Remote curvature fiber sensors using core mismatch structures and OTDR based interrogation

摘要

In this work, a remote curvature sensor using a standard OTDR as the interrogation system is presented. This approach uses a core diameter mismatch sensor which is formed by a short section of a multimode fiber, with a length of 3 mm, sandwiched between two singlemode fibers. In this case, the attenuation of the optical signal will vary as the fiber is bent allowing interrogating the sensor with OTDR technology. Preliminary results indicate a resolution range of ～0.0003 cm~(-1), sensitivity in the range of ～-208.46 dB/cm~(-1) and a variation of 2.67 dB in the OTDR trace within the bend radius range.