Multi-core fiber microbend sensor

A microbend sensor, multi-core optical fiber technology, applied in instruments, measurement of force by measuring the change of optical properties of materials when they are stressed, measuring devices and other directions, can solve problems such as directions that cannot sense pressure
CN109238534AInactive Publication Date: 2019-01-18NANJING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF POSTS & TELECOMM
Publication Date
2019-01-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a multi-core fiber microbend sensor. The sensor comprises a fixed pipe sleeve, a multi-core fiber, and a deformer, wherein the fixed pipe sleeve is made of a rigid material, the multi-core fiber is arranged in the middle of the fixed pipe sleeve, a clearance between the fixed pipe sleeve and the multi-core fiber is filled with a flexible material, the fixed pipe sleeve andthe deformer are connected through an elastomer structure, the deformer is made of the rigid material, and the deformer is provided with periodic deformation teeth. External pressure is transferred toa fiber microbend deformer through deformation of the deformer, so that the periodic deformation teeth in the fiber microbend deformer act on the multi-core fiber in the fixed pipe sleeve, then the multi-core fiber bends slightly, different fiber cores in the multi-core fiber have different curvature radiuses of microbending due to different spatial positions, therefore, different fiber cores aredifferent in microbending loss, external pressure and direction change can be learnt according to losses of optical signals in different fiber cores, and external pressure and direction can be sensedat the same time.
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Description

technical field

[0001] The invention relates to a multi-core optical fiber micro-bending sensor, relates to the technical field of optical fiber sensing, in particular to a pressure micro-bending sensor based on a multi-core optical fiber, capable of measuring the magnitude and direction of external pressure. Background technique

[0002] When light is transmitted in the optical fiber, the phase and amplitude of the light wave will change due to external temperature, pressure, vibration and other factors. The optical fiber sensor is a sensor that uses this principle to detect changes in physical quantities. Since the optical path of the optical fiber is closed, the optical fiber sensor is more suitable for measurement in harsh environments such as high temperature and high pressure, flammable, explosive, and corrosive conditions. Therefore, fiber optic sensors have been widely used in aerospace, oil exploration, automatic control and other fields.

[0003] As an important o...

Claims

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