Frontiers of Optoelectronics, Volume. 1, Issue 3, 231(2008)
Four-core fiber-based bending sensor
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 farfield 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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Shigang ZHAO, Xue WANG, Libo YUAN. Four-core fiber-based bending sensor[J]. Frontiers of Optoelectronics, 2008, 1(3): 231
Received: --
Accepted: --
Published Online: Nov. 6, 2012
The Author Email: YUAN Libo (lbyuan@vip.sina.com)