Temperature insensitive fiber-optic torque and strain sensor

Details Temperature insensitive fiber-optic torque and strain sensor Temperature insensitive fiber-optic torque and strain sensor

G - Physics

01

B

G01B 11/16 (2006.01) G01D 3/028 (2006.01)

Patent

CA 2413098

The present invention provides a simple design for a temperature-insensitive extrinsic polarimetric strain sensor. The sensing element is a thin sheet of photoelastic material that is bonded to the test object. It is illuminated with linearly polarized light with the polarization direction at 45 degrees relative to the strain-induced fast and slow axes in the photoelastic material. The sensor measures the difference between the strains along these two orthogonal directions. The reduced sensitivity of the sensor to temperature results from the fact that the illumination is perpendicular to the surface of the test object. All polarization components that are parallel to the surface will experience identical refractive index changes due to thermal effects. Consequently, a measurement of the difference in strains along two directions in the surface plane is insensitive to temperature.

L'invention concerne un modèle simple de capteur de contrainte polarimétrique extrinsèque insensible à la température. L'élément capteur est une mince feuille de matériau photoélastique liée à l'objet testé, que l'on illumine avec de la lumière à polarisation linéaire, selon une direction de polarisation inclinée à 45 degrés par rapport aux axes rapide et lent induits par la contrainte dans le matériau photoélastique. Le capteur mesure la différence entre les contraintes dans ces deux directions orthogonales. La sensibilité réduite du capteur à la température vient du fait que l'illumination est perpendiculaire à la surface de l'objet. Toutes les composantes de polarisation parallèles à la surface subissent des modifications d'indice de réfraction identiques en raison des effets thermiques. La mesure de la différence de contrainte suivant deux directions dans le plan de la surface est donc insensible à la température.

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