Optical fibre sensor for measuring a parameter, method of...

Details Optical fibre sensor for measuring a parameter, method of... Optical fibre sensor for measuring a parameter, method of...

G - Physics

01

N

G01N 21/77 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2082686

-14- ABSTRACT A fibre optic sensor especially suitable for determining the gas content of a mixture comprises at least one optical fibre for measuring a physical or chemical parameter sensitive to a change in an environment (E) within which the sensor is placed. The fibre comprises a cladding (3), a core (5) surrounded by this cladding, an axis (7) with a length in the direction of this axis, and, locally along its length, parts (9) with variations in optical thickness forming an optical diffraction grating (10). At least one part of the cladding (3) comprises in its composition an active material whose optical properties vary as a function of the change in the parameter within the environment where the sensor is placed. The active material may be a heteropolysiloxane. In order to analyse the change in the parameter, a reflectometric analysis may be provided.

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