A novel curved long period grating(LPG) sensor based on eccentric hollow-core fiber (EHCF) is designed by high frequency CO2 laser micromachining method. The sensor is mainly composed of two parts, a large-sized EHCF and the curved LPG based on the EHCF as the carrier. The curved LPG is obtained by focusing the laser spot on the EHCF and writing along the axial direction. Comsol software was used to simulate the transmission modes supported by the EHCF. The theoretical model of the curved LPG sensor was established and samples of the curved LPG sensor were fabricated. The axial strain experiment results of the curved LPG sensor show that its sensitivity is as high as 4.5 pm/με in the range of 0 to 2500 με, and its linearity is 0.994. The sensitivity is ten times higher than that of conventional single-mode fiber LPG. The temperature change can be used to bidirectionally tune the spectrum of the C-LPG sensor. The sensor showed excellent repeatability and stability. Lead to innate and unique competitiveness in the field of stress and strain sensing.
We design and demonstrate a temperature sensor based on an ethanol-sealed double helix microfiber coupler (DHMC). The sensor consists of two intertwined microfibers with a minimum waist diameter of up to 3.4 μm. The temperature sensitivity of the DHMC can reach up to −2.03 nm / ° C in the range of 25°C to 55°C due to the thermo-optic effect of ethanol and the thermal expansions of the sealant and sealed liquid. Effects of different mechanisms on the temperature sensitivity are also investigated theoretically and experimentally. By encapsulating the coupler in a capillary, the mechanical strength and environmental anti-interference of the sensor are greatly improved. Moreover, the device with easy fabrication, compact size, and low cost is suitable for temperature measurement in most environments.
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