| 摘要 |
A strain transducer strand (10) is provided comprising an elongatable central core (12) around which are helically wound one or more plastic tubes (14) each of which contains an optical fibre (16). Each tube (14) is overfilled with the optical fibre (16), such that the fibre (16) is longer than the tube (14). As the transducer strand (10) experiences strain, the core (12), plastic tubes (14), and optical fibres (16) elongate, with the helical winding acting as gearing to produce a reduced elongation in the fibres (16) proportional to the elongation of the transducer strand (10). The degree of elongation may be detected by monitoring the optical properties of light transmitted along the fibres (16). The transducer strand is particulary intended for incorporation into elongate load bearing members, such as ropes. |
