2Optical Fiber Bragg Grating Sensing Technology

2.1 Principle of Fiber Bragg Grating Sensing

Fiber Bragg grating (FBG) sensor is the most widely used and researched optical fiber sensor at present. In the whole FBG, the period and the refractive index variation are uniform. The Bragg wavelength is

(2.1)lamda Subscript upper B Baseline equals 2 n normal upper Lamda

where Λ is the period of FBG and n is the effective refractive index of the fiber core. The external disturbance such as strain will cause the change of the refractive index and the period of FBG and then will make the Bragg wavelength of FBG to change. The change information to be measured can be obtained by measuring the change of Bragg ...

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