A Fiber Bragg Grating Strain Hoop Holder System with Controllable Pretension

Abstract

The invention discloses a controllable-pretension FBG (Fiber Bragg Grating) strain hoop gripper system, and belongs to the technical field of a sensor. The controllable-pretension FBG strain hoop gripper system is characterized by being applied to an FBG strain hoop sensor and being used for measuring hoop strain of a pipeline; the controllable-pretension FBG strain hoop gripper system has the key that a long-rod screw is screwed in the end part by penetrating through a screw hole so as to push a wedge to slide forwards, the increment of an FBG wave length is controlled according to the reading of an interrogator, the controllable pretension is realized, the sensor is tightly attached to the outer wall of the pipeline, and optical fibers at the inner part of the sensor can be always in an effective tension measuring state. The pretension-controllable FBG strain hoop gripper system disclosed by the invention has the beneficial effects that problems that the FBG strain hoop sensor cannot be in tight contact with the pipeline, and the hoop strain of the pipeline cannot be accurately measured are solved, the accuracy of the FBG strain hoop sensor is increased, and the pretension-controllable FBG strain hoop gripper system has the advantages that the pretension can be controlled, the manufacturing and the installing are simple and convenient, the mass production is suitable for being carried out, and the like.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to the structural design of a controllable pretensioned optical fiber grating strain hoop sensor holder system. Background technique [0002] Fiber Bragg grating, as a new generation of non-light source device that has developed most rapidly in recent years, is playing an increasingly important role in related fields such as optical fiber communication and sensing. Fiber gratings have been widely used in sensor fabrication, but the traditional installation process has limitations. Patent [name: A strain hoop sensor for measuring pipe hoop strain, publication number: CN102636128A, publication date: 2012.08.15, China] proposes a strain hoop sensor for measuring pipe hoop strain, the clamp used The holding method is to fix one end, and manually tighten the outer steel pipe of the sensor to fix it. The measured data is often inaccurate because the sensor is not close to th...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a pre-tensioning holder system for a fiber grating strain hoop sensor used to measure the circumferential strain of the pipeline, so as to solve the problem that the ordinary fiber grating strain hoop sensor cannot be tightly attached to the pipeline, and the internal optical fiber cannot be tensioned. The problem of inability to accurately measure the hoop strain of the pipeline

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