Fiber optic seismic sensor

G - Physics – 01 – H

Patent

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Details

G01H 9/00 (2006.01) G01P 15/08 (2006.01) G01P 15/093 (2006.01)

Patent

CA 2384971

A fiber optic seismic sensor (10) includes a pair of central support members (30, 32) formed of a metal such as aluminum. A support plate (42) has an inner portion (39) retained between the central support members (30, 32) and an outer portion (41) that extends beyond the central support members (30, 32). A pair of hollow cylindrical substrates (14, 18) are mounted in axial alignment on opposite sides of the outer portion (41) of the support plate (41) with the central support members (30, 32) extending through the centers of the substrates (14, 18). The central support member (30) has a cavity (36) in one end, and the central support member (32) has a projection (38) extending therefrom and arranged to be received within the cavity (36) in the first central support member (30). The support plate (42) includes a passage (44) arranged to receive the projection (38) such that the inner portion (39) of the support plate (42) is retained between the first and second central support members (30, 32). A first spiral-wound optical fiber coil (14) is formed on an outer end (22) of the first substrate (14), and a second spiral-wound optical fiber coil (16) is formed on an outer end (26) of the second substrate (16). An interferometer (50) includes the first spiral-wound optical fiber coil (14) in a first leg and the second spiral-wound optical fiber coil (16) in a second leg. Acceleration along an axis perpendicular to the planes of the optical fiber coils (14, 16) causes a deflection in the support plate (42), which changes the difference in length of optical fiber coils (14, 16).

La sonde sismique à fibre optique (10) de la présente invention comprend une paire d'éléments supports centraux (30, 32) faits d'un métal tel que l'aluminium. La partie intérieure (39) d'une platine support (42) est maintenue entre les éléments support centraux (30, 32), une partie extérieure (41) dépassant au-delà des éléments support centraux (30, 32). Une paire de substrats cylindriques creux (14, 18) sont montés axialement alignés de part et d'autres de la partie extérieure (41) de la platine support, les éléments support centraux (30, 32) passant par les centres des substrats (14, 18). Une extrémité de l'élément support central (30) est pourvue d'une cavité (36). Une protubérance (38) prenant naissance sur l'autre élément support central (32) est agencée de façon à être reçue dans la cavité (36) du premier élément support central (30). La platine support (42) comporte un passage (44) agencé pour recevoir la protubérance (38) de façon que la partie intérieure (39) de la platine support (42) soit bloquée entre les deux éléments support centraux (30, 32). Une première fibre optique bobinée en spirale (14) est disposée sur une extrémité extérieure (22) du premier substrat (14), de même qu'une seconde fibre optique bobinée en spirale (16) est disposée sur une extrémité extérieure (26) du second substrat (16). Un interféromètre (50) intègre la première fibre optique bobinée en spirale (14) dans une première branche et la seconde fibre optique bobinée en spirale (16) dans une seconde branche. Toute accélération selon un axe perpendiculaire aux plans des fibres optiques bobinées en spirale (14, 16) provoque une déflexion de la platine support (42), ce qui modifie les longueurs des fibres optiques bobinées en spirale (14, 16).

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