Abstract
We investigate a periodically micro-tapered fiber grating for simultaneous
measurement of strain and temperature. The fundamental core mode can be
coupled to the cladding mode by tapering a single-mode fiber periodically,
which results to the resonant wavelength. The coupling strength is directly
proportional to the number of micro-tapered regions in the cladding. The
transmission characteristics of the periodically micro-tapered fiber grating
are measured as strain or temperature is changed. The resonant wavelength is
shifted to shorter wavelengths and the transmission is reduced as the
applied strain increases. However, as the applied temperature increases, the
resonant wavelength is shifted to longer wavelengths and the transmission is
also diminished. Consequently, it is possible to effectively discriminate
concurrent sensitivities between strain and temperature by measuring the
resonant wavelength shift and the transmission variation of the periodically
micro-tapered fiber grating.
© 2011 IEEE
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