Method for manufacturing fiber grating and sensor using same

A fiber grating and sensor technology, which is applied in the field of sensing, can solve the problems of being unable to meet the actual engineering needs of simultaneously measuring the bending curvature and distinguishing the bending direction.

Inactive Publication Date: 2009-09-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 dire

Method used

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  • Method for manufacturing fiber grating and sensor using same
  • Method for manufacturing fiber grating and sensor using same
  • Method for manufacturing fiber grating and sensor using same

Examples

Experimental program
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Embodiment 1

[0046] Such as Figure 5 As shown, the photonic crystal fiber used in Embodiment 1 of the present invention is the LMA10 fiber of Crystal-FiberA / S, and its cross section is as follows Figure 5 As shown in a, it is made of pure quartz and is made by "stack-drawing" method. The optical fiber contains four layers of air holes, and the air holes are regularly arranged in a triangular array. The air hole diameter is 3.5 μm, and the air hole spacing is 7.8 μm. Since the ratio of air hole diameter to spacing is less than 0.45, the fiber only supports single-mode transmission at any wavelength. The long period fiber grating 702 is made of CO 2 The lasers are fabricated in photonic crystal fibers. The energy parameters and scanning trajectory of the laser pulse are controlled by a computer. CO 2 The repetition rate of the laser is 1000Hz, the average output power is 0.1W, and the Q-switching time is 4.2μs. The laser spot scanning speed is 3.2mm / s. The period of the fiber grati...

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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...

Claims

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Application Information

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IPC IPC(8): G02B6/02G01B11/24
Inventor 靳伟金龙陈明华张敏于秀娟廖延彪
Owner TSINGHUA UNIV
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