Clarification of strain-temperature cross-sensitivity effect on Brillouin frequency shift in plastic optical fibers

Kazunari Minakawa; Yosuke Mizuno; Kentaro Nakamura

doi:10.1117/12.2267288

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23 April 2017 Clarification of strain-temperature cross-sensitivity effect on Brillouin frequency shift in plastic optical fibers

Kazunari Minakawa, Yosuke Mizuno, Kentaro Nakamura

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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103238U (2017) https://doi.org/10.1117/12.2267288
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

The strain-temperature cross-sensitivity effect on Brillouin frequency shift (BFS) in plastic optical fibers (POFs) is fully investigated. First, we show that the strain coefficient of the BFS is dependent on temperature. In the strain ranges of 0– 1.2% and 4.0–9.0%, the temperature dependence is linear with coefficients of 1.5 MHz/%/°C and –0.4 MHz/%/°C, respectively. We then find that the temperature coefficient of the BFS is linearly dependent on strain with a coefficient of 1.5 MHz/°C/% in the strain range from 0 to 1.2%. For 4.0–9.0% strains, the BFS basically decreases with increasing temperature. These results indicate that temperature (and strain) compensation for the strain (and temperature) sensitivity of the BFS is required to correctly detect the strain and temperature magnitude in POF-based Brillouin sensing. We also show that temperature sensing with no sensitivity to strain is potentially feasible by using POFs pre-strained for >13%.

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Kazunari Minakawa, Yosuke Mizuno, and Kentaro Nakamura "Clarification of strain-temperature cross-sensitivity effect on Brillouin frequency shift in plastic optical fibers", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238U (23 April 2017); https://doi.org/10.1117/12.2267288

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