title: Realization of nano static strain sensing with fiber Bragg gratings interrogated by narrow linewidth tunable lasers.
abstract: Aiming at realizing a static strain sensor of nano-strain resolution, which is required in most geophysical applications, this paper presents a thorough analysis on the strain resolution of a fiber Bragg grating (FBG) static strain sensor interrogated with a narrow linewidth tunable laser. The main noise sources of the sensor are discussed, and the strain resolution is deduced with a cross-correlation algorithm. The theoretical prediction agrees well with our experimental result, and the analysis is further validated by numerical simulations. Based on the analysis, the paper provides the guidelines for optimizing this type of sensor to realize ultra-high resolution. It is shown that with properly designed FBGs and interrogation systems, nano static strain resolution can be realized, as we recently demonstrated in experiment.
authors: Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors: Qingwen
authors: Q
authors: Liu
authors: Tomochika
authors: T
authors: Tokunaga
authors: Zuyuan
authors: Z
authors: He
mesh_terms: D000465:Algorithms; D015374:Biosensing Techniques; D003198:Computer Simulation; D004867:Equipment Design; D005336:Fiber Optic Technology; D005844:Geology / Q000379:methods; D007834:Lasers; D008027:Light; D008422:Materials Testing; D015233:Models, Statistical; D008962:Models, Theoretical; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D055100:Optical Fibers; D013696:Temperature; D013997:Time Factors