Abstract
A novel four-core fiber-based bending sensor has been proposed. The four-core fiber is used as the sensing element, the four cores of the fiber act as a four-beam interferometer, and the far-field interferogram grids with periodical distributions are formed on the fiber output end. Since the phase difference is a function of the radius of curvature, the change of the radius of curvature shifts the far-field interferometric grid pattern. A low-coherence laser diode with wavelength of 650 nm is adopted to illuminate the fiber, and the interferogram pattern in the far-field is recorded by a CCD camera. The relationship between the far-field grid pattern intensity distribution and the radius of curvature is established theoretically and confirmed experimentally.
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Translated and revised from Acta Optica Sinica, 2006, 26(7): 1001–1006 [译自: 光学学报]
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Zhao, S., Wang, X. & Yuan, L. Four-core fiber-based bending sensor. Front. Optoelectron. China 1, 231–236 (2008). https://doi.org/10.1007/s12200-008-0072-7
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DOI: https://doi.org/10.1007/s12200-008-0072-7