Photonics Research Group, Dipartimento di Ingegneria Elettrica e dell'Informazione, Politecnico di Bari, via E. Orabona n., 4, 70125 Bari, Italy.
QOpSyS SRL, Via Matteotti 23, Gioia del Colle, 70023 Bari, Italy.
Sensors (Basel). 2018 Sep 15;18(9):3115. doi: 10.3390/s18093115.
Fibre Bragg grating (FBG) strain sensors are not only a very well-established research field, but they are also acquiring a bigger market share due to their sensitivity and low costs. In this paper we review FBG strain sensors with high focus on the underlying physical principles, the interrogation, and the read-out techniques. Particular emphasis is given to recent advances in highly-performing, single head FBG, a category FBG strain sensors belong to. Different sensing schemes are described, including FBG strain sensors based on mode splitting. Their operation principle and performance are reported and compared with the conventional architectures. In conclusion, some advanced applications and key sectors the global fibre-optic strain sensors market are envisaged, as well as the main market players acting in this field.
光纤布拉格光栅（FBG）应变传感器不仅是一个非常成熟的研究领域，而且由于其灵敏度和低成本，也在获得更大的市场份额。本文重点介绍了 FBG 应变传感器的基本物理原理、解调以及读出技术。特别强调了高性能单头 FBG 的最新进展，这是 FBG 应变传感器所属的一个类别。描述了不同的传感方案，包括基于模式分裂的 FBG 应变传感器。报告了它们的工作原理和性能，并与传统结构进行了比较。最后，展望了全球光纤应变传感器市场的一些先进应用和关键领域，以及该领域的主要市场参与者。
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