D-FBG

1、Description

The fabrication of fiber Bragg grating (FBG) isgenerally realized by using ultraviolet laser and phase mask, which has greatadvantages in both difficulty and mass production. However, considering fromthe two aspects of the weak penetration of UV light and the protection of thephase mask from pollution, the general method is to peel off the coating layerof the fiber and then write, and then coating. Such fabrication process willseriously affect the mechanical properties of the fiber, so that when using thefiber grating as the strain sensor,   itis easy to break with careless handing.

In order to solve this problem, our companylaunched the drawing tower to generate fiber grating online. This processcompletely avoids the adverse effect of peeling off the coating layer. In theprocess of fiber drawing, the grating is engraved online, and the etching iscompleted before the fiber surface coating. In this way, not only themechanical properties of the optical fiber can be maintained, but also theprocess complexity of the subsequent packaging process can be simplified.

Thefiber grating produced by this process has new performance characteristics:

1）High mechanicalstrength;

2）Long life;

3） It is convenient tocascade and make grating strings according to the needs;

4） Reduce thesubsequent sensor packaging process, making the sensor products more reliable;

5） Adopt differentcoating materials according to different requirements

With the support of drawing tower, differentkinds of optical fibers can be customized according to different applicationfields, such as window light of different wavelengths, integration of differentthickness, etc.

2、Parameter