Application of FBG sensors for geotechnical health monitoring, a review of sensor design, implementation methods and packaging techniques

• Published in: Sensors and actuators. A. Physical. Vol. 244; pp. 184 - 197
• Main Authors: Hong, Cheng-Yu, Zhang, Yi-Fan, Zhang, Meng-Xi, Leung, Lai Ming Gordon, Liu, Li-Qiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.06.2016
• Subjects: Design analysis; Design engineering; FBG packaging methods; Fiber Bragg grating sensors; Finite difference method; Geotechnical monitoring; Geotechnics; Mathematical models; Sensors; Slopes; Structural health monitoring; Structure monitoring; Geotechnical monitoring; Fiber Bragg grating sensors; FBG packaging methods; Structure monitoring
• ISSN: 0924-4247; 1873-3069
• DOI: 10.1016/j.sna.2016.04.033

Fiber Bragg grating (FBG) sensor has been considered as a reliable sensor for health monitoring of structural and geotechnical projects. Various types of FBG based sensors have been proposed in past few decades and employed for health monitoring of many geotechnical structures. This paper presents an overview of the recent development and application of FBG based sensors for health monitoring of several key geotechnical structures, including soil nail systems, slopes, and piles. Different sensor design, implementation and packaging methods, advantages and limitations of using FBG based sensors in different projects are reviewed. Comparative analysis of using two mathematical methods for the prediction of ground movement using FBG sensor data are also carried out. The two typical mathematical methods include Finite Difference Method (FDM) and Numerical Integration method (NIM). Possible technical challenges of applying FBG sensors for geotechnical monitoring are discussed.