期刊
FRONTIERS OF OPTOELECTRONICS
卷 1, 期 3-4, 页码 231-236出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s12200-008-0072-7
关键词
fiber optics; four-core fiber; bending sensor; far field; grid pattern
资金
- National Natural Science Foundation of China [60577005]
- Teaching and Research Award Program for Outstanding Young Professors in Higher Education Institute, MOE, P.R.C.
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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