Photonics research center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Faculty of Science, Engineering and Technology, Swinburne University of Technology, John Street, Hawthorn, VIC 3122, Australia.
Sci Rep. 2018 Jan 8;8(1):65. doi: 10.1038/s41598-017-18245-6.
This paper presents a sensitive and large dynamic range pressure sensor based on a novel birefringence microstructured optical fiber (MOF) deployed in a Sagnac interferometer configuration. The MOF has two large semicircle holes in the cladding and a rectangular strut with germanium-doped core in the center. The fiber structure permits surrounding pressure to induce large effective index difference between the two polarized modes. The calculated and measured group birefringence of the fiber are 1.49 × 10, 1.23 × 10, respectively, at the wavelength of 1550 nm. Experimental results shown that the pressure sensitivity of the sensor varied from 45,000 pm/MPa to 50,000 pm/MPa, and minimum detectable pressure of 80 Pa and dynamic range of better than 116 dB could be achieved with the novel fiber sensor. The proposed sensor could be used in harsh environment and is an ideal candidate for downhole applications where high pressure measurement at elevated temperature up to 250 °C is needed.
本文提出了一种基于新型双折射微结构光纤（MOF）的高灵敏度、大动态范围压力传感器，该光纤采用萨格纳克干涉仪结构。MOF 在包层中有两个大的半圆形孔，在中心有一个带有掺锗芯的矩形支柱。光纤结构允许周围压力在两个偏振模之间产生大的有效折射率差。在 1550nm 波长处，光纤的计算和测量群双折射分别为 1.49×10−3和 1.23×10−3。实验结果表明，该传感器的压力灵敏度在 45000pm/MPa 到 50000pm/MPa 之间变化，新型光纤传感器的最小可检测压力为 80Pa，动态范围优于 116dB。该传感器可用于恶劣环境，是井下应用的理想选择，可在高达 250°C 的高温下进行高压测量。
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