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24 January 2008Influence of birefringence dispersion on spatial resolution of a
distributed stress sensor using birefringence optical fiber
Distributed stress sensor with a scanning Michelson white light interferometer can be used to detect stress distribution
and its value by analyzing polarization mode coupling caused by stress field in PMFs (polarization maintaining fibers).
In the measurement of polarization coupling, the birefringence in sensing fiber is usually considered to be
wavelength-independent. The spatial resolution of the distributed stress sensor is invariable, when the optical source
spectrum is given. In practical measurement, however, the birefringence in PMF is related with optical wavelength, the
birefringence dispersion exists in PMF. Due to the birefringence dispersion, the spatial resolution of the distributed stress
sensor descends obviously with the fiber length increasing. In this paper, the influence of external force position and
optical source spectrum on spatial resolution in the distributed stress sensor is analyzed, while the birefringence
dispersion is considered.
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Tianhua Xu, Wencai Jing, Hongxia Zhang, Cen Huang, Kun Liu, Dagong Jia, Yimo Zhang, "Influence of birefringence dispersion on spatial resolution of a distributed stress sensor using birefringence optical fiber," Proc. SPIE 6829, Advanced Materials and Devices for Sensing and Imaging III, 68290X (24 January 2008);