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Practical research on photonic crystal fiber micro-strain sensor

机译：光子晶体光纤微应变传感器的实践研究

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摘要

In this paper, we study the principle and application of a micro-strain sensor with a single mode fiber - tapered photonic crystal fiber - single mode fiber (SMF-TPCF-SMF) structure. The fabrication process and sensing principle of strain sensor are introduced in detail, and the key problems in the application process are solved. A kind of intermittent cooling tapering technique is proposed, which can obtain high quality interference spectrum. We verified that tapering the photonic crystal fiber in the sensor could effectively improve the sensitivity of the sensor. Experimental results showed that the strain sensitivity of the sensor before tapering is 2.75pm/mu epsilon, and its linear fit is 98.35%; after tapering, the strain sensitivity of the sensor is 5.46pm/mu epsilon, and its linear fit is 98.59% when the strain range is 109.860 - 559.287 mu epsilon. The improved strain sensor with an SMF-TPCF-SMF structure has high sensitivity, good stability, quick response speed, good invertibility, simple manufacturing process, and low cost. Thus, it has broad application value.
机译：在本文中，我们研究了具有单模光纤-锥形光子晶体光纤-单模光纤（SMF-TPCF-SMF）结构的微应变传感器的原理和应用。详细介绍了应变传感器的制造工艺和传感原理，解决了应用过程中的关键问题。提出了一种能获得高质量干涉谱的间歇冷却锥度技术。我们验证了使传感器中的光子晶体光纤逐渐变细可以有效地提高传感器的灵敏度。实验结果表明，传感器在变细前的应变灵敏度为2.75pm / mu epsilon，线性拟合度为98.35％。逐渐变细后，传感器的应变灵敏度为5.46pm / mu epsilon，当应变范围为109.860-559.287 mu epsilon时，其线性拟合度为98.59％。具有SMF-TPCF-SMF结构的改进的应变传感器具有高灵敏度，良好的稳定性，快速的响应速度，良好的可逆性，简单的制造工艺以及低成本。因此，具有广泛的应用价值。

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