Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-04-27
1994-08-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73768, H01J 516
Patent
active
053368835
ABSTRACT:
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 localised portion 24 of the fibre 4 is stripped to remove an outer jacket and is embedded in a relatively rigid matrix material. 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.
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Butcher Steven J.
Hobby James D.
Focas Limited
Le Que T.
Nelms David C.
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