| 摘要 |
A method for manufacturing a plug, comprising the flowing, in a tube (12), of a first fluid (F1) and a second fluid (F2), said second fluid (F2) being in contact, along an interface (I 12 ), with said first fluid (F1) so that the friction on the inside surface (14) of the tube (12) deforms this interface (I 12 ), the first and second fluids presenting different optical properties.
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