研究目的
Investigating the enhancement mechanism of the initial twist rate on the sensitivity of a torsion sensor based on liquid-filled twisted photonic crystal fibers.
研究成果
The study demonstrates a method to prepare a new sensor with high torsion sensitivity, achieving an optimal torsion sensitivity of ~446 nm·mm·rad?1. The helical PCF with an embedded waveguide can be a valuable torsion sensor.
研究不足
The study focuses on the response mechanism of the torsion sensitivity to initial twisting rate and the refractive index of the filled liquid, but larger rotation angles have yet to be applied to avoid damaging the fiber in the torsion test.
1：Experimental Design and Method Selection:
The study combines a twisted photonic crystal fiber with a liquid-filled waveguide in its air-hole cladding to construct a torsion sensor. The torsion sensitivity is determined by the phase-matching conditions between the fiber core mode and the liquid waveguide mode, which can be improved by tuning the helicity (initial twist rate, α0).
2：0). Sample Selection and Data Sources:
2. Sample Selection and Data Sources: A series of LFTPCFs with different initial twisting rates and refractive indices of filled liquid are prepared to study the tunability of their torsion sensitivity.
3：List of Experimental Equipment and Materials:
The PCF investigated is ESM-12 (NKT Photonics), with standard refractive index (RI) liquid (Cargille Lab, Inc., Cedar Grove, NJ, USA) at around 1.
4：Experimental Procedures and Operational Workflow:
484. 4. Experimental Procedures and Operational Workflow: The proposed fiber sensors are fabricated in two steps: inducing a permanent helical structured PCF by twisting and translating the normal PCF under an oxyhydrogen flame heating process, and then filling one of the air holes with standard RI liquid via a femtosecond-laser-assisted method.
5：Data Analysis Methods:
The torsion sensitivity ST is obtained by fitting the relation curve between α and the wavelength shift Δλ.
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optical spectrum analyzer (OSA)
AQ6370C
Yokogawa
Used to measure the transmission spectra in the torsion test system.
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ESM-12
NKT Photonics
The PCF investigated in this work, used for constructing the torsion sensor.
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standard refractive index (RI) liquid
Cargille Lab, Inc.
Used to fill the air holes in the PCF cladding to create embedded satellite waveguides.
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broad band ASE light source
FL-ASE
FiberLake
Used as a light source in the torsion test system.
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