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Four-core fiber-based bending sensor |
Shigang ZHAO1,2, Xue WANG1,2, Libo YUAN1,2( ) |
| 1. National University Science Park, Harbin Engineering University; 2. Department of Physics, Harbin Engineering University |
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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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| Keywords
fiber optics
four-core fiber
bending sensor
far field
grid pattern
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Corresponding Author(s):
YUAN Libo,Email:lbyuan@vip.sina.com
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Issue Date: 05 September 2009
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