These systems comprise sensors formed of an optical fiber conductor (4) fitted inside a sheath (8). The device comprises a support (1) provided with cylindrical revolving rollers (2, 3) made of a soft material which rotate in reverse direction to each other and between which an optical fiber conductor (4) is moved; and a supporting device (7) of the sheath (8) which makes it to be in line with the optical fiber conductor (4) so that it is inserted inside the sheath (8) as it is moved by the rollers (2, 3). It is provided with oil supply means (10) toward the optical fiber (4) to facilitate insertion thereof inside the sheath (8).