Fiber grating strain sensibilization sensor

Abstract

The invention discloses a fiber grating strain sensibilization sensor, which comprises a fiber grating and an elastic sensitization substrate. The fiber grating is fixedly arranged on the elastic sensitization substrate; and the fiber tails at the two ends of the fiber grating are respectively sleeved by a fiber protection sleeve. The elastic sensitization substrate comprises a fiber grating fixation mechanism and a lever sensibilization mechanism, which are in an integrated structure. The fiber grating fixation mechanism is provided with two sections of semicircular fine grooves. The two sections of semicircular fine grooves are used for fixing the fiber grating and the fiber protection sleeves, and under the condition that the fiber grating is suspended between the two sections of semicircular fine grooves, fixation is realized by applying a pretightening force and through a fiber fixation coating layer; and by changing the structure size of the lever sensibilization mechanism, adjustment of the sensibilization effect is realized. The fiber grating strain sensibilization sensor has higher strain sensibilization coefficient, and the strain sensitivity thereof is 5-6 times higher than that of a bare fiber grating; and meanwhile, the fiber grating strain sensibilization sensor is simple in structure and convenient to install, has higher consistency and reliability and can be used repeatedly.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber grating strain-intensified sensor. Background technique [0002] In industries such as aerospace, engineering machinery, and building structures, it is impossible to do without the mechanical analysis of structures, and strain—a vital physical quantity in engineering mechanics—is often used as a tool for health monitoring, damage identification and new research of structures. Key parameters in material performance testing are tested. The existing strain detection methods mainly include resistive strain gauges and piezoelectric strain gauges. Although the installation method of the main body of the strain gauge is simple, the wiring of the strain gauge is complicated, and the number of wiring is huge during multi-point measurement, which is susceptible to electromagnetic interference. [0003] As a new type of sensing component, fiber grating has br...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a fiber grating strain-intensified sensor that can effectively improve the measurement accuracy and sensitivity for the defects of low sensitivity and low measurement accuracy of the fiber grating strain sensor in the prior art

Images