Title :
Hybrid fiber Bragg grating/long period fiber grating sensor for strain/temperature discrimination
Author :
Patrick, H.J. ; Williams, G.M. ; Kersey, A.D. ; Pedrazzani, J.R. ; Vengsarkar, A.M.
Author_Institution :
Div. of Opt. Sci., Naval Res. Lab., Washington, DC, USA
Abstract :
We demonstrate a novel sensor which uses the difference in strain and temperature response of fiber Bragg gratings and a long period fiber grating to discriminate between strain and temperature induced wavelength shifts. Sensor interrogation is performed entirely on the fiber Bragg grating reflection signals. Strain and temperature were simultaneously measured to /spl plusmn/9 μstrain and /spl plusmn/1.5/spl deg/C over a wide range of conditions.
Keywords :
diffraction gratings; fibre optic sensors; optical fibres; strain measurement; strain sensors; temperature measurement; temperature sensors; fiber Bragg grating reflection signals; fiber Bragg gratings; fibre sensors; hybrid fiber Bragg grating; long period fiber grating; long period fiber grating sensor; sensor interrogation; strain discrimination; strain induced wavelength shifts; strain measurement; strain response; temperature discrimination; temperature induced wavelength shifts; temperature measurement; temperature response; Bragg gratings; Capacitive sensors; Fiber gratings; Optical fiber sensors; Reflection; Strain measurement; Temperature distribution; Temperature measurement; Temperature sensors; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
