通过化学镀的方法,在光纤光栅表面得到了不同厚度的均匀金属镍镀层。由于材料热膨胀系数的差异,金属镍镀层将会在光栅内部形成内应力,这种内应力将随着镀层厚度的改变而改变。理论上分析了金属镀层的厚度对光栅中心波长漂移的影响,获得相关的理论曲线;实验上通过对化学镀镍全过程光纤光栅反射光谱的在线监测,获得了不同镀镍层厚度的光纤光栅中心波长的改变量,实验数据与理论分析结果吻合较好。 Through the electroless plating method, a uniform thickness of the metal nickel coating on the surface of the fiber grating is obtained. Due to the difference in thermal expansion coefficient of the material, the metallic nickel coating will form an internal stress in the grating, which will change as the thickness of the coating changes. Theoretical analysis of the influence of the thickness of the metal coating on the shift of the center wavelength of the grating to obtain the relevant theoretical curve; experimentally, by the online monitoring of the whole spectrum of electroless nickel plating fiber grating reflection spectra, the center of the fiber grating with different Ni plating thickness The change of wavelength, experimental data and theoretical analysis agree well.