Abstract
Fiber Bragg grating (FBG) array is a powerful technique for quasi-distributed sensing along the entire length of sensing fiber with fast response and high precision. It has been widely used for temperature, strain, and vibration monitoring. In this review work, an overview on the recent advances of FBG arrays is conducted. Firstly, the fabrication methods of FBG array are reviewed, which include femtosecond laser system and online writing technique. Then, the demodulation techniques for FBG arrays are presented and discussed. Distributed static sensing can be performed by demodulating wavelength shift of each FBG, while phase demodulation techniques with low noise are employed for dynamic vibration sensing. Simultaneous distributed dynamic and static sensing system based on FBG array is also outlined. Finally, possible future directions are discussed and concluded. It is believed that the FBG array has great development potential and application prospect.
Highlights
Distributed optical fiber sensors can be employed to measure many parameters through the changes of light propagating in the optical fiber such as intensity, phase, wavelength, and polarization
We provide an overview of some of the recent advances of research in the area of quasi-distributed sensing based on the Fiber Bragg grating (FBG) array
Femtosecond laser can inscribe a series of weak reflectors, which can improve the signal-to-noise ratio (SNR) of the system, but it takes a lot of time to make a weak reflectors array
Summary
Article type: Review signal-to-noise ratio (SNR), resulting in a long response time. The amplification technology can be employed to improve the intensity of the backscatter, but it will amplify the noise, which is not beneficial to the SNR of the system [16]. On-line writing technique is an effective way for preparing identical and weak FBG arrays This technology uses ultraviolet laser to inscribe the grating continuously during the fiber drawing process. Such method can produce FBG arrays without fiber splicing, which can greatly enhance the multiplexing capacity of FBG arrays. In the last couple of years, progress in FBG array fabrication, in particular the manufacturing of on-line writing gratings [21], has given a boost to quasi-distributed multi-point sensing of temperature and strain on a large scale [22]. Quasi-distributed sensing based on the FBG array undergoes rapid development over recent years and reaches its unprecedented peak. The possible future development and application of FBG array are concluded boldly, considering the current situation
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