Tapered Hollow‐Core Fiber Air‐Microbubble Fabry–Perot Interferometer for High Sensitivity Strain Measurement,Advanced Materials Interfaces

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Tapered Hollow‐Core Fiber Air‐Microbubble Fabry–Perot Interferometer for High Sensitivity Strain Measurement
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-09-19 , DOI: 10.1002/admi.201800886
Yong Zhao _{1,

2} , Mao-qing Chen ₁ , Yun Peng ₁

Affiliation

A highly sensitive and ultracompact (12.5 µm) optic‐fiber strain sensor based on air‐microbubble Fabry–Perot interferometer (FPI) formed in a tapered hollow core fiber (HCF) is proposed. The sensor is fabricated by fusion splicing the lead‐in and lead‐out single‐mode fibers (SMFs) with a HCF, and then the HCF is tapered at the center to construct an air‐microbubble FPI. The application of the tapered operation not only provides an ultrasmall FPI preparation method, but also increases the strain sensitivity of the proposed FPI sensor. The simulation model is established based on the COMSOL to study the response to axial strain, and the results show that the existence of tapered area can effectively improve the strain sensitivity. Accordingly, the high strain sensitivity of 8.62 pm µε⁻¹ is achieved with a good linear response (R‐square: 0.996) in the wide strain range of 0–3200 µε, which is almost four times larger than that of the all‐fiber FPI strain sensors without the tapered area (about 2 pm µε⁻¹). In addition, the sensor has a negligible temperature sensitivity of 0.32 pm °C⁻¹. Therefore, the highly sensitive, lower temperature crosstalk, low‐cost, and ultracompact optic‐fiber strain sensor would have a broad prospect of application in practice.

更新日期：2018-09-19

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