inc. |
发明人 |
HILDENBRANDT, Leslie Calvin;THORNTON, Gary |
分类号 |
G01N27/416;G01N33/20;H03K5/125 |
主分类号 |
G01N27/416 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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