基于正交光路萨格纳克干涉仪的压力矢量传感器。

Pressure vector sensor based on an orthogonal optical path Sagnac interferometer.

作者信息

He Xuelan, Ma Chao, Wang Xianbin, Wang Zhenqiang, Yuan Libo

出版信息

Opt Express. 2020 Mar 16;28(6):7969-7979. doi: 10.1364/OE.388821.

Abstract

A novel pressure vector sensor based on a short section of PANDA fiber with an orthogonal optical path Sagnac interferometer structure is proposed and experimentally demonstrated. The sensor structure was realized using a gold film, coated on the end of the fiber tip through the magnetron sputtering method. The birefringence-dependent interference dip is sensitive to external force. Therefore, pressure can be monitored by this sensor. The relationship between the force direction and the pressure sensitivity was studied. We embedded the sensor in aluminum, using ultrasonic consolidation technology, to investigate the application of its sensing properties in metal. Based on this, the influence of the embedding direction on the polarization characteristics of the fiber was analyzed. The experimental results showed that the sensor offered a high sensitivity of 2330 pm/(N·m) in its freeform and 780 pm/(N·m) after being embedded in aluminum. Due to its simple fabrication process, low cost, and high sensitivity, the pressure sensor described in this paper could be a competitive candidate in several pressure sensing applications.

摘要

提出并通过实验证明了一种基于具有正交光路萨格纳克干涉仪结构的短段熊猫光纤的新型压力矢量传感器。该传感器结构是通过磁控溅射法在光纤尖端末端涂覆金膜实现的。与双折射相关的干涉凹陷对外力敏感。因此，该传感器可以监测压力。研究了力的方向与压力灵敏度之间的关系。我们使用超声固结技术将传感器嵌入铝中，以研究其传感特性在金属中的应用。在此基础上，分析了嵌入方向对光纤偏振特性的影响。实验结果表明，该传感器在自由状态下具有2330 pm/(N·m)的高灵敏度，嵌入铝后灵敏度为780 pm/(N·m)。由于其制造工艺简单、成本低且灵敏度高本文所述的压力传感器在多种压力传感应用中可能是一个有竞争力的候选者。