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Poly(pentafluorostyrene) (PPFS), which can be easily synthesized and has a low optical loss window at 850nm, is a promising alternative for a costly perfluorinated polymer as a base material of polymer optical fibers (POFs). To investigate the potential of a PPFSPOF as a Brillouin-based temperature sensing fiber, the Brillouin frequency shift and its temperature dependence of PPFS were measured using an ultrasonic pulse-echo technique. The temperature coefficient, which determines the sensitivity of the temperature sensing, was approximately !7.1MHz/K independently of the molecular weight and was nearly identical to that in perfluorinated POFs.

ieice electronics express

Dependence of Brillouin frequency shift on temperature in poly(pentafluorostyrene)-based polymer optical fibers estimated by acoustic velocity measurement