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提出了一种基于Sagnac干涉仪的保偏光子晶体光纤(PM-PCF)氢气传感器,建立了传感模型并进行了实验研究和验证。采用对靶磁控溅射技术将钯银(Pd/Ag)合金快速均匀地沉积在保偏光子晶体光纤侧面,并利用Pd吸收氢气后的形变调制保偏光子晶体光纤的双折射,通过测量Sagnac干涉仪输出光谱峰值的变化实现氢气浓度的测量。实验结果表明该传感器可检测的氢气浓度范围为0%~4%,且具有良好的重复性。室温下对低浓度氢气具有较高的灵敏度,氢气浓度由0%变化到1%时的波长偏移量达1.307nm。采用双折射温度不敏感的保偏光子晶体光纤,可很好地抑制外界温度变化对传感器的干扰。
A polarization maintaining photonic crystal fiber (PM-PCF) hydrogen sensor based on Sagnac interferometer was proposed. The sensing model was established and experimentally studied and verified. The Pd / Ag alloy was quickly and uniformly deposited on the side of the polarization-maintaining photonic crystal fiber by target magnetron sputtering and the birefringence of polarization-maintaining photonic crystal fiber was measured by the deformation of Pd after it was absorbed by hydrogen. By measuring the Sagnac Interferometer output spectral peak changes in the realization of hydrogen concentration measurement. Experimental results show that the sensor can detect hydrogen concentration range of 0% to 4%, and has good repeatability. At room temperature for low concentrations of hydrogen has a higher sensitivity, hydrogen concentration changes from 0% to 1% when the wavelength shift of 1.307nm. The use of polarization-insensitive polarization-maintaining photonic crystal fiber, can be very good to suppress changes in the external temperature sensor interference.