A Highly Sensitive and Low-Cost Sagnac Loop Based Pressure Sensor
A Highly Sensitive and Low-Cost Sagnac Loop Based Pressure Sensor
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DOI：
10.1109/jsen.2013.2261291
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发表时间：
2013-05
影响因子：
4.3
通讯作者：
L. Cho;Chuang Wu;Chao Lu;H. Tam
中科院分区：
文献类型：
--
作者：
L. Cho;Chuang Wu;Chao Lu;H. Tam
介绍了一种基于Sagnac环路的压力传感器，该传感器采用保偏光子晶体光纤，工作波长为850 nm，具有较大的测量范围。我们提出了一种频率和相位检测技术，与以前提出的方案相比，可以实现更大的测量范围。该方案给出了相位与压力变化之间的线性关系。实验结果与理论预测吻合较好。研究还表明，与工作在1550 nm的传感器相比，工作在850 nm的传感器提高了大约三倍的压力敏感度。它可以使用低成本、高速的电荷耦合器件询问器进行测量。
A pressure sensor based on Sagnac loop using polarization-maintaining photonic crystal fiber operating at 850 nm with much extended measuring range is experimentally demonstrated. We propose a frequency and phase detection technique to enable much extended measurement range comparing with previously proposed schemes. The scheme gives a linear relationship between phase and pressure variation. Experimental results agree well with theoretical predications. The study also shows that operating at 850 nm improves pressure sensitivity by about three times compared with sensors operating at 1550 nm. It enables the use of low-cost and high-speed charge-coupled device interrogator for measurement.