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Temperature-insensitivity gas pressure sensor based on inflated long period fiber grating inscribed in photonic crystal fiber

机译：基于光子晶体光纤中充胀的长周期光纤光栅的温度不敏感气压传感器

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摘要

We demonstrated an inflated long period fiber grating (I-LPFG) inscribed in a pure-silica photonic crystal fiber (PCF) for high-sensitivity gas pressure sensing applications. The I-LPFG was inscribed by use of the pressure-assisted CO2 laser beam-scanning technique to inflate periodically air holes of a PCF along the fiber axis. Such an I-LPFG with periodic inflations exhibits a very high gas pressure sensitivity of 1.68 nm/MPa, which is one order of magnitude higher than that, i.e., 0.12 nm/Mpa, of the LPFG without periodic inflations. Moreover, the I-LPFG has a very low temperature sensitivity of 3.1 pm/degrees C due to the pure silica material in the PCF so that the pressure measurement error, resulting from the cross-sensitivity between temperature and gas pressure, is less than 1.8 Kpa/degrees C in the case of no temperature compensation. So the I-LPFG could be used to develop a promising gas pressure sensor, and the achieved pressure measurement range is up to 10 MPa. (C) 2015 Optical Society of America
机译：我们展示了一种充气式长周期光纤光栅（I-LPFG），该光栅刻在纯石英光子晶体光纤（PCF）中，用于高灵敏度气压检测应用。 I-LPFG是通过使用压力辅助CO2激光束扫描技术来刻划的，以使PCF的气孔沿纤维轴周期性膨胀。具有周期性膨胀的这种I-LPFG表现出非常高的气压灵敏度，为1.68nm / MPa，这比没有周期性膨胀的LPFG的气压灵敏度高一个数量级，即0.12nm / Mpa。此外，由于PCF中的纯二氧化硅材料，I-LPFG的温度灵敏度非常低，仅为3.1 pm /℃，因此，由温度和气压之间的交叉灵敏度引起的压力测量误差小于1.8。如果没有温度补偿，则为Kpa /℃。因此，I-LPFG可用于开发有前途的气压传感器，并且实现的压力测量范围可达10 MPa。 （C）2015年美国眼镜学会

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