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In polarization-maintaining fiber (PMF) sensors, the detected coupling intensity descends obviously with increments of the transmission distance. A long PMF of more than 500 m is tested, the phenomenon of intensity attenuation is investigated experimentally, and a modified method with a reference point is proposed to measure the coupling intensity accurately. The experimental results show that the...
Distributed stress sensor with a white-light scanning interferometer is used to detect stress distribution by analyzing polarization mode coupling caused by forces exerted on PMFs (polarization maintaining fibers). In measurement of polarization coupling, the birefringence in sensing fiber is usually considered to be wavelength independent. Sensitivity and spatial resolution of the distributed stress...
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