Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6535
Title: Fourier analysis for hydrostatic pressure sensing in a polarization-maintaining photonic crystal fiber
Authors: Childs, P
Wong, ACL
Fu, HY
Liao, YB
Tam, HY 
Lu, C 
Wai, PKA 
Keywords: Birefringence
Crystal whiskers
Fourier analysis
Hydraulics
Hydrodynamics
Hydrostatic pressure
Photonic crystal fibers
Photonic crystals
Issue Date: 20-Dec-2010
Publisher: Optical Society of America
Source: Applied optics, 20 Dec. 2010, v. 49, no. 36, p. 6861-6867 How to cite?
Journal: Applied optics 
Abstract: We measured the hydrostatic pressure dependence of the birefringence and birefringent dispersion of a Sagnac interferometric sensor incorporating a length of highly birefringent photonic crystal fiber using Fourier analysis. Sensitivity of both the phase and chirp spectra to hydrostatic pressure is demonstrated. Using this analysis, phase-based measurements showed a good linearity with an effective sensitivity of 9:45 nm/MPa and an accuracy of ±7:8 kPa using wavelength-encoded data and an effective sensitivity of -55:7cm⁻¹/MPa and an accuracy of ±4:4 k Pa using wavenumber-encoded data. Chirp-based measurements, though nonlinear in response, showed an improvement in accuracy at certain pressure ranges with an accuracy of ±5:5 kPa for the full range of measured pressures using wavelength-encoded data and dropping to within ±2:5 kPa in the range of 0.17 to 0:4 MPa using wavenumber-encoded data. Improvements of the accuracy demonstrated the usefulness of implementing chirp-based analysis for sensing purposes.
URI: http://hdl.handle.net/10397/6535
ISSN: 1559-128X
EISSN: 2155-3165
DOI: 10.1364/AO.49.006861
Rights: © 2010 Optical Society of America. This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-36-6861. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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