TY - JOUR
T1 - Fiber-optic pressure sensor based on π-phase-shifted fiber Bragg grating on side-hole fiber
AU - Zhang, Qi
AU - Liu, Nan
AU - Fink, Thomas
AU - Li, Hong
AU - Peng, Wei
AU - Han, Ming
N1 - Funding Information:
Manuscript received May 9, 2012; revised June 25, 2012; accepted June 30, 2012. Date of publication August 2, 2012; date of current version August 8, 2012. This work was supported in part by the U.S. Office of Naval Research under Grant N000141110262 and in part by the U.S. National Science Foundation under Grant EPS-1004094. The work of H. Li and W. Peng was supported in part by the National Natural Science Foundation of China under Grant 60977055 and Grant 61137005.
PY - 2012
Y1 - 2012
N2 - We present a fiber-optic pressure sensor based on a π-phase-shifted fiber Bragg grating (π FBG) fabricated on a side-hole fiber. Due to the resonance effect of a πFBG, its reflection spectrum features two notches that are dramatically narrower than the linewidth of a regular FBG of similar length. The narrow spectral notches allow high-resolution measurement of their spectral separation, significantly improving the pressure detection limit (defined herein as the minimum detectable pressure change) compared to sensors based on a regular FBG of a similar length and on the same fiber. The π FBG demonstrated in this letter is 8.3 mm long and the linewidth of each spectral notch is only 3.6 pm, corresponding to a quality factor of 4.3 × 10 5. The spectral notch separation exhibited a sensitivity of 20 pm/kpsi to pressure, which was limited by the geometry of the fiber holes, and little sensitivity to temperature. The Bragg wavelength shift exhibited a sensitivity of 11.4 pm/°C to temperature. In practice, a spectral resolution of 0.028 pm can be easily achieved for the πFBG demonstrated in this letter, leading to a pressure detection limit of 1.4 psi and a temperature detection limit of 0.0025°C.
AB - We present a fiber-optic pressure sensor based on a π-phase-shifted fiber Bragg grating (π FBG) fabricated on a side-hole fiber. Due to the resonance effect of a πFBG, its reflection spectrum features two notches that are dramatically narrower than the linewidth of a regular FBG of similar length. The narrow spectral notches allow high-resolution measurement of their spectral separation, significantly improving the pressure detection limit (defined herein as the minimum detectable pressure change) compared to sensors based on a regular FBG of a similar length and on the same fiber. The π FBG demonstrated in this letter is 8.3 mm long and the linewidth of each spectral notch is only 3.6 pm, corresponding to a quality factor of 4.3 × 10 5. The spectral notch separation exhibited a sensitivity of 20 pm/kpsi to pressure, which was limited by the geometry of the fiber holes, and little sensitivity to temperature. The Bragg wavelength shift exhibited a sensitivity of 11.4 pm/°C to temperature. In practice, a spectral resolution of 0.028 pm can be easily achieved for the πFBG demonstrated in this letter, leading to a pressure detection limit of 1.4 psi and a temperature detection limit of 0.0025°C.
KW - fiber Bragg grating (FBG)
KW - microstructure fiber
KW - optical fiber sensor
KW - pressure measurement
KW - π-phase-shifted fiber Bragg grating (πFBG)
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U2 - 10.1109/LPT.2012.2207715
DO - 10.1109/LPT.2012.2207715
M3 - Article
AN - SCOPUS:84865228578
SN - 1041-1135
VL - 24
SP - 1519
EP - 1522
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 17
M1 - 6257419
ER -