Strain hoop sensor used for measuring hoop strain of pipeline

Abstract

The invention discloses a strain hoop sensor used for measuring the hoop strain of a pipeline and belongs to the technical field of sensing. The strain hoop sensor is characterized by being packaged by a double-layer capillary steel pipe, wherein the strain hoop sensor packaged by a double-layer capillary steel pipe is tightly looped to the pipeline by virtue of a metal support and a clamping piece, and the capillary steel pipe is pasted to the outer wall of the pipeline by virtue of epoxy resin. The arc diameter of the contact surface of the metal support and the pipeline is equal to the external diameter of the pipeline, and the metal support is tightly contacted with the pipeline. The measuring sensitivity of the sensor can be adjusted by changing the sizes of elements of the sensor according to the actual requirements. The strain hoop sensor provided by the invention has the effects and advantages that the strain hoop sensor used for measuring the hoop strain of the pipeline can measure the hoop strain of the section of the pipeline, and has high sensitivity; and moreover, the strain hoop sensor can be used for overcoming the defects of small measuring scope, low precision, high possibility of influence caused by electromagnets, poor long-term stability and the like of a resistance strain gauge.

Description

technical field [0001] The invention belongs to the field of sensing technology, and relates to a strain hoop sensor for measuring circumferential strain of a pipeline based on fiber grating technology. Background technique [0002] The current method of measuring the hoop strain of pipelines is usually to use resistance strain gauges. However, this method can only measure the local strain at the location of the strain gauge, the measurement range is small, and it cannot reflect the circumferential deformation of the entire pipeline. Moreover, the resistance strain gauge has low sensitivity, is susceptible to electromagnetic signal interference, has poor long-term stability, and has a short life. To develop a sensor for measuring the hoop strain of the pipeline which can overcome the above shortcomings. [0003] Fiber Bragg Grating has been widely used in the field of fiber optic sensing since its inception. The fiber grating sensor is a new type of sensor made of fiber gr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a strain hoop sensor for measuring the hoop strain of the pipe based on the fiber grating technology. This strain hoop sensor can be closely combined with the pipe and can measure the hoop strain of the entire pipe section, with high sensitivity and anti-interference Strong, solves the problems of the existing resistance strain gauges such as small measurement range, susceptibility to external electromagnetic interference, low measurement sensitivity, poor long-term stability, and short life

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