Attaching and fixing device and method for magnetic fiber grating strain sensor

Abstract

The invention discloses a pasting and fixing device for a magnetic-type optical fiber and optical grating strain sensor. The pasting and fixing device comprises a separation-type magnetic-attraction fixed block, an optical fiber clamping platform and a pre-tightening force control apparatus; the separation-type magnetic-attraction fixed block is composed of two adjustable magnetic-attraction blocks; the adjustable magnetic-attraction blocks are divided into a fixed-end magnetic-attraction block and a free-end magnetic-attraction block, the bottoms of the adjustable magnetic-attraction blocks are provided with optical fiber through holes, and the optical fiber through hole of the fixed-end magnetic-attraction block is slightly less than the diameter of the optical fiber so that the optical fiber is pressed and fixed; the optical fiber through hole of the free-end magnetic-attraction block is slightly more than the diameter of the optical fiber so that the optical fiber can be freely moved in the through hole of the free-end magnetic-attraction block; the optical fiber clamping platform is used for clamping the optical fiber pigtail extended from the free-end magnetic-attraction block; the pre-tightening force control apparatus is used for driving the optical fiber clamping platform to axially move along the optical fiber. According to the device and the method, the whole optical fiber and optical grating strain sensor is independently installed and operated by one person, when the optical fiber and optical grating adhesive is applied to a solidifying process, and pre-tightening force isn't manually and continuously applied to the optical fiber and the optical grating, thus the labor strength of an operator is reduced.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and in particular relates to a sticking and fixing device and method for a magnetic absorption type optical fiber grating strain sensor. Background technique [0002] As a new type of optical sensing device, fiber Bragg grating has the advantages of high sensitivity, small size, light weight, easy bending, good corrosion resistance, strong anti-electromagnetic interference ability and easy multiplexing of ordinary fiber optic sensors. Modulation, the sensing signal will not be distorted due to loss of light intensity, is a sensor device that has developed most rapidly in the field of optical fiber sensing in recent years. The central wavelength of the fiber Bragg grating can be directly modulated by the strain, and has a good linear response, so it is an ideal strain measurement element. Nowadays, the strain measurement technology based on fiber Bragg grating has been widely used in various ...

AI Technical Summary

Problems solved by technology

However, whether the fiber grating is pasted on the substrate or directly on the surface of the object to be tested, the current pasting process is to manually tighten the fiber grating to make it close to the surface to be tested, and then apply the adhesive until it sticks. The adhesive is completely cured, and the fiber grating needs to be tightened manually throughout the whole process. The operation is difficult and often requires two people to cooperate, and it is impossible to control the pre-tightening force when the fiber grating is pasted, which seriously affects the accuracy of the fiber grating sensor when measuring strain. repeatability, repeatability, and consistency

At present, in the field of contact strain measurement technology, the bonding of strain gauges in the strain gauge electrical measurement method has a set of mature bonding tools and operating specifications, while the bonding of optical fiber gratings does not yet have a set of better tools and standardized bonding methods. Therefore, there is an urgent need to design a fiber grating sticking tool for surface strain measurement

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