OPTICAL FIBER SENSOR WITH EVANESCENT WAVES

摘要

The present invention relates to a sensor comprising an optical fiber for propagating infrared light at least one infrared wavelength and generating outward evanescent waves for detecting infrared signatures of an external medium, the fiber having on its length - two sections of fiber for guiding an infrared wave, and - a curved part (F) which connects the two fiber sections and which is intended to come into contact with the external medium to detect the infrared signatures disturbing the infrared wave. propagation of evanescent waves propagating along the fiber. This sensor is characterized in that it comprises means (C, A, C1, C2, P) for protecting the curved part (F) of the fiber against external mechanical aggression, while guaranteeing a contact zone (Z). between the outer medium and said curved portion (F) of the fiber.