By incorporating a Sagnac birefringence loop composed of a 3.9-or 5.2-cm-long polarization-maintaining photonic crystal fiber, we demonstrated a temperature-insensitive polarimetric fiber strain sensor with a reduced length of the sensing fiber. The sensing fiber is shortened by more than two times compared with the shortest sensing fiber used in other previous works for localized sensing and sensor compactness. With a 3.9-cmlong sensing fiber, a strain sensitivity of 2:34 pm/" was obtained in a measurement range of 0-10 m". Temperature sensitivity was measured as 21:7 pm/ C, significantly lower than that of the conventional PMF. #
In this paper we have implemented a temperature-insensitive polarimetric fiber strain sensor based on a Sagnac birefringence interferometer composed of a short polarization-maintaining photonic crystal fiber (PM-PCF), a 3-dB fiber coupler, and polarization controllers. The PM-PCF used as a sensor head was 2 cm long, which is the shortest length for a sensing element compared to other polarimetric fiber strain sensors using a PM-PCF. The proposed sensor showed a strain sensitivity of ~0.87 pm/με with a strain measurement range from 0 to 8 mε. The temperature sensitivity was also investigated and measured as approximately -12 pm/℃, when ambient temperature changed from 30 to 100℃. This temperature sensitivity is about 82 times smaller than that of conventional polarization-maintaining fiber (approximately -990 pm/℃). In particular, from a practical perspective we have experimentally and theoretically confirmed that the wavelength selected for the indicator dip location does not make a significant difference in the strain sensitivity.
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