Simultaneous measurement of strain and temperature with a long-period fiber grating inscribed Sagnac interferometer

Abstract A Sagnac interferometer with a long-period fiber grating (LPG) inscribed in the polarization-maintaining fiber (PMF) is proposed and experimentally demonstrated for simultaneous measurement of strain and temperature. Due to the different responses of the LPG and the Sagnac interferometer to strain and temperature, simultaneous measurement can be achieved by monitoring the wavelength shifts and the intensity changes of a resonance dip of the sensor setup. The experimental results show that the achieved sensitivities to strain and temperature are 6.4 × 10 − 3  dB/μe and 0.65 nm/°C, respectively.

[1]  R O Claus,et al.  Simultaneous strain and temperature measurement with long-period gratings. , 1997, Optics letters.

[2]  J.L. Santos,et al.  Simultaneous Measurement for Strain and Temperature Based on a Long-Period Grating Combined With a High-Birefringence Fiber Loop Mirror , 2006, IEEE Photonics Technology Letters.

[3]  Jose Luis Santos,et al.  Simultaneous measurement of temperature and strain based on arc-induced long-period fibre gratings , 2005 .

[4]  Jie Zeng,et al.  [Simultaneous discriminating measurement of temperature and strain based on a long period grating's spectrum]. , 2010, Guang pu xue yu guang pu fen xi = Guang pu.

[5]  Patrice Mégret,et al.  Simultaneous strain and temperature sensor based on the numerical reconstruction of polarization maintaining fiber Bragg gratings , 2006 .

[6]  Xinhuan Feng,et al.  High-birefringence fiber loop mirrors and their applications as sensors. , 2005, Applied optics.

[7]  Hwa-Yaw Tam,et al.  Temperature-insensitive strain sensor with polarization-maintaining photonic crystal fiber based Sagnac interferometer , 2007 .

[8]  Hwa-Yaw Tam,et al.  Simultaneous strain and temperature measurement using a superstructure fiber Bragg grating , 2000 .

[9]  Hwa-Yaw Tam,et al.  Temperature-independent fiber Bragg grating tilt sensor , 2004 .

[10]  J M Baptista,et al.  Simultaneous measurement of multiparameters using a Sagnac interferometer with polarization maintaining side-hole fiber. , 2008, Applied optics.