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首页> 外文期刊>IEEE sensors journal >A Dual-Parameter Sensor Using a Long-Period Grating Concatenated With Polarization Maintaining Fiber in Sagnac Loop
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A Dual-Parameter Sensor Using a Long-Period Grating Concatenated With Polarization Maintaining Fiber in Sagnac Loop

机译：Sagnac回路中使用长周期光栅和保偏光纤的双参数传感器

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摘要

In this paper, a novel dual-parameter measurement scheme using a long-period grating (LPG) concatenated with polarization maintaining fiber (PMF) in a Sagnac loop was proposed and experimentally demonstrated to measure temperature and refractive index (RI) simultaneously. There are two types of dips in the output spectrum of the proposed sensor, which are formed by the LPG and Sagnac loop. Compared with the traditional Sagnac loop sensors using PMF only, the birefringence induced by the LPG changes the phase difference and makes the dips of the Sagnac loop sensitive to surrounding RI. Due to different interference mechanisms, the dual-parameter measurement is realized by Sagnac loop and LPG with different sensitivities to temperature and RI. Experiments show that in the output spectrum of the sensor, the dip of the LPG has the sensitivities of 0.201 nm/°C and −8.36 nm/RIU, and the dip of the Sagnac loop has the sensitivities of −1.06 nm/°C and −23.068 nm/RIU. The proposed sensor has a simple structure and great potential in biological, chemical, and ocean fields.
机译：本文提出了一种新的双参数测量方案，该方案采用在Sagnac环路中与偏振保持光纤（PMF）串联的长周期光栅（LPG）并通过实验证明了可以同时测量温度和折射率（RI）。所提出的传感器的输出频谱中存在两种类型的骤降，它们是由LPG和Sagnac回路形成的。与仅使用PMF的传统Sagnac回路传感器相比，LPG引起的双折射会改变相位差，并使Sagnac回路的倾角对周围的RI敏感。由于不同的干扰机制，双参数测量是通过Sagnac回路和LPG对温度和RI的敏感性不同来实现的。实验表明，在传感器的输出光谱中，LPG的倾角的灵敏度为0.201 nm /°C和-8.36 nm / RIU，而Sagnac环路的倾角的灵敏度为-1.06 nm /°C和-23.068 nm / RIU。提出的传感器结构简单，在生物，化学和海洋领域具有巨大的潜力。

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