A kind of vibration sensitive optical fiber and its manufacturing method

Abstract

The invention relates to a vibration-sensitive optical fiber and a manufacturing method thereof, belonging to the technical field of optical fibers. The vibration-sensitive optical fiber includes a core, a silica cladding coated on the outside of the core, and a medium modulus coating coated on the outside of the silica cladding. The Young's modulus of the medium modulus coating after curing is between Between 50MPa and 200MPa, the single side wall thickness of the medium modulus coating layer is between 70 μm and 150 μm, and the vibration sensitizing layer is coated on the outside of the medium modulus coating layer. The invention adopts a layer of medium modulus coating layer to replace the low modulus inner coating layer and high modulus outer coating layer of ordinary commercially available optical fibers, and uses high elasticity as the vibration sensitization layer, which can effectively improve the optical fiber's resistance to vibration. The sensitivity of sound and other mechanical vibrations improves the performance of optical fibers as vibration and sound sensing media, thereby improving the sensitivity of the corresponding detection and monitoring systems.

Description

technical field [0001] The invention relates to a vibration-sensitive optical fiber and a manufacturing method thereof, belonging to the technical field of optical fibers. technical background [0002] With the rapid development of fields such as industry, agriculture, medicine, and security, the information that vibration brings to people is becoming more and more important, which can be effectively detected and identified, and the vibration information can be used to bring great benefits to human beings. For example, areas such as earthquake monitoring, pipeline leakage detection, perimeter prevention and early warning, and track monitoring rely heavily on vibration detection. In addition, vibration-sensitive optical fiber deformation due to stress and temperature can also be used to monitor parameter changes in other fields. [0003] Traditional sensing detectors obtain information by laying sensor probes along the test area, which has the disadvantages of high cost and ...

AI Technical Summary

Problems solved by technology

From the research conclusions mentioned above, it can be seen that too low Young's modulus is not conducive to the vibration sensitivity of the optical fiber, so the value of ΔΦ / (ΦΔP) of the vibration-sensitive optical fiber with an outer diameter of about 1mm produced by this type of optical fiber is often low. at 2×10 -12 dyn / cm 2 , cannot meet the requirements for use

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