FIBRE OPTIC SENSOR

摘要

A sensor assembly (1) comprises an optical fibre (4) and a transducer (23) arranged to apply transverse strain to a localised portion (24) of the fibre. Birefringence effects induced by the fibre strain are remotely sensed to obtain a signal representative of the transducer input which in turn is connected to a current sensing coil (34) thereby enabling electric current in a conductor (32) to be remotely sensed. The fibre is a metal coated fibre having a metallic jacket (19) enclosing a silica core and doped silica cladding layer. Damage to the fibre and the effects of creep are thereby avoided. The resulting sensor is particularly suited to the measurement of high currents in power distribution systems.