Structures and Applications of Fiber Bragg Grating Sensors

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Ⅰ. Learn about fiber Bragg grating sensors

Fiber Bragg grating sensor can be used as a kind of fiber sensor. Like the optical fiber sensor, it has many irreplaceable advantages compared with the traditional electric sensor, such as: no electromagnetic interference, lightweight, small size, no corrosion, etc. Fiber Bragg grating sensorsare commonly used in structural deformation and temperature monitoring. Short-period fiber grating sensors are commonly used, and their reflection wavelengths are called Bragg wavelengths. Such sensors are called FBG sensors.

Fiber Bragg grating sensor is a kind of fiber sensor with the highest frequency and the widest range, which includes FBG strain sensor, FBG temperature sensor, fiber Bragg grating pressure sensor, etc. This sensor can change the wavelength of the reflected light wave according to the environmental temperature and changes. Fiber bragg grating sensors use holographic interferometry or phase masking to expose a small section of light-sensitive optical fiber to light waves with a periodic distribution of light intensity. In this way, the optical refractive index of the optical fiber will be permanently changed according to the intensity of the irradiated light wave. The periodic changes in the refractive index of light caused by this method are called fiber Bragg gratings.

Ⅱ. The structure of fiber Bragg grating sensors

The structure of the fiber Bragg grating sensor is to use an ultraviolet laser to write a section of grating on the fiber core. When the continuous broadband light Li emitted by the light source enters through the transmission fiber, a narrowband light Lr is selectively reflected back at the grating, and the remaining broadband light Lt continues to pass through, and is reflected at the next grating with different center wavelengths. The grating array forms a fiber Bragg grating (FBG) sensor network. The center wavelength of the reflected light of each FBG is λ, λ=2nΛ, where n is the effective refractive index of the core; Λ is the modulation period of the core refractive index.

Ⅲ. Application of fiber Bragg grating sensors

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