Recoverable optical fiber micro-bending sensing device

Abstract

The invention relates to a recoverable optical fiber micro-bending sensing device which comprises a vertical rod, an elastic steel sheet, an upper toothed plate, a lower toothed plate, an elastic cushioning material, a micro-bending sensing optical fiber and a crossbeam. The lower toothed plate is fixed to the crossbeam, the upper toothed plate is fixed to the vertical rod through the elastic steel sheet, and the upper toothed plate and the lower toothed plate are staggered by the distance of a half tooth position. The micro-bending sensing optical fiber is wrapped with the layer of elastic cushioning material and sandwiched between the upper toothed plate and the lower toothed plate. When external force acts on the vertical rod to enable the vertical rod to be bent, the vertical rod drives the upper toothed plate to downwards move through the elastic steel sheet, thus the distance between the upper toothed plate and the lower toothed plate 4 is decreased, and the micro-bending sensingoptical fiber sandwiched between the upper toothed plate and the lower toothed plate generates the bending loss accordingly. By detecting the change of optical power transmitted in the micro-bendingsensing optical fiber, the external force applied to the vertical rod can be detected. When the external force is removed, the elastic steel sheet drives the upper toothed plate to recover to the normal position, and the micro-bending sensing optical fiber recovers to the original state under the effect of the elastic cushioning material.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a recoverable optical fiber microbend sensing device. Background technique [0002] The fiber optic microbending sensor belongs to the light intensity modulation type fiber optic sensor. Its working principle is based on the fact that the optical fiber is subjected to external stress to produce microbends, and a part of the optical energy propagating in the optical fiber is transferred to the cladding to propagate, thereby causing optical power loss. When the fiber is micro-bent, the light transmitted in the fiber undergoes mode coupling, so that part of the guided mode becomes a radiation mode, resulting in micro-bending loss. In recent years, fiber optic microbend sensing technology has become a research hotspot as an emerging monitoring technology, and a variety of new fiber optic sensors have been used to replace traditional fiber optic microbend se...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing optical fiber microbend sensor that the sensing fiber is easily broken and the sensing fiber is not easy to recover after microbending, and realize a recoverable optical fiber microbend sensing device

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