A linearity interrogation technique with enlarged dynamic range for fiber Bragg grating sensing

An exact linearity interrogation technique with enlarged dynamic range for fiber Bragg grating (FBG) sensor has been analyzed theoretically and demonstrated experimentally. The technique bases on two matched FBGs for receiving the reflected signal from the sensor FBG and two photodiodes (PDs) for collecting the reflected signal from the two receiver FBGs. The linear expression between the nature logarithm of the output ratio of the two PDs and Bragg wavelength of the sensor FBG is obtained on the condition that the bandwidths of the two receiver FBGs being equal to each other. The wavelength of the sensor FBG can be interrogated simply and accurately by the linearity technique according to the expression. In addition, a new tunable paralleled matched gratings interrogation scheme is proposed. The interrogation range can be enlarged and multiple FBG sensors can be interrogated simultaneously with the tunable interrogation scheme.

[1]  Ian Bennion,et al.  Fiber Bragg grating sensor interrogation using chirped fiber grating-based Sagnac loop , 2003 .

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

[3]  G. Ball,et al.  Fiber laser source/analyzer for Bragg grating sensor array interrogation , 1994 .

[4]  L. Reekie,et al.  Novel interrogating system for fibre Bragg grating sensors using an acousto-optic tunable filter , 1993 .

[5]  Alan D. Kersey,et al.  Application of a fiber Fourier transform spectrometer to the detection of wavelength-encoded signals from Bragg grating sensors , 1995 .

[6]  Michael A. Davis,et al.  Fiber grating sensors , 1997 .

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

[8]  D. Jackson,et al.  Analysis of the reflective-matched fiber Bragg grating sensing interrogation scheme. , 1997, Applied optics.

[9]  Haiwen Cai,et al.  A fiber Bragg grating with triangular spectrum as wavelength readout in sensor systems , 2004 .

[10]  T. Yoshino,et al.  Fast optical wavelength interrogator employing arrayed waveguide grating for distributed fiber Bragg grating sensors , 2003 .

[11]  Zhiyi Zhang,et al.  Arrayed-waveguide-grating-based interrogator for wavelength-modulated multi-fiber-optic sensor applications , 2005 .

[12]  D. Jackson,et al.  Simple multiplexing scheme for a fiber-optic grating sensor network. , 1993 .

[13]  Byoungho Lee,et al.  Fiber Bragg grating strain sensor demodulator using a chirped fiber grating , 2001 .

[14]  R. Measures,et al.  A passive wavelength demodulation system for guided-wave Bragg grating sensors , 1992, IEEE Photonics Technology Letters.

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

[16]  Xiufeng Yang,et al.  FBG sensor interrogation with high temperature insensitivity by using a HiBi-PCF Sagnac loop filter , 2005 .

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

[18]  Yanbiao Liao,et al.  Discrimination methods and demodulation techniques for fiber Bragg grating sensors , 2004 .

[19]  Hypolito José Kalinowski,et al.  Highly reliable strain-tuning of an Erbium-doped fiber laser for the interrogation of multiplexed Bragg grating sensors , 2007 .

[20]  Donal A. Flavin,et al.  Short-scan interferometric interrogation and multiplexing of fibre Bragg grating sensors , 1999 .

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

[22]  Sailing He,et al.  Interrogation technique for a fiber Bragg grating sensing array based on a Sagnac interferometer and an acousto-optic modulator. , 2008, Optics letters.

[23]  Zhiyi Zhang,et al.  Modeling of arrayed waveguide grating for wavelength interrogation application , 2007 .

[24]  Xu Guang Huang,et al.  A novel fiber Bragg grating interrogating sensor system based on AWG demultiplexing , 2007 .

[25]  Wei Jin,et al.  A cheap and practical FBG temperature sensor utilizing a long-period grating in a photonic crystal fiber , 2007 .

[26]  Ian Bennion,et al.  Identical broadband chirped grating interrogation technique for temperature and strain sensing , 1997 .

[27]  Yage Zhan,et al.  Multiplexed reflective-matched optical fiber grating interrogation technique , 2007 .