Sensing method and apparatus

G - Physics – 01 – J

Patent

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G01J 9/02 (2006.01) G01B 9/02 (2006.01)

Patent

CA 2240727

The invention is a method and apparatus for determining the phase difference of light waves (31) after propagating through each of one or more two-path pairs, a two-path pair being two optical transmission paths connecting a common entry point (25) to a common exit point (29). Coherent light pulses (27) of predetermined duration are fed into the entry point (25) of each two-path pair in a group of two-path pairs at predetermined time intervals, the pulse duration being subdivided into a plurality of predetermined time segments. The phase difference for each two-path pair is determined from amplitude values of the electrical signal.

La présente invention concerne un procédé et un appareil permettant de déterminer la différence de phase entre des ondes lumineuses (31) après que ces dernières se soient propagées au travers de chacune d'une ou plusieurs paires de chemins, une paire de chemins consistant en deux chemins de transmission optique reliant un point d'entrée commun (25) à un point de sortie commun (29). Des impulsions lumineuses cohérentes (27) de durée prédéterminée sont introduites au point d'entrée (25) de chaque paire de chemins d'un groupe de paires à deux chemins à des intervalles de temps prédéterminés, la durée de l'impulsion étant divisée en plusieurs segments de temps prédéterminés. On détermine la différence de phase de chaque paire à deux chemins à partir des valeurs d'amplitude du signal électrique.

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