Sensing device having a large diameter d-shaped optical...

Details Sensing device having a large diameter d-shaped optical... Sensing device having a large diameter d-shaped optical...

G - Physics

01

D

G01D 5/26 (2006.01) G01B 11/16 (2006.01) G01D 5/353 (2006.01) G01K 11/32 (2006.01) G01L 1/24 (2006.01)

Patent

CA 2454970

An optical sensor formed from an optical waveguide having at least one core surrounded by a cladding and a large diameter generally D-shaped portion is disclosed. Axial or compressive strain across the D-shaped cross section may be determined by measuring the change in polarization or birefringence of the light output from the sensor. A layer responsive to a parameter may be disposed on a flat portion of the D-shaped portion of the sensor. The refractive index of the layer changes and/or the layer applies a strain on the sensor in response to the parameter. Changes in the refractive index of the layer alters the light output from the sensor, which is measured over time and correlated to the parameter.

Capteur optique formé d'un guide d'ondes optiques comprenant au moins un noyau entouré d'une gaine et une partie de fort diamètre globalement en forme de D. La déformation ou compression longitudinale de la section en D peut être évaluée en mesurant le changement de polarisation ou de biréfringence d'un flux lumineux s'échappant du capteur. Une couche sensible à un certain paramètre peut être placée sur une partie plate de la partie en D du capteur. Lorsque la couche est soumise au paramètre, son indice de réfraction change, ou elle soumet le capteur à une tension. Le changement d'indice de réfraction de la couche altère le flux lumineux provenant du capteur, ce flux lumineux est mesuré au fil du temps et mis en corrélation avec le paramètre.

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