7 April 2008 Polymer in-fiber interferometer for large strain measurements
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We demonstrate the measurement of the phase shift in a polymethylmethacrylate (PMMA) single-mode optical fiber interferometer, operating at a wavelength of 632.8 nm, up to 15.8% nominal strain in the fiber. The phase-displacement sensitivity is measured to be 1.39 x 107 rad m-1 for this strain range. This strain range is well beyond the yield strain of the polymer fiber and that previously measured for polymer Bragg gratings and silica optical fibers. The measured phase-displacement response is then compared to a previous analytical formulation for the large deformation response of the polymer optical fiber. The formulation includes both the finite deformation of the optical fiber and potential nonlinear strain optic effects at large deformations. Using previously measured values for the linear and nonlinear mechanical response of the fiber, these nonlinear strain optic effects are estimated from the current experimental data. This estimation shows that the nonlinearities in the strain optic effect are of the same order of magnitude as those in the mechanical response of the PMMA.
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Sharon Kiesel, Sharon Kiesel, Kara Peters, Kara Peters, Tasnim Hassan, Tasnim Hassan, Mervyn Kowalsky, Mervyn Kowalsky, } "Polymer in-fiber interferometer for large strain measurements", Proc. SPIE 6933, Smart Sensor Phenomena, Technology, Networks, and Systems 2008, 69330W (7 April 2008); doi: 10.1117/12.775880; https://doi.org/10.1117/12.775880

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