Apparatus and method for using a counter-propagating signal...

G - Physics – 02 – B

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G02B 6/27 (2006.01) G01M 5/00 (2006.01) G01M 11/02 (2006.01) G01R 31/08 (2006.01) G08B 13/186 (2006.01) H04B 10/12 (2006.01) H04B 10/26 (2006.01)

Patent

CA 2593628

An apparatus and method for using a counter-propagating signal method for locating events is disclosed. The apparatus and method uses a Mach Zehnder interferometer through which counter-propagating signals can be launched. If the sensing zone of the Mach Zehnder interferometer is disturbed, modified counter-propagating signals are produced and the time difference between receipt of those signals is used to determine the location of the event. Polarisation controllers (43, 44) receive feedback signals so that the polarisation states of the counter-propagating signals can be controlled to match the amplitude and/or phase of the signals. Detectors are provided for detecting the modified signals.

L'invention concerne un dispositif et un procédé pour l'utilisation de signaux de contre-propagation permettant la localisation d'événements. On fait appel à un interféromètre de Mach Zehnder pour le lancement de ces signaux. Si la zone de détection de l'interféromètre est perturbée, on produit des signaux de contre-propagation modifiés, et la différence de temps de réception de ces signaux permet alors une localisation d'événement. Des contrôleurs de polarisation (43, 44) reçoivent des signaux de rétroaction pour que les états de polarisation des signaux de contre-propagation puissent être contrôlés aux fins de concordance avec l'amplitude et/ou la phase des signaux. On décrit enfin des détecteurs pour la détection des signaux modifiés.

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