Journal
APPLIED PHYSICS LETTERS
Volume 90, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2722058
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A fiber-optic strain sensor is demonstrated by using a short length of polarization-maintaining photonic crystal fiber (PM-PCF) as the sensing element inserted in a Sagnac loop interferometer. Spectrum shift in response of strain with a sensitivity of 0.23 pm/mu epsilon is achieved, and the measurement range, by stretching the PM-PCF only, is up to 32 m epsilon. Due to the ultralow thermal sensitivity of the PM-PCF, the proposed strain sensor is inherently insensitive to temperature, eliminating the requirement for temperature compensation. (c) 2007 American Institute of Physics.
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