Method for manufacturing fiber grating and sensor using same

Abstract

The invention relates to a fiber grating sensor, comprising a broadband light source, a photonic crystal optical fiber, a spectrum acquiring module and a data processing module, wherein, the broadband light source is used for providing light source to the spectrum acquiring module; the two end of the photonic crystal optical fiber are connected with the broadband light source and the spectrum acquiring module with a single mode optical fiber, and the photonic crystal optical fiber is provided with an asymmetric long period fiber grating for sensing the bending deflection of a object which is to be measured; the spectrum acquiring module is used for acquiring the information of the bending deflection; the data processing module is used for analyzing and processing the acquired information of the bending deflection so as to finally obtain the curvature and the bending direction of the bending deflection. The invention can simultaneously measure curvature value and positive / negative direction.

Description

technical field [0001] The invention relates to sensing technology, in particular to a fiber grating sensor capable of simultaneously measuring the curvature and bending direction of one-dimensional bending in a photonic crystal fiber. Background technique [0002] In recent years, photonic crystal fibers have attracted a lot of attention. Unlike traditional optical fibers, photonic crystal fibers are composed of only one material (usually pure silica). The cross-section of this fiber consists of three parts: core, inner cladding, and outer cladding. Both the core and the outer cladding are made of pure quartz, and the inner cladding introduces a regularly arranged array of air holes on the pure quartz substrate, in which the size of each air hole and the spacing between adjacent air holes are the same, and the diameter d of the air holes and the spacing Λ is generally several microns. A plurality of air holes are arranged in a triangular array, and the air hole array is g...

AI Technical Summary

Problems solved by technology

However, the traditional fiber grating has a circular symmetric structure, and its response (resonance wavelength shift condition) is basically the same when the grating is bent in any direction

This feature makes the traditional fiber grating unable to meet the actual engineering needs of simultaneously measuring the bending curvature and distinguishing the bending direction

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