Hou Maoxiang, Zhu Feng, Wang Ying, Wang Yiping, Liao Changrui, Liu Shen, Lu Peixiang
Opt Express. 2016 Nov 28;24(24):27890-27898. doi: 10.1364/OE.24.027890.
A gas pressure sensor based on an antiresonant reflecting guidance mechanism in a hollow-core fiber (HCF) with an open microchannel is experimentally demonstrated for gas pressure sensing. The microchannel was created on the ring cladding of the HCF by femtosecond laser drilling to provide an air-core pressure equivalent to the external environment. The HCF cladding functions as an antiresonant reflecting waveguide, which induces sharp periodic lossy dips in the transmission spectrum. The proposed sensor exhibits a high pressure sensitivity of 3.592 nm/MPa and a low temperature cross-sensitivity of 7.5 kPa/°C. Theoretical analysis indicates that the observed high gas pressure sensitivity originates from the pressure induced refractive index change of the air in the hollow-core. The good operation durability and fabrication simplicity make the device an attractive candidate for reliable and highly sensitive gas pressure measurement in harsh environments.
实验展示了一种基于具有开放微通道的空心光纤（HCF）中的反谐振反射引导机制的气体压力传感器，用于气体压力传感。通过飞秒激光钻孔在HCF的环形包层上创建微通道，以提供与外部环境等效的空心压力。HCF包层用作反谐振反射波导，在传输光谱中引起尖锐的周期性损耗下降。所提出的传感器具有3.592 nm/MPa的高压灵敏度和7.5 kPa/°C的低温交叉灵敏度。理论分析表明，观察到的高气敏性源于空心内空气的压力诱导折射率变化。良好的操作耐久性和制造简单性使该装置成为在恶劣环境中进行可靠且高灵敏度气体压力测量的有吸引力的候选者。
