In the case of large density difference, there is a velocity separation between different media, making the measurement more difficult, cross-correlation method is still usable.
在密度差别较大时，存在着不同介质间的速度分离，给相关法测量带来困难。
When the forward slip difference is large, the influence of velocity difference is small and workpiece is easily bent…
前滑差小时，速差起主导作用，轧件易往小辊或慢辊侧弯。
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