Dynamic strain measurement using two wavelength-matched fiber Bragg grating sensors interrogated by a cascaded long-period fiber grating

Abstract In this work, we describe a fiber Bragg grating (FBG) sensing system using two wavelength-matched FBG sensors for static and dynamic strain measurement. A cascaded long-period fiber grating (CLPG)-based demodulation technique has been used to interrogate the two wavelength-matched FBG sensors. Experimental results of static strain measurement show that the proposed system has a strain resolution of 1 μe. This system has also been used for dynamic strain measurement. An eddy current displacement meter-based system has been used as a comparison measurement. Experimental results of dynamic strain measurement have proved that the FBG sensing system has a good performance in the measurement of dynamic strain. The results of static and dynamic strain measurement indicate that the sensing system using two wavelength-matched FBG sensors is superior to the single FBG sensor system.

[1]  Hwa-Yaw Tam,et al.  Acousto-ultrasonic sensing for delaminated GFRP composites using an embedded FBG sensor , 2009 .

[2]  P. T. Neves,et al.  Time Analysis of the Wavelength Shift in Fiber Bragg Gratings , 2007 .

[3]  Kin Seng Chiang,et al.  Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror , 2000 .

[4]  A. Kersey,et al.  Matched-filter interrogation technique for fibre Bragg grating arrays , 1995 .

[5]  Ian Bennion,et al.  Phase shifted and cascaded long-period fiber gratings , 1999 .

[6]  John P. Dakin,et al.  Simultaneous monitoring of multiple fibre gratings with a single acousto-optic tunable filter , 1996 .

[7]  Y Wang,et al.  Fiber In-Line Mach–Zehnder Interferometer Embedded in FBG for Simultaneous Refractive Index and Temperature Measurement , 2010, IEEE Photonics Technology Letters.

[8]  Zhi Zhou,et al.  Development and sensing properties study of FRP–FBG smart stay cable for bridge health monitoring applications , 2011 .

[9]  Baoli Yao,et al.  Parallel phase-shifting interferometry based on Michelson-like architecture. , 2010, Applied optics.

[10]  A. Kersey,et al.  High-resolution fibre-grating based strain sensor with interferometric wavelength-shift detection , 1992 .

[11]  A. Sombra,et al.  Add-Drop Demultiplexer Operating in an Optical Michelson Interferometer Based in Fiber Bragg Gratings for Time Division Multiple Access Systems , 2010 .

[12]  A. Kersey,et al.  Multiplexed fiber Bragg grating strain-sensor system with a fiber Fabry - Perot wavelength filter. , 1993, Optics letters.

[13]  Anand Asundi,et al.  A novel time-division multiplexing fiber Bragg grating sensor interrogator for structural health monitoring , 2009 .

[14]  Ian Bennion,et al.  All-fibre optical sensing system: Bragg grating sensor interrogated by a long-period grating , 1998 .

[15]  Jianlin Zhao,et al.  An optimized strain demodulation method based on dynamic double matched fiber Bragg grating filtering , 2011 .

[16]  Alan D. Kersey,et al.  All-fibre Bragg grating strain-sensor demodulation technique using a wavelength division coupler , 1994 .

[17]  Dragan Coric,et al.  High-speed internal strain measurements in composite structures under dynamic load using embedded FBG sensors , 2010 .