Optical method for the transmission of signals from remote...

G - Physics – 01 – H

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G01H 9/00 (2006.01) G01D 5/353 (2006.01)

Patent

CA 2387944

An electromechanical sensor (12) produces an electrical signal in response to a change in a physical parameter being monitored. An optical phase modulator (16) is arranged such that electrical signals from the electromechanical sensor (12) causes a phase change in optical signals propagating in the two legs (46, 48) of the interferometer (44). Applying the electrical signal to the phase modulator (16) changes the optical path length difference between the interferometer legs (46, 48) and produces an optical signal that can be transmitted to a remote location. The optical signal into an electrical signal that can be processed to measure changes in the parameter.

L'invention concerne un capteur électromécanique (12) produisant un signal électrique en réponse à un changement de paramètre physique soumis au contrôle. Un modulateur de phase optique (16) est disposé de manière que les signaux électriques provenant du capteur électromécanique (12) provoque un changement de phase au niveau des signaux optiques se propageant dans les deux branches (46, 48) de l'interféromètre (44). L'application du signal électrique au modulateur de phase (16) modifie la différence de longueur de chemin optique entre les branches de l'interféromètre (46, 48) et produit un signal optique pouvant être transmis à un point distant. Le signal optique converti en signal électrique peut être traité de manière à mesurer les changements de paramètre.

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