公开(公告)号：US11131544B2

公开(公告)日：2021-09-28

申请号：US16087290

申请日：2017-03-23

申请人： Université de Nantes ,  Centre National de la Recherche Scientifique

发明人： Romain Guyard ,  Yann Lecieux ,  Cyril Lupi ,  Dominique Leduc

IPC分类号： G01B11/255 ,  G01B11/16

摘要： An optical fiber curvature sensor. Two networks (R1, R2) with periodic longitudinal modulation of the refractive index of the optical fiber core are inscribed in the fiber (F) one behind the other or one on top of the other. The networks are configured to respectively reflect wavelengths λ1 and λ2 such that λ1=λB+ΔλB1 and λ2=λB+ΔλB2, where λB is the Bragg wavelength of the networks and where λB1 and λB2 are shifts sensitive to the temperature, to deformations and to the curvature of the optical fiber. The two networks are defined so that the quantities ΔλB1 and ΔλB2 have substantially identical sensitivity to temperature and to deformations and substantially opposite sensitivity to curvature.