研究目的
To propose and demonstrate a highly sensitive and compact fiber-optic vector bending sensor for curvature measurement with direction-dependent capabilities and low temperature cross-sensitivity.
研究成果
The proposed MAMZI-based sensor is highly sensitive, compact, and cost-effective for vector bending sensing with low temperature cross-sensitivity, making it suitable for in-situ applications in fields like mechanical engineering and aerospace.
研究不足
The sensor is limited to micro-bending measurements up to 3.0 m-1 curvature; initial rotational angle precision and slight changes in microfiber length during bending may affect accuracy; applicability in harsh environments not tested.
1：Experimental Design and Method Selection:
The sensor is based on a microfiber-assisted Mach-Zehnder interferometer (MAMZI) fabricated using flame scanning technique and splicing with lateral offset to break circular symmetry for vector bending sensing. Theoretical analysis includes optical interference and refractive index changes due to bending.
2：Sample Selection and Data Sources:
A segment of microfiber tapered from standard single-mode fibers (SMFs) with specific length and diameter is used.
3：List of Experimental Equipment and Materials:
Broadband source (BBS), optical spectrum analyzer (OSA: Yokogawa AQ6370C), fiber splicer (Fujikura FSM-60s), micro-displacement stages (MSs) with rotators, SMFs, microfiber.
4：Experimental Procedures and Operational Workflow:
Fabricate microfiber using flame scanning, splice with lateral offset between SMFs, set up bending test system with BBS, OSA, and MSs to apply curvature and measure spectral shifts for different directions and temperatures.
5：Data Analysis Methods:
Linear fitting of wavelength shifts vs. curvature, sinusoidal fitting of sensitivity vs. angle, and calculation of temperature sensitivity.
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fiber splicer
FSM-60s
Fujikura
Used for splicing the microfiber with standard single-mode fibers with lateral offset.
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optical spectrum analyzer
AQ6370C
Yokogawa
Used to measure the transmission spectra with a spectral resolution of 0.1 nm.
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broadband source
Provides broadband light output from 1250 nm to 1640 nm for the sensing system.
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micro-displacement stage
Used to apply and control curvature with a displacement resolution of 10 μm.
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