Active q-point stabilization for linear interferometric sensors

G - Physics – 01 – B

Patent

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G01B 9/02 (2006.01) G01D 5/353 (2006.01)

Patent

CA 2499009

A linear interferometric sensor system (S00) in which the light output from the interferometric sensor (503) is optically band-pass filtered before conversion to an electrical signal (508a) by an adjustable band-pass filtering device (506) and the center wavelength of the adjustable band-pass filtering device is controlled by a feedback circuit (515) responsive to the steady state component of the electrical signal corresponding to the filtered sensor return. In a preferred embodiment, the adjustable band-pass filtering device is an electrically tunable optical filter. The invention is particularly useful in self calibrating interferometric/intensity-based sensor configuration, but can be used with other linear interferometric sensor configurations.

L'invention concerne un système de capteur interférométrique linéaire dans lequel la sortie lumineuse du capteur interférométrique est optiquement filtrée en passe-bande avant conversion d'un signal électrique par un dispositif de filtrage passe-bande réglable et la longueur d'onde centrale du dispositif de filtrage passe-bande réglable pouvant être réglée et commandée par un circuit de rétroaction répondant au composant d'état stable du signal électrique correspondant au retour du capteur filtré. Dans un mode de réalisation préféré, le dispositif de filtrage passe-bande réglable consiste en un filtre optique électriquement accordable. L'invention est particulièrement utile dans une configuration de capteur basée sur l'intensité/à autocalibrage interférométrique, mais peut également être utilisée dans d'autres configurations de capteur interférométrique linéaire.

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