| 摘要 |
<p>The invention concerns a method using a permeameter comprising a measuring head (2) opposite which the sheet or strip (1) is displaced step by step. It comprises a registration including the determination of the permeability profile of the strip (1) over a period T including two different successive permeability ranges, determination of a sinusoid from said profile, then of two extrema of said sinusoid, centering the measuring head (2) on the second extremum, and moving the strip step by step by T/2 with, at each step, a permeability measurement.</p> |
