Protecting method of optical-fiber grating sensor attached to surface of composite-material structure

Abstract

The invention relates to a protecting method an optical-fiber grating sensor and belongs to the technical field of optical fiber sensing and structure health monitoring. The protecting method includes: fixing a composite-material laminated board (2) to a workbench; sleeving protective sleeves (4) at two ends of the optical-fiber grating sensor (5), placing the optical-fiber grating sensor (5) on the surface of the composite-material laminated board, allowing the sleeves to extend into the end face of the composite-material laminated board at a certain distance, using quick-drying glue to fix optical fibers and the sleeves, and evenly coating the surface of the composite-material laminated board with adhesive mu mm in thickness to fix the optical fibers (3) and the protective sleeves; neatly laying glass fiber cloth on the adhesive, mounting putty strips on the periphery of the fiber cloth, fixing a thin film special for vacuumizing with the putty strips, and vacuumizing the whole glass fiber cloth surface with a vacuumizing device under normal temperature until the relative vacuum degree reaches -0.1MPa; curing the whole structure for gamma hours under normal temperature. Compared with the prior art, the protecting method has the advantages that the method is simple in process flow and little in influence on the mechanical performance and assembling of composite-material structural components.

Description

technical field [0001] The invention relates to a method for protecting an optical fiber grating sensor surface-mounted on a composite material structure, and belongs to the technical field of optical fiber sensing and structural health monitoring. Background technique [0002] With the continuous development of fiber optic sensor technology, fiber grating sensors are more and more widely used in engineering measurement. Compared with traditional sensors, it has many advantages of its own, such as small size, small energy loss during transmission, wavelength division multiplexing and distributed sensing, high temperature resistance, corrosion resistance, no electromagnetic interference, and can work in harsh environments Wait. [0003] Due to the small size of the fiber sensor (155 μm), it is easy to embed in the composite material. In recent years, the fiber grating sensor has been gradually used in the health detection of composite material structures and the field of int...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that internal defects will be introduced when the fiber grating sensor is embedded in the composite material for structural health monitoring, which will affect the structural performance of the composite material itself. On the one hand, in order to solve the problems that when the fiber grating sensor is installed on the surface of the composite material structure with the traditional adhesive, the adhesive has poor anti-aging performance, the installation process is difficult to control, the operation is cumbersome, and it is easy to be damaged when the environment is harsh. The fiber grating sensor protection method realizes the close combination and protection of the fiber grating sensor and the composite material structure, and can also monitor the health status of the composite material structure in real time, reducing scheduled weekly inspections, and maintaining according to the monitoring results, reducing manpower. , financial and material input, and at the same time avoid personnel safety accidents and economic losses caused by structural failures

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