Fibre optic transducer

G - Physics – 01 – D

Patent

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Details

G01D 5/26 (2006.01) G01R 15/24 (2006.01) G01R 19/00 (2006.01)

Patent

CA 2222766

A fibre optic transducer, which may take the form of a current sensor, and which comprises a first light path which is defined by a light transmitting element (19) and a second light path which is defined by a coil (10) of optical fibre (11). The coil-forming optical fibre (11) has a length which is significantly greater than that of the light transmitting element (19). A modulated light source (14) is provided for directing light simultaneously into both the first and the second light paths. Also, the transducer includes detector/processing circuitry (15 to 17 and 20 to 24) for detecting for light exiting from the light paths during successive time periods that include first and second time intervals t1 and t2. The detector/processing circuitry includes means for referencing the level of light that exits from the coil (10) with respect to that which exits from the light transmitting element (19) and, to this end, use is made of the difference in transmission time of light through the first and second light path having the significantly different lengths.

Transducteur à fibres optiques, qui peut se présenter sous la forme d'un détecteur de courant, et qui comprend un premier trajet de lumière défini par un élément de transmission de la lumière (19) et un deuxième trajet de lumière défini par une bobine (10) à fibre optique (11). La longueur de la fibre optique (11) formant la bobine est nettement plus grande que celle de l'élément de transmission de la lumière (19). Une source de lumière modulée (14) dirige la lumière simultanément dans le premier et le deuxième trajet de lumière. Le transducteur comprend également des circuits de traitement/détection (15 à 17 et 20 à 24) destinés à détecter la lumière à la sortie des trajets de lumière au cours de périodes successives, y compris pendant les premier et deuxième intervalles t¿1? et t¿2?. Les circuits de traitement/détection sont équipés de dispositifs permettant de définir le degré de lumière sortant de la bobine (10) par rapport à celui sortant de l'élément de transmission de la lumière (19). Pour ce faire, on utilise la différence de temps de transmission de la lumière du premier et du deuxième trajet, ces deux trajets ayant des longueurs très différentes.

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