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A new platform with thousands of fiber grating array during fiber draw is proposed for fiber-optic sensing. Ultra-weak FBG (UWFBG) array for distributed fiber-optic sensing applications is developed and experimentally demonstrated. The precise of the spacing between each adjacent UWFBGs is less than 5 mm, which is suitable for precise positioning and rapid demodulation. The experimental results show that TDM + WDM-FBG array can realize a wide range of temperature measurement with a resolution of 1 m and a sensing distance of 2 km. In addition, Φ-OTDR technology can be used to achieve distributed vibration measurement with a spatial resolution of 5 m and a distance of 5 km. Phase, amplitude, frequency response and location information can be directly obtained at the same time.
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Yang et al. (2018) studied this question.
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