Measurement of pressure and temperature sensitivities of a Bragg grating imprinted in a highly birefringent side-hole fiber.

The sensing characteristics of a Bragg grating imprinted in a specially developed highly birefringent side-hole fiber were investigated in detail. We showed that such a grating has almost identical sensitivities to temperature for both linearly polarized modes LP01(x) and LP01(y) (approximately 5.9 pm/K) and significantly different sensitivities to hydrostatic pressure (-1.93 pm/MPa for LP01(x) and +5.37 pm/MPa for LP01(y) mode). The sensitivity differences versus mode polarization are so high that this effect can be employed for simultaneous sensing of temperature and pressure by interrogation of the wavelength shifts at LP01(x) and LP01(y) modes. Applying interferometric methods, we also measured the sensitivity of the host side-hole fiber to temperature and hydrostatic pressure for each polarization mode. Our results show that there is good agreement between the normalized sensitivities of the host side-hole fiber and those of the grating for the same polarization modes.

[1]  R Ulrich,et al.  Side-hole fiber for fiber-optic pressure sensing. , 1986, Optics letters.

[2]  William W. Morey,et al.  IN-FIBER BRAGG-GRATING SENSORS , 1988 .

[3]  M. Turpin,et al.  Interfero-polarimetric fiber optic sensor for both pressure and temperature measurement , 1992, 8th Optical Fiber Sensors Conference.

[4]  L. Reekie,et al.  Optical in-fibre grating high pressure sensor , 1993 .

[5]  Wojtek J. Bock,et al.  Characterization of elliptical-core side-hole fibers for interferometric pressure sensing , 1994, Other Conferences.

[6]  K. Himeno,et al.  Simultaneous Measurement of Temperature and Strain using PANDA Fiber Grating , 1997 .

[7]  Robert J. Schroeder,et al.  High pressure and temperature sensing for the oil industry using fiber Bragg gratings written onto side hole single mode fiber , 1999, International Conference on Optical Fibre Sensors.

[8]  Tsutomu Yamate.  Thermally insensitive pressure measurements up to 300 degree C using fiber Bragg gratings written onto side hole single mode fiber , 2000, International Conference on Optical Fibre Sensors.

[9]  Kin Seng Chiang,et al.  Simultaneous pressure and temperature measurement with polymer-coated fibre Bragg grating , 2000 .

[10]  Faramarz Farahi,et al.  Simultaneous measurement of strain and temperature using interferometrically interrogated fiber Bragg grating sensors , 2000 .

[11]  S. Gupta,et al.  Bragg gratings in multimode and few-mode optical fibers , 2000, Journal of Lightwave Technology.

[12]  W. Bock,et al.  Digital demodulation system for low-coherence interferometric sensors based on highly birefringent fibers. , 2001, Applied optics.

[13]  Wojtek J. Bock,et al.  Highly sensitive fiber-optic sensor for dynamic pressure measurements , 2001, IEEE Trans. Instrum. Meas..

[14]  W. Bock,et al.  Dispersion effects in elliptical-core highly birefringent fibers. , 2001, Applied optics.

[15]  Wojtek J. Bock,et al.  Measurements of temperature and strain sensitivities of a two-mode Bragg grating imprinted in a bow-tie fibre , 2001 .

[16]  K. Bohnert,et al.  High resolution fiber laser sensor for hydrostatic pressure , 2002, 2002 15th Optical Fiber Sensors Conference Technical Digest. OFS 2002(Cat. No.02EX533).