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Fiber Bragg Grating Sensor

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Fiber Bragg Grating Sensor

Fiber Bragg Grating (FBG) based optical fiber sensor technology enables one to measure temperature, pressure, strain, etc. at a point or on several points along several hundreds of meters of optical cable. A grating can be written at a known length where temperature, pressure, strain, or vibration whether critical are need to be determined. Its features are- it has advantages over conventional point sensors and strain gauges, and is suitable for structural health monitoring applications.

Fiber Bragg Grating (FBG) is a type of distributed reflector that reflects a particular wavelength of light and transmits all others. This is done by adding a periodic variation to the refractive index of the fiber core. A shift in wavelength is observed when the temperature or strain around grating is changed. When light is passed down the optical fiber the reflected shift in wavelength is detected and corresponding temperature, pressure or strain changed is observed.

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